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Connectors and APIs Manual  /  ...  /  mysqli::autocommit, mysqli_autocommit

7.3.8.2 mysqli::autocommit, mysqli_autocommit

Copyright 1997-2022 the PHP Documentation Group.

  • mysqli::autocommit

    mysqli_autocommit

    Turns on or off auto-committing database modifications

Description

Object-oriented style

public bool mysqli::autocommit(bool enable);

Procedural style

bool mysqli_autocommit(mysqli mysql,
                       bool enable);

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.

Parameters

mysql

Procedural style only: A mysqli object returned by mysqli_connect or mysqli_init

enable

Whether to turn on auto-commit or not.

Return Values

Returns true on success or false on failure.

Examples

Example 7.37 mysqli::autocommit example

Object-oriented style

<?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;
}

Procedural style

<?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;
}

The above examples will output:

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


Notes
Note

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

See Also

mysqli_begin_transaction
mysqli_commit
mysqli_rollback