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.
Use --with-pdo-mysql[=DIR] to install the PDO MySQL extension, where the optional [=DIR] is the MySQL base install directory. If mysqlnd is passed as [=DIR], then the MySQL native driver will be used.
Optionally, the --with-mysql-sock[=DIR] sets to location to the MySQL unix socket pointer for all MySQL extensions, including PDO_MYSQL. If unspecified, the default locations are searched.
Optionally, the --with-zlib-dir[=DIR] is used to set the path to the libz install prefix.
$ ./configure --with-pdo-mysql --with-mysql-sock=/var/mysql/mysql.sock
SSL support is enabled using the appropriate PDO_MySQL constants, which is equivalent to calling the » MySQL C API function mysql_ssl_set(). Also, SSL cannot be enabled with PDO::setAttribute because the connection already exists. See also the MySQL documentation about » connecting to MySQL with SSL.
| Versione | Descrizione |
|---|---|
| 5.4.0 | MySQL client libraries 4.1 and below are no longer supported. |
| 5.3.9 | Added SSL support with mysqlnd and OpenSSL. |
| 5.3.7 | Added SSL support with libmysqlclient and OpenSSL. |
Le costanti qui sotto sono definite da
questo driver, e sono disponibili solo quanto l'estensione è stata o
compilata nel PHP o caricata dinamicamente a runtime. In aggiunta, queste
costanti specifiche del driver dovrebbero essere usate solo se si sta usando il driver stesso.
Utilizzare attributi specifici di mysql con il driver postgres può portare a
risultati imprevedibili. PDO::getAttribute() può essere usata per
ottenere l'attributo PDO_ATTR_DRIVER_NAME per identificare il
driver, se il codice può funzionare con driver differenti.
PDO::MYSQL_ATTR_USE_BUFFERED_QUERY
(integer)
TRUE on a
PDOStatement, the MySQL driver will use the
buffered versions of the MySQL API. If you're writing portable code, you
should use PDOStatement::fetchAll() instead.
Example #1 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");
}
?>
PDO::MYSQL_ATTR_LOCAL_INFILE
(integer)
Enable LOAD LOCAL INFILE.
Note, this constant can only be used in the driver_options
array when constructing a new database handle.
PDO::MYSQL_ATTR_INIT_COMMAND
(integer)
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.
PDO::MYSQL_ATTR_READ_DEFAULT_FILE
(integer)
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.
PDO::MYSQL_ATTR_READ_DEFAULT_GROUP
(integer)
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.
PDO::MYSQL_ATTR_MAX_BUFFER_SIZE
(integer)
Maximum buffer size. Defaults to 1 MiB. This constant is not supported when compiled against mysqlnd.
PDO::MYSQL_ATTR_DIRECT_QUERY
(integer)
Perform direct queries, don't use prepared statements.
PDO::MYSQL_ATTR_FOUND_ROWS
(integer)
Return the number of found (matched) rows, not the number of changed rows.
PDO::MYSQL_ATTR_IGNORE_SPACE
(integer)
Permit spaces after function names. Makes all functions names reserved words.
PDO::MYSQL_ATTR_COMPRESS
(integer)
Enable network communication compression. This is not supported when compiled against mysqlnd.
PDO::MYSQL_ATTR_SSL_CA
(integer)
The file path to the SSL certificate authority.
Questo esiste dal PHP 5.3.7.
PDO::MYSQL_ATTR_SSL_CAPATH
(integer)
The file path to the directory that contains the trusted SSL CA certificates, which are stored in PEM format.
Questo esiste dal PHP 5.3.7.
PDO::MYSQL_ATTR_SSL_CERT
(integer)
The file path to the SSL certificate.
Questo esiste dal PHP 5.3.7.
PDO::MYSQL_ATTR_SSL_CIPHER
(integer)
A list of one or more permissible ciphers to use for SSL encryption, in a format understood by OpenSSL. For example: DHE-RSA-AES256-SHA:AES128-SHA
Questo esiste dal PHP 5.3.7.
PDO::MYSQL_ATTR_SSL_KEY
(integer)
The file path to the SSL key.
Questo esiste dal PHP 5.3.7.
Il comportamento di queste funzioni è influenzato dalle impostazioni di php.ini.
| Nome | Default | Modificabile |
|---|---|---|
| pdo_mysql.default_socket | "/tmp/mysql.sock" | PHP_INI_SYSTEM |
| pdo_mysql.debug | NULL | PHP_INI_SYSTEM |
Breve descrizione dei parametri di configurazione.
pdo_mysql.default_socket
string
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.
pdo_mysql.debug
boolean
Enables debugging for PDO_MYSQL. This setting is only available when PDO_MYSQL is compiled against mysqlnd and in PDO debug mode.