PDO_INFORMIX DSN
PDO_MYSQL DSN
PDO-Treiber
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# MySQL Functions (PDO_MYSQL)

## Einführung

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.

Warnung

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 | Beschreibung
--- | ---
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.

## Vordefinierte Konstanten

Die folgenden Konstanten werden vom Treiber definiert und sind nur verfügbar, wenn die Extension entweder in PHP einkompiliert oder dynamisch zur Laufzeit geladen wurde. Weiterhin sind diese Konstanten treiberspezifisch und sollten nur mit diesem Treiber benutzt werden. MySQL-spezifische Attribute mit dem PostgreSQL Treiber zu nutzen, kann zu unerwarteten Ergebnissen führen. Kann Ihr Code mit verschiedenen Treibern arbeiten, so können Sie PDO::getAttribute() benutzen, um mit `PDO_ATTR_DRIVER_NAME` den aktuellen Treiber zu ermitteln.

`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.

  Beispiel #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.

  Dies existiert seit 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.

  Dies existiert seit PHP 5.3.7.

`PDO::MYSQL_ATTR_SSL_CERT` (integer)

  The file path to the SSL certificate.

  Dies existiert seit 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

  Dies existiert seit PHP 5.3.7.

`PDO::MYSQL_ATTR_SSL_KEY` (integer)

  The file path to the SSL key.

  Dies existiert seit PHP 5.3.7.

## Laufzeit-Konfiguration

Das Verhalten dieser Funktionen wird durch Einstellungen in der php.ini beeinflusst.

PDO_MYSQL Configuration Options
Name | Standard | Veränderbar
--- | --- | ---
pdo_mysql.default_socket | "/tmp/mysql.sock" | PHP_INI_SYSTEM
pdo_mysql.debug | NULL | PHP_INI_SYSTEM

Weitere Details und die Definitionen der PHP_INI_*-Konstanten finden Sie im Wo Konfigurationseinstellungen gesetzt werden können.

Hier eine kurze Erklärung der Konfigurationsoptionen:

`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.

## Inhaltsverzeichnis

- PDO_MYSQL DSN — Connecting to MySQL databases

PDO_INFORMIX DSN
PDO_MYSQL DSN
PDO-Treiber
PHP Manual