mysqli::rollback

mysqli_rollback

(PHP 5, PHP 7, PHP 8)

mysqli::rollback -- mysqli_rollback — Rolls back current transaction

Опис

Об'єктно-орієнтований стиль

public mysqli::rollback(int $flags = 0, ?string $name = null): bool

Процедурний стиль

mysqli_rollback(mysqli $mysql, int $flags = 0, ?string $name = null): bool

Rollbacks the current transaction for the database.

Параметри

mysql: Тільки процедурний стиль: об'єкт mysqli, якого повертає функція mysqli_connect() або mysqli_init()
flags: A bitmask of MYSQLI_TRANS_COR_* constants.
name: If provided then ROLLBACK/*name*/ is executed.

Значення, що повертаються

Повертає true у разі успіху або false в разі помилки.

Помилки/виключення

Якщо увімкнені звіти про помилки mysqli (MYSQLI_REPORT_ERROR) і запитана операція не виконалась, буде виведено попередження, але якщо встановлено режим MYSQLI_REPORT_STRICT, буде викинуто виключення mysqli_sql_exception.

Журнал змін

Версія	Опис
8.0.0	`name` is now nullable.

Приклади

See the mysqli::begin_transaction() example.

Примітки

Зауваження:
This function does not work with non transactional table types (like MyISAM or ISAM).

Прогляньте також

mysqli_begin_transaction() - Starts a transaction
mysqli_commit() - Commits the current transaction
mysqli_autocommit() - Turns on or off auto-committing database modifications
mysqli_release_savepoint() - Removes the named savepoint from the set of savepoints of the current transaction

Improve This Page

Learn How To Improve This Page • Submit a Pull Request • Report a Bug

＋add a note

User Contributed Notes 4 notes

down

Steven McCoy ¶

12 years ago

Remember that MyISAM tables do not support rollbacks.

I just drove myself crazy for an afternoon trying to figure out what was wrong with my code - meanwhile it was fine all along

down

Lorenzo - webmaster AT 4tour DOT it ¶

15 years ago

This is an example to explain the powerful of the rollback and commit functions.

Let's suppose you want to be sure that all queries have to be executed without errors before writing data on the database.

Here's the code:



<?php

$all_query_ok=true; // our control variable



//we make 4 inserts, the last one generates an error

//if at least one query returns an error we change our control variable

$mysqli->query("INSERT INTO myCity (id) VALUES (100)") ? null : $all_query_ok=false;

$mysqli->query("INSERT INTO myCity (id) VALUES (200)") ? null : $all_query_ok=false;

$mysqli->query("INSERT INTO myCity (id) VALUES (300)") ? null : $all_query_ok=false;

$mysqli->query("INSERT INTO myCity (id) VALUES (100)") ? null : $all_query_ok=false; //duplicated PRIMARY KEY VALUE



//now let's test our control variable

$all_query_ok ? $mysqli->commit() : $mysqli->rollback();



$mysqli->close();

?>



hope to be helpful!

down

Yorick Phoenix ¶

1 year ago

If you use savepoints  - eg savepoint($foo) - be wary of trying to rollback to the save point with rollback(0, $foo) as that executes "ROLLBACK /* $foo */" instead of "ROLLBACK TO `$foo`". 

The manual page is clear about this, but is easily overlooked.

Instead use: $mysqli->query("ROLLBACK TO `$foo`");

down

xcalibur at xcalibur dot dk ¶

14 years ago

Just a note about auto incremental ids and rollback.
When using transactions and inserting into a table containing a column with auto incremental ids, the id will be incremented even though the transaction is rolled back.

This might occupy a lot of ids if a lot of rollbacks are performed.

Example:
<?php
$mysqli = new mysqli("localhost", "gugbageri", "gugbageri", "gugbageri");

/* check connection */
if (mysqli_connect_errno()) {
    printf("Connect failed: %s\n", mysqli_connect_error());
    exit();
}

/* disable autocommit */
$mysqli->autocommit(FALSE);

/* We just create a test table with one auto incremental primary column and a content column*/
$mysqli->query("CREATE TABLE TestTable ( `id_column` INT NOT NULL  AUTO_INCREMENT , `content` INT NOT NULL , PRIMARY KEY ( `id_column` )) ENGINE = InnoDB;");

/* commit newly created table */
$mysqli->commit();

/* we insert a row */
$mysqli->query("INSERT INTO TestTable (content) VALUES (99)");

/* we commit the inserted row */
$mysqli->commit();

/* we insert another three rows */
$mysqli->query("INSERT INTO TestTable (content) VALUES (99)");
$mysqli->query("INSERT INTO TestTable (content) VALUES (99)");
$mysqli->query("INSERT INTO TestTable (content) VALUES (99)");

/* we the rollback */
$mysqli->rollback();

/* we insert a row */
$mysqli->query("INSERT INTO TestTable (content) VALUES (99)");

/* we commit the inserted row */
$mysqli->commit();

if ($result = $mysqli->query("SELECT id_column FROM TestTable")) {

   while($row = $result->fetch_row()) {
      printf("Id: %d.\n", $row[0]);
   }
    /* Free result */
    $result->close();
}

/* Drop table TestTable */
$mysqli->query("DROP TABLE TestTable");

$mysqli->close();
?>

This will output:
Id: 1.
Id: 5.

＋add a note