3.9.3 mysqli::begin_transaction, mysqli_begin_transaction

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• mysqli::begin_transaction

  mysqli_begin_transaction

  Starts a transaction

Description

Object oriented style

public bool mysqli::begin_transaction(int flags= =0,
                                      string name);

Procedural style:

bool mysqli_begin_transaction(mysqli link,
                              int flags= =0,
                              string name);

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 3.33 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

mysqli_autocommit

mysqli_commit

mysqli_rollback