ACC1x: Cannot Rollback in Transaction Without Closing Database

• Microsoft Access versions 1.0, 1.1

SYMPTOMS

A subroutine or a function contains a transaction process which calls a subroutine or function that dimensions and opens a database using the OpenDatabase method. When the subroutine or function exits, Microsoft Access implicitly closes the database (no Close method is called). When the subroutine or function attempts to execute the CommitTrans or Rollback statement, Microsoft Access displays the following message:

   Commit or Rollback without BeginTrans. 

CAUSE

When the called subroutine or function exits, Microsoft Access implicitly closes the database. Internally, the initial attempt to close the database fails because the database was opened in a transaction. Microsoft detects this error and performs an implicit transaction rollback, then it closes the database successfully.

RESOLUTION

To perform a Rollback in the called subroutine or function, you must first call the Close statement to close the open database.

STATUS

This behavior no longer occurs in Microsoft Access version 2.0.

MORE INFORMATION

Steps to Reproduce Behavior

1. Create the following module.
   

   
         '************************************************************
         'Declarations section of the module.
         '************************************************************
   
         Option Explicit
   
         '============================================================
         'The following Sub procedure starts a transaction, calls
         'another sub procedure, then attempts to rollback.
         '============================================================
         Sub Test1
            BeginTrans
               Call Test2
            Rollback
         End Sub
   
         '============================================================
         'The following Sub procedure sets a Database variable to
         'the current database.
         '============================================================
         Sub Test2
            Dim MyDB as Database
            Set MyDB = CurrentDB()
            'the database is implicitly closed on exit
         End Sub 




2. Compile the module.



3. In the Immediate window, enter Test1. Microsoft Access generates the following message:
   

   
         Commit or Rollback without BeginTrans. 

1. Perform Step 1 above.



2. Edit the second function to add MyDB.Close, as follows.

   
         '============================================================
         'The following Sub procedure will set a Database variable to
         'the current database, and then close the database.
         '============================================================
         Sub Test2
            Dim MyDB as Database
            Set MyDB = CurrentDB()
            MyDB.Close
         End Sub 




3. Compile the module.



4. In the Immediate window enter Test1. The Rollback works correctly because the code explicitly closes the database opened in the transaction.

Keywords : kbprg MdlTran
Version : 1.0 1.1
Platform : WINDOWS
Issue type : kbprb