Tony Gardner
asked on
How to Correctly Define the CommandText and Parameters for an OleDb command Returning a Single Value
Hello Again Experts.
I am trying to return a single value from a data table using the following code:
The error being returned is
Note that there is an example of a known working SQL command in the comments of the Calc_PAT subroutine.
I guess I just need to figure out how to correctly define the CommandText and Parameters.
Any thoughts?
I am trying to return a single value from a data table using the following code:
Private Sub Calc_PAT()
' Calculate and Update Total/Match Points and Running Totals after each Match
'
' Note that table Scoring has been replaced with a simple String array (SL_P2W), and
' a new table called Scoring which contains what is needed for calculating Match Points.
'
' The following SQL command is an example of a query that would return the number of
' Match Points given to the loser with a Skill Level of 3, and their Total Points was 20:
' SELECT DISTINCT SL3 FROM Scoring GROUP BY LS, SL3 HAVING LS = 20;
Dim command_builder As New OleDbCommandBuilder(OleDbDataAdapterMatches)
Dim LsrMP As Int32 = 0, WnrMP As Int32 = 0, LsrNo As Int32 = IIf(TN = 1, 2, 1)
Dim LoserSL As Int32 = CInt(PT(SK, LsrNo).Text)
Dim SL_Clmn As String = "SL" & CStr(LoserSL)
Dim LoserTP As Int32 = CInt(PT(MP, LsrNo).Text)
Using con As New OleDbConnection(OleDbConnection.ConnectionString)
con.Open()
Using cmd As New OleDbCommand
cmd.Connection = con
cmd.CommandText = "SELECT DISTINCT ? FROM Scoring GROUP BY ?, " _
& SL_Clmn & " HAVING LS = " & PT(MP, LsrNo).Text & ";"
cmd.Parameters.Add(New OleDbParameter("@Param1", SL_Clmn))
cmd.Parameters.Add(New OleDbParameter("@Param2", LoserTP))
Try
LsrMP = cmd.ExecuteScalar()
Catch ex As OleDbException
MessageBox.Show(ex.Message)
End Try
End Using
End Using
WnrMP = 20 - LsrMP
PT(MP, TN).Text = CStr(WnrMP)
PT(MP, LsrNo).Text = CStr(LsrMP)
' Adjust Running Totals - Make sure we are updating the correct team
If PT(NO, TN).Text = PT(TN, P1).Text Then
PT(RT, P1).Text = CInt(PT(RT, P1).Text) + WnrMP
PT(RT, P2).Text = CInt(PT(RT, P2).Text) + LsrMP
Else
PT(RT, P1).Text = CInt(PT(RT, P1).Text) + LsrMP
PT(RT, P2).Text = CInt(PT(RT, P2).Text) + WnrMP
End If
End Sub
The error being returned is
You tried to execute a query that does not include the specified expression 'LS=0' as part of an aggregate function.
Note that there is an example of a known working SQL command in the comments of the Calc_PAT subroutine.
I guess I just need to figure out how to correctly define the CommandText and Parameters.
Any thoughts?
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