BACKOUT TRANSACTION

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# BACKOUT TRANSACTION

`BACKOUT` [`TRANSACTION`]

This document covers the following topics:

- BACKOUT TRANSACTION Usage

- BACKOUT TRANSACTION Restrictions

- Database-Specific Considerations for BACKOUT TRANSACTION

- BACKOUT TRANSACTION Example

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

Related Statements: `ACCEPT/REJECT` | `AT BREAK` | `AT START OF DATA` | `AT END OF DATA` | `BEFORE BREAK PROCESSING` | `DELETE` | `END TRANSACTION` | `FIND` | `GET` | `GET SAME` | `GET TRANSACTION DATA` | `HISTOGRAM` | `LIMIT` | `PASSW` | `PERFORM BREAK PROCESSING` | `READ` | `RETRY` | `STORE` | `UPDATE`

Belongs to Function Group: Database Access and Update

## BACKOUT TRANSACTION Usage

The `BACKOUT TRANSACTION` statement is used to back out all database updates performed during the current logical transaction. This statement also releases all records held during the transaction.

The statement is executed only if a database transaction under control of Natural has taken place. For which databases the statement is executed depends on the setting of the profile parameter `ET` (execution of `END/BACKOUT TRANSACTION` statements):

- If `ET=OFF`, the statement is executed only for the database affected by the transaction.

- If `ET=ON`, the statement is executed for all databases that have been referenced since the last execution of a `BACKOUT TRANSACTION` or `END TRANSACTION` statement.

### Backout Transaction Issued by Natural

If the user interrupts the current Natural operation with a terminal command (command `%%` or CLEAR key), Natural issues a `BACKOUT TRANSACTION` statement.

See also the terminal command `%%` in the Terminal Commands documentation.

### Additional Information

For additional information on the use of the transaction backout feature, see the sections Database Update - Transaction Processing and Backing Out a Transaction in the Programming Guide.

## BACKOUT TRANSACTION Restrictions

This statement is not available with Entire System Server.

## Database-Specific Considerations for BACKOUT TRANSACTION

SQL Databases | As most SQL databases close all cursors when a logical unit of work ends, a `BACKOUT TRANSACTION` statement must not be placed within a database modification loop; instead, it has to be placed after such a loop.
XML Databases | A `BACKOUT TRANSACTION` statement must not be placed within a database modification loop; instead, it has to be placed after such a loop.

## BACKOUT TRANSACTION Example

    ** Example 'BOTEX1': BACKOUT TRANSACTION
    **
    ** CAUTION: Executing this example will modify the database records!
    ************************************************************************
    DEFINE DATA LOCAL
    1 EMPLOY-VIEW VIEW OF EMPLOYEES
      2 NAME
      2 DEPT
      2 LEAVE-DUE
      2 LEAVE-TAKEN
    *
    1 #DEPT (A6)
    1 #RESP (A3)
    END-DEFINE
    *
    LIMIT 3
    INPUT 'DEPARTMENT TO BE UPDATED:' #DEPT
    IF #DEPT = ' '
      STOP
    END-IF
    *
    FIND EMPLOY-VIEW WITH DEPT = #DEPT
      IF NO RECORDS FOUND
        REINPUT 'NO RECORDS FOUND'
      END-NOREC
      INPUT 'NAME:       ' NAME (AD=O) /
            'LEAVE DUE:  ' LEAVE-DUE (AD=M) /
            'LEAVE TAKEN:' LEAVE-TAKEN (AD=M)
      UPDATE
    END-FIND
    *
    INPUT 'UPDATE TO BE PERFORMED? YES/NO:' #RESP
    DECIDE ON FIRST #RESP
      VALUE 'YES'
        END TRANSACTION
      VALUE 'NO'
        BACKOUT TRANSACTION
      NONE
        REINPUT 'PLEASE ENTER YES OR NO'
    END-DECIDE
    *
    END

#### Output of Program BOTEX1:

    DEPARTMENT TO BE UPDATED: MGMT30

Result for department `MGMT30`:

    NAME:        POREE
    LEAVE DUE:   45
    LEAVE TAKEN: 31

Confirmation query:

    UPDATE TO BE PERFORMED  YES/NO: NO

### On this page

- BACKOUT TRANSACTION Usage
- BACKOUT TRANSACTION Restrictions
- Database-Specific Considerations for BACKOUT TRANSACTION
- BACKOUT TRANSACTION Example