PHP : Function Reference : IBM DB2, Cloudscape and Apache Derby Functions : db2_rollback PHP Examples Tutorials References

Example 951. Rolling back a DELETE statement

In the following example, we count the number of rows in a table, turn off AUTOCOMMIT mode on a database connection, delete all of the rows in the table and return the count of 0 to prove that the rows have been removed. We then issue db2_rollback() and return the updated count of rows in the table to show that the number is the same as before we issued the DELETE statement. The return to the original state of the table demonstrates that the roll back of the transaction succeeded.

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<?php

$conn = db2_connect($database, $user, $password);


if ($conn) {

    $stmt = db2_exec($conn, "SELECT count(*) FROM animals");

    $res = db2_fetch_array( $stmt );

    echo $res[0] . "\n";

    

    // Turn AUTOCOMMIT off

    db2_autocommit($conn, DB2_AUTOCOMMIT_OFF);

   

    // Delete all rows from ANIMALS

    db2_exec($conn, "DELETE FROM animals");

    

    $stmt = db2_exec($conn, "SELECT count(*) FROM animals");

    $res = db2_fetch_array( $stmt );

    echo $res[0] . "\n";

    

    // Roll back the DELETE statement

    db2_rollback( $conn );

    

    $stmt = db2_exec( $conn, "SELECT count(*) FROM animals" );

    $res = db2_fetch_array( $stmt );

    echo $res[0] . "\n";

    db2_close($conn);

}
?>

The above example will output:

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db2_rollback

Rolls back a transaction (PECL ibm_db2:1.0-1.6.2)
bool db2_rollback ( resource connection )

Example 951. Rolling back a DELETE statement

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db2_rollback

Rolls back a transaction (PECL ibm_db2:1.0-1.6.2) bool db2_rollback ( resource connection )

Example 951. Rolling back a DELETE statement

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Rolls back a transaction (PECL ibm_db2:1.0-1.6.2)
bool db2_rollback ( resource connection )