ROLLBACK (SQL)

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# ROLLBACK (SQL)

`ROLLBACK`

This document covers the following topics:

- Function

- Consideration for Non-Natural Programs

- Example

For an explanation of the symbols used in the syntax diagram, see Syntax Symbols.

Belongs to Function Group: Database Access and Update

## Function

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.

| 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.

## Consideration for Non-Natural Programs

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.

## Example

    ...
    DELETE FROM SQL-PERSONNEL WHERE NAME = 'SMITH'
    ROLLBACK
    ...

### On this page

- Function
- Consideration for Non-Natural Programs
- Example