mysqli::rollback

mysqli_rollback

(PHP 5)

mysqli_rollback — Rolls back current transaction

Description

Object oriented style (method):

bool mysqli::rollback ( void )

Procedural style:

bool mysqli_rollback ( mysqli $link )

Rollbacks the current transaction for the database.

Parameters

link: Procedural style only: A link identifier returned by mysqli_connect() or mysqli_init()

Return Values

Returns TRUE on success or FALSE on failure.

Examples

Example #1 Object oriented style


<?php

$mysqli = new mysqli("localhost", "my_user", "my_password", "world");



/* check connection */

if (mysqli_connect_errno()) {

    printf("Connect failed: %s\n", mysqli_connect_error());

    exit();

}



/* disable autocommit */

$mysqli->autocommit(FALSE);



$mysqli->query("CREATE TABLE myCity LIKE City");

$mysqli->query("ALTER TABLE myCity Type=InnoDB");

$mysqli->query("INSERT INTO myCity SELECT * FROM City LIMIT 50");



/* commit insert */

$mysqli->commit();



/* delete all rows */

$mysqli->query("DELETE FROM myCity");



if ($result = $mysqli->query("SELECT COUNT(*) FROM myCity")) {

    $row = $result->fetch_row();

    printf("%d rows in table myCity.\n", $row[0]);

    /* Free result */

    $result->close();

}



/* Rollback */

$mysqli->rollback();



if ($result = $mysqli->query("SELECT COUNT(*) FROM myCity")) {

    $row = $result->fetch_row();

    printf("%d rows in table myCity (after rollback).\n", $row[0]);

    /* Free result */

    $result->close();

}



/* Drop table myCity */

$mysqli->query("DROP TABLE myCity");



$mysqli->close();

?>

Example #2 Procedural style


<?php

$link = mysqli_connect("localhost", "my_user", "my_password", "world");



/* check connection */

if (mysqli_connect_errno()) {

    printf("Connect failed: %s\n", mysqli_connect_error());

    exit();

}



/* disable autocommit */

mysqli_autocommit($link, FALSE);



mysqli_query($link, "CREATE TABLE myCity LIKE City");

mysqli_query($link, "ALTER TABLE myCity Type=InnoDB");

mysqli_query($link, "INSERT INTO myCity SELECT * FROM City LIMIT 50");



/* commit insert */

mysqli_commit($link);



/* delete all rows */

mysqli_query($link, "DELETE FROM myCity");



if ($result = mysqli_query($link, "SELECT COUNT(*) FROM myCity")) {

    $row = mysqli_fetch_row($result);

    printf("%d rows in table myCity.\n", $row[0]);

    /* Free result */

    mysqli_free_result($result);

}



/* Rollback */

mysqli_rollback($link);



if ($result = mysqli_query($link, "SELECT COUNT(*) FROM myCity")) {

    $row = mysqli_fetch_row($result);

    printf("%d rows in table myCity (after rollback).\n", $row[0]);

    /* Free result */

    mysqli_free_result($result);

}



/* Drop table myCity */

mysqli_query($link, "DROP TABLE myCity");



mysqli_close($link);

?>

The above example will output:

0 rows in table myCity.
50 rows in table myCity (after rollback).