mysqli::begin_transaction

mysqli_begin_transaction

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

mysqli::begin_transaction -- mysqli_begin_transactionInicia una transacción

Descripción

Estilo orientado a objetos

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

Estilo por procedimientos:

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

Inicia una transacción. Requiere el motor InnoDB (está activo por omisión). Para más detalles sobre el funcionamiento de las transacciones MySQL, ver » http://dev.mysql.com/doc/mysql/en/commit.html.

Parámetros

link

Sólo estilo por procediminetos: Un identificador de enlace devuelto por mysqli_connect() o mysqli_init()

flags

Los flag válidos son:

name

Nombre del punto de guardado para la transacción.

Valores devueltos

Devuelve true en caso de éxito o false en caso de error.

Historial de cambios

Versión Descripción
8.0.0 name ahora es nullable.

Ejemplos

Ejemplo #1 Ejemplo con mysqli::begin_transaction()

Estilo orientado a objetos

<?php

/* Indica a mysqli que lance una excepción si ocurre un error */
mysqli_report(MYSQLI_REPORT_ERROR | MYSQLI_REPORT_STRICT);

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

/* El motor de tabla soporta transacciones */
$mysqli->query("CREATE TABLE IF NOT EXISTS language (
Code text NOT NULL,
Speakers int(11) NOT NULL
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;"
);

/* Inicia la transacción */
$mysqli->begin_transaction();

try {
/* Inserta varios valores */
$mysqli->query("INSERT INTO language(Code, Speakers) VALUES ('DE', 42000123)");

/* Intenta insertar valores incorrectos */
$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();

/* Si el código llega a este punto sin errores, entonces se confirman los datos en
la base de datos */
$mysqli->commit();
} catch (
mysqli_sql_exception $exception) {
$mysqli->rollback();

throw
$exception;
}

Estilo por procedimientos

<?php

/* Indica a mysqli que lance una excepción si ocurre un error */
mysqli_report(MYSQLI_REPORT_ERROR | MYSQLI_REPORT_STRICT);

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

/* El motor de tabla soporta transacciones */
mysqli_query($mysqli, "CREATE TABLE IF NOT EXISTS language (
Code text NOT NULL,
Speakers int(11) NOT NULL
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;"
);

/* Inicia la transacción */
mysqli_begin_transaction($mysqli);

try {
/* Inserta varios valores */
mysqli_query($mysqli, "INSERT INTO language(Code, Speakers) VALUES ('DE', 42000123)");

/* Intenta insertar valores incorrectos */
$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);

/* Si el código llega a este punto sin errores, entonces se confirman los datos en
la base de datos */
mysqli_commit($mysqli);
} catch (
mysqli_sql_exception $exception) {
mysqli_rollback($mysqli);

throw
$exception;
}

Notas

Nota:

Esta función no funciona con tipos de tabla no transaccionales (como MyISAM o ISAM).

Ver también

add a note

User Contributed Notes 2 notes

up
8
Ral
7 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.
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0
PHP Guru
5 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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