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    mysqli::autocommit

    mysqli_autocommit

    (PHP 5, PHP 7, PHP 8)

    mysqli::autocommit -- mysqli_autocommit — Turns on or off auto-committing database modifications

    Descrizione

    Stile orientato agli oggetti

    public mysqli::autocommit(bool $enable): bool

    Stile procedurale

    mysqli_autocommit(mysqli $mysql, bool $enable): bool

    Turns on or off auto-commit mode on queries for the database connection.

    To determine the current state of autocommit use the SQL command SELECT @@autocommit.

    Elenco dei parametri

    link

    Solo nello stile procedurale: un identificatore restituito da mysqli_connect() o mysqli_init()

    enable

    Whether to turn on auto-commit or not.

    Valori restituiti

    Restituisce true in caso di successo, false in caso di fallimento.

    Errori/Eccezioni

    If mysqli error reporting is enabled (MYSQLI_REPORT_ERROR) and the requested operation fails, a warning is generated. If, in addition, the mode is set to MYSQLI_REPORT_STRICT, a mysqli_sql_exception is thrown instead.

    Esempi

    Example #1 mysqli::autocommit() example

    Stile orientato agli oggetti

    <?php

    /* Tell mysqli to throw an exception if an error occurs */
    mysqli_report(MYSQLI_REPORT_ERROR | MYSQLI_REPORT_STRICT);

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

    /* The table engine has to support transactions */
    $mysqli->query("CREATE TABLE IF NOT EXISTS language (
    Code text NOT NULL,
    Speakers int(11) NOT NULL
    ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;"    );

    /* Turn autocommit off */
    $mysqli->autocommit(false);

    $result = $mysqli->query("SELECT @@autocommit");
    $row = $result->fetch_row();
    printf("Autocommit is %s\n", $row[0]);

    try {
    /* Prepare insert statement */
    $stmt = $mysqli->prepare('INSERT INTO language(Code, Speakers) VALUES (?,?)');
    $stmt->bind_param('ss', $language_code, $native_speakers);

    /* Insert some values */
    $language_code = 'DE';
    $native_speakers = 50_123_456;
    $stmt->execute();
    $language_code = 'FR';
    $native_speakers = 40_546_321;
    $stmt->execute();

    /* Commit the data in the database. This doesn't set autocommit=true */
    $mysqli->commit();
    print     "Committed 2 rows in the database\n";

    $result = $mysqli->query("SELECT @@autocommit");
    $row = $result->fetch_row();
    printf("Autocommit is %s\n", $row[0]);

    /* Try to insert more values */
    $language_code = 'PL';
    $native_speakers = 30_555_444;
    $stmt->execute();
    $language_code = 'DK';
    $native_speakers = 5_222_444;
    $stmt->execute();

    /* Setting autocommit=true will trigger a commit */
    $mysqli->autocommit(true);

    print     "Committed 2 row in the database\n";
    } catch (    mysqli_sql_exception $exception) {
    $mysqli->rollback();

    throw     $exception;
    }

    Stile procedurale

    <?php

    /* Tell mysqli to throw an exception if an error occurs */
    mysqli_report(MYSQLI_REPORT_ERROR | MYSQLI_REPORT_STRICT);

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

    /* The table engine has to support transactions */
    mysqli_query($mysqli, "CREATE TABLE IF NOT EXISTS language (
    Code text NOT NULL,
    Speakers int(11) NOT NULL
    ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;"    );

    /* Turn autocommit off */
    mysqli_autocommit($mysqli, false);

    $result = mysqli_query($mysqli, "SELECT @@autocommit");
    $row = mysqli_fetch_row($result);
    printf("Autocommit is %s\n", $row[0]);

    try {
    /* Prepare insert statement */
    $stmt = mysqli_prepare($mysqli, 'INSERT INTO language(Code, Speakers) VALUES (?,?)');
    mysqli_stmt_bind_param($stmt, 'ss', $language_code, $native_speakers);

    /* Insert some values */
    $language_code = 'DE';
    $native_speakers = 50_123_456;
    mysqli_stmt_execute($stmt);
    $language_code = 'FR';
    $native_speakers = 40_546_321;
    mysqli_stmt_execute($stmt);

    /* Commit the data in the database. This doesn't set autocommit=true */
    mysqli_commit($mysqli);
    print     "Committed 2 rows in the database\n";

    $result = mysqli_query($mysqli, "SELECT @@autocommit");
    $row = mysqli_fetch_row($result);
    printf("Autocommit is %s\n", $row[0]);

    /* Try to insert more values */
    $language_code = 'PL';
    $native_speakers = 30_555_444;
    mysqli_stmt_execute($stmt);
    $language_code = 'DK';
    $native_speakers = 5_222_444;
    mysqli_stmt_execute($stmt);

    /* Setting autocommit=true will trigger a commit */
    mysqli_autocommit($mysqli, true);

    print     "Committed 2 row in the database\n";
    } catch (    mysqli_sql_exception $exception) {
    mysqli_rollback($mysqli);

    throw     $exception;
    }

    I precedenti esempi visualizzeranno:

    Autocommit is 0
Committed 2 rows in the database
Autocommit is 0
Committed 2 row in the database
Autocommit is 0
Committed 2 rows in the database
Autocommit is 0
Committed 2 row in the database

    Note

    Nota:

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

    Vedere anche:

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    User Contributed Notes 4 notes

    up
    14
    Geoffrey Thubron
    17 years ago
    It's worth noting that you can perform transactions without disabling autocommit just using standard sql. "START TRANSACTION;" will start a transaction. "COMMIT;" will commit the results and "ROLLBACK;" will revert to the pre-transaction state.

    CREATE TABLE and CREATE DATABASE (and probably others) are always commited immediately and your transaction appears to terminate. Thus any commands before and after will be commited, even if a subsequent rollback is attempted.

    If you are in the middle of a transaction and you call mysqli_close() it appears that you get the funcitonality of an implicit rollback.

    I can't reproduce the "code bug causes lock" problem outlined below (I always get a successful rollback and the script will run umtine times successfully). Therefore, I would suggest that the problem is fixed in php-5.2.2.
    up
    18
    jcwebb at dicoe dot com
    17 years ago
    Just to be clear, autocommit not only turns on/off transactions, but will also 'commit' any waiting queries.
    <?php
    mysqli_autocommit    ($link, FALSE); // turn OFF auto
    -some query 1;
    -    some query 2;
    mysqli_commit($link); // process ALL queries so far
    -some query 3;
    -    some query 4;
    mysqli_autocommit($link, TRUE); // turn ON auto
    ?>
    All 4 will be processed.
    up
    2
    Glen
    17 years ago
    I've found that if PHP exits due to a code bug during a transaction, an InnoDB table can remain locked until Apache is restarted.

    The simple test is to start a transaction by setting $mysqli_obj->autocommit(false) and executing an insert statement.  Before getting to a $mysqli_obj->commit statement - have a runtime code bug bomb PHP.  You check the database, no insert happened (you assume a rollback occurred) .. and you go fix the bug, and try again... but this time the script takes about 50 seconds to timeout - the insert statement returning with a “1205 - Lock wait timeout exceeded; try restarting transaction”.  No rollback occurred. And this error will not go away until you restart Apache - for whatever reason, the resources are not released until the process is killed.

    I found that an ‘exit’, instead of a PHP code bug, will not cause a problem. So there is an auto-rollback mechanism in place - it just fails miserably when PHP dies unexpectantly. Having to restarting apache is a pretty drastic measure to overcome a code bug.

    To avoid this problem, I use “register_shutdown_function()” when I start a transaction, and set a flag to indicate a transaction is in process (because there is no unregister_shutdown_function()). See below. So the __shutdown_check() routine (I beleive it needs to be public) is called when the script bombs - which is able to invoke the rollback().

    these are just the relevant bits to give u an idea...

    <?php

    public function begin_transaction() {
          $ret = $this->mysqli_obj->autocommit(false);
          $this->transaction_in_progress = true;
          register_shutdown_function(array($this, "__shutdown_check"));
    }

    public function     __shutdown_check() {
      if (    $this->transaction_in_progress) {
            $this->rollback();
      }
    }

    public function     commit() {
          $ret = $this->mysqli_obj->commit();
          $this->transaction_in_progress = false;
    }

    public function     rollback() {
          $ret = $this->mysqli_obj->rollback();
          $this->transaction_in_progress = false;
    }
    ?>

    True for PHP 5.1.6 + MySQL 5.0.24a.
    up
    -8
    will at phpfever dot com
    18 years ago
    If you are using the mysql command line tool, here are some helpful hints for the autocommit feature:

    1.  To view the current autocommit setting, you can use this query: select @@autocommit;  It will return the current setting as 1 or 0 (on or off)

    2. You can manage the default autocommit feature in you my.cnf or my.ini by adding the following line: init_connect='set autocommit=0'.  I'm pretty sure this isn't in the documentation, but it does work.

    Here are the current engines, as of MySQL 5.1dev that support transactions:

    InnoDB
    BerkeleyDB
    Falcon

    Falcon is very new, so beware using it on production systems.
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