Difference between revisions of "ROLLBACK()"

Revision as of 14:05, 2 June 2009

Class

Transaction Processing

Purpose

Function to verify success of a transaction rollback

Syntax

ROLLBACK()

See Also

BEGIN TRANSACTION, COMPLETED(), ISMARKED(), RESET IN, ROLLBACK, END TRANSACTION, SET ROLLBACK

Description

The ROLLBACK() function returns .T. if a rollback is successful and .F. if a rollback fails. This function is used in conjunction with the ROLLBACK command to determine if an attempted rollback and recovery was successful. Automatic rollback and recovery can be initiated within a BEGIN TRANSACTION...END TRANSACTION block with the SET ROLLBACK ON command.

Example

procedure recovery
  rollback
  if rollback()
      dialog box "Rollback was ok"
  else
      dialog box "Rollback not completed"
  endif
return
 
use masterfile
on error do recovery
begin transaction
    delete first 15
    replace all t1 with (t2*t3)/100
    list
end transaction
if completed()
    dialog box "Transaction completed"
    else
    dialog box "Errors occurred during transaction"
endif

Products

Recital Database Server, Recital Mirage Server, Recital Terminal Developer