mysqli::begin_transaction

    mysqli_begin_transaction

    (PHP 5 >= 5.5.0, PHP 7, PHP 8)

    mysqli::begin_transaction -- mysqli_begin_transaction — Starts a transaction

    Açıklama

    Nesne yönelimli kullanım

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

    Yordamsal kullanım:

    mysqli_begin_transaction(mysqli $mysql, int $flags = 0, ?string $name = null): 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.

    Bağımsız Değişkenler

    bağlantı

    Sadece yordamsal tarz: mysqli_connect() veya mysqli_init() işlevinden dönen bir mysqli nesnesi.

    flags

    Valid flags are:

    name

    Savepoint name for the transaction.

    Dönen Değerler

    Başarı durumunda true, başarısızlık durumunda false döner.

    Sürüm Bilgisi

    Sürüm: Açıklama
    8.0.0 name is now nullable.

    Örnekler

    Örnek 1 mysqli::begin_transaction() example

    Nesne yönelimli kullanım

    <?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;
    }

    Yordamsal kullanım

    <?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;
    }

    Notlar

    Bilginize:

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

    Ayrıca Bakınız

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    User Contributed Notes 3 notes

    up
    8
    Ral
    6 years ago
    If you receive errors like: "This server version doesn't support 'READ WRITE' and 'READ ONLY'. Minimum 5.6.5 is required" with versions of MariaDB that DO support them, this is due to an internal check in mysqli conflicting with a hack in MariaDB to allow replication with oracle mysql.

    MariaDB prefixes its server version numbers with "5.5.5-" for example "5.5.5-10.3.7-MariaDB-1:10.3.7+maria~stretch". This is because oracle mysql would interpet the "10" as version 1. Mysql clients aware of MariaDB have been updated to detect and strip this prefix.

    However the check for mysqli.begin-transaction sees the 5.5.5 prefix and so fails.

    The workaround is to specify a custom version string without the prefix for MariaDB on the command line using the --version option. Then mysqli.begin-transaction functions as expected.
    up
    0
    pep at gmail dot com
    2 days ago
    public function engadirPacente($pacente, $idsServizos)
    {
    try {
    $this->conexion->beginTransaction();

    $sql = 'INSERT INTO pacentes (nome, email, nacemento, alta) VALUES (:nome, :email, :nacemento, :alta)';
    $stm = $this->conexion->prepare($sql);
    $stm->bindParam('nome', $pacente->nome);
    $stm->bindParam('email', $pacente->email);
    $stm->bindParam('nacemento', $pacente->nacemento);
    $stm->bindParam('alta', $pacente->alta);
    $stm->execute();

    $idPacente = $this->conexion->lastInsertId();
    $sqlPibote = 'INSERT INTO pacente_servizo (pacente_id, servizo_id) VALUES (:pacente_id, :servizo_id)';
    $stmPibote = $this->conexion->prepare($sqlPibote);
    foreach ($idsServizos as $id) {
    $stmPibote->bindParam('pacente_id', $idPacente);
    $stmPibote->bindParam('servizo_id', $id);
    $stmPibote->execute();
    }

    $this->conexion->commit();
    } catch (PDOException $e) {
    $this->conexion->rollBack();
    echo "Error para engadir o pacente: " . $e->getMessage();
    }
    }

    public function borrarPacente($id)
    {
    try {
    $this->conexion->beginTransaction();

    $sqlPibote = 'DELETE FROM pacente_servizo WHERE pacente_id = :id';
    $stmPibote = $this->conexion->prepare($sqlPibote);
    $stmPibote->bindParam('id', $id);
    $stmPibote->execute();

    $sql = 'DELETE FROM pacentes WHERE id = :id';
    $stm = $this->conexion->prepare($sql);
    $stm->bindParam('id', $id);
    $stm->execute();

    $this->conexion->commit();
    } catch (PDOException $e) {
    $this->conexion->rollBack();
    echo "Error para borrar o pacente: " . $e->getMessage();
    }
    }
    }
    up
    0
    PHP Guru
    4 years ago
    MySQL 5.6 introduces READ ONLY mode which applies optimizations to your transactions that can only be applied when it knows in advance that no table modifications will be made and that no locks will be issued.

    The default access mode is READ WRITE in all versions up to and including MySQL 5.6. Starting in MySQL 5.7, the appropriate access mode is detected automatically. So if your transaction attempts modifications or table locks, it will automatically use READ WRITE mode, otherwise it will use READ ONLY mode and your transaction will benefit from the optimizations that come from that without having to explicitly declare is as READ ONLY.

    Therefore the only time you need to explicitly declare an access mode is when you are using MySQL 5.6 and you are sure that you want READ ONLY mode. Note that any queries that attempt to modify tables or issue locks in READ ONLY mode will fail. Temporary tables can still be modified.

    (Moderators. This post should replace the previous post that I made on the subject. Thanks.)
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