MySQL Functions (PDO_MYSQL)
Introduzione
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.
Costanti predefinite
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)
-
If this attribute is set to 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.
- PDO::MYSQL_ATTR_INIT_COMMAND (integer)
-
Command to execute when connecting to the MySQL server. Will automatically be re-executed when reconnecting.
- PDO::MYSQL_ATTR_READ_DEFAULT_FILE (integer)
-
Read options from the named option file instead of from my.cnf.
- 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.
- PDO::MYSQL_ATTR_MAX_BUFFER_SIZE (integer)
-
Maximum buffer size. Defaults to 1 MiB.
- PDO::MYSQL_ATTR_DIRECT_QUERY (integer)
-
Perform direct queries, don't use prepared statements.