Microsoft KB Archive/107363

= FIX: Incorrect VB Error When Delete Index on Open Table =

Article ID: 107363

Article Last Modified on 1/8/2003

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APPLIES TO


 * Microsoft Visual Basic 3.0 Professional Edition

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This article was previously published under Q107363



SYMPTOMS
If you attempt to delete an index on an open table, you correctly get an error but the message is incorrect.

The program example given in the More Information section gives the following incorrect error when attempting to delete an index from an open Microsoft Access table:

ODBC-call failed.

This message is misleading because the program uses no ODBC. This is error number 3146, returned by the Err function.



CAUSE
The ODBC-call failed message is incorrect. The message should instead say the table is currently open and cannot be locked.

You cannot delete an index from a table if the table is Open. This is behavior is by design. You must be able to lock the table before you can delete an index. You cannot lock the table if the table is open by anyone.



WORKAROUND
Close the table before deleting an index. You may also need to use the Refresh method on the TableDefs collection before using the Delete method.



STATUS
Regarding the incorrect error message, Microsoft has confirmed this to be a bug in the Microsoft products listed at the beginning of this article. This problem has been corrected in Visual Basic version 4.0.

All other behavior described in this article is by design.



Steps to Reproduce Behavior
 Start a new project in Visual Basic. Form1 is created by default.  Add the following code to the Form Load event: Sub Form_Load

Const DB_LANG_GENERAL = ";LANGID=0x0809;CP=1252;COUNTRY=0" Dim db As database If Dir$("c:\t.mdb") <> "" Then Kill "c:\t.mdb" Set db = CreateDatabase("c:\t.mdb", DB_LANG_GENERAL)

Dim f1 As New field Dim f2 As New field f1.Name = "field1" f1.Type = 3 ' integer f2.Name = "field2" f2.Type = 3 ' integer

Dim td As New TableDef td.Name = "table1" td.Fields.Append f1     td.Fields.Append f2

Dim ix As New Index ix.Name = "index1" ix.Fields = "field1;field2" td.Indexes.Append ix

' create the table db.TableDefs.Append td

' add records to the table Dim tb As table Set tb = db.OpenTable("table1") tb.AddNew tb.Fields("field1").Value = 1 tb.Fields("field2").Value = 2 tb.Update tb.AddNew tb.Fields("field1").Value = 4 tb.Fields("field2").Value = 5 tb.Update tb.AddNew tb.Fields("field1").Value = 7 tb.Fields("field2").Value = 8 tb.Update

tb.Index = "index1" tb.Seek "=", 4, 5 Print tb.NoMatch Print tb.Fields("field1").Value

' Delete the index: Dim td2 As TableDef Set td2 = db.TableDefs("table1")

' The following line causes "ODBC-call failed" error message: td2.Indexes.Delete db.TableDefs("table1").Indexes("Index1").Name ' The workaround is to move this statement to after the table Close

tb.Close ' Workaround: move the statement from above to here: ' td2.Indexes.Delete db.TableDefs("table1").Indexes("Index1").Name db.Close

End Sub  Start the program or press the F5 key.

This program gives the incorrect error message "ODBC-call failed", err=3146, when attempting to delete an index from the Access database. This message is misleading because the program uses no ODBC.

To work around the problem, close the table before doing the Delete method.

NOTE: If the first data definition language (DDL) operation is a Delete method, the Delete will fail with the error, "Name not found in this collection." This is a separate bug and is explained in another article in the Microsoft Knowledge Base. To work around this bug, execute the db.TableDefs.Refresh method before attempting a Delete.

Additional query words: buglist3.00 3.00 erase remove how-to create fixlist4.00

Keywords: kbbug kbfix KB107363

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