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 AX_Transaction()
 Specify a transaction activity
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 Syntax

     AX_Transaction( [<nTransactionState>] ) -> logical

     <nTransactionState>  An optional numeric value specifying the type
     of transaction operation to be performed. Valid <nTransactionState>
     values are:

     1 = Begin Transaction
     2 = Commit Transaction
     3 = Rollback Transaction
     No Value

 Returns

     If no parameter is passed to AX_Transaction(), then returns a .T. if
     user is currently in a transaction and a .F. if user is not currently
     in transaction. If <nTransactionState> is specified, returns the
     previous transaction state.

 Description

     This function is the main function for the Advantage TPS. All the
     transaction command statements, BEGIN TRANSACTION, COMMIT TRANSACTION
     and ROLLBACK TRANSACTION, pre-process into the AX_Transaction
     ( <nTransactionState> ) function.

     This function is best used to indicate whether a client is in a
     transaction or not, which is accomplished by passing no arguments to
     the function. To begin, commit, or rollback a transaction, use the
     commands and not the function. This course of action will minimize
     any re-coding efforts should the function in future TPS releases take
     extra parameters to accommodate new functionality.

 Example

     ? AX_Transaction()         // Returns .F.

     BEGIN TRANSACTION

        ? AX_Transaction()      // Returns .T.
        APPEND BLANK

     COMMIT TRANSACTION

     ? AX_Transaction()         // Returns .F.