MySQL Functions (PDO_MYSQL)
簡介
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.
預設常數
以下常數由本驅動程式所定義，並且僅在該擴充功能被編譯入 PHP 或在執行時動態載入時可用。此外，這些驅動程式特定的常數應僅在使用此驅動程式被使用。在 Postgres 驅動下使用 MySQL 特定的屬性可能會導致不可預期的行為。在程式碼可以執行於多個驅動程式下時，可以用 PDO::getAttribute() 來取得 PDO_ATTR_DRIVER_NAME 屬性以檢查驅動程式。
- 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.