mysqli::begin_transaction

mysqli_begin_transaction

(PHP 5 >= 5.5.0, PHP 7)

mysqli::begin_transaction -- mysqli_begin_transaction — Starts a transaction

Description

Object oriented style

public mysqli::begin_transaction ([ int $flags = 0 [, string $name ]] ) : bool

Procedural style:

mysqli_begin_transaction ( mysqli $link [, int $flags = 0 [, string $name ]] ) : bool

Begins a transaction. Requires the InnoDB engine (it is enabled by default). For additional details about how MySQL transactions work, see » http://dev.mysql.com/doc/mysql/en/commit.html.

Parameters

link

Procedural style only: A link identifier returned by mysqli_connect() or mysqli_init()

flags

Valid flags are:

  • MYSQLI_TRANS_START_READ_ONLY: Start the transaction as "START TRANSACTION READ ONLY". Requires MySQL 5.6 and above.

  • MYSQLI_TRANS_START_READ_WRITE: Start the transaction as "START TRANSACTION READ WRITE". Requires MySQL 5.6 and above.

  • MYSQLI_TRANS_START_WITH_CONSISTENT_SNAPSHOT: Start the transaction as "START TRANSACTION WITH CONSISTENT SNAPSHOT".

name

Savepoint name for the transaction.

Return Values

Returns true on success or false on failure.

Notes

Note:

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

Examples

Example #1 mysqli::begin_transaction() 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;");

/* Start transaction */
$mysqli->begin_transaction();

try {
    /* Insert some values */
    $mysqli->query("INSERT INTO language(Code, Speakers) VALUES ('DE', 42000123)");

    /* Try to insert invalid values */
    $language_code = 'FR';
    $native_speakers = 'Unknown';
    $stmt = $mysqli->prepare('INSERT INTO language(Code, Speakers) VALUES (?,?)');
    $stmt->bind_param('ss', $language_code, $native_speakers);
    $stmt->execute();

    /* If code reaches this point without errors then commit the data in the database */
    $mysqli->commit();
} 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;");

/* Start transaction */
mysqli_begin_transaction($mysqli);

try {
    /* Insert some values */
    mysqli_query($mysqli, "INSERT INTO language(Code, Speakers) VALUES ('DE', 42000123)");

    /* Try to insert invalid values */
    $language_code = 'FR';
    $native_speakers = 'Unknown';
    $stmt = mysqli_prepare($mysqli, 'INSERT INTO language(Code, Speakers) VALUES (?,?)');
    mysqli_stmt_bind_param($stmt, 'ss', $language_code, $native_speakers);
    mysqli_stmt_execute($stmt);

    /* If code reaches this point without errors then commit the data in the database */
    mysqli_commit($mysqli);
} catch (mysqli_sql_exception $exception) {
    mysqli_rollback($mysqli);

    throw $exception;
}

See Also

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Licensed under the Creative Commons Attribution License v3.0 or later.
https://www.php.net/manual/en/mysqli.begin-transaction.php