PHP Manual
MySQL Functions (PDO_MYSQL)
Introduction
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.
Warning
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.
Installation
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.
Changelog
Version |
Description |
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 libmysql and OpenSSL.
|
Predefined Constants
The constants below are defined by
this driver, and will only be available when the extension has been either
compiled into PHP or dynamically loaded at runtime. In addition, these
driver-specific constants should only be used if you are using this driver.
Using driver-specific attributes with another driver may result in
unexpected behaviour. PDO::getAttribute() may be used to
obtain the PDO_ATTR_DRIVER_NAME attribute to check the
driver, if your code can run against multiple drivers.
-
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.
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.
This exists as of 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.
This exists as of PHP 5.3.7.
-
PDO::MYSQL_ATTR_SSL_CERT
(integer)
-
The file path to the SSL certificate.
This exists as of PHP 5.3.7.
-
PDO::MYSQL_ATTR_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
This exists as of PHP 5.3.7.
-
PDO::MYSQL_ATTR_KEY
(integer)
-
The file path to the SSL key.
This exists as of PHP 5.3.7.
Runtime Configuration
The behaviour of these functions is affected by settings in php.ini.
For further details and definitions of the
PHP_INI_* modes, see the Where a configuration setting may be set.
Here's a short explanation of
the configuration directives.
-
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.
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2009.05.13 10:05:21
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User: Forsaken
Registered: 2009.05.08 |
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