Sql 类型为'的首次机会例外;系统索引自动失效异常';发生在System.Data.dll中
我刚刚将这段代码移动到一个新的子代码中,并尝试运行它,并按照tite中的说明获取异常Sql 类型为'的首次机会例外;系统索引自动失效异常';发生在System.Data.dll中,sql,vb.net,visual-studio-2010,ms-access-2007,Sql,Vb.net,Visual Studio 2010,Ms Access 2007,我刚刚将这段代码移动到一个新的子代码中,并尝试运行它,并按照tite中的说明获取异常 Public Sub LoadPanel(TableName As String) Debug.Print("LoadPanel:") 'name of module PushCallStack("LoadPanel") 'name of module Try Using dbConnection As New OleDbConnection(My.Settings.
Public Sub LoadPanel(TableName As String)
Debug.Print("LoadPanel:") 'name of module
PushCallStack("LoadPanel") 'name of module
Try
Using dbConnection As New OleDbConnection(My.Settings.SMSA_databaseConnectionString)
dbConnection.Open()
Debug.Print(" dbConnection Success")
Dim sqlcommand As String
sqlcommand = "SELECT " & TableName & ".[PanelName] FROM " & TableName & " WHERE (((" & TableName & ".[Owner])=" & CurrentClientID & ")) OR (((" & TableName & ".[Admin1])=" & CurrentClientID & ")) OR (((" & TableName & ".[Admin2])=" & CurrentClientID & ")) OR (((" & TableName & ".[Admin3])=" & CurrentClientID & ")) OR (((" & TableName & ".[Admin4])=" & CurrentClientID & "));"
Debug.Print(" sqlcommand = " & sqlcommand)
Dim getSomeData As New OleDbCommand(sqlcommand, dbConnection)
With getSomeData
.Parameters.AddWithValue("@variableName", "variableValue")
Debug.Print(" Executing: getSomeData")
End With
Debug.Print(" Success: getSomeData")
Debug.Print(" Try: DataReader")
Using dataReader As OleDbDataReader = getSomeData.ExecuteReader
Do While dataReader.Read
Dashboard_Client.ComboBox_PanelChoice.Items.Add(dataReader("PanelIP"))
Loop
End Using
End Using
PopCallStack() 'do not remove
Catch ex As Exception
GlobalErrHandler()
End Try
Debug.Print("LoadPanel End")
从调试面板:
LoadPanel:
dbConnection Success
Executing: getSomeData
Success: getSomeData
Try: DataReader
A first chance exception of type 'System.IndexOutOfRangeException' occurred in System.Data.dll
是否有办法解决此错误或进行变通以保留功能
谢谢。在这行
Dashboard_Client.ComboBox_PanelChoice.Items.Add(dataReader("PanelIP"))
您正试图读取名为PanelIP
的字段,但您的查询无法检索该字段。这会导致
索引自动失效异常
,因为在内部,读卡器会尝试将该名称(PanelIP)转换为检索字段列表中的一个位置,当该名称不存在时,则假定该位置为-1。当然,-1在检索的字段列表中是无效的索引
说,让我们看看你的查询以及如何修复它。 我希望TableName变量在您的严格控制之下,因为用户可以传递该变量中的任何内容,这可能导致一种称为Sql注入的危险情况
需要修复的是缺少的字段,并将currentClientID的每个字符串串联更改为适当的参数Dim sqlcommand = "SELECT " & TableName & ".[PanelName] " & _
TableName & ".[PanelID] " & _
" FROM " & TableName & _
" WHERE (" & TableName & ".[Owner])=@ownerID) " & _
" OR (" & TableName & ".[Admin1])=@clientID1) " & _
" OR (" & TableName & ".[Admin2])=@clientID2) " & _
" OR (" & TableName & ".[Admin3])=@clientID3) " & _
" OR (" & TableName & ".[Admin4])=@clientID4)"
Try
Using dbConnection As New OleDbConnection(.....)
Using getSomeData As New OleDbCommand(sqlcommand, dbConnection)
dbConnection.Open()
With getSomeData
' In oledb you need to add a parameter for every placeholder
' because the parameters are not recognized by name but by position
.Parameters.Add("@ownerID", OleDbType.Integer).Value = currentClientID
.Parameters.Add("@clientID1", OleDbType.Integer).Value = currentClientID
.Parameters.Add("@clientID2", OleDbType.Integer).Value = currentClientID
.Parameters.Add("@clientID3", OleDbType.Integer).Value = currentClientID
.Parameters.Add("@clientID4", OleDbType.Integer).Value = currentClientID
End With
Using dataReader As OleDbDataReader = getSomeData.ExecuteReader
Do While dataReader.Read
Dashboard_Client.ComboBox_PanelChoice.Items.Add(dataReader("PanelIP"))
Loop
End Using
End Using
End Using
PopCallStack()
Catch ex As Exception
GlobalErrHandler()
End Try
遗憾的是,无法同时参数化TableName,因为参数只能用于值,而不能用于字段或表名查询中没有
variableName
参数,您试图添加一个参数的值。这会导致indexootfrangeexception
您可以包含该参数,也可以删除该参数
.Parameters.AddWithValue("@variableName", "variableValue")
你能用
while
循环而不是do while
检查吗?刚刚尝试过,不幸地得到了同样的错误。谢谢,开发人员。查询中的variableName
parametr在哪里\我找不到,但您添加了一个参数??如果dataReader为emptySorry,do while可能会抛出错误,但这不会导致OP提到的错误。它只是被忽略。然而,我同意,在这个问题的背景下,它没有立足之地