JavaScript Editor Javascript debugger     Website design 

mysqli_rollback

Rolls back current transaction (PHP 5)
bool mysqli_rollback ( mysqli link )

mysqli {
  bool rollback();
}

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 1544. 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 1545. 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).