.net 紧凑框架中非常有趣的问题
向sqlce插入数据时出现性能问题。我正在读取字符串并向表中插入。在LUU MAM表中,我在8秒内插入了1000条记录。在MAM表之后,我插入了一些记录,但我最大的表是CR MUS。当我要将记录插入CR MUS时,这需要太多的时间。CR_MUS有2000条记录,插入需要35秒。原因是什么?我在插入函数中使用了相同的逻辑。你知道吗?我使用VS 2008 sp1.net 紧凑框架中非常有趣的问题,.net,sql-server-ce,.net,Sql Server Ce,向sqlce插入数据时出现性能问题。我正在读取字符串并向表中插入。在LUU MAM表中,我在8秒内插入了1000条记录。在MAM表之后,我插入了一些记录,但我最大的表是CR MUS。当我要将记录插入CR MUS时,这需要太多的时间。CR_MUS有2000条记录,插入需要35秒。原因是什么?我在插入函数中使用了相同的逻辑。你知道吗?我使用VS 2008 sp1 Dim reader As StringReader reader = New StringReader(data) cn = New
Dim reader As StringReader
reader = New StringReader(data)
cn = New SqlCeConnection(General.ConnString)
cn.Open()
If myTransfer.ClearTables(cn, cmd) = True Then
progress = 0
'------------------------------------------
cmd = New SqlServerCe.SqlCeCommand
Dim rs As SqlCeResultSet
cmd.Connection = cn
cmd.CommandType = CommandType.TableDirect
Dim rec As SqlCeUpdatableRecord
' name of table
While reader.Peek > -1
If strerr_col = "" Then
satir = reader.ReadLine()
ayrac = Split(satir, "|")
If ayrac(0).ToString() = "LC" Then
prgsbar.Maximum = Convert.ToInt32(ayrac(1))
ElseIf ayrac(0).ToString = "PPAR" Then
.
If ayrac(2).ToString <> General.PMVer Then
ShowWaitCursor(False)
txtDurum.Text = "Wrong Version"
Exit Sub
End If
If p_POCKET_PARAMETERS = True Then
cmd.CommandText = "POCKET_PARAMETERS"
txtDurum.Text = "POCKET_PARAMETERS"
rs = cmd.ExecuteResultSet(ResultSetOptions.Updatable)
rec = rs.CreateRecord()
p_POCKET_PARAMETERS = False
End If
strerr_col = myVERI_AL.POCKET_PARAMETERS_I(ayrac, cmd, rs, rec)
prgsbar.Value += 1
ElseIf ayrac(0).ToString() = "MAM" Then
If p_LU_MAM = True Then
txtDurum.Text = "LU_MAM "
cmd.CommandText = "LU_MAM"
rs = cmd.ExecuteResultSet(ResultSetOptions.Updatable)
rec = rs.CreateRecord()
p_LU_MAM = False
End If
strerr_col = myVERI_AL.LU_MAM_I(ayrac, cmd, rs, rec)
prgsbar.Value += 1
ElseIf ayrac(0).ToString = "KMUS" Then
If p_CR_MUS = True Then
cmd.CommandText = "CR_MUS"
txtDurum.Text = "CR_MUS"
rs = cmd.ExecuteResultSet(ResultSetOptions.Updatable)
rec = rs.CreateRecord()
p_TR_KAMPANYA_MALZEME = False
End If
strerr_col = myVERI_AL.CR_MUS_I(ayrac, cmd, rs, rec)
prgsbar.Value += 1
end while
好的,我发现了问题。我在CR_MUS中错了。我每次都吃CR_MUS,因为我没有使p_CR_MUS=false。而且增加progressbar值也会降低性能。所以现在我没有问题了
Try
rec.SetValue(0, If(f_Line(1) = String.Empty, DirectCast(DBNull.Value, Object), f_Line(1)))
rec.SetValue(1, If(f_Line(2) = String.Empty, DirectCast(DBNull.Value, Object), f_Line(2)))
rec.SetValue(2, If(f_Line(3) = String.Empty, DirectCast(DBNull.Value, Object), f_Line(3)))
rec.SetValue(3, If(f_Line(5) = String.Empty, DirectCast(DBNull.Value, Object), f_Line(5)))
rec.SetValue(4, If(f_Line(6) = String.Empty, DirectCast(DBNull.Value, Object), f_Line(6)))
rs.Insert(rec)
Catch ex As Exception
strerr_col = ex.Message
End Try
Return strerr_col
End Function