ROLLBACK
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This document covers the following topics:
For an explanation of the symbols used in the syntax diagram, see Syntax Symbols.
Belongs to Function Group: Database Access and Update
See also ROLLBACK - SQL in the Natural for Db2 part of the Database Management System Interfaces documentation:
The SQL statement ROLLBACK corresponds to the Natural statement BACKOUT TRANSACTION. It undoes all database
modifications made since the beginning of the last recovery unit. A recovery unit may
start either after the beginning of a session or after the last SYNCPOINT,
COMMIT, END TRANSACTION or BACKOUT TRANSACTION statement. This statement
also releases all records held during the transaction.
If a program tries to backout updates which have already been committed by a terminal I/O, a corresponding Natural error message (NAT3711) is returned.
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Warning: As all cursors are closed when a logical unit of work ends, a ROLLBACK
statement must not be placed within a database modification loop; instead, it has to be
placed outside such a loop or after the outermost loop of nested loops. |
If an external program written in another standard programming language is called from a
Natural program, this external program should not contain its own ROLLBACK
statement if the Natural program issues database calls, too. The calling Natural program
should issue the ROLLBACK statement on behalf of the external program.
... DELETE FROM SQL-PERSONNEL WHERE NAME = 'SMITH' ROLLBACK ...