PDO_MYSQL is a driver that implements the PHP Data Objects (PDO) interface to enable access from PHP to MySQL 3.x, 4.x and 5.x databases.
PDO_MYSQL will take advantage of native prepared statement support present in MySQL 4.1 and higher. If you're using an older version of the mysql client libraries, PDO will emulate them for you.
Beware: Some MySQL table types (storage engines) do not support transactions. When writing transactional database code using a table type that does not support transactions, MySQL will pretend that a transaction was initiated successfully. In addition, any DDL queries issued will implicitly commit any pending transactions.
Poniższe stałe są definiowane przez ten sterownik, i będą dostępne tylko, gdy to rozszerzenie będzie skompilowane z PHP lub załadowane dynamicznie przy starcie. Dodatkowo, te specyficzne dla sterownika stałe powinny być używane tylko przy użyciu tego konkretnego sterownika. Używanie atrybutów bazy MySQL przy użyciu sterownika PostgreSQL może prowadzić do nieprzewidzianego zachowania. Jeśli skrypt korzysta z wielu sterowników, do pobrania atrybutu PDO_ATTR_DRIVER_NAME, zawierającego nazwę sterownika, można zastosować funkcję PDO::getAttribute().
Przykład #3 Forcing queries to be buffered in mysql
<?php
if ($db->getAttribute(PDO::ATTR_DRIVER_NAME) == 'mysql') {
$stmt = $db->prepare('select * from foo',
array(PDO::MYSQL_ATTR_USE_BUFFERED_QUERY => true));
} else {
die("my application only works with mysql; I should use \$stmt->fetchAll() instead");
}
?>
Enable LOAD LOCAL INFILE.
Note, this constant can only be used in the driver_options array when constructing a new database handle.
Command to execute when connecting to the MySQL server. Will automatically be re-executed when reconnecting.
Note, this constant can only be used in the driver_options array when constructing a new database handle.
Read options from the named option file instead of from my.cnf. This option is not available if mysqlnd is used, because mysqlnd does not read the mysql configuration files.
Read options from the named group from my.cnf or the file specified with MYSQL_READ_DEFAULT_FILE. This option is not available if mysqlnd is used, because mysqlnd does not read the mysql configuration files.
Maximum buffer size. Defaults to 1 MiB. This constant is not supported when compiled against mysqlnd.
Perform direct queries, don't use prepared statements.
Return the number of found (matched) rows, not the number of changed rows.
Permit spaces after function names. Makes all functions names reserved words.
Enable network communication compression. This is not supported when compiled against mysqlnd.
Na działanie tych funkcji wpływają ustawienia zawarte w pliku php.ini.
Name | Default | Changeable |
---|---|---|
pdo_mysql.default_socket | "/tmp/mysql.sock" | PHP_INI_SYSTEM |
pdo_mysql.debug | NULL | PHP_INI_SYSTEM |
Oto krótkie wyjaśnienie dyrektyw konfiguracji.
Sets a Unix domain socket. This value can either be set at compile time if a domain socket is found at configure. This ini setting is Unix only.
Enables debugging for PDO_MYSQL. This setting is only available when PDO_MYSQL is compiled against mysqlnd and in PDO debug mode.