Oracle 5.0 Reference Manual page 2434

Rolls back current transaction
Description
Object oriented style
bool mysqli::rollback();
Procedural style
bool mysqli_rollback(
mysqli link);
Rollbacks the current transaction for the database.
Parameters
link
Return Values
Returns on success or
TRUE
Examples
Example 20.140.
mysqli::rollback
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]);
MySQL Improved Extension (Mysqli)
Procedural style only: A link identifier returned by
mysqli_connect
on failure.
FALSE
example
2414
or
mysqli_init