SQL/MX 2.x Reference Manual (H06.04+)

SQL/MX Statements
HP NonStop SQL/MX Reference Manual—540440-003
2-173
C Examples of ROLLBACK WORK
ROLLBACK WORK;
ROLLBACK WORK cancels the inserts that occurred during the transaction and
releases the locks held on ORDERS and ODETAIL.
C Examples of ROLLBACK WORK
•
Start a transaction, execute an UPDATE statement, and test SQLSTATE. If the
UPDATE is successful, the database changes are committed. Otherwise, the
database changes are rolled back.
...
char SQLSTATE_OK[6] = "00000";
EXEC SQL BEGIN DECLARE SECTION;
char SQLSTATE[6];
...
EXEC SQL END DECLARE SECTION;
...
EXEC SQL BEGIN WORK; /* Start a transaction. */
...
EXEC SQL UPDATE ... ; /* Change the database. */
...
if (strcmp(SQLSTATE, SQLSTATE_OK) == 0)
EXEC SQL COMMIT WORK; /* Commit the changes. */
else
EXEC SQL ROLLBACK WORK; /* Roll back the changes. */
COBOL Examples of ROLLBACK WORK
•
Start a transaction, execute an UPDATE statement, and test SQLSTATE. If the
UPDATE is successful, the database changes are committed. Otherwise, the
database changes are rolled back.
...
01 SQLSTATE_OK PIC X(5) VALUE "00000".
EXEC SQL BEGIN DECLARE SECTION END-EXEC.
01 SQLSTATE PIC X(5).
...
EXEC SQL END DECLARE SECTION END-EXEC.
...
EXEC SQL BEGIN WORK END-EXEC.
...
EXEC SQL UPDATE ... END-EXEC.
...
IF SQLSTATE = SQLSTATE_OK
EXEC SQL COMMIT WORK END-EXEC.
ELSE
EXEC SQL ROLLBACK WORK END-EXEC.
END-IF.