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PHP

Rolls back current transaction


mysqli::rollback

mysqli_rollback

(PHP 5)

mysqli::rollback -- mysqli_rollbackRolls back current transaction

Description

Object oriented style

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 mysqli::rollback() example

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();
?>

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($linkFALSE);

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 examples will output:

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

See Also



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