How To Get More Information on the ODBC Call Failed Error

MORE INFORMATION

The DBEngine has an Errors collection that can be manipulated by the FOR- EACH construct. The JET Engine can store multiple errors in the DBEngine Errors collection. In Visual Basic 3.0, it was possible to parse the string using the routine shown on Page 175 of the Visual Basic 4.0 Professional Features Book under the "Guide to Data Access Objects" section. The # symbol was used to separate the "ODBC Call Failed" message from the detailed ODBC description in Visual Basic 3.0 but this is not necessary under Visual Basic 4.0.

For the example below, a two-field table called MyTable has been set up on an ODBC Source and a primary key set on the ID Field. Two records have been added as below:

   Field      ID      Description
   ===============================
   Record 1    1      Hello
   Record 2    2      World
				

The code below will generate an error by trying to add a record with a duplicate primary key value to test the code:

1. Start a new project in Visual Basic. Form1 is created by default.
2. Add a Command button to Form1.
3. Add the following code to the General Declarations section of Form1:

      Option Explicit
   
      Private Sub Command1_Click()
        Dim db As Database
        Dim rs As Recordset
        On Error GoTo trap:
        Set db = OpenDatabase("")
        Set rs = db.OpenRecordset("Select * from MyTable")
        rs.AddNew
          rs.Fields(0).Value = 2
        rs.Update
        Exit Sub
      trap:
        MsgBox Errors.Count
        MsgBox Err.Number & " " & Err.Description
      End Sub
   
   						

4. Press the F5 key to run the project. Click on the Command button and you should receive Error message 3146 stating "ODBC Call Failed." Although the Error count is greater than one, only one message will be displayed.
5. Remove the code from within the error trap and replace it with the following code:

      Dim MyError As Error
      MsgBox Errors.Count
      For Each MyError In DBEngine.Errors
        With MyError
          MsgBox .Number & " " & .Description
        End With
      Next MyError
   
   						

6. Press the F5 key to run the project. You should see a detailed message and then the 3146 Error for "ODBC Call Failed."