Re: Mysql Connector LEFT JOIN Bug
Posted by: René Kühne
Date: May 31, 2020 01:18AM

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Exactly, the problem you're having must be local to your setup.

That's why I tested with any setup I could think of on different machines.

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Ah, it's responding as if you'd specified CommandBehavior.SingleRow. Did you try other CommandBehavior settings?

No, tried only with default behavior.

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Does this happen if you don't override ExecuteReader?

Do you know someone in this forum whi might help/reproduce?

I created a blank app and put everything as basic as possible together. Added reference to connector 6.10.9.
Same result.

Private Sub Form1_Load(sender As Object, e As EventArgs) Handles MyBase.Load

    Dim mySQL As String = "select test1_ID, test2_test from test1 left join test2 on test1_ID = test2_test1_ID "

    Dim myConString =
        "Server=" & mServer &
        ";Uid=" & mUser &
        ";Password=" & mPass &
        ";Database=" & mDB & ";"

    Dim myCon As New MySqlConnection(myConString)
    myCon.Open()

    Dim myCommand As New MySqlCommand
    myCommand.Connection = myCon
    myCommand.CommandText = mySQL
    Dim myReader = myCommand.ExecuteReader()

    Dim myTable As New DataTable()
    myTable.Load(myReader)

    Debug.WriteLine(myTable.Rows.Count) '<- is 3 but should be 4

End Sub

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