Vb.net 参数化非重复密钥上的Linq连接
我正在尝试基于动态键LINQ两个表。用户可以通过组合框更改键。键可以是money、string、double、int等。目前我得到的数据很好，但没有过滤掉double。我可以在VB中过滤双精度，但它很慢。我想在大门外的LINQ查询中这样做 以下是数据： 第一张表：Vb.net 参数化非重复密钥上的Linq连接,vb.net,linq,sorting,merge,distinct-values,Vb.net,Linq,Sorting,Merge,Distinct Values,我正在尝试基于动态键LINQ两个表。用户可以通过组合框更改键。键可以是money、string、double、int等。目前我得到的数据很好，但没有过滤掉double。我可以在VB中过滤双精度，但它很慢。我想在大门外的LINQ查询中这样做 以下是数据： 第一张表： ------------------------------------------------------------- | AppleIndex | AppleCost | AppleColor | AppleDescri
-------------------------------------------------------------
| AppleIndex | AppleCost | AppleColor | AppleDescription |
------------------------------------------------------------
| 1 | 3 | Red | This is an apple |
| 2 | 5 | Green | This is an apple |
| 3 | 4 | Pink | This is an apple |
| 4 | 2 | Yellow | This is an apple |
| 5 | 2 | Orange | This is an apple |
| 1 | 3 | Red | This is a duplicate|
| 2 | 5 | Green | This is a duplicate|
| 3 | 4 | Pink | This is a duplicate|
| 4 | 2 | Yellow | This is a duplicate|
| 5 | 2 | Orange | This is a duplicate|
-------------------------------------------------------------
------------------------------------------------------------
| OrangeIndex | OrangeCost | OrangeColor | OrangeDescription |
------------------------------------------------------------
| 1 | 1 | Orange | This is an Orange |
| 2 | 3 | Orange | |
| 3 | 2 | Orange | This is an Orange |
| 4 | 3 | Orange | |
| 5 | 2 | Orange | This is an Orange |
------------------------------------------------------------
Dim Matches = From mRows In LinqMasterTable Join sRows In LinqSecondTable _
On mRows(ThePrimaryKey) Equals sRows(TheForignKey) _
Order By mRows(ThePrimaryKey) _
Select mRows, sRows Distinct
-------------------------------------------------------------------------
| 1 | 3 | Red | This is an apple | 1 | Orange | This is an Orange |
| 1 | 3 | Red | This is an duplicate | 1 | Orange | This is an Orange |
| 2 | 5 | Green | This is an apple | 3 | Orange | |
| 2 | 5 | Green | This is an duplicate | 3 | Orange | |
| 3 | 4 | Pink | This is an apple | 2 | Orange | This is an Orange |
| 3 | 4 | Pink | This is an duplicate | 2 | Orange | This is an Orange |
| 4 | 2 | Yellow | This is an apple | 3 | Orange | |
| 4 | 2 | Yellow | This is an duplicate | 3 | Orange | |
| 5 | 2 | Orange | This is an apple | 2 | Orange | This is an Orange |
| 5 | 2 | Orange | This is an duplicate | 2 | Orange | This is an Orange |
-------------------------------------------------------------------------
------------------------------------------------------------------------
| 1 | 3 | Red | This is an apple | 1 | 1 | Orange | This is an Orange |
| 2 | 5 | Green | This is an apple | 2 | 3 | Orange | |
| 3 | 4 | Pink | This is an apple | 3 | 2 | Orange | This is an Orange |
| 4 | 2 | Yellow | This is an apple | 4 | 3 | Orange | |
| 5 | 2 | Orange | This is an apple | 5 | 2 | Orange | This is an Orange |
------------------------------------------------------------------------
'Get the original Column Names into an Array List
'MasterTableColumns = GetColumns(qMasterDS, TheMasterTable) '(external code)
'Plug the Existing DataSet into a DataView:
Dim View As DataView = New DataView(qMasterTable)
'Sort by the Primary Key:
View.Sort = ThePrimaryKey
'Build a new table listing only one column:
Dim newListTable As DataTable = _
View.ToTable("UniqueData", True, ThePrimaryKey)
-------------
| AppleIndex |
-------------
| 1 |
| 2 |
| 3 |
| 4 |
| 5 |
-------------
'Build a new table with ALL the columns:
Dim newFullTable As DataTable = _
View.ToTable("UniqueData", True, _
MasterTableColumns(0), _
MasterTableColumns(1), _
MasterTableColumns(2), _
MasterTableColumns(3))
-------------------------------------------------------------
| AppleIndex | AppleCost | AppleColor | AppleDescription |
------------------------------------------------------------
| 1 | 3 | Red | This is an apple |
| 2 | 5 | Green | This is an apple |
| 3 | 4 | Pink | This is an apple |
| 4 | 2 | Yellow | This is an apple |
| 5 | 2 | Orange | This is an apple |
| 1 | 3 | Red | This is a duplicate|
| 2 | 5 | Green | This is a duplicate|
| 3 | 4 | Pink | This is a duplicate|
| 4 | 2 | Yellow | This is a duplicate|
| 5 | 2 | Orange | This is a duplicate|
-------------------------------------------------------------
Private Sub LinqTwoTableInnerJoin(ByRef qMasterDS As DataSet, _
ByRef qMasterTable As DataTable, _
ByRef qSecondDS As DataSet, _
ByRef qSecondTable As DataTable, _
ByRef qPrimaryKey As String, _
ByRef qForignKey As String, _
ByVal qResultsName As String)
Dim TheMasterTable As String = qMasterTable.TableName
Dim TheSecondTable As String = qSecondTable.TableName
Dim ThePrimaryKey As String = qPrimaryKey
Dim TheForignKey As String = qForignKey
Dim TheNewForignKey As String = ""
MasterTableColumns = GetColumns(qMasterDS, TheMasterTable)
SecondTableColumns = GetColumns(qSecondDS, TheSecondTable)
Dim mColumnCount As Integer = MasterTableColumns.Count
Dim sColumnCount As Integer = SecondTableColumns.Count
Dim ColumnCount As Integer = mColumnCount + sColumnCount
Dim LinqMasterTable = qMasterDS.Tables(TheMasterTable).AsEnumerable
Dim LinqSecondTable = qSecondDS.Tables(TheSecondTable).AsEnumerable
Dim Matches = From mRows In LinqMasterTable Join sRows In LinqSecondTable _
On mRows(ThePrimaryKey) Equals sRows(TheForignKey) _
Order By mRows(ThePrimaryKey) _
Select mRows, sRows
' Make sure the dataset is available and/or cleared:
If dsResults.Tables(qResultsName) Is Nothing Then dsResults.Tables.Add(qResultsName)
dsResults.Tables(qResultsName).Clear() : dsResults.Tables(qResultsName).Columns.Clear()
'Adds Master Table Column Names
For x = 0 To MasterTableColumns.Count - 1
dsResults.Tables(qResultsName).Columns.Add(MasterTableColumns(x))
Next
'Rename Second Table Names if Needed:
For x = 0 To SecondTableColumns.Count - 1
With dsResults.Tables(qResultsName)
For y = 0 To .Columns.Count - 1
If SecondTableColumns(x) = .Columns(y).ColumnName Then
SecondTableColumns(x) = SecondTableColumns(x) & "_2"
End If
Next
End With
Next
'Make sure that the Forign Key is a Unique Value
If ForignKey1 = PrimaryKey Then
TheNewForignKey = ForignKey1 & "_2"
Else
TheNewForignKey = ForignKey1
End If
'Adds Second Table Column Names
For x = 0 To SecondTableColumns.Count - 1
dsResults.Tables(qResultsName).Columns.Add(SecondTableColumns(x))
Next
'Copy Results into the Dataset:
For Each Match In Matches
'Build an array for each row:
Dim NewRow(ColumnCount - 1) As Object
'Add the mRow Items:
For x = 0 To MasterTableColumns.Count - 1
NewRow(x) = Match.mRows.Item(x)
Next
'Add the srow Items:
For x = 0 To SecondTableColumns.Count - 1
Dim y As Integer = x + (MasterTableColumns.Count)
NewRow(y) = Match.sRows.Item(x)
Next
'Add the array to dsResults as a Row:
dsResults.Tables(qResultsName).Rows.Add(NewRow)
Next
If chkUnique.Checked = True Then
ReMoveDuplicates(dsResults.Tables(qResultsName), ThePrimaryKey)
End If
Private Sub ReMoveDuplicates(ByRef SkipTable As DataTable, _
ByRef TableKey As String)
'Make sure that there's data to work with:
If SkipTable Is Nothing Then Exit Sub
If TableKey Is Nothing Then Exit Sub
'Create an ArrayList of rows to delete:
Dim DeleteRows As New ArrayList()
'Fill the Array with Row Number of the items equal
'to the item above them:
For x = 1 To SkipTable.Rows.Count - 1
Dim RowOne As DataRow = SkipTable.Rows(x - 1)
Dim RowTwo As DataRow = SkipTable.Rows(x)
If RowTwo.Item(TableKey) = RowOne.Item(TableKey) Then
DeleteRows.Add(x)
End If
Next
'If there are no hits, exit this sub:
If DeleteRows.Count < 1 Or DeleteRows Is Nothing Then
Exit Sub
End If
'Otherwise, remove the rows based on the row count value:
For x = 0 To DeleteRows.Count - 1
'Start at the END and count backwards so the duplicate
'item's row count value doesn't change with each deleted row
Dim KillRow As Integer = DeleteRows((DeleteRows.Count - 1) - x)
'Delete the row:
SkipTable.Rows(KillRow).Delete()
Next
End Sub
If Not chkRetainKeys.Checked = True Then 'Removes Forign Key
dsResults.Tables(qResultsName).Columns.Remove(TheNewForignKey)
End If
'Clear Arrays
MasterTableColumns.Clear()
SecondTableColumns.Clear()
-------------------------------------------------------------
| AppleIndex | AppleCost | AppleColor | AppleDescription |
------------------------------------------------------------
| 1 | 3 | Red | This is an apple |
| 2 | 5 | Green | This is an apple |
| 3 | 4 | Pink | This is an apple |
| 4 | 2 | Yellow | This is an apple |
| 5 | 2 | Orange | This is an apple |
| 1 | 3 | Red | This is a duplicate|
| 2 | 5 | Green | This is a duplicate|
| 3 | 4 | Pink | This is a duplicate|
| 4 | 2 | Yellow | This is a duplicate|
| 5 | 2 | Orange | This is a duplicate|
-------------------------------------------------------------
------------------------------------------------------------
| OrangeIndex | OrangeCost | OrangeColor | OrangeDescription |
------------------------------------------------------------
| 1 | 1 | Orange | This is an Orange |
| 2 | 3 | Orange | |
| 3 | 2 | Orange | This is an Orange |
| 4 | 3 | Orange | |
| 5 | 2 | Orange | This is an Orange |
------------------------------------------------------------
Dim Matches = From mRows In LinqMasterTable Join sRows In LinqSecondTable _
On mRows(ThePrimaryKey) Equals sRows(TheForignKey) _
Order By mRows(ThePrimaryKey) _
Select mRows, sRows Distinct
-------------------------------------------------------------------------
| 1 | 3 | Red | This is an apple | 1 | Orange | This is an Orange |
| 1 | 3 | Red | This is an duplicate | 1 | Orange | This is an Orange |
| 2 | 5 | Green | This is an apple | 3 | Orange | |
| 2 | 5 | Green | This is an duplicate | 3 | Orange | |
| 3 | 4 | Pink | This is an apple | 2 | Orange | This is an Orange |
| 3 | 4 | Pink | This is an duplicate | 2 | Orange | This is an Orange |
| 4 | 2 | Yellow | This is an apple | 3 | Orange | |
| 4 | 2 | Yellow | This is an duplicate | 3 | Orange | |
| 5 | 2 | Orange | This is an apple | 2 | Orange | This is an Orange |
| 5 | 2 | Orange | This is an duplicate | 2 | Orange | This is an Orange |
-------------------------------------------------------------------------
------------------------------------------------------------------------
| 1 | 3 | Red | This is an apple | 1 | 1 | Orange | This is an Orange |
| 2 | 5 | Green | This is an apple | 2 | 3 | Orange | |
| 3 | 4 | Pink | This is an apple | 3 | 2 | Orange | This is an Orange |
| 4 | 2 | Yellow | This is an apple | 4 | 3 | Orange | |
| 5 | 2 | Orange | This is an apple | 5 | 2 | Orange | This is an Orange |
------------------------------------------------------------------------
'Get the original Column Names into an Array List
'MasterTableColumns = GetColumns(qMasterDS, TheMasterTable) '(external code)
'Plug the Existing DataSet into a DataView:
Dim View As DataView = New DataView(qMasterTable)
'Sort by the Primary Key:
View.Sort = ThePrimaryKey
'Build a new table listing only one column:
Dim newListTable As DataTable = _
View.ToTable("UniqueData", True, ThePrimaryKey)
-------------
| AppleIndex |
-------------
| 1 |
| 2 |
| 3 |
| 4 |
| 5 |
-------------
'Build a new table with ALL the columns:
Dim newFullTable As DataTable = _
View.ToTable("UniqueData", True, _
MasterTableColumns(0), _
MasterTableColumns(1), _
MasterTableColumns(2), _
MasterTableColumns(3))
-------------------------------------------------------------
| AppleIndex | AppleCost | AppleColor | AppleDescription |
------------------------------------------------------------
| 1 | 3 | Red | This is an apple |
| 2 | 5 | Green | This is an apple |
| 3 | 4 | Pink | This is an apple |
| 4 | 2 | Yellow | This is an apple |
| 5 | 2 | Orange | This is an apple |
| 1 | 3 | Red | This is a duplicate|
| 2 | 5 | Green | This is a duplicate|
| 3 | 4 | Pink | This is a duplicate|
| 4 | 2 | Yellow | This is a duplicate|
| 5 | 2 | Orange | This is a duplicate|
-------------------------------------------------------------
Private Sub LinqTwoTableInnerJoin(ByRef qMasterDS As DataSet, _
ByRef qMasterTable As DataTable, _
ByRef qSecondDS As DataSet, _
ByRef qSecondTable As DataTable, _
ByRef qPrimaryKey As String, _
ByRef qForignKey As String, _
ByVal qResultsName As String)
Dim TheMasterTable As String = qMasterTable.TableName
Dim TheSecondTable As String = qSecondTable.TableName
Dim ThePrimaryKey As String = qPrimaryKey
Dim TheForignKey As String = qForignKey
Dim TheNewForignKey As String = ""
MasterTableColumns = GetColumns(qMasterDS, TheMasterTable)
SecondTableColumns = GetColumns(qSecondDS, TheSecondTable)
Dim mColumnCount As Integer = MasterTableColumns.Count
Dim sColumnCount As Integer = SecondTableColumns.Count
Dim ColumnCount As Integer = mColumnCount + sColumnCount
Dim LinqMasterTable = qMasterDS.Tables(TheMasterTable).AsEnumerable
Dim LinqSecondTable = qSecondDS.Tables(TheSecondTable).AsEnumerable
Dim Matches = From mRows In LinqMasterTable Join sRows In LinqSecondTable _
On mRows(ThePrimaryKey) Equals sRows(TheForignKey) _
Order By mRows(ThePrimaryKey) _
Select mRows, sRows
' Make sure the dataset is available and/or cleared:
If dsResults.Tables(qResultsName) Is Nothing Then dsResults.Tables.Add(qResultsName)
dsResults.Tables(qResultsName).Clear() : dsResults.Tables(qResultsName).Columns.Clear()
'Adds Master Table Column Names
For x = 0 To MasterTableColumns.Count - 1
dsResults.Tables(qResultsName).Columns.Add(MasterTableColumns(x))
Next
'Rename Second Table Names if Needed:
For x = 0 To SecondTableColumns.Count - 1
With dsResults.Tables(qResultsName)
For y = 0 To .Columns.Count - 1
If SecondTableColumns(x) = .Columns(y).ColumnName Then
SecondTableColumns(x) = SecondTableColumns(x) & "_2"
End If
Next
End With
Next
'Make sure that the Forign Key is a Unique Value
If ForignKey1 = PrimaryKey Then
TheNewForignKey = ForignKey1 & "_2"
Else
TheNewForignKey = ForignKey1
End If
'Adds Second Table Column Names
For x = 0 To SecondTableColumns.Count - 1
dsResults.Tables(qResultsName).Columns.Add(SecondTableColumns(x))
Next
'Copy Results into the Dataset:
For Each Match In Matches
'Build an array for each row:
Dim NewRow(ColumnCount - 1) As Object
'Add the mRow Items:
For x = 0 To MasterTableColumns.Count - 1
NewRow(x) = Match.mRows.Item(x)
Next
'Add the srow Items:
For x = 0 To SecondTableColumns.Count - 1
Dim y As Integer = x + (MasterTableColumns.Count)
NewRow(y) = Match.sRows.Item(x)
Next
'Add the array to dsResults as a Row:
dsResults.Tables(qResultsName).Rows.Add(NewRow)
Next
If chkUnique.Checked = True Then
ReMoveDuplicates(dsResults.Tables(qResultsName), ThePrimaryKey)
End If
Private Sub ReMoveDuplicates(ByRef SkipTable As DataTable, _
ByRef TableKey As String)
'Make sure that there's data to work with:
If SkipTable Is Nothing Then Exit Sub
If TableKey Is Nothing Then Exit Sub
'Create an ArrayList of rows to delete:
Dim DeleteRows As New ArrayList()
'Fill the Array with Row Number of the items equal
'to the item above them:
For x = 1 To SkipTable.Rows.Count - 1
Dim RowOne As DataRow = SkipTable.Rows(x - 1)
Dim RowTwo As DataRow = SkipTable.Rows(x)
If RowTwo.Item(TableKey) = RowOne.Item(TableKey) Then
DeleteRows.Add(x)
End If
Next
'If there are no hits, exit this sub:
If DeleteRows.Count < 1 Or DeleteRows Is Nothing Then
Exit Sub
End If
'Otherwise, remove the rows based on the row count value:
For x = 0 To DeleteRows.Count - 1
'Start at the END and count backwards so the duplicate
'item's row count value doesn't change with each deleted row
Dim KillRow As Integer = DeleteRows((DeleteRows.Count - 1) - x)
'Delete the row:
SkipTable.Rows(KillRow).Delete()
Next
End Sub
If Not chkRetainKeys.Checked = True Then 'Removes Forign Key
dsResults.Tables(qResultsName).Columns.Remove(TheNewForignKey)
End If
'Clear Arrays
MasterTableColumns.Clear()
SecondTableColumns.Clear()
-------------------------------------------------------------
| AppleIndex | AppleCost | AppleColor | AppleDescription |
------------------------------------------------------------
| 1 | 3 | Red | This is an apple |
| 2 | 5 | Green | This is an apple |
| 3 | 4 | Pink | This is an apple |
| 4 | 2 | Yellow | This is an apple |
| 5 | 2 | Orange | This is an apple |
| 1 | 3 | Red | This is a duplicate|
| 2 | 5 | Green | This is a duplicate|
| 3 | 4 | Pink | This is a duplicate|
| 4 | 2 | Yellow | This is a duplicate|
| 5 | 2 | Orange | This is a duplicate|
-------------------------------------------------------------
------------------------------------------------------------
| OrangeIndex | OrangeCost | OrangeColor | OrangeDescription |
------------------------------------------------------------
| 1 | 1 | Orange | This is an Orange |
| 2 | 3 | Orange | |
| 3 | 2 | Orange | This is an Orange |
| 4 | 3 | Orange | |
| 5 | 2 | Orange | This is an Orange |
------------------------------------------------------------
Dim Matches = From mRows In LinqMasterTable Join sRows In LinqSecondTable _
On mRows(ThePrimaryKey) Equals sRows(TheForignKey) _
Order By mRows(ThePrimaryKey) _
Select mRows, sRows Distinct
-------------------------------------------------------------------------
| 1 | 3 | Red | This is an apple | 1 | Orange | This is an Orange |
| 1 | 3 | Red | This is an duplicate | 1 | Orange | This is an Orange |
| 2 | 5 | Green | This is an apple | 3 | Orange | |
| 2 | 5 | Green | This is an duplicate | 3 | Orange | |
| 3 | 4 | Pink | This is an apple | 2 | Orange | This is an Orange |
| 3 | 4 | Pink | This is an duplicate | 2 | Orange | This is an Orange |
| 4 | 2 | Yellow | This is an apple | 3 | Orange | |
| 4 | 2 | Yellow | This is an duplicate | 3 | Orange | |
| 5 | 2 | Orange | This is an apple | 2 | Orange | This is an Orange |
| 5 | 2 | Orange | This is an duplicate | 2 | Orange | This is an Orange |
-------------------------------------------------------------------------
------------------------------------------------------------------------
| 1 | 3 | Red | This is an apple | 1 | 1 | Orange | This is an Orange |
| 2 | 5 | Green | This is an apple | 2 | 3 | Orange | |
| 3 | 4 | Pink | This is an apple | 3 | 2 | Orange | This is an Orange |
| 4 | 2 | Yellow | This is an apple | 4 | 3 | Orange | |
| 5 | 2 | Orange | This is an apple | 5 | 2 | Orange | This is an Orange |
------------------------------------------------------------------------
'Get the original Column Names into an Array List
'MasterTableColumns = GetColumns(qMasterDS, TheMasterTable) '(external code)
'Plug the Existing DataSet into a DataView:
Dim View As DataView = New DataView(qMasterTable)
'Sort by the Primary Key:
View.Sort = ThePrimaryKey
'Build a new table listing only one column:
Dim newListTable As DataTable = _
View.ToTable("UniqueData", True, ThePrimaryKey)
-------------
| AppleIndex |
-------------
| 1 |
| 2 |
| 3 |
| 4 |
| 5 |
-------------
'Build a new table with ALL the columns:
Dim newFullTable As DataTable = _
View.ToTable("UniqueData", True, _
MasterTableColumns(0), _
MasterTableColumns(1), _
MasterTableColumns(2), _
MasterTableColumns(3))
-------------------------------------------------------------
| AppleIndex | AppleCost | AppleColor | AppleDescription |
------------------------------------------------------------
| 1 | 3 | Red | This is an apple |
| 2 | 5 | Green | This is an apple |
| 3 | 4 | Pink | This is an apple |
| 4 | 2 | Yellow | This is an apple |
| 5 | 2 | Orange | This is an apple |
| 1 | 3 | Red | This is a duplicate|
| 2 | 5 | Green | This is a duplicate|
| 3 | 4 | Pink | This is a duplicate|
| 4 | 2 | Yellow | This is a duplicate|
| 5 | 2 | Orange | This is a duplicate|
-------------------------------------------------------------
Private Sub LinqTwoTableInnerJoin(ByRef qMasterDS As DataSet, _
ByRef qMasterTable As DataTable, _
ByRef qSecondDS As DataSet, _
ByRef qSecondTable As DataTable, _
ByRef qPrimaryKey As String, _
ByRef qForignKey As String, _
ByVal qResultsName As String)
Dim TheMasterTable As String = qMasterTable.TableName
Dim TheSecondTable As String = qSecondTable.TableName
Dim ThePrimaryKey As String = qPrimaryKey
Dim TheForignKey As String = qForignKey
Dim TheNewForignKey As String = ""
MasterTableColumns = GetColumns(qMasterDS, TheMasterTable)
SecondTableColumns = GetColumns(qSecondDS, TheSecondTable)
Dim mColumnCount As Integer = MasterTableColumns.Count
Dim sColumnCount As Integer = SecondTableColumns.Count
Dim ColumnCount As Integer = mColumnCount + sColumnCount
Dim LinqMasterTable = qMasterDS.Tables(TheMasterTable).AsEnumerable
Dim LinqSecondTable = qSecondDS.Tables(TheSecondTable).AsEnumerable
Dim Matches = From mRows In LinqMasterTable Join sRows In LinqSecondTable _
On mRows(ThePrimaryKey) Equals sRows(TheForignKey) _
Order By mRows(ThePrimaryKey) _
Select mRows, sRows
' Make sure the dataset is available and/or cleared:
If dsResults.Tables(qResultsName) Is Nothing Then dsResults.Tables.Add(qResultsName)
dsResults.Tables(qResultsName).Clear() : dsResults.Tables(qResultsName).Columns.Clear()
'Adds Master Table Column Names
For x = 0 To MasterTableColumns.Count - 1
dsResults.Tables(qResultsName).Columns.Add(MasterTableColumns(x))
Next
'Rename Second Table Names if Needed:
For x = 0 To SecondTableColumns.Count - 1
With dsResults.Tables(qResultsName)
For y = 0 To .Columns.Count - 1
If SecondTableColumns(x) = .Columns(y).ColumnName Then
SecondTableColumns(x) = SecondTableColumns(x) & "_2"
End If
Next
End With
Next
'Make sure that the Forign Key is a Unique Value
If ForignKey1 = PrimaryKey Then
TheNewForignKey = ForignKey1 & "_2"
Else
TheNewForignKey = ForignKey1
End If
'Adds Second Table Column Names
For x = 0 To SecondTableColumns.Count - 1
dsResults.Tables(qResultsName).Columns.Add(SecondTableColumns(x))
Next
'Copy Results into the Dataset:
For Each Match In Matches
'Build an array for each row:
Dim NewRow(ColumnCount - 1) As Object
'Add the mRow Items:
For x = 0 To MasterTableColumns.Count - 1
NewRow(x) = Match.mRows.Item(x)
Next
'Add the srow Items:
For x = 0 To SecondTableColumns.Count - 1
Dim y As Integer = x + (MasterTableColumns.Count)
NewRow(y) = Match.sRows.Item(x)
Next
'Add the array to dsResults as a Row:
dsResults.Tables(qResultsName).Rows.Add(NewRow)
Next
If chkUnique.Checked = True Then
ReMoveDuplicates(dsResults.Tables(qResultsName), ThePrimaryKey)
End If
Private Sub ReMoveDuplicates(ByRef SkipTable As DataTable, _
ByRef TableKey As String)
'Make sure that there's data to work with:
If SkipTable Is Nothing Then Exit Sub
If TableKey Is Nothing Then Exit Sub
'Create an ArrayList of rows to delete:
Dim DeleteRows As New ArrayList()
'Fill the Array with Row Number of the items equal
'to the item above them:
For x = 1 To SkipTable.Rows.Count - 1
Dim RowOne As DataRow = SkipTable.Rows(x - 1)
Dim RowTwo As DataRow = SkipTable.Rows(x)
If RowTwo.Item(TableKey) = RowOne.Item(TableKey) Then
DeleteRows.Add(x)
End If
Next
'If there are no hits, exit this sub:
If DeleteRows.Count < 1 Or DeleteRows Is Nothing Then
Exit Sub
End If
'Otherwise, remove the rows based on the row count value:
For x = 0 To DeleteRows.Count - 1
'Start at the END and count backwards so the duplicate
'item's row count value doesn't change with each deleted row
Dim KillRow As Integer = DeleteRows((DeleteRows.Count - 1) - x)
'Delete the row:
SkipTable.Rows(KillRow).Delete()
Next
End Sub
If Not chkRetainKeys.Checked = True Then 'Removes Forign Key
dsResults.Tables(qResultsName).Columns.Remove(TheNewForignKey)
End If
'Clear Arrays
MasterTableColumns.Clear()
SecondTableColumns.Clear()
-------------------------------------------------------------
| AppleIndex | AppleCost | AppleColor | AppleDescription |
------------------------------------------------------------
| 1 | 3 | Red | This is an apple |
| 2 | 5 | Green | This is an apple |
| 3 | 4 | Pink | This is an apple |
| 4 | 2 | Yellow | This is an apple |
| 5 | 2 | Orange | This is an apple |
| 1 | 3 | Red | This is a duplicate|
| 2 | 5 | Green | This is a duplicate|
| 3 | 4 | Pink | This is a duplicate|
| 4 | 2 | Yellow | This is a duplicate|
| 5 | 2 | Orange | This is a duplicate|
-------------------------------------------------------------
------------------------------------------------------------
| OrangeIndex | OrangeCost | OrangeColor | OrangeDescription |
------------------------------------------------------------
| 1 | 1 | Orange | This is an Orange |
| 2 | 3 | Orange | |
| 3 | 2 | Orange | This is an Orange |
| 4 | 3 | Orange | |
| 5 | 2 | Orange | This is an Orange |
------------------------------------------------------------
Dim Matches = From mRows In LinqMasterTable Join sRows In LinqSecondTable _
On mRows(ThePrimaryKey) Equals sRows(TheForignKey) _
Order By mRows(ThePrimaryKey) _
Select mRows, sRows Distinct
-------------------------------------------------------------------------
| 1 | 3 | Red | This is an apple | 1 | Orange | This is an Orange |
| 1 | 3 | Red | This is an duplicate | 1 | Orange | This is an Orange |
| 2 | 5 | Green | This is an apple | 3 | Orange | |
| 2 | 5 | Green | This is an duplicate | 3 | Orange | |
| 3 | 4 | Pink | This is an apple | 2 | Orange | This is an Orange |
| 3 | 4 | Pink | This is an duplicate | 2 | Orange | This is an Orange |
| 4 | 2 | Yellow | This is an apple | 3 | Orange | |
| 4 | 2 | Yellow | This is an duplicate | 3 | Orange | |
| 5 | 2 | Orange | This is an apple | 2 | Orange | This is an Orange |
| 5 | 2 | Orange | This is an duplicate | 2 | Orange | This is an Orange |
-------------------------------------------------------------------------
------------------------------------------------------------------------
| 1 | 3 | Red | This is an apple | 1 | 1 | Orange | This is an Orange |
| 2 | 5 | Green | This is an apple | 2 | 3 | Orange | |
| 3 | 4 | Pink | This is an apple | 3 | 2 | Orange | This is an Orange |
| 4 | 2 | Yellow | This is an apple | 4 | 3 | Orange | |
| 5 | 2 | Orange | This is an apple | 5 | 2 | Orange | This is an Orange |
------------------------------------------------------------------------
'Get the original Column Names into an Array List
'MasterTableColumns = GetColumns(qMasterDS, TheMasterTable) '(external code)
'Plug the Existing DataSet into a DataView:
Dim View As DataView = New DataView(qMasterTable)
'Sort by the Primary Key:
View.Sort = ThePrimaryKey
'Build a new table listing only one column:
Dim newListTable As DataTable = _
View.ToTable("UniqueData", True, ThePrimaryKey)
-------------
| AppleIndex |
-------------
| 1 |
| 2 |
| 3 |
| 4 |
| 5 |
-------------
'Build a new table with ALL the columns:
Dim newFullTable As DataTable = _
View.ToTable("UniqueData", True, _
MasterTableColumns(0), _
MasterTableColumns(1), _
MasterTableColumns(2), _
MasterTableColumns(3))
-------------------------------------------------------------
| AppleIndex | AppleCost | AppleColor | AppleDescription |
------------------------------------------------------------
| 1 | 3 | Red | This is an apple |
| 2 | 5 | Green | This is an apple |
| 3 | 4 | Pink | This is an apple |
| 4 | 2 | Yellow | This is an apple |
| 5 | 2 | Orange | This is an apple |
| 1 | 3 | Red | This is a duplicate|
| 2 | 5 | Green | This is a duplicate|
| 3 | 4 | Pink | This is a duplicate|
| 4 | 2 | Yellow | This is a duplicate|
| 5 | 2 | Orange | This is a duplicate|
-------------------------------------------------------------
Private Sub LinqTwoTableInnerJoin(ByRef qMasterDS As DataSet, _
ByRef qMasterTable As DataTable, _
ByRef qSecondDS As DataSet, _
ByRef qSecondTable As DataTable, _
ByRef qPrimaryKey As String, _
ByRef qForignKey As String, _
ByVal qResultsName As String)
Dim TheMasterTable As String = qMasterTable.TableName
Dim TheSecondTable As String = qSecondTable.TableName
Dim ThePrimaryKey As String = qPrimaryKey
Dim TheForignKey As String = qForignKey
Dim TheNewForignKey As String = ""
MasterTableColumns = GetColumns(qMasterDS, TheMasterTable)
SecondTableColumns = GetColumns(qSecondDS, TheSecondTable)
Dim mColumnCount As Integer = MasterTableColumns.Count
Dim sColumnCount As Integer = SecondTableColumns.Count
Dim ColumnCount As Integer = mColumnCount + sColumnCount
Dim LinqMasterTable = qMasterDS.Tables(TheMasterTable).AsEnumerable
Dim LinqSecondTable = qSecondDS.Tables(TheSecondTable).AsEnumerable
Dim Matches = From mRows In LinqMasterTable Join sRows In LinqSecondTable _
On mRows(ThePrimaryKey) Equals sRows(TheForignKey) _
Order By mRows(ThePrimaryKey) _
Select mRows, sRows
' Make sure the dataset is available and/or cleared:
If dsResults.Tables(qResultsName) Is Nothing Then dsResults.Tables.Add(qResultsName)
dsResults.Tables(qResultsName).Clear() : dsResults.Tables(qResultsName).Columns.Clear()
'Adds Master Table Column Names
For x = 0 To MasterTableColumns.Count - 1
dsResults.Tables(qResultsName).Columns.Add(MasterTableColumns(x))
Next
'Rename Second Table Names if Needed:
For x = 0 To SecondTableColumns.Count - 1
With dsResults.Tables(qResultsName)
For y = 0 To .Columns.Count - 1
If SecondTableColumns(x) = .Columns(y).ColumnName Then
SecondTableColumns(x) = SecondTableColumns(x) & "_2"
End If
Next
End With
Next
'Make sure that the Forign Key is a Unique Value
If ForignKey1 = PrimaryKey Then
TheNewForignKey = ForignKey1 & "_2"
Else
TheNewForignKey = ForignKey1
End If
'Adds Second Table Column Names
For x = 0 To SecondTableColumns.Count - 1
dsResults.Tables(qResultsName).Columns.Add(SecondTableColumns(x))
Next
'Copy Results into the Dataset:
For Each Match In Matches
'Build an array for each row:
Dim NewRow(ColumnCount - 1) As Object
'Add the mRow Items:
For x = 0 To MasterTableColumns.Count - 1
NewRow(x) = Match.mRows.Item(x)
Next
'Add the srow Items:
For x = 0 To SecondTableColumns.Count - 1
Dim y As Integer = x + (MasterTableColumns.Count)
NewRow(y) = Match.sRows.Item(x)
Next
'Add the array to dsResults as a Row:
dsResults.Tables(qResultsName).Rows.Add(NewRow)
Next
If chkUnique.Checked = True Then
ReMoveDuplicates(dsResults.Tables(qResultsName), ThePrimaryKey)
End If
Private Sub ReMoveDuplicates(ByRef SkipTable As DataTable, _
ByRef TableKey As String)
'Make sure that there's data to work with:
If SkipTable Is Nothing Then Exit Sub
If TableKey Is Nothing Then Exit Sub
'Create an ArrayList of rows to delete:
Dim DeleteRows As New ArrayList()
'Fill the Array with Row Number of the items equal
'to the item above them:
For x = 1 To SkipTable.Rows.Count - 1
Dim RowOne As DataRow = SkipTable.Rows(x - 1)
Dim RowTwo As DataRow = SkipTable.Rows(x)
If RowTwo.Item(TableKey) = RowOne.Item(TableKey) Then
DeleteRows.Add(x)
End If
Next
'If there are no hits, exit this sub:
If DeleteRows.Count < 1 Or DeleteRows Is Nothing Then
Exit Sub
End If
'Otherwise, remove the rows based on the row count value:
For x = 0 To DeleteRows.Count - 1
'Start at the END and count backwards so the duplicate
'item's row count value doesn't change with each deleted row
Dim KillRow As Integer = DeleteRows((DeleteRows.Count - 1) - x)
'Delete the row:
SkipTable.Rows(KillRow).Delete()
Next
End Sub
If Not chkRetainKeys.Checked = True Then 'Removes Forign Key
dsResults.Tables(qResultsName).Columns.Remove(TheNewForignKey)
End If
'Clear Arrays
MasterTableColumns.Clear()
SecondTableColumns.Clear()
-------------------------------------------------------------
| AppleIndex | AppleCost | AppleColor | AppleDescription |
------------------------------------------------------------
| 1 | 3 | Red | This is an apple |
| 2 | 5 | Green | This is an apple |
| 3 | 4 | Pink | This is an apple |
| 4 | 2 | Yellow | This is an apple |
| 5 | 2 | Orange | This is an apple |
| 1 | 3 | Red | This is a duplicate|
| 2 | 5 | Green | This is a duplicate|
| 3 | 4 | Pink | This is a duplicate|
| 4 | 2 | Yellow | This is a duplicate|
| 5 | 2 | Orange | This is a duplicate|
-------------------------------------------------------------
------------------------------------------------------------
| OrangeIndex | OrangeCost | OrangeColor | OrangeDescription |
------------------------------------------------------------
| 1 | 1 | Orange | This is an Orange |
| 2 | 3 | Orange | |
| 3 | 2 | Orange | This is an Orange |
| 4 | 3 | Orange | |
| 5 | 2 | Orange | This is an Orange |
------------------------------------------------------------
Dim Matches = From mRows In LinqMasterTable Join sRows In LinqSecondTable _
On mRows(ThePrimaryKey) Equals sRows(TheForignKey) _
Order By mRows(ThePrimaryKey) _
Select mRows, sRows Distinct
-------------------------------------------------------------------------
| 1 | 3 | Red | This is an apple | 1 | Orange | This is an Orange |
| 1 | 3 | Red | This is an duplicate | 1 | Orange | This is an Orange |
| 2 | 5 | Green | This is an apple | 3 | Orange | |
| 2 | 5 | Green | This is an duplicate | 3 | Orange | |
| 3 | 4 | Pink | This is an apple | 2 | Orange | This is an Orange |
| 3 | 4 | Pink | This is an duplicate | 2 | Orange | This is an Orange |
| 4 | 2 | Yellow | This is an apple | 3 | Orange | |
| 4 | 2 | Yellow | This is an duplicate | 3 | Orange | |
| 5 | 2 | Orange | This is an apple | 2 | Orange | This is an Orange |
| 5 | 2 | Orange | This is an duplicate | 2 | Orange | This is an Orange |
-------------------------------------------------------------------------
------------------------------------------------------------------------
| 1 | 3 | Red | This is an apple | 1 | 1 | Orange | This is an Orange |
| 2 | 5 | Green | This is an apple | 2 | 3 | Orange | |
| 3 | 4 | Pink | This is an apple | 3 | 2 | Orange | This is an Orange |
| 4 | 2 | Yellow | This is an apple | 4 | 3 | Orange | |
| 5 | 2 | Orange | This is an apple | 5 | 2 | Orange | This is an Orange |
------------------------------------------------------------------------
'Get the original Column Names into an Array List
'MasterTableColumns = GetColumns(qMasterDS, TheMasterTable) '(external code)
'Plug the Existing DataSet into a DataView:
Dim View As DataView = New DataView(qMasterTable)
'Sort by the Primary Key:
View.Sort = ThePrimaryKey
'Build a new table listing only one column:
Dim newListTable As DataTable = _
View.ToTable("UniqueData", True, ThePrimaryKey)
-------------
| AppleIndex |
-------------
| 1 |
| 2 |
| 3 |
| 4 |
| 5 |
-------------
'Build a new table with ALL the columns:
Dim newFullTable As DataTable = _
View.ToTable("UniqueData", True, _
MasterTableColumns(0), _
MasterTableColumns(1), _
MasterTableColumns(2), _
MasterTableColumns(3))
-------------------------------------------------------------
| AppleIndex | AppleCost | AppleColor | AppleDescription |
------------------------------------------------------------
| 1 | 3 | Red | This is an apple |
| 2 | 5 | Green | This is an apple |
| 3 | 4 | Pink | This is an apple |
| 4 | 2 | Yellow | This is an apple |
| 5 | 2 | Orange | This is an apple |
| 1 | 3 | Red | This is a duplicate|
| 2 | 5 | Green | This is a duplicate|
| 3 | 4 | Pink | This is a duplicate|
| 4 | 2 | Yellow | This is a duplicate|
| 5 | 2 | Orange | This is a duplicate|
-------------------------------------------------------------
Private Sub LinqTwoTableInnerJoin(ByRef qMasterDS As DataSet, _
ByRef qMasterTable As DataTable, _
ByRef qSecondDS As DataSet, _
ByRef qSecondTable As DataTable, _
ByRef qPrimaryKey As String, _
ByRef qForignKey As String, _
ByVal qResultsName As String)
Dim TheMasterTable As String = qMasterTable.TableName
Dim TheSecondTable As String = qSecondTable.TableName
Dim ThePrimaryKey As String = qPrimaryKey
Dim TheForignKey As String = qForignKey
Dim TheNewForignKey As String = ""
MasterTableColumns = GetColumns(qMasterDS, TheMasterTable)
SecondTableColumns = GetColumns(qSecondDS, TheSecondTable)
Dim mColumnCount As Integer = MasterTableColumns.Count
Dim sColumnCount As Integer = SecondTableColumns.Count
Dim ColumnCount As Integer = mColumnCount + sColumnCount
Dim LinqMasterTable = qMasterDS.Tables(TheMasterTable).AsEnumerable
Dim LinqSecondTable = qSecondDS.Tables(TheSecondTable).AsEnumerable
Dim Matches = From mRows In LinqMasterTable Join sRows In LinqSecondTable _
On mRows(ThePrimaryKey) Equals sRows(TheForignKey) _
Order By mRows(ThePrimaryKey) _
Select mRows, sRows
' Make sure the dataset is available and/or cleared:
If dsResults.Tables(qResultsName) Is Nothing Then dsResults.Tables.Add(qResultsName)
dsResults.Tables(qResultsName).Clear() : dsResults.Tables(qResultsName).Columns.Clear()
'Adds Master Table Column Names
For x = 0 To MasterTableColumns.Count - 1
dsResults.Tables(qResultsName).Columns.Add(MasterTableColumns(x))
Next
'Rename Second Table Names if Needed:
For x = 0 To SecondTableColumns.Count - 1
With dsResults.Tables(qResultsName)
For y = 0 To .Columns.Count - 1
If SecondTableColumns(x) = .Columns(y).ColumnName Then
SecondTableColumns(x) = SecondTableColumns(x) & "_2"
End If
Next
End With
Next
'Make sure that the Forign Key is a Unique Value
If ForignKey1 = PrimaryKey Then
TheNewForignKey = ForignKey1 & "_2"
Else
TheNewForignKey = ForignKey1
End If
'Adds Second Table Column Names
For x = 0 To SecondTableColumns.Count - 1
dsResults.Tables(qResultsName).Columns.Add(SecondTableColumns(x))
Next
'Copy Results into the Dataset:
For Each Match In Matches
'Build an array for each row:
Dim NewRow(ColumnCount - 1) As Object
'Add the mRow Items:
For x = 0 To MasterTableColumns.Count - 1
NewRow(x) = Match.mRows.Item(x)
Next
'Add the srow Items:
For x = 0 To SecondTableColumns.Count - 1
Dim y As Integer = x + (MasterTableColumns.Count)
NewRow(y) = Match.sRows.Item(x)
Next
'Add the array to dsResults as a Row:
dsResults.Tables(qResultsName).Rows.Add(NewRow)
Next
If chkUnique.Checked = True Then
ReMoveDuplicates(dsResults.Tables(qResultsName), ThePrimaryKey)
End If
Private Sub ReMoveDuplicates(ByRef SkipTable As DataTable, _
ByRef TableKey As String)
'Make sure that there's data to work with:
If SkipTable Is Nothing Then Exit Sub
If TableKey Is Nothing Then Exit Sub
'Create an ArrayList of rows to delete:
Dim DeleteRows As New ArrayList()
'Fill the Array with Row Number of the items equal
'to the item above them:
For x = 1 To SkipTable.Rows.Count - 1
Dim RowOne As DataRow = SkipTable.Rows(x - 1)
Dim RowTwo As DataRow = SkipTable.Rows(x)
If RowTwo.Item(TableKey) = RowOne.Item(TableKey) Then
DeleteRows.Add(x)
End If
Next
'If there are no hits, exit this sub:
If DeleteRows.Count < 1 Or DeleteRows Is Nothing Then
Exit Sub
End If
'Otherwise, remove the rows based on the row count value:
For x = 0 To DeleteRows.Count - 1
'Start at the END and count backwards so the duplicate
'item's row count value doesn't change with each deleted row
Dim KillRow As Integer = DeleteRows((DeleteRows.Count - 1) - x)
'Delete the row:
SkipTable.Rows(KillRow).Delete()
Next
End Sub
If Not chkRetainKeys.Checked = True Then 'Removes Forign Key
dsResults.Tables(qResultsName).Columns.Remove(TheNewForignKey)
End If
'Clear Arrays
MasterTableColumns.Clear()
SecondTableColumns.Clear()
-------------------------------------------------------------
| AppleIndex | AppleCost | AppleColor | AppleDescription |
------------------------------------------------------------
| 1 | 3 | Red | This is an apple |
| 2 | 5 | Green | This is an apple |
| 3 | 4 | Pink | This is an apple |
| 4 | 2 | Yellow | This is an apple |
| 5 | 2 | Orange | This is an apple |
| 1 | 3 | Red | This is a duplicate|
| 2 | 5 | Green | This is a duplicate|
| 3 | 4 | Pink | This is a duplicate|
| 4 | 2 | Yellow | This is a duplicate|
| 5 | 2 | Orange | This is a duplicate|
-------------------------------------------------------------
------------------------------------------------------------
| OrangeIndex | OrangeCost | OrangeColor | OrangeDescription |
------------------------------------------------------------
| 1 | 1 | Orange | This is an Orange |
| 2 | 3 | Orange | |
| 3 | 2 | Orange | This is an Orange |
| 4 | 3 | Orange | |
| 5 | 2 | Orange | This is an Orange |
------------------------------------------------------------
Dim Matches = From mRows In LinqMasterTable Join sRows In LinqSecondTable _
On mRows(ThePrimaryKey) Equals sRows(TheForignKey) _
Order By mRows(ThePrimaryKey) _
Select mRows, sRows Distinct
-------------------------------------------------------------------------
| 1 | 3 | Red | This is an apple | 1 | Orange | This is an Orange |
| 1 | 3 | Red | This is an duplicate | 1 | Orange | This is an Orange |
| 2 | 5 | Green | This is an apple | 3 | Orange | |
| 2 | 5 | Green | This is an duplicate | 3 | Orange | |
| 3 | 4 | Pink | This is an apple | 2 | Orange | This is an Orange |
| 3 | 4 | Pink | This is an duplicate | 2 | Orange | This is an Orange |
| 4 | 2 | Yellow | This is an apple | 3 | Orange | |
| 4 | 2 | Yellow | This is an duplicate | 3 | Orange | |
| 5 | 2 | Orange | This is an apple | 2 | Orange | This is an Orange |
| 5 | 2 | Orange | This is an duplicate | 2 | Orange | This is an Orange |
-------------------------------------------------------------------------
------------------------------------------------------------------------
| 1 | 3 | Red | This is an apple | 1 | 1 | Orange | This is an Orange |
| 2 | 5 | Green | This is an apple | 2 | 3 | Orange | |
| 3 | 4 | Pink | This is an apple | 3 | 2 | Orange | This is an Orange |
| 4 | 2 | Yellow | This is an apple | 4 | 3 | Orange | |
| 5 | 2 | Orange | This is an apple | 5 | 2 | Orange | This is an Orange |
------------------------------------------------------------------------
'Get the original Column Names into an Array List
'MasterTableColumns = GetColumns(qMasterDS, TheMasterTable) '(external code)
'Plug the Existing DataSet into a DataView:
Dim View As DataView = New DataView(qMasterTable)
'Sort by the Primary Key:
View.Sort = ThePrimaryKey
'Build a new table listing only one column:
Dim newListTable As DataTable = _
View.ToTable("UniqueData", True, ThePrimaryKey)
-------------
| AppleIndex |
-------------
| 1 |
| 2 |
| 3 |
| 4 |
| 5 |
-------------
'Build a new table with ALL the columns:
Dim newFullTable As DataTable = _
View.ToTable("UniqueData", True, _
MasterTableColumns(0), _
MasterTableColumns(1), _
MasterTableColumns(2), _
MasterTableColumns(3))
-------------------------------------------------------------
| AppleIndex | AppleCost | AppleColor | AppleDescription |
------------------------------------------------------------
| 1 | 3 | Red | This is an apple |
| 2 | 5 | Green | This is an apple |
| 3 | 4 | Pink | This is an apple |
| 4 | 2 | Yellow | This is an apple |
| 5 | 2 | Orange | This is an apple |
| 1 | 3 | Red | This is a duplicate|
| 2 | 5 | Green | This is a duplicate|
| 3 | 4 | Pink | This is a duplicate|
| 4 | 2 | Yellow | This is a duplicate|
| 5 | 2 | Orange | This is a duplicate|
-------------------------------------------------------------
Private Sub LinqTwoTableInnerJoin(ByRef qMasterDS As DataSet, _
ByRef qMasterTable As DataTable, _
ByRef qSecondDS As DataSet, _
ByRef qSecondTable As DataTable, _
ByRef qPrimaryKey As String, _
ByRef qForignKey As String, _
ByVal qResultsName As String)
Dim TheMasterTable As String = qMasterTable.TableName
Dim TheSecondTable As String = qSecondTable.TableName
Dim ThePrimaryKey As String = qPrimaryKey
Dim TheForignKey As String = qForignKey
Dim TheNewForignKey As String = ""
MasterTableColumns = GetColumns(qMasterDS, TheMasterTable)
SecondTableColumns = GetColumns(qSecondDS, TheSecondTable)
Dim mColumnCount As Integer = MasterTableColumns.Count
Dim sColumnCount As Integer = SecondTableColumns.Count
Dim ColumnCount As Integer = mColumnCount + sColumnCount
Dim LinqMasterTable = qMasterDS.Tables(TheMasterTable).AsEnumerable
Dim LinqSecondTable = qSecondDS.Tables(TheSecondTable).AsEnumerable
Dim Matches = From mRows In LinqMasterTable Join sRows In LinqSecondTable _
On mRows(ThePrimaryKey) Equals sRows(TheForignKey) _
Order By mRows(ThePrimaryKey) _
Select mRows, sRows
' Make sure the dataset is available and/or cleared:
If dsResults.Tables(qResultsName) Is Nothing Then dsResults.Tables.Add(qResultsName)
dsResults.Tables(qResultsName).Clear() : dsResults.Tables(qResultsName).Columns.Clear()
'Adds Master Table Column Names
For x = 0 To MasterTableColumns.Count - 1
dsResults.Tables(qResultsName).Columns.Add(MasterTableColumns(x))
Next
'Rename Second Table Names if Needed:
For x = 0 To SecondTableColumns.Count - 1
With dsResults.Tables(qResultsName)
For y = 0 To .Columns.Count - 1
If SecondTableColumns(x) = .Columns(y).ColumnName Then
SecondTableColumns(x) = SecondTableColumns(x) & "_2"
End If
Next
End With
Next
'Make sure that the Forign Key is a Unique Value
If ForignKey1 = PrimaryKey Then
TheNewForignKey = ForignKey1 & "_2"
Else
TheNewForignKey = ForignKey1
End If
'Adds Second Table Column Names
For x = 0 To SecondTableColumns.Count - 1
dsResults.Tables(qResultsName).Columns.Add(SecondTableColumns(x))
Next
'Copy Results into the Dataset:
For Each Match In Matches
'Build an array for each row:
Dim NewRow(ColumnCount - 1) As Object
'Add the mRow Items:
For x = 0 To MasterTableColumns.Count - 1
NewRow(x) = Match.mRows.Item(x)
Next
'Add the srow Items:
For x = 0 To SecondTableColumns.Count - 1
Dim y As Integer = x + (MasterTableColumns.Count)
NewRow(y) = Match.sRows.Item(x)
Next
'Add the array to dsResults as a Row:
dsResults.Tables(qResultsName).Rows.Add(NewRow)
Next
If chkUnique.Checked = True Then
ReMoveDuplicates(dsResults.Tables(qResultsName), ThePrimaryKey)
End If
Private Sub ReMoveDuplicates(ByRef SkipTable As DataTable, _
ByRef TableKey As String)
'Make sure that there's data to work with:
If SkipTable Is Nothing Then Exit Sub
If TableKey Is Nothing Then Exit Sub
'Create an ArrayList of rows to delete:
Dim DeleteRows As New ArrayList()
'Fill the Array with Row Number of the items equal
'to the item above them:
For x = 1 To SkipTable.Rows.Count - 1
Dim RowOne As DataRow = SkipTable.Rows(x - 1)
Dim RowTwo As DataRow = SkipTable.Rows(x)
If RowTwo.Item(TableKey) = RowOne.Item(TableKey) Then
DeleteRows.Add(x)
End If
Next
'If there are no hits, exit this sub:
If DeleteRows.Count < 1 Or DeleteRows Is Nothing Then
Exit Sub
End If
'Otherwise, remove the rows based on the row count value:
For x = 0 To DeleteRows.Count - 1
'Start at the END and count backwards so the duplicate
'item's row count value doesn't change with each deleted row
Dim KillRow As Integer = DeleteRows((DeleteRows.Count - 1) - x)
'Delete the row:
SkipTable.Rows(KillRow).Delete()
Next
End Sub
If Not chkRetainKeys.Checked = True Then 'Removes Forign Key
dsResults.Tables(qResultsName).Columns.Remove(TheNewForignKey)
End If
'Clear Arrays
MasterTableColumns.Clear()
SecondTableColumns.Clear()
-------------------------------------------------------------
| AppleIndex | AppleCost | AppleColor | AppleDescription |
------------------------------------------------------------
| 1 | 3 | Red | This is an apple |
| 2 | 5 | Green | This is an apple |
| 3 | 4 | Pink | This is an apple |
| 4 | 2 | Yellow | This is an apple |
| 5 | 2 | Orange | This is an apple |
| 1 | 3 | Red | This is a duplicate|
| 2 | 5 | Green | This is a duplicate|
| 3 | 4 | Pink | This is a duplicate|
| 4 | 2 | Yellow | This is a duplicate|
| 5 | 2 | Orange | This is a duplicate|
-------------------------------------------------------------
------------------------------------------------------------
| OrangeIndex | OrangeCost | OrangeColor | OrangeDescription |
------------------------------------------------------------
| 1 | 1 | Orange | This is an Orange |
| 2 | 3 | Orange | |
| 3 | 2 | Orange | This is an Orange |
| 4 | 3 | Orange | |
| 5 | 2 | Orange | This is an Orange |
------------------------------------------------------------
Dim Matches = From mRows In LinqMasterTable Join sRows In LinqSecondTable _
On mRows(ThePrimaryKey) Equals sRows(TheForignKey) _
Order By mRows(ThePrimaryKey) _
Select mRows, sRows Distinct
-------------------------------------------------------------------------
| 1 | 3 | Red | This is an apple | 1 | Orange | This is an Orange |
| 1 | 3 | Red | This is an duplicate | 1 | Orange | This is an Orange |
| 2 | 5 | Green | This is an apple | 3 | Orange | |
| 2 | 5 | Green | This is an duplicate | 3 | Orange | |
| 3 | 4 | Pink | This is an apple | 2 | Orange | This is an Orange |
| 3 | 4 | Pink | This is an duplicate | 2 | Orange | This is an Orange |
| 4 | 2 | Yellow | This is an apple | 3 | Orange | |
| 4 | 2 | Yellow | This is an duplicate | 3 | Orange | |
| 5 | 2 | Orange | This is an apple | 2 | Orange | This is an Orange |
| 5 | 2 | Orange | This is an duplicate | 2 | Orange | This is an Orange |
-------------------------------------------------------------------------
------------------------------------------------------------------------
| 1 | 3 | Red | This is an apple | 1 | 1 | Orange | This is an Orange |
| 2 | 5 | Green | This is an apple | 2 | 3 | Orange | |
| 3 | 4 | Pink | This is an apple | 3 | 2 | Orange | This is an Orange |
| 4 | 2 | Yellow | This is an apple | 4 | 3 | Orange | |
| 5 | 2 | Orange | This is an apple | 5 | 2 | Orange | This is an Orange |
------------------------------------------------------------------------
'Get the original Column Names into an Array List
'MasterTableColumns = GetColumns(qMasterDS, TheMasterTable) '(external code)
'Plug the Existing DataSet into a DataView:
Dim View As DataView = New DataView(qMasterTable)
'Sort by the Primary Key:
View.Sort = ThePrimaryKey
'Build a new table listing only one column:
Dim newListTable As DataTable = _
View.ToTable("UniqueData", True, ThePrimaryKey)
-------------
| AppleIndex |
-------------
| 1 |
| 2 |
| 3 |
| 4 |
| 5 |
-------------
'Build a new table with ALL the columns:
Dim newFullTable As DataTable = _
View.ToTable("UniqueData", True, _
MasterTableColumns(0), _
MasterTableColumns(1), _
MasterTableColumns(2), _
MasterTableColumns(3))
-------------------------------------------------------------
| AppleIndex | AppleCost | AppleColor | AppleDescription |
------------------------------------------------------------
| 1 | 3 | Red | This is an apple |
| 2 | 5 | Green | This is an apple |
| 3 | 4 | Pink | This is an apple |
| 4 | 2 | Yellow | This is an apple |
| 5 | 2 | Orange | This is an apple |
| 1 | 3 | Red | This is a duplicate|
| 2 | 5 | Green | This is a duplicate|
| 3 | 4 | Pink | This is a duplicate|
| 4 | 2 | Yellow | This is a duplicate|
| 5 | 2 | Orange | This is a duplicate|
-------------------------------------------------------------
Private Sub LinqTwoTableInnerJoin(ByRef qMasterDS As DataSet, _
ByRef qMasterTable As DataTable, _
ByRef qSecondDS As DataSet, _
ByRef qSecondTable As DataTable, _
ByRef qPrimaryKey As String, _
ByRef qForignKey As String, _
ByVal qResultsName As String)
Dim TheMasterTable As String = qMasterTable.TableName
Dim TheSecondTable As String = qSecondTable.TableName
Dim ThePrimaryKey As String = qPrimaryKey
Dim TheForignKey As String = qForignKey
Dim TheNewForignKey As String = ""
MasterTableColumns = GetColumns(qMasterDS, TheMasterTable)
SecondTableColumns = GetColumns(qSecondDS, TheSecondTable)
Dim mColumnCount As Integer = MasterTableColumns.Count
Dim sColumnCount As Integer = SecondTableColumns.Count
Dim ColumnCount As Integer = mColumnCount + sColumnCount
Dim LinqMasterTable = qMasterDS.Tables(TheMasterTable).AsEnumerable
Dim LinqSecondTable = qSecondDS.Tables(TheSecondTable).AsEnumerable
Dim Matches = From mRows In LinqMasterTable Join sRows In LinqSecondTable _
On mRows(ThePrimaryKey) Equals sRows(TheForignKey) _
Order By mRows(ThePrimaryKey) _
Select mRows, sRows
' Make sure the dataset is available and/or cleared:
If dsResults.Tables(qResultsName) Is Nothing Then dsResults.Tables.Add(qResultsName)
dsResults.Tables(qResultsName).Clear() : dsResults.Tables(qResultsName).Columns.Clear()
'Adds Master Table Column Names
For x = 0 To MasterTableColumns.Count - 1
dsResults.Tables(qResultsName).Columns.Add(MasterTableColumns(x))
Next
'Rename Second Table Names if Needed:
For x = 0 To SecondTableColumns.Count - 1
With dsResults.Tables(qResultsName)
For y = 0 To .Columns.Count - 1
If SecondTableColumns(x) = .Columns(y).ColumnName Then
SecondTableColumns(x) = SecondTableColumns(x) & "_2"
End If
Next
End With
Next
'Make sure that the Forign Key is a Unique Value
If ForignKey1 = PrimaryKey Then
TheNewForignKey = ForignKey1 & "_2"
Else
TheNewForignKey = ForignKey1
End If
'Adds Second Table Column Names
For x = 0 To SecondTableColumns.Count - 1
dsResults.Tables(qResultsName).Columns.Add(SecondTableColumns(x))
Next
'Copy Results into the Dataset:
For Each Match In Matches
'Build an array for each row:
Dim NewRow(ColumnCount - 1) As Object
'Add the mRow Items:
For x = 0 To MasterTableColumns.Count - 1
NewRow(x) = Match.mRows.Item(x)
Next
'Add the srow Items:
For x = 0 To SecondTableColumns.Count - 1
Dim y As Integer = x + (MasterTableColumns.Count)
NewRow(y) = Match.sRows.Item(x)
Next
'Add the array to dsResults as a Row:
dsResults.Tables(qResultsName).Rows.Add(NewRow)
Next
If chkUnique.Checked = True Then
ReMoveDuplicates(dsResults.Tables(qResultsName), ThePrimaryKey)
End If
Private Sub ReMoveDuplicates(ByRef SkipTable As DataTable, _
ByRef TableKey As String)
'Make sure that there's data to work with:
If SkipTable Is Nothing Then Exit Sub
If TableKey Is Nothing Then Exit Sub
'Create an ArrayList of rows to delete:
Dim DeleteRows As New ArrayList()
'Fill the Array with Row Number of the items equal
'to the item above them:
For x = 1 To SkipTable.Rows.Count - 1
Dim RowOne As DataRow = SkipTable.Rows(x - 1)
Dim RowTwo As DataRow = SkipTable.Rows(x)
If RowTwo.Item(TableKey) = RowOne.Item(TableKey) Then
DeleteRows.Add(x)
End If
Next
'If there are no hits, exit this sub:
If DeleteRows.Count < 1 Or DeleteRows Is Nothing Then
Exit Sub
End If
'Otherwise, remove the rows based on the row count value:
For x = 0 To DeleteRows.Count - 1
'Start at the END and count backwards so the duplicate
'item's row count value doesn't change with each deleted row
Dim KillRow As Integer = DeleteRows((DeleteRows.Count - 1) - x)
'Delete the row:
SkipTable.Rows(KillRow).Delete()
Next
End Sub
If Not chkRetainKeys.Checked = True Then 'Removes Forign Key
dsResults.Tables(qResultsName).Columns.Remove(TheNewForignKey)
End If
'Clear Arrays
MasterTableColumns.Clear()
SecondTableColumns.Clear()
-------------------------------------------------------------
| AppleIndex | AppleCost | AppleColor | AppleDescription |
------------------------------------------------------------
| 1 | 3 | Red | This is an apple |
| 2 | 5 | Green | This is an apple |
| 3 | 4 | Pink | This is an apple |
| 4 | 2 | Yellow | This is an apple |
| 5 | 2 | Orange | This is an apple |
| 1 | 3 | Red | This is a duplicate|
| 2 | 5 | Green | This is a duplicate|
| 3 | 4 | Pink | This is a duplicate|
| 4 | 2 | Yellow | This is a duplicate|
| 5 | 2 | Orange | This is a duplicate|
-------------------------------------------------------------
------------------------------------------------------------
| OrangeIndex | OrangeCost | OrangeColor | OrangeDescription |
------------------------------------------------------------
| 1 | 1 | Orange | This is an Orange |
| 2 | 3 | Orange | |
| 3 | 2 | Orange | This is an Orange |
| 4 | 3 | Orange | |
| 5 | 2 | Orange | This is an Orange |
------------------------------------------------------------
Dim Matches = From mRows In LinqMasterTable Join sRows In LinqSecondTable _
On mRows(ThePrimaryKey) Equals sRows(TheForignKey) _
Order By mRows(ThePrimaryKey) _
Select mRows, sRows Distinct
-------------------------------------------------------------------------
| 1 | 3 | Red | This is an apple | 1 | Orange | This is an Orange |
| 1 | 3 | Red | This is an duplicate | 1 | Orange | This is an Orange |
| 2 | 5 | Green | This is an apple | 3 | Orange | |
| 2 | 5 | Green | This is an duplicate | 3 | Orange | |
| 3 | 4 | Pink | This is an apple | 2 | Orange | This is an Orange |
| 3 | 4 | Pink | This is an duplicate | 2 | Orange | This is an Orange |
| 4 | 2 | Yellow | This is an apple | 3 | Orange | |
| 4 | 2 | Yellow | This is an duplicate | 3 | Orange | |
| 5 | 2 | Orange | This is an apple | 2 | Orange | This is an Orange |
| 5 | 2 | Orange | This is an duplicate | 2 | Orange | This is an Orange |
-------------------------------------------------------------------------
------------------------------------------------------------------------
| 1 | 3 | Red | This is an apple | 1 | 1 | Orange | This is an Orange |
| 2 | 5 | Green | This is an apple | 2 | 3 | Orange | |
| 3 | 4 | Pink | This is an apple | 3 | 2 | Orange | This is an Orange |
| 4 | 2 | Yellow | This is an apple | 4 | 3 | Orange | |
| 5 | 2 | Orange | This is an apple | 5 | 2 | Orange | This is an Orange |
------------------------------------------------------------------------
'Get the original Column Names into an Array List
'MasterTableColumns = GetColumns(qMasterDS, TheMasterTable) '(external code)
'Plug the Existing DataSet into a DataView:
Dim View As DataView = New DataView(qMasterTable)
'Sort by the Primary Key:
View.Sort = ThePrimaryKey
'Build a new table listing only one column:
Dim newListTable As DataTable = _
View.ToTable("UniqueData", True, ThePrimaryKey)
-------------
| AppleIndex |
-------------
| 1 |
| 2 |
| 3 |
| 4 |
| 5 |
-------------
'Build a new table with ALL the columns:
Dim newFullTable As DataTable = _
View.ToTable("UniqueData", True, _
MasterTableColumns(0), _
MasterTableColumns(1), _
MasterTableColumns(2), _
MasterTableColumns(3))
-------------------------------------------------------------
| AppleIndex | AppleCost | AppleColor | AppleDescription |
------------------------------------------------------------
| 1 | 3 | Red | This is an apple |
| 2 | 5 | Green | This is an apple |
| 3 | 4 | Pink | This is an apple |
| 4 | 2 | Yellow | This is an apple |
| 5 | 2 | Orange | This is an apple |
| 1 | 3 | Red | This is a duplicate|
| 2 | 5 | Green | This is a duplicate|
| 3 | 4 | Pink | This is a duplicate|
| 4 | 2 | Yellow | This is a duplicate|
| 5 | 2 | Orange | This is a duplicate|
-------------------------------------------------------------
Private Sub LinqTwoTableInnerJoin(ByRef qMasterDS As DataSet, _
ByRef qMasterTable As DataTable, _
ByRef qSecondDS As DataSet, _
ByRef qSecondTable As DataTable, _
ByRef qPrimaryKey As String, _
ByRef qForignKey As String, _
ByVal qResultsName As String)
Dim TheMasterTable As String = qMasterTable.TableName
Dim TheSecondTable As String = qSecondTable.TableName
Dim ThePrimaryKey As String = qPrimaryKey
Dim TheForignKey As String = qForignKey
Dim TheNewForignKey As String = ""
MasterTableColumns = GetColumns(qMasterDS, TheMasterTable)
SecondTableColumns = GetColumns(qSecondDS, TheSecondTable)
Dim mColumnCount As Integer = MasterTableColumns.Count
Dim sColumnCount As Integer = SecondTableColumns.Count
Dim ColumnCount As Integer = mColumnCount + sColumnCount
Dim LinqMasterTable = qMasterDS.Tables(TheMasterTable).AsEnumerable
Dim LinqSecondTable = qSecondDS.Tables(TheSecondTable).AsEnumerable
Dim Matches = From mRows In LinqMasterTable Join sRows In LinqSecondTable _
On mRows(ThePrimaryKey) Equals sRows(TheForignKey) _
Order By mRows(ThePrimaryKey) _
Select mRows, sRows
' Make sure the dataset is available and/or cleared:
If dsResults.Tables(qResultsName) Is Nothing Then dsResults.Tables.Add(qResultsName)
dsResults.Tables(qResultsName).Clear() : dsResults.Tables(qResultsName).Columns.Clear()
'Adds Master Table Column Names
For x = 0 To MasterTableColumns.Count - 1
dsResults.Tables(qResultsName).Columns.Add(MasterTableColumns(x))
Next
'Rename Second Table Names if Needed:
For x = 0 To SecondTableColumns.Count - 1
With dsResults.Tables(qResultsName)
For y = 0 To .Columns.Count - 1
If SecondTableColumns(x) = .Columns(y).ColumnName Then
SecondTableColumns(x) = SecondTableColumns(x) & "_2"
End If
Next
End With
Next
'Make sure that the Forign Key is a Unique Value
If ForignKey1 = PrimaryKey Then
TheNewForignKey = ForignKey1 & "_2"
Else
TheNewForignKey = ForignKey1
End If
'Adds Second Table Column Names
For x = 0 To SecondTableColumns.Count - 1
dsResults.Tables(qResultsName).Columns.Add(SecondTableColumns(x))
Next
'Copy Results into the Dataset:
For Each Match In Matches
'Build an array for each row:
Dim NewRow(ColumnCount - 1) As Object
'Add the mRow Items:
For x = 0 To MasterTableColumns.Count - 1
NewRow(x) = Match.mRows.Item(x)
Next
'Add the srow Items:
For x = 0 To SecondTableColumns.Count - 1
Dim y As Integer = x + (MasterTableColumns.Count)
NewRow(y) = Match.sRows.Item(x)
Next
'Add the array to dsResults as a Row:
dsResults.Tables(qResultsName).Rows.Add(NewRow)
Next
If chkUnique.Checked = True Then
ReMoveDuplicates(dsResults.Tables(qResultsName), ThePrimaryKey)
End If
Private Sub ReMoveDuplicates(ByRef SkipTable As DataTable, _
ByRef TableKey As String)
'Make sure that there's data to work with:
If SkipTable Is Nothing Then Exit Sub
If TableKey Is Nothing Then Exit Sub
'Create an ArrayList of rows to delete:
Dim DeleteRows As New ArrayList()
'Fill the Array with Row Number of the items equal
'to the item above them:
For x = 1 To SkipTable.Rows.Count - 1
Dim RowOne As DataRow = SkipTable.Rows(x - 1)
Dim RowTwo As DataRow = SkipTable.Rows(x)
If RowTwo.Item(TableKey) = RowOne.Item(TableKey) Then
DeleteRows.Add(x)
End If
Next
'If there are no hits, exit this sub:
If DeleteRows.Count < 1 Or DeleteRows Is Nothing Then
Exit Sub
End If
'Otherwise, remove the rows based on the row count value:
For x = 0 To DeleteRows.Count - 1
'Start at the END and count backwards so the duplicate
'item's row count value doesn't change with each deleted row
Dim KillRow As Integer = DeleteRows((DeleteRows.Count - 1) - x)
'Delete the row:
SkipTable.Rows(KillRow).Delete()
Next
End Sub
If Not chkRetainKeys.Checked = True Then 'Removes Forign Key
dsResults.Tables(qResultsName).Columns.Remove(TheNewForignKey)
End If
'Clear Arrays
MasterTableColumns.Clear()
SecondTableColumns.Clear()
-------------------------------------------------------------
| AppleIndex | AppleCost | AppleColor | AppleDescription |
------------------------------------------------------------
| 1 | 3 | Red | This is an apple |
| 2 | 5 | Green | This is an apple |
| 3 | 4 | Pink | This is an apple |
| 4 | 2 | Yellow | This is an apple |
| 5 | 2 | Orange | This is an apple |
| 1 | 3 | Red | This is a duplicate|
| 2 | 5 | Green | This is a duplicate|
| 3 | 4 | Pink | This is a duplicate|
| 4 | 2 | Yellow | This is a duplicate|
| 5 | 2 | Orange | This is a duplicate|
-------------------------------------------------------------
------------------------------------------------------------
| OrangeIndex | OrangeCost | OrangeColor | OrangeDescription |
------------------------------------------------------------
| 1 | 1 | Orange | This is an Orange |
| 2 | 3 | Orange | |
| 3 | 2 | Orange | This is an Orange |
| 4 | 3 | Orange | |
| 5 | 2 | Orange | This is an Orange |
------------------------------------------------------------
Dim Matches = From mRows In LinqMasterTable Join sRows In LinqSecondTable _
On mRows(ThePrimaryKey) Equals sRows(TheForignKey) _
Order By mRows(ThePrimaryKey) _
Select mRows, sRows Distinct
-------------------------------------------------------------------------
| 1 | 3 | Red | This is an apple | 1 | Orange | This is an Orange |
| 1 | 3 | Red | This is an duplicate | 1 | Orange | This is an Orange |
| 2 | 5 | Green | This is an apple | 3 | Orange | |
| 2 | 5 | Green | This is an duplicate | 3 | Orange | |
| 3 | 4 | Pink | This is an apple | 2 | Orange | This is an Orange |
| 3 | 4 | Pink | This is an duplicate | 2 | Orange | This is an Orange |
| 4 | 2 | Yellow | This is an apple | 3 | Orange | |
| 4 | 2 | Yellow | This is an duplicate | 3 | Orange | |
| 5 | 2 | Orange | This is an apple | 2 | Orange | This is an Orange |
| 5 | 2 | Orange | This is an duplicate | 2 | Orange | This is an Orange |
-------------------------------------------------------------------------
------------------------------------------------------------------------
| 1 | 3 | Red | This is an apple | 1 | 1 | Orange | This is an Orange |
| 2 | 5 | Green | This is an apple | 2 | 3 | Orange | |
| 3 | 4 | Pink | This is an apple | 3 | 2 | Orange | This is an Orange |
| 4 | 2 | Yellow | This is an apple | 4 | 3 | Orange | |
| 5 | 2 | Orange | This is an apple | 5 | 2 | Orange | This is an Orange |
------------------------------------------------------------------------
'Get the original Column Names into an Array List
'MasterTableColumns = GetColumns(qMasterDS, TheMasterTable) '(external code)
'Plug the Existing DataSet into a DataView:
Dim View As DataView = New DataView(qMasterTable)
'Sort by the Primary Key:
View.Sort = ThePrimaryKey
'Build a new table listing only one column:
Dim newListTable As DataTable = _
View.ToTable("UniqueData", True, ThePrimaryKey)
-------------
| AppleIndex |
-------------
| 1 |
| 2 |
| 3 |
| 4 |
| 5 |
-------------
'Build a new table with ALL the columns:
Dim newFullTable As DataTable = _
View.ToTable("UniqueData", True, _
MasterTableColumns(0), _
MasterTableColumns(1), _
MasterTableColumns(2), _
MasterTableColumns(3))
-------------------------------------------------------------
| AppleIndex | AppleCost | AppleColor | AppleDescription |
------------------------------------------------------------
| 1 | 3 | Red | This is an apple |
| 2 | 5 | Green | This is an apple |
| 3 | 4 | Pink | This is an apple |
| 4 | 2 | Yellow | This is an apple |
| 5 | 2 | Orange | This is an apple |
| 1 | 3 | Red | This is a duplicate|
| 2 | 5 | Green | This is a duplicate|
| 3 | 4 | Pink | This is a duplicate|
| 4 | 2 | Yellow | This is a duplicate|
| 5 | 2 | Orange | This is a duplicate|
-------------------------------------------------------------
Private Sub LinqTwoTableInnerJoin(ByRef qMasterDS As DataSet, _
ByRef qMasterTable As DataTable, _
ByRef qSecondDS As DataSet, _
ByRef qSecondTable As DataTable, _
ByRef qPrimaryKey As String, _
ByRef qForignKey As String, _
ByVal qResultsName As String)
Dim TheMasterTable As String = qMasterTable.TableName
Dim TheSecondTable As String = qSecondTable.TableName
Dim ThePrimaryKey As String = qPrimaryKey
Dim TheForignKey As String = qForignKey
Dim TheNewForignKey As String = ""
MasterTableColumns = GetColumns(qMasterDS, TheMasterTable)
SecondTableColumns = GetColumns(qSecondDS, TheSecondTable)
Dim mColumnCount As Integer = MasterTableColumns.Count
Dim sColumnCount As Integer = SecondTableColumns.Count
Dim ColumnCount As Integer = mColumnCount + sColumnCount
Dim LinqMasterTable = qMasterDS.Tables(TheMasterTable).AsEnumerable
Dim LinqSecondTable = qSecondDS.Tables(TheSecondTable).AsEnumerable
Dim Matches = From mRows In LinqMasterTable Join sRows In LinqSecondTable _
On mRows(ThePrimaryKey) Equals sRows(TheForignKey) _
Order By mRows(ThePrimaryKey) _
Select mRows, sRows
' Make sure the dataset is available and/or cleared:
If dsResults.Tables(qResultsName) Is Nothing Then dsResults.Tables.Add(qResultsName)
dsResults.Tables(qResultsName).Clear() : dsResults.Tables(qResultsName).Columns.Clear()
'Adds Master Table Column Names
For x = 0 To MasterTableColumns.Count - 1
dsResults.Tables(qResultsName).Columns.Add(MasterTableColumns(x))
Next
'Rename Second Table Names if Needed:
For x = 0 To SecondTableColumns.Count - 1
With dsResults.Tables(qResultsName)
For y = 0 To .Columns.Count - 1
If SecondTableColumns(x) = .Columns(y).ColumnName Then
SecondTableColumns(x) = SecondTableColumns(x) & "_2"
End If
Next
End With
Next
'Make sure that the Forign Key is a Unique Value
If ForignKey1 = PrimaryKey Then
TheNewForignKey = ForignKey1 & "_2"
Else
TheNewForignKey = ForignKey1
End If
'Adds Second Table Column Names
For x = 0 To SecondTableColumns.Count - 1
dsResults.Tables(qResultsName).Columns.Add(SecondTableColumns(x))
Next
'Copy Results into the Dataset:
For Each Match In Matches
'Build an array for each row:
Dim NewRow(ColumnCount - 1) As Object
'Add the mRow Items:
For x = 0 To MasterTableColumns.Count - 1
NewRow(x) = Match.mRows.Item(x)
Next
'Add the srow Items:
For x = 0 To SecondTableColumns.Count - 1
Dim y As Integer = x + (MasterTableColumns.Count)
NewRow(y) = Match.sRows.Item(x)
Next
'Add the array to dsResults as a Row:
dsResults.Tables(qResultsName).Rows.Add(NewRow)
Next
If chkUnique.Checked = True Then
ReMoveDuplicates(dsResults.Tables(qResultsName), ThePrimaryKey)
End If
Private Sub ReMoveDuplicates(ByRef SkipTable As DataTable, _
ByRef TableKey As String)
'Make sure that there's data to work with:
If SkipTable Is Nothing Then Exit Sub
If TableKey Is Nothing Then Exit Sub
'Create an ArrayList of rows to delete:
Dim DeleteRows As New ArrayList()
'Fill the Array with Row Number of the items equal
'to the item above them:
For x = 1 To SkipTable.Rows.Count - 1
Dim RowOne As DataRow = SkipTable.Rows(x - 1)
Dim RowTwo As DataRow = SkipTable.Rows(x)
If RowTwo.Item(TableKey) = RowOne.Item(TableKey) Then
DeleteRows.Add(x)
End If
Next
'If there are no hits, exit this sub:
If DeleteRows.Count < 1 Or DeleteRows Is Nothing Then
Exit Sub
End If
'Otherwise, remove the rows based on the row count value:
For x = 0 To DeleteRows.Count - 1
'Start at the END and count backwards so the duplicate
'item's row count value doesn't change with each deleted row
Dim KillRow As Integer = DeleteRows((DeleteRows.Count - 1) - x)
'Delete the row:
SkipTable.Rows(KillRow).Delete()
Next
End Sub
If Not chkRetainKeys.Checked = True Then 'Removes Forign Key
dsResults.Tables(qResultsName).Columns.Remove(TheNewForignKey)
End If
'Clear Arrays
MasterTableColumns.Clear()
SecondTableColumns.Clear()
Dim matches = _
From mRows In (From row In LinqMasterTable _
Group row By row(ThePrimaryKey) Into g() _
Select g.First()) _
Join sRows In LinqSecondTable _
On mRows(ThePrimaryKey) Equals sRows(TheForignKey) _
Order By mRows(ThePrimaryKey) _
Select mRows, sRows
下面是我将如何编写C#LINQ查询。这里有一个替代版本，它不使用
Distinct（）var matches = from mRows in (from row in LinqMasterTable
group row by row[ThePrimaryKey] into g
select g.First())
join sRows in LinqSecondTable
on mRows[ThePrimaryKey] Equals sRows[TheForignKey]
orderby mRows[ThePrimaryKey]
select new { mRows, sRows }
至于最近的一个错误，我完全知道如何处理。当我使用VB LINQ时，我发现编译器不喜欢复杂的分组表达式。要解决这个问题，请将
行（primarykey）Dim matches = From mRows In (From row In LinqMasterTable _
Let grouping = row(ThePrimaryKey)
Group row By grouping Into g() _
Select g.First()) _
Join sRows In LinqSecondTable _
On mRows(ThePrimaryKey) Equals sRows(TheForignKey) _
Order By mRows(ThePrimaryKey) _
Select mRows, sRows
Dim matches = From mRows In (From row In LinqMasterTable _
Group row By Grouping = row(ThePrimaryKey) Into g() _
Select g.First()) _
Join sRows In LinqSecondTable _
On mRows(ThePrimaryKey) Equals sRows(TheForignKey) _
Order By mRows(ThePrimaryKey) _
Select mRows, sRows
嗯，基本问题不是LINQ。事实上，您的第一个表包含“duplicates”，但实际上并不是重复的，因为在您的示例中，每一行都是独特的 因此，我们向您提出的问题是“如何识别原始表中的重复项？”。一旦回答了这个问题，剩下的就应该无关紧要了 例如（在C#中，因为我不确定VB语法）
声明等：
-------------------------------------------------------------
| AppleIndex | AppleCost | AppleColor | AppleDescription |
------------------------------------------------------------
| 1 | 3 | Red | This is an apple |
| 2 | 5 | Green | This is an apple |
| 3 | 4 | Pink | This is an apple |
| 4 | 2 | Yellow | This is an apple |
| 5 | 2 | Orange | This is an apple |
| 1 | 3 | Red | This is a duplicate|
| 2 | 5 | Green | This is a duplicate|
| 3 | 4 | Pink | This is a duplicate|
| 4 | 2 | Yellow | This is a duplicate|
| 5 | 2 | Orange | This is a duplicate|
-------------------------------------------------------------
------------------------------------------------------------
| OrangeIndex | OrangeCost | OrangeColor | OrangeDescription |
------------------------------------------------------------
| 1 | 1 | Orange | This is an Orange |
| 2 | 3 | Orange | |
| 3 | 2 | Orange | This is an Orange |
| 4 | 3 | Orange | |
| 5 | 2 | Orange | This is an Orange |
------------------------------------------------------------
Dim Matches = From mRows In LinqMasterTable Join sRows In LinqSecondTable _
On mRows(ThePrimaryKey) Equals sRows(TheForignKey) _
Order By mRows(ThePrimaryKey) _
Select mRows, sRows Distinct
-------------------------------------------------------------------------
| 1 | 3 | Red | This is an apple | 1 | Orange | This is an Orange |
| 1 | 3 | Red | This is an duplicate | 1 | Orange | This is an Orange |
| 2 | 5 | Green | This is an apple | 3 | Orange | |
| 2 | 5 | Green | This is an duplicate | 3 | Orange | |
| 3 | 4 | Pink | This is an apple | 2 | Orange | This is an Orange |
| 3 | 4 | Pink | This is an duplicate | 2 | Orange | This is an Orange |
| 4 | 2 | Yellow | This is an apple | 3 | Orange | |
| 4 | 2 | Yellow | This is an duplicate | 3 | Orange | |
| 5 | 2 | Orange | This is an apple | 2 | Orange | This is an Orange |
| 5 | 2 | Orange | This is an duplicate | 2 | Orange | This is an Orange |
-------------------------------------------------------------------------
------------------------------------------------------------------------
| 1 | 3 | Red | This is an apple | 1 | 1 | Orange | This is an Orange |
| 2 | 5 | Green | This is an apple | 2 | 3 | Orange | |
| 3 | 4 | Pink | This is an apple | 3 | 2 | Orange | This is an Orange |
| 4 | 2 | Yellow | This is an apple | 4 | 3 | Orange | |
| 5 | 2 | Orange | This is an apple | 5 | 2 | Orange | This is an Orange |
------------------------------------------------------------------------
'Get the original Column Names into an Array List
'MasterTableColumns = GetColumns(qMasterDS, TheMasterTable) '(external code)
'Plug the Existing DataSet into a DataView:
Dim View As DataView = New DataView(qMasterTable)
'Sort by the Primary Key:
View.Sort = ThePrimaryKey
'Build a new table listing only one column:
Dim newListTable As DataTable = _
View.ToTable("UniqueData", True, ThePrimaryKey)
-------------
| AppleIndex |
-------------
| 1 |
| 2 |
| 3 |
| 4 |
| 5 |
-------------
'Build a new table with ALL the columns:
Dim newFullTable As DataTable = _
View.ToTable("UniqueData", True, _
MasterTableColumns(0), _
MasterTableColumns(1), _
MasterTableColumns(2), _
MasterTableColumns(3))
-------------------------------------------------------------
| AppleIndex | AppleCost | AppleColor | AppleDescription |
------------------------------------------------------------
| 1 | 3 | Red | This is an apple |
| 2 | 5 | Green | This is an apple |
| 3 | 4 | Pink | This is an apple |
| 4 | 2 | Yellow | This is an apple |
| 5 | 2 | Orange | This is an apple |
| 1 | 3 | Red | This is a duplicate|
| 2 | 5 | Green | This is a duplicate|
| 3 | 4 | Pink | This is a duplicate|
| 4 | 2 | Yellow | This is a duplicate|
| 5 | 2 | Orange | This is a duplicate|
-------------------------------------------------------------
Private Sub LinqTwoTableInnerJoin(ByRef qMasterDS As DataSet, _
ByRef qMasterTable As DataTable, _
ByRef qSecondDS As DataSet, _
ByRef qSecondTable As DataTable, _
ByRef qPrimaryKey As String, _
ByRef qForignKey As String, _
ByVal qResultsName As String)
Dim TheMasterTable As String = qMasterTable.TableName
Dim TheSecondTable As String = qSecondTable.TableName
Dim ThePrimaryKey As String = qPrimaryKey
Dim TheForignKey As String = qForignKey
Dim TheNewForignKey As String = ""
MasterTableColumns = GetColumns(qMasterDS, TheMasterTable)
SecondTableColumns = GetColumns(qSecondDS, TheSecondTable)
Dim mColumnCount As Integer = MasterTableColumns.Count
Dim sColumnCount As Integer = SecondTableColumns.Count
Dim ColumnCount As Integer = mColumnCount + sColumnCount
Dim LinqMasterTable = qMasterDS.Tables(TheMasterTable).AsEnumerable
Dim LinqSecondTable = qSecondDS.Tables(TheSecondTable).AsEnumerable
Dim Matches = From mRows In LinqMasterTable Join sRows In LinqSecondTable _
On mRows(ThePrimaryKey) Equals sRows(TheForignKey) _
Order By mRows(ThePrimaryKey) _
Select mRows, sRows
' Make sure the dataset is available and/or cleared:
If dsResults.Tables(qResultsName) Is Nothing Then dsResults.Tables.Add(qResultsName)
dsResults.Tables(qResultsName).Clear() : dsResults.Tables(qResultsName).Columns.Clear()
'Adds Master Table Column Names
For x = 0 To MasterTableColumns.Count - 1
dsResults.Tables(qResultsName).Columns.Add(MasterTableColumns(x))
Next
'Rename Second Table Names if Needed:
For x = 0 To SecondTableColumns.Count - 1
With dsResults.Tables(qResultsName)
For y = 0 To .Columns.Count - 1
If SecondTableColumns(x) = .Columns(y).ColumnName Then
SecondTableColumns(x) = SecondTableColumns(x) & "_2"
End If
Next
End With
Next
'Make sure that the Forign Key is a Unique Value
If ForignKey1 = PrimaryKey Then
TheNewForignKey = ForignKey1 & "_2"
Else
TheNewForignKey = ForignKey1
End If
'Adds Second Table Column Names
For x = 0 To SecondTableColumns.Count - 1
dsResults.Tables(qResultsName).Columns.Add(SecondTableColumns(x))
Next
'Copy Results into the Dataset:
For Each Match In Matches
'Build an array for each row:
Dim NewRow(ColumnCount - 1) As Object
'Add the mRow Items:
For x = 0 To MasterTableColumns.Count - 1
NewRow(x) = Match.mRows.Item(x)
Next
'Add the srow Items:
For x = 0 To SecondTableColumns.Count - 1
Dim y As Integer = x + (MasterTableColumns.Count)
NewRow(y) = Match.sRows.Item(x)
Next
'Add the array to dsResults as a Row:
dsResults.Tables(qResultsName).Rows.Add(NewRow)
Next
If chkUnique.Checked = True Then
ReMoveDuplicates(dsResults.Tables(qResultsName), ThePrimaryKey)
End If
Private Sub ReMoveDuplicates(ByRef SkipTable As DataTable, _
ByRef TableKey As String)
'Make sure that there's data to work with:
If SkipTable Is Nothing Then Exit Sub
If TableKey Is Nothing Then Exit Sub
'Create an ArrayList of rows to delete:
Dim DeleteRows As New ArrayList()
'Fill the Array with Row Number of the items equal
'to the item above them:
For x = 1 To SkipTable.Rows.Count - 1
Dim RowOne As DataRow = SkipTable.Rows(x - 1)
Dim RowTwo As DataRow = SkipTable.Rows(x)
If RowTwo.Item(TableKey) = RowOne.Item(TableKey) Then
DeleteRows.Add(x)
End If
Next
'If there are no hits, exit this sub:
If DeleteRows.Count < 1 Or DeleteRows Is Nothing Then
Exit Sub
End If
'Otherwise, remove the rows based on the row count value:
For x = 0 To DeleteRows.Count - 1
'Start at the END and count backwards so the duplicate
'item's row count value doesn't change with each deleted row
Dim KillRow As Integer = DeleteRows((DeleteRows.Count - 1) - x)
'Delete the row:
SkipTable.Rows(KillRow).Delete()
Next
End Sub
If Not chkRetainKeys.Checked = True Then 'Removes Forign Key
dsResults.Tables(qResultsName).Columns.Remove(TheNewForignKey)
End If
'Clear Arrays
MasterTableColumns.Clear()
SecondTableColumns.Clear()
-------------------------------------------------------------
| AppleIndex | AppleCost | AppleColor | AppleDescription |
------------------------------------------------------------
| 1 | 3 | Red | This is an apple |
| 2 | 5 | Green | This is an apple |
| 3 | 4 | Pink | This is an apple |
| 4 | 2 | Yellow | This is an apple |
| 5 | 2 | Orange | This is an apple |
| 1 | 3 | Red | This is a duplicate|
| 2 | 5 | Green | This is a duplicate|
| 3 | 4 | Pink | This is a duplicate|
| 4 | 2 | Yellow | This is a duplicate|
| 5 | 2 | Orange | This is a duplicate|
-------------------------------------------------------------
------------------------------------------------------------
| OrangeIndex | OrangeCost | OrangeColor | OrangeDescription |
------------------------------------------------------------
| 1 | 1 | Orange | This is an Orange |
| 2 | 3 | Orange | |
| 3 | 2 | Orange | This is an Orange |
| 4 | 3 | Orange | |
| 5 | 2 | Orange | This is an Orange |
------------------------------------------------------------
Dim Matches = From mRows In LinqMasterTable Join sRows In LinqSecondTable _
On mRows(ThePrimaryKey) Equals sRows(TheForignKey) _
Order By mRows(ThePrimaryKey) _
Select mRows, sRows Distinct
-------------------------------------------------------------------------
| 1 | 3 | Red | This is an apple | 1 | Orange | This is an Orange |
| 1 | 3 | Red | This is an duplicate | 1 | Orange | This is an Orange |
| 2 | 5 | Green | This is an apple | 3 | Orange | |
| 2 | 5 | Green | This is an duplicate | 3 | Orange | |
| 3 | 4 | Pink | This is an apple | 2 | Orange | This is an Orange |
| 3 | 4 | Pink | This is an duplicate | 2 | Orange | This is an Orange |
| 4 | 2 | Yellow | This is an apple | 3 | Orange | |
| 4 | 2 | Yellow | This is an duplicate | 3 | Orange | |
| 5 | 2 | Orange | This is an apple | 2 | Orange | This is an Orange |
| 5 | 2 | Orange | This is an duplicate | 2 | Orange | This is an Orange |
-------------------------------------------------------------------------
------------------------------------------------------------------------
| 1 | 3 | Red | This is an apple | 1 | 1 | Orange | This is an Orange |
| 2 | 5 | Green | This is an apple | 2 | 3 | Orange | |
| 3 | 4 | Pink | This is an apple | 3 | 2 | Orange | This is an Orange |
| 4 | 2 | Yellow | This is an apple | 4 | 3 | Orange | |
| 5 | 2 | Orange | This is an apple | 5 | 2 | Orange | This is an Orange |
------------------------------------------------------------------------
'Get the original Column Names into an Array List
'MasterTableColumns = GetColumns(qMasterDS, TheMasterTable) '(external code)
'Plug the Existing DataSet into a DataView:
Dim View As DataView = New DataView(qMasterTable)
'Sort by the Primary Key:
View.Sort = ThePrimaryKey
'Build a new table listing only one column:
Dim newListTable As DataTable = _
View.ToTable("UniqueData", True, ThePrimaryKey)
-------------
| AppleIndex |
-------------
| 1 |
| 2 |
| 3 |
| 4 |
| 5 |
-------------
'Build a new table with ALL the columns:
Dim newFullTable As DataTable = _
View.ToTable("UniqueData", True, _
MasterTableColumns(0), _
MasterTableColumns(1), _
MasterTableColumns(2), _
MasterTableColumns(3))
-------------------------------------------------------------
| AppleIndex | AppleCost | AppleColor | AppleDescription |
------------------------------------------------------------
| 1 | 3 | Red | This is an apple |
| 2 | 5 | Green | This is an apple |
| 3 | 4 | Pink | This is an apple |
| 4 | 2 | Yellow | This is an apple |
| 5 | 2 | Orange | This is an apple |
| 1 | 3 | Red | This is a duplicate|
| 2 | 5 | Green | This is a duplicate|
| 3 | 4 | Pink | This is a duplicate|
| 4 | 2 | Yellow | This is a duplicate|
| 5 | 2 | Orange | This is a duplicate|
-------------------------------------------------------------
Private Sub LinqTwoTableInnerJoin(ByRef qMasterDS As DataSet, _
ByRef qMasterTable As DataTable, _
ByRef qSecondDS As DataSet, _
ByRef qSecondTable As DataTable, _
ByRef qPrimaryKey As String, _
ByRef qForignKey As String, _
ByVal qResultsName As String)
Dim TheMasterTable As String = qMasterTable.TableName
Dim TheSecondTable As String = qSecondTable.TableName
Dim ThePrimaryKey As String = qPrimaryKey
Dim TheForignKey As String = qForignKey
Dim TheNewForignKey As String = ""
MasterTableColumns = GetColumns(qMasterDS, TheMasterTable)
SecondTableColumns = GetColumns(qSecondDS, TheSecondTable)
Dim mColumnCount As Integer = MasterTableColumns.Count
Dim sColumnCount As Integer = SecondTableColumns.Count
Dim ColumnCount As Integer = mColumnCount + sColumnCount
Dim LinqMasterTable = qMasterDS.Tables(TheMasterTable).AsEnumerable
Dim LinqSecondTable = qSecondDS.Tables(TheSecondTable).AsEnumerable
Dim Matches = From mRows In LinqMasterTable Join sRows In LinqSecondTable _
On mRows(ThePrimaryKey) Equals sRows(TheForignKey) _
Order By mRows(ThePrimaryKey) _
Select mRows, sRows
' Make sure the dataset is available and/or cleared:
If dsResults.Tables(qResultsName) Is Nothing Then dsResults.Tables.Add(qResultsName)
dsResults.Tables(qResultsName).Clear() : dsResults.Tables(qResultsName).Columns.Clear()
'Adds Master Table Column Names
For x = 0 To MasterTableColumns.Count - 1
dsResults.Tables(qResultsName).Columns.Add(MasterTableColumns(x))
Next
'Rename Second Table Names if Needed:
For x = 0 To SecondTableColumns.Count - 1
With dsResults.Tables(qResultsName)
For y = 0 To .Columns.Count - 1
If SecondTableColumns(x) = .Columns(y).ColumnName Then
SecondTableColumns(x) = SecondTableColumns(x) & "_2"
End If
Next
End With
Next
'Make sure that the Forign Key is a Unique Value
If ForignKey1 = PrimaryKey Then
TheNewForignKey = ForignKey1 & "_2"
Else
TheNewForignKey = ForignKey1
End If
'Adds Second Table Column Names
For x = 0 To SecondTableColumns.Count - 1
dsResults.Tables(qResultsName).Columns.Add(SecondTableColumns(x))
Next
'Copy Results into the Dataset:
For Each Match In Matches
'Build an array for each row:
Dim NewRow(ColumnCount - 1) As Object
'Add the mRow Items:
For x = 0 To MasterTableColumns.Count - 1
NewRow(x) = Match.mRows.Item(x)
Next
'Add the srow Items:
For x = 0 To SecondTableColumns.Count - 1
Dim y As Integer = x + (MasterTableColumns.Count)
NewRow(y) = Match.sRows.Item(x)
Next
'Add the array to dsResults as a Row:
dsResults.Tables(qResultsName).Rows.Add(NewRow)
Next
If chkUnique.Checked = True Then
ReMoveDuplicates(dsResults.Tables(qResultsName), ThePrimaryKey)
End If
Private Sub ReMoveDuplicates(ByRef SkipTable As DataTable, _
ByRef TableKey As String)
'Make sure that there's data to work with:
If SkipTable Is Nothing Then Exit Sub
If TableKey Is Nothing Then Exit Sub
'Create an ArrayList of rows to delete:
Dim DeleteRows As New ArrayList()
'Fill the Array with Row Number of the items equal
'to the item above them:
For x = 1 To SkipTable.Rows.Count - 1
Dim RowOne As DataRow = SkipTable.Rows(x - 1)
Dim RowTwo As DataRow = SkipTable.Rows(x)
If RowTwo.Item(TableKey) = RowOne.Item(TableKey) Then
DeleteRows.Add(x)
End If
Next
'If there are no hits, exit this sub:
If DeleteRows.Count < 1 Or DeleteRows Is Nothing Then
Exit Sub
End If
'Otherwise, remove the rows based on the row count value:
For x = 0 To DeleteRows.Count - 1
'Start at the END and count backwards so the duplicate
'item's row count value doesn't change with each deleted row
Dim KillRow As Integer = DeleteRows((DeleteRows.Count - 1) - x)
'Delete the row:
SkipTable.Rows(KillRow).Delete()
Next
End Sub
If Not chkRetainKeys.Checked = True Then 'Removes Forign Key
dsResults.Tables(qResultsName).Columns.Remove(TheNewForignKey)
End If
'Clear Arrays
MasterTableColumns.Clear()
SecondTableColumns.Clear()
-------------------------------------------------------------
| AppleIndex | AppleCost | AppleColor | AppleDescription |
------------------------------------------------------------
| 1 | 3 | Red | This is an apple |
| 2 | 5 | Green | This is an apple |
| 3 | 4 | Pink | This is an apple |
| 4 | 2 | Yellow | This is an apple |
| 5 | 2 | Orange | This is an apple |
| 1 | 3 | Red | This is a duplicate|
| 2 | 5 | Green | This is a duplicate|
| 3 | 4 | Pink | This is a duplicate|
| 4 | 2 | Yellow | This is a duplicate|
| 5 | 2 | Orange | This is a duplicate|
-------------------------------------------------------------
------------------------------------------------------------
| OrangeIndex | OrangeCost | OrangeColor | OrangeDescription |
------------------------------------------------------------
| 1 | 1 | Orange | This is an Orange |
| 2 | 3 | Orange | |
| 3 | 2 | Orange | This is an Orange |
| 4 | 3 | Orange | |
| 5 | 2 | Orange | This is an Orange |
------------------------------------------------------------
Dim Matches = From mRows In LinqMasterTable Join sRows In LinqSecondTable _
On mRows(ThePrimaryKey) Equals sRows(TheForignKey) _
Order By mRows(ThePrimaryKey) _
Select mRows, sRows Distinct
-------------------------------------------------------------------------
| 1 | 3 | Red | This is an apple | 1 | Orange | This is an Orange |
| 1 | 3 | Red | This is an duplicate | 1 | Orange | This is an Orange |
| 2 | 5 | Green | This is an apple | 3 | Orange | |
| 2 | 5 | Green | This is an duplicate | 3 | Orange | |
| 3 | 4 | Pink | This is an apple | 2 | Orange | This is an Orange |
| 3 | 4 | Pink | This is an duplicate | 2 | Orange | This is an Orange |
| 4 | 2 | Yellow | This is an apple | 3 | Orange | |
| 4 | 2 | Yellow | This is an duplicate | 3 | Orange | |
| 5 | 2 | Orange | This is an apple | 2 | Orange | This is an Orange |
| 5 | 2 | Orange | This is an duplicate | 2 | Orange | This is an Orange |
-------------------------------------------------------------------------
------------------------------------------------------------------------
| 1 | 3 | Red | This is an apple | 1 | 1 | Orange | This is an Orange |
| 2 | 5 | Green | This is an apple | 2 | 3 | Orange | |
| 3 | 4 | Pink | This is an apple | 3 | 2 | Orange | This is an Orange |
| 4 | 2 | Yellow | This is an apple | 4 | 3 | Orange | |
| 5 | 2 | Orange | This is an apple | 5 | 2 | Orange | This is an Orange |
------------------------------------------------------------------------
'Get the original Column Names into an Array List
'MasterTableColumns = GetColumns(qMasterDS, TheMasterTable) '(external code)
'Plug the Existing DataSet into a DataView:
Dim View As DataView = New DataView(qMasterTable)
'Sort by the Primary Key:
View.Sort = ThePrimaryKey
'Build a new table listing only one column:
Dim newListTable As DataTable = _
View.ToTable("UniqueData", True, ThePrimaryKey)
-------------
| AppleIndex |
-------------
| 1 |
| 2 |
| 3 |
| 4 |
| 5 |
-------------
'Build a new table with ALL the columns:
Dim newFullTable As DataTable = _
View.ToTable("UniqueData", True, _
MasterTableColumns(0), _
MasterTableColumns(1), _
MasterTableColumns(2), _
MasterTableColumns(3))
-------------------------------------------------------------
| AppleIndex | AppleCost | AppleColor | AppleDescription |
------------------------------------------------------------
| 1 | 3 | Red | This is an apple |
| 2 | 5 | Green | This is an apple |
| 3 | 4 | Pink | This is an apple |
| 4 | 2 | Yellow | This is an apple |
| 5 | 2 | Orange | This is an apple |
| 1 | 3 | Red | This is a duplicate|
| 2 | 5 | Green | This is a duplicate|
| 3 | 4 | Pink | This is a duplicate|
| 4 | 2 | Yellow | This is a duplicate|
| 5 | 2 | Orange | This is a duplicate|
-------------------------------------------------------------
Private Sub LinqTwoTableInnerJoin(ByRef qMasterDS As DataSet, _
ByRef qMasterTable As DataTable, _
ByRef qSecondDS As DataSet, _
ByRef qSecondTable As DataTable, _
ByRef qPrimaryKey As String, _
ByRef qForignKey As String, _
ByVal qResultsName As String)
Dim TheMasterTable As String = qMasterTable.TableName
Dim TheSecondTable As String = qSecondTable.TableName
Dim ThePrimaryKey As String = qPrimaryKey
Dim TheForignKey As String = qForignKey
Dim TheNewForignKey As String = ""
MasterTableColumns = GetColumns(qMasterDS, TheMasterTable)
SecondTableColumns = GetColumns(qSecondDS, TheSecondTable)
Dim mColumnCount As Integer = MasterTableColumns.Count
Dim sColumnCount As Integer = SecondTableColumns.Count
Dim ColumnCount As Integer = mColumnCount + sColumnCount
Dim LinqMasterTable = qMasterDS.Tables(TheMasterTable).AsEnumerable
Dim LinqSecondTable = qSecondDS.Tables(TheSecondTable).AsEnumerable
Dim Matches = From mRows In LinqMasterTable Join sRows In LinqSecondTable _
On mRows(ThePrimaryKey) Equals sRows(TheForignKey) _
Order By mRows(ThePrimaryKey) _
Select mRows, sRows
' Make sure the dataset is available and/or cleared:
If dsResults.Tables(qResultsName) Is Nothing Then dsResults.Tables.Add(qResultsName)
dsResults.Tables(qResultsName).Clear() : dsResults.Tables(qResultsName).Columns.Clear()
'Adds Master Table Column Names
For x = 0 To MasterTableColumns.Count - 1
dsResults.Tables(qResultsName).Columns.Add(MasterTableColumns(x))
Next
'Rename Second Table Names if Needed:
For x = 0 To SecondTableColumns.Count - 1
With dsResults.Tables(qResultsName)
For y = 0 To .Columns.Count - 1
If SecondTableColumns(x) = .Columns(y).ColumnName Then
SecondTableColumns(x) = SecondTableColumns(x) & "_2"
End If
Next
End With
Next
'Make sure that the Forign Key is a Unique Value
If ForignKey1 = PrimaryKey Then
TheNewForignKey = ForignKey1 & "_2"
Else
TheNewForignKey = ForignKey1
End If
'Adds Second Table Column Names
For x = 0 To SecondTableColumns.Count - 1
dsResults.Tables(qResultsName).Columns.Add(SecondTableColumns(x))
Next
'Copy Results into the Dataset:
For Each Match In Matches
'Build an array for each row:
Dim NewRow(ColumnCount - 1) As Object
'Add the mRow Items:
For x = 0 To MasterTableColumns.Count - 1
NewRow(x) = Match.mRows.Item(x)
Next
'Add the srow Items:
For x = 0 To SecondTableColumns.Count - 1
Dim y As Integer = x + (MasterTableColumns.Count)
NewRow(y) = Match.sRows.Item(x)
Next
'Add the array to dsResults as a Row:
dsResults.Tables(qResultsName).Rows.Add(NewRow)
Next
If chkUnique.Checked = True Then
ReMoveDuplicates(dsResults.Tables(qResultsName), ThePrimaryKey)
End If
Private Sub ReMoveDuplicates(ByRef SkipTable As DataTable, _
ByRef TableKey As String)
'Make sure that there's data to work with:
If SkipTable Is Nothing Then Exit Sub
If TableKey Is Nothing Then Exit Sub
'Create an ArrayList of rows to delete:
Dim DeleteRows As New ArrayList()
'Fill the Array with Row Number of the items equal
'to the item above them:
For x = 1 To SkipTable.Rows.Count - 1
Dim RowOne As DataRow = SkipTable.Rows(x - 1)
Dim RowTwo As DataRow = SkipTable.Rows(x)
If RowTwo.Item(TableKey) = RowOne.Item(TableKey) Then
DeleteRows.Add(x)
End If
Next
'If there are no hits, exit this sub:
If DeleteRows.Count < 1 Or DeleteRows Is Nothing Then
Exit Sub
End If
'Otherwise, remove the rows based on the row count value:
For x = 0 To DeleteRows.Count - 1
'Start at the END and count backwards so the duplicate
'item's row count value doesn't change with each deleted row
Dim KillRow As Integer = DeleteRows((DeleteRows.Count - 1) - x)
'Delete the row:
SkipTable.Rows(KillRow).Delete()
Next
End Sub
If Not chkRetainKeys.Checked = True Then 'Removes Forign Key
dsResults.Tables(qResultsName).Columns.Remove(TheNewForignKey)
End If
'Clear Arrays
MasterTableColumns.Clear()
SecondTableColumns.Clear()
-------------------------------------------------------------
| AppleIndex | AppleCost | AppleColor | AppleDescription |
------------------------------------------------------------
| 1 | 3 | Red | This is an apple |
| 2 | 5 | Green | This is an apple |
| 3 | 4 | Pink | This is an apple |
| 4 | 2 | Yellow | This is an apple |
| 5 | 2 | Orange | This is an apple |
| 1 | 3 | Red | This is a duplicate|
| 2 | 5 | Green | This is a duplicate|
| 3 | 4 | Pink | This is a duplicate|
| 4 | 2 | Yellow | This is a duplicate|
| 5 | 2 | Orange | This is a duplicate|
-------------------------------------------------------------
------------------------------------------------------------
| OrangeIndex | OrangeCost | OrangeColor | OrangeDescription |
------------------------------------------------------------
| 1 | 1 | Orange | This is an Orange |
| 2 | 3 | Orange | |
| 3 | 2 | Orange | This is an Orange |
| 4 | 3 | Orange | |
| 5 | 2 | Orange | This is an Orange |
------------------------------------------------------------
Dim Matches = From mRows In LinqMasterTable Join sRows In LinqSecondTable _
On mRows(ThePrimaryKey) Equals sRows(TheForignKey) _
Order By mRows(ThePrimaryKey) _
Select mRows, sRows Distinct
-------------------------------------------------------------------------
| 1 | 3 | Red | This is an apple | 1 | Orange | This is an Orange |
| 1 | 3 | Red | This is an duplicate | 1 | Orange | This is an Orange |
| 2 | 5 | Green | This is an apple | 3 | Orange | |
| 2 | 5 | Green | This is an duplicate | 3 | Orange | |
| 3 | 4 | Pink | This is an apple | 2 | Orange | This is an Orange |
| 3 | 4 | Pink | This is an duplicate | 2 | Orange | This is an Orange |
| 4 | 2 | Yellow | This is an apple | 3 | Orange | |
| 4 | 2 | Yellow | This is an duplicate | 3 | Orange | |
| 5 | 2 | Orange | This is an apple | 2 | Orange | This is an Orange |
| 5 | 2 | Orange | This is an duplicate | 2 | Orange | This is an Orange |
-------------------------------------------------------------------------
------------------------------------------------------------------------
| 1 | 3 | Red | This is an apple | 1 | 1 | Orange | This is an Orange |
| 2 | 5 | Green | This is an apple | 2 | 3 | Orange | |
| 3 | 4 | Pink | This is an apple | 3 | 2 | Orange | This is an Orange |
| 4 | 2 | Yellow | This is an apple | 4 | 3 | Orange | |
| 5 | 2 | Orange | This is an apple | 5 | 2 | Orange | This is an Orange |
------------------------------------------------------------------------
'Get the original Column Names into an Array List
'MasterTableColumns = GetColumns(qMasterDS, TheMasterTable) '(external code)
'Plug the Existing DataSet into a DataView:
Dim View As DataView = New DataView(qMasterTable)
'Sort by the Primary Key:
View.Sort = ThePrimaryKey
'Build a new table listing only one column:
Dim newListTable As DataTable = _
View.ToTable("UniqueData", True, ThePrimaryKey)
-------------
| AppleIndex |
-------------
| 1 |
| 2 |
| 3 |
| 4 |
| 5 |
-------------
'Build a new table with ALL the columns:
Dim newFullTable As DataTable = _
View.ToTable("UniqueData", True, _
MasterTableColumns(0), _
MasterTableColumns(1), _
MasterTableColumns(2), _
MasterTableColumns(3))
-------------------------------------------------------------
| AppleIndex | AppleCost | AppleColor | AppleDescription |
------------------------------------------------------------
| 1 | 3 | Red | This is an apple |
| 2 | 5 | Green | This is an apple |
| 3 | 4 | Pink | This is an apple |
| 4 | 2 | Yellow | This is an apple |
| 5 | 2 | Orange | This is an apple |
| 1 | 3 | Red | This is a duplicate|
| 2 | 5 | Green | This is a duplicate|
| 3 | 4 | Pink | This is a duplicate|
| 4 | 2 | Yellow | This is a duplicate|
| 5 | 2 | Orange | This is a duplicate|
-------------------------------------------------------------
Private Sub LinqTwoTableInnerJoin(ByRef qMasterDS As DataSet, _
ByRef qMasterTable As DataTable, _
ByRef qSecondDS As DataSet, _
ByRef qSecondTable As DataTable, _
ByRef qPrimaryKey As String, _
ByRef qForignKey As String, _
ByVal qResultsName As String)
Dim TheMasterTable As String = qMasterTable.TableName
Dim TheSecondTable As String = qSecondTable.TableName
Dim ThePrimaryKey As String = qPrimaryKey
Dim TheForignKey As String = qForignKey
Dim TheNewForignKey As String = ""
MasterTableColumns = GetColumns(qMasterDS, TheMasterTable)
SecondTableColumns = GetColumns(qSecondDS, TheSecondTable)
Dim mColumnCount As Integer = MasterTableColumns.Count
Dim sColumnCount As Integer = SecondTableColumns.Count
Dim ColumnCount As Integer = mColumnCount + sColumnCount
Dim LinqMasterTable = qMasterDS.Tables(TheMasterTable).AsEnumerable
Dim LinqSecondTable = qSecondDS.Tables(TheSecondTable).AsEnumerable
Dim Matches = From mRows In LinqMasterTable Join sRows In LinqSecondTable _
On mRows(ThePrimaryKey) Equals sRows(TheForignKey) _
Order By mRows(ThePrimaryKey) _
Select mRows, sRows
' Make sure the dataset is available and/or cleared:
If dsResults.Tables(qResultsName) Is Nothing Then dsResults.Tables.Add(qResultsName)
dsResults.Tables(qResultsName).Clear() : dsResults.Tables(qResultsName).Columns.Clear()
'Adds Master Table Column Names
For x = 0 To MasterTableColumns.Count - 1
dsResults.Tables(qResultsName).Columns.Add(MasterTableColumns(x))
Next
'Rename Second Table Names if Needed:
For x = 0 To SecondTableColumns.Count - 1
With dsResults.Tables(qResultsName)
For y = 0 To .Columns.Count - 1
If SecondTableColumns(x) = .Columns(y).ColumnName Then
SecondTableColumns(x) = SecondTableColumns(x) & "_2"
End If
Next
End With
Next
'Make sure that the Forign Key is a Unique Value
If ForignKey1 = PrimaryKey Then
TheNewForignKey = ForignKey1 & "_2"
Else
TheNewForignKey = ForignKey1
End If
'Adds Second Table Column Names
For x = 0 To SecondTableColumns.Count - 1
dsResults.Tables(qResultsName).Columns.Add(SecondTableColumns(x))
Next
'Copy Results into the Dataset:
For Each Match In Matches
'Build an array for each row:
Dim NewRow(ColumnCount - 1) As Object
'Add the mRow Items:
For x = 0 To MasterTableColumns.Count - 1
NewRow(x) = Match.mRows.Item(x)
Next
'Add the srow Items:
For x = 0 To SecondTableColumns.Count - 1
Dim y As Integer = x + (MasterTableColumns.Count)
NewRow(y) = Match.sRows.Item(x)
Next
'Add the array to dsResults as a Row:
dsResults.Tables(qResultsName).Rows.Add(NewRow)
Next
If chkUnique.Checked = True Then
ReMoveDuplicates(dsResults.Tables(qResultsName), ThePrimaryKey)
End If
Private Sub ReMoveDuplicates(ByRef SkipTable As DataTable, _
ByRef TableKey As String)
'Make sure that there's data to work with:
If SkipTable Is Nothing Then Exit Sub
If TableKey Is Nothing Then Exit Sub
'Create an ArrayList of rows to delete:
Dim DeleteRows As New ArrayList()
'Fill the Array with Row Number of the items equal
'to the item above them:
For x = 1 To SkipTable.Rows.Count - 1
Dim RowOne As DataRow = SkipTable.Rows(x - 1)
Dim RowTwo As DataRow = SkipTable.Rows(x)
If RowTwo.Item(TableKey) = RowOne.Item(TableKey) Then
DeleteRows.Add(x)
End If
Next
'If there are no hits, exit this sub:
If DeleteRows.Count < 1 Or DeleteRows Is Nothing Then
Exit Sub
End If
'Otherwise, remove the rows based on the row count value:
For x = 0 To DeleteRows.Count - 1
'Start at the END and count backwards so the duplicate
'item's row count value doesn't change with each deleted row
Dim KillRow As Integer = DeleteRows((DeleteRows.Count - 1) - x)
'Delete the row:
SkipTable.Rows(KillRow).Delete()
Next
End Sub
If Not chkRetainKeys.Checked = True Then 'Removes Forign Key
dsResults.Tables(qResultsName).Columns.Remove(TheNewForignKey)
End If
'Clear Arrays
MasterTableColumns.Clear()
SecondTableColumns.Clear()
-------------------------------------------------------------
| AppleIndex | AppleCost | AppleColor | AppleDescription |
------------------------------------------------------------
| 1 | 3 | Red | This is an apple |
| 2 | 5 | Green | This is an apple |
| 3 | 4 | Pink | This is an apple |
| 4 | 2 | Yellow | This is an apple |
| 5 | 2 | Orange | This is an apple |
| 1 | 3 | Red | This is a duplicate|
| 2 | 5 | Green | This is a duplicate|
| 3 | 4 | Pink | This is a duplicate|
| 4 | 2 | Yellow | This is a duplicate|
| 5 | 2 | Orange | This is a duplicate|
-------------------------------------------------------------
------------------------------------------------------------
| OrangeIndex | OrangeCost | OrangeColor | OrangeDescription |
------------------------------------------------------------
| 1 | 1 | Orange | This is an Orange |
| 2 | 3 | Orange | |
| 3 | 2 | Orange | This is an Orange |
| 4 | 3 | Orange | |
| 5 | 2 | Orange | This is an Orange |
------------------------------------------------------------
Dim Matches = From mRows In LinqMasterTable Join sRows In LinqSecondTable _
On mRows(ThePrimaryKey) Equals sRows(TheForignKey) _
Order By mRows(ThePrimaryKey) _
Select mRows, sRows Distinct
-------------------------------------------------------------------------
| 1 | 3 | Red | This is an apple | 1 | Orange | This is an Orange |
| 1 | 3 | Red | This is an duplicate | 1 | Orange | This is an Orange |
| 2 | 5 | Green | This is an apple | 3 | Orange | |
| 2 | 5 | Green | This is an duplicate | 3 | Orange | |
| 3 | 4 | Pink | This is an apple | 2 | Orange | This is an Orange |
| 3 | 4 | Pink | This is an duplicate | 2 | Orange | This is an Orange |
| 4 | 2 | Yellow | This is an apple | 3 | Orange | |
| 4 | 2 | Yellow | This is an duplicate | 3 | Orange | |
| 5 | 2 | Orange | This is an apple | 2 | Orange | This is an Orange |
| 5 | 2 | Orange | This is an duplicate | 2 | Orange | This is an Orange |
-------------------------------------------------------------------------
------------------------------------------------------------------------
| 1 | 3 | Red | This is an apple | 1 | 1 | Orange | This is an Orange |
| 2 | 5 | Green | This is an apple | 2 | 3 | Orange | |
| 3 | 4 | Pink | This is an apple | 3 | 2 | Orange | This is an Orange |
| 4 | 2 | Yellow | This is an apple | 4 | 3 | Orange | |
| 5 | 2 | Orange | This is an apple | 5 | 2 | Orange | This is an Orange |
------------------------------------------------------------------------
'Get the original Column Names into an Array List
'MasterTableColumns = GetColumns(qMasterDS, TheMasterTable) '(external code)
'Plug the Existing DataSet into a DataView:
Dim View As DataView = New DataView(qMasterTable)
'Sort by the Primary Key:
View.Sort = ThePrimaryKey
'Build a new table listing only one column:
Dim newListTable As DataTable = _
View.ToTable("UniqueData", True, ThePrimaryKey)
-------------
| AppleIndex |
-------------
| 1 |
| 2 |
| 3 |
| 4 |
| 5 |
-------------
'Build a new table with ALL the columns:
Dim newFullTable As DataTable = _
View.ToTable("UniqueData", True, _
MasterTableColumns(0), _
MasterTableColumns(1), _
MasterTableColumns(2), _
MasterTableColumns(3))
-------------------------------------------------------------
| AppleIndex | AppleCost | AppleColor | AppleDescription |
------------------------------------------------------------
| 1 | 3 | Red | This is an apple |
| 2 | 5 | Green | This is an apple |
| 3 | 4 | Pink | This is an apple |
| 4 | 2 | Yellow | This is an apple |
| 5 | 2 | Orange | This is an apple |
| 1 | 3 | Red | This is a duplicate|
| 2 | 5 | Green | This is a duplicate|
| 3 | 4 | Pink | This is a duplicate|
| 4 | 2 | Yellow | This is a duplicate|
| 5 | 2 | Orange | This is a duplicate|
-------------------------------------------------------------
Private Sub LinqTwoTableInnerJoin(ByRef qMasterDS As DataSet, _
ByRef qMasterTable As DataTable, _
ByRef qSecondDS As DataSet, _
ByRef qSecondTable As DataTable, _
ByRef qPrimaryKey As String, _
ByRef qForignKey As String, _
ByVal qResultsName As String)
Dim TheMasterTable As String = qMasterTable.TableName
Dim TheSecondTable As String = qSecondTable.TableName
Dim ThePrimaryKey As String = qPrimaryKey
Dim TheForignKey As String = qForignKey
Dim TheNewForignKey As String = ""
MasterTableColumns = GetColumns(qMasterDS, TheMasterTable)
SecondTableColumns = GetColumns(qSecondDS, TheSecondTable)
Dim mColumnCount As Integer = MasterTableColumns.Count
Dim sColumnCount As Integer = SecondTableColumns.Count
Dim ColumnCount As Integer = mColumnCount + sColumnCount
Dim LinqMasterTable = qMasterDS.Tables(TheMasterTable).AsEnumerable
Dim LinqSecondTable = qSecondDS.Tables(TheSecondTable).AsEnumerable
Dim Matches = From mRows In LinqMasterTable Join sRows In LinqSecondTable _
On mRows(ThePrimaryKey) Equals sRows(TheForignKey) _
Order By mRows(ThePrimaryKey) _
Select mRows, sRows
' Make sure the dataset is available and/or cleared:
If dsResults.Tables(qResultsName) Is Nothing Then dsResults.Tables.Add(qResultsName)
dsResults.Tables(qResultsName).Clear() : dsResults.Tables(qResultsName).Columns.Clear()
'Adds Master Table Column Names
For x = 0 To MasterTableColumns.Count - 1
dsResults.Tables(qResultsName).Columns.Add(MasterTableColumns(x))
Next
'Rename Second Table Names if Needed:
For x = 0 To SecondTableColumns.Count - 1
With dsResults.Tables(qResultsName)
For y = 0 To .Columns.Count - 1
If SecondTableColumns(x) = .Columns(y).ColumnName Then
SecondTableColumns(x) = SecondTableColumns(x) & "_2"
End If
Next
End With
Next
'Make sure that the Forign Key is a Unique Value
If ForignKey1 = PrimaryKey Then
TheNewForignKey = ForignKey1 & "_2"
Else
TheNewForignKey = ForignKey1
End If
'Adds Second Table Column Names
For x = 0 To SecondTableColumns.Count - 1
dsResults.Tables(qResultsName).Columns.Add(SecondTableColumns(x))
Next
'Copy Results into the Dataset:
For Each Match In Matches
'Build an array for each row:
Dim NewRow(ColumnCount - 1) As Object
'Add the mRow Items:
For x = 0 To MasterTableColumns.Count - 1
NewRow(x) = Match.mRows.Item(x)
Next
'Add the srow Items:
For x = 0 To SecondTableColumns.Count - 1
Dim y As Integer = x + (MasterTableColumns.Count)
NewRow(y) = Match.sRows.Item(x)
Next
'Add the array to dsResults as a Row:
dsResults.Tables(qResultsName).Rows.Add(NewRow)
Next
If chkUnique.Checked = True Then
ReMoveDuplicates(dsResults.Tables(qResultsName), ThePrimaryKey)
End If
Private Sub ReMoveDuplicates(ByRef SkipTable As DataTable, _
ByRef TableKey As String)
'Make sure that there's data to work with:
If SkipTable Is Nothing Then Exit Sub
If TableKey Is Nothing Then Exit Sub
'Create an ArrayList of rows to delete:
Dim DeleteRows As New ArrayList()
'Fill the Array with Row Number of the items equal
'to the item above them:
For x = 1 To SkipTable.Rows.Count - 1
Dim RowOne As DataRow = SkipTable.Rows(x - 1)
Dim RowTwo As DataRow = SkipTable.Rows(x)
If RowTwo.Item(TableKey) = RowOne.Item(TableKey) Then
DeleteRows.Add(x)
End If
Next
'If there are no hits, exit this sub:
If DeleteRows.Count < 1 Or DeleteRows Is Nothing Then
Exit Sub
End If
'Otherwise, remove the rows based on the row count value:
For x = 0 To DeleteRows.Count - 1
'Start at the END and count backwards so the duplicate
'item's row count value doesn't change with each deleted row
Dim KillRow As Integer = DeleteRows((DeleteRows.Count - 1) - x)
'Delete the row:
SkipTable.Rows(KillRow).Delete()
Next
End Sub
If Not chkRetainKeys.Checked = True Then 'Removes Forign Key
dsResults.Tables(qResultsName).Columns.Remove(TheNewForignKey)
End If
'Clear Arrays
MasterTableColumns.Clear()
SecondTableColumns.Clear()
对2个4列65535行的文件和一些双精度文件运行此操作。处理时间，大约1秒。事实上，将字段加载到内存所花的时间比解析数据所花的时间要长。问题是LinqMasterTable中的所有行都已经是不同的。是的，但我本来打算按主键进行区分。我只是不知道如何在VB中表达，我想你的意思是“给定键”，因为主键本质上是不同的。我甚至不认为这在SQL中是可以表达的：“按给定键分组，然后随机选择一行”？我用OP的原始代码留下了它。如果它是一个真正的主键，那么第一个表中的这种重复从一开始就不是问题。因此，此程序的目的是允许用户将数据合并到ComboBox1和Combox2中所选“索引”上的两个文件中。他们想要删除重复项的选项。他们不在乎保留哪一件物品，只要它只是一件物品。因此，不管是“这是一个苹果”还是“这是一个复制品”，只要他们不把两者都拿回来就行了。我意识到我可以从结果或查询中省略“描述”，但一旦程序掌握在用户手中，我就无法控制他们输入的内容。除了键之外，我不能保证结果是唯一的。有时会得到一行“这是重复的”而不是相应的“这是苹果的”行，这可以接受吗？同意。不是真正的主键，这只是字符串的名称，用作助记符，以帮助跟踪我在编码时所做的事情。