db2_rollback

db2_rollback

Rolls back a transaction

bool **db2_rollback** resource $connection

Rolls back an in-progress transaction on the specified connection resource and begins a new transaction. PHP applications normally default to AUTOCOMMIT mode, so normally has no effect unless AUTOCOMMIT has been turned off for the connection resource. db2_rollback

connection A valid database connection resource variable as returned from or . db2_connect``db2_pconnect

return.success

Voorbeeld: 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  to prove that the
rows have been removed. We then issue 
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.

0``db2_rollback

<?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);
}
?>

7
0
7

db2_autocommit``db2_commit