pdo_mysql-dsn(3) [php man page]
PDO_MYSQL-DSN(3) 1 PDO_MYSQL-DSN(3) PDO_MYSQL DSN - Connecting to MySQL databases The PDO_MYSQL Data Source Name (DSN) is composed of the following elements: o DSN prefix - The DSN prefix is mysql:. o host - The hostname on which the database server resides. o port - The port number where the database server is listening. o dbname - The name of the database. o unix_socket - The MySQL Unix socket (shouldn't be used with host or port). o charset - The character set. See the character set concepts documentation for more information. Prior to PHP 5.3.6, this element was silently ignored. The same behaviour can be partly replicated with the PDO::MYSQL_ATTR_INIT_COMMAND driver option, as the fol- lowing example shows. Warning The method in the below example can only be used with character sets that share the same lower 7 bit representation as ASCII, such as ISO-8859-1 and UTF-8. Users using character sets that have different representations (such as UTF-16 or Big5) must use the charset option provided in PHP 5.3.6 and later versions. Example #1 Setting the connection character set to UTF-8 prior to PHP 5.3.6 <?php $dsn = 'mysql:host=localhost;dbname=testdb'; $username = 'username'; $password = 'password'; $options = array( PDO::MYSQL_ATTR_INIT_COMMAND => 'SET NAMES utf8', ); $dbh = new PDO($dsn, $username, $password, $options); ?> +--------+-----------------------------------------------+ |Version | | | | | | | Description | | | | +--------+-----------------------------------------------+ | 5.3.6 | | | | | | | Prior to version 5.3.6, charset was ignored. | | | | +--------+-----------------------------------------------+ Example #2 PDO_MYSQL DSN examples The following example shows a PDO_MYSQL DSN for connecting to MySQL databases: mysql:host=localhost;dbname=testdb mysql:host=localhost;port=3307;dbname=testdb mysql:unix_socket=/tmp/mysql.sock;dbname=testdb Note Unix only: When the host name is set to "localhost", then the connection to the server is made thru a domain socket. If PDO_MYSQL is compiled against libmysqlclient then the location of the socket file is at libmysqlclient's compiled in location. If PDO_MYSQL is compiled against mysqlnd a default socket can be set thru the pdo_mysql.default_socket setting. PHP Documentation Group PDO_MYSQL-DSN(3)
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MYSQLND_MS_GET_LAST_USED_CONNECTION(3) 1 MYSQLND_MS_GET_LAST_USED_CONNECTION(3) mysqlnd_ms_get_last_used_connection - Returns an array which describes the last used connection SYNOPSIS
array mysqlnd_ms_get_last_used_connection (mixed $connection) DESCRIPTION
Returns an array which describes the last used connection from the plugins connection pool currently pointed to by the user connection handle. If using the plugin, a user connection handle represents a pool of database connections. It is not possible to tell from the user connection handles properties to which database server from the pool the user connection handle points. The function can be used to debug or monitor PECL mysqlnd_ms. PARAMETERS
o $connection - A MySQL connection handle obtained from any of the connect functions of the mysqli, mysql or PDO_MYSQL extensions. RETURN VALUES
FALSE on error. Otherwise, an array which describes the connection used to execute the last statement on. Array which describes the connection. +---------------+--------------------------------------+---+ | Property | | | | | | | | | Description | | | | | | | | Version | | | | | | +---------------+--------------------------------------+---+ | | | | | scheme | | | | | | | | | Connection scheme. Either | | | | tcp://host:port or | | | | unix://host:socket. If you want to | | | | distinguish connections from each | | | | other use a combination of scheme | | | | and thread_id as a unique key. Nei- | | | | ther scheme nor thread_id alone are | | | | sufficient to distinguish two con- | | | | nections from each other. Two | | | | servers may assign the same | | | | thread_id to two different connec- | | | | tions. Thus, connections in the pool | | | | may have the same thread_id. Also, | | | | do not rely on uniqueness of scheme | | | | in a pool. Your QA engineers may use | | | | the same MySQL server instance for | | | | two distinct logical roles and add | | | | it multiple times to the pool. This | | | | hack is used, for example, in the | | | | test suite. | | | | | | | | Since 1.1.0. | | | | | | | | | | | host | | | | | | | | | Database server host used with the | | | | connection. The host is only set | | | | with TCP/IP connections. It is empty | | | | with Unix domain or Windows named | | | | pipe connections, | | | | | | | | Since 1.1.0. | | | | | | | | | | | host_info | | | | | | | | | A character string representing the | | | | server hostname and the connection | | | | type. | | | | | | | | Since 1.1.2. | | | | | | | | | | | port | | | | | | | | | Database server port used with the | | | | connection. | | | | | | | | Since 1.1.0. | | | | | | | | | | |socket_or_pipe | | | | | | | | | Unix domain socket or Windows named | | | | pipe used with the connection. The | | | | value is empty for TCP/IP connec- | | | | tions. | | | | | | | | Since 1.1.2. | | | | | | | | | | | thread_id | | | | | | | | | Connection thread id. | | | | | | | | Since 1.1.0. | | | | | | | | | | | last_message | | | | | | | | | Info message obtained from the | | | | MySQL C API function mysql_info(). | | | | Please, see mysqli_info(3) for a | | | | description. | | | | | | | | Since 1.1.0. | | | | | | | | | | | errno | | | | | | | | | Error code. | | | | | | | | Since 1.1.0. | | | | | | | | | | | error | | | | | | | | | Error message. | | | | | | | | Since 1.1.0. | | | | | | | | | | | sqlstate | | | | | | | | | Error SQLstate code. | | | | | | | | Since 1.1.0. | | | | | | +---------------+--------------------------------------+---+ NOTES
Note mysqlnd_ms_get_last_used_connection(3) requires PHP >= 5.4.0 and PECL mysqlnd_ms >> 1.1.0. Internally, it is using a mysqlnd library C call not available with PHP 5.3. EXAMPLES
The example assumes that myapp refers to a plugin configuration file section and represents a connection pool. Example #1 mysqlnd_ms_get_last_used_connection(3) example <?php $link = new mysqli("myapp", "user", "password", "database"); $res = $link->query("SELECT 1 FROM DUAL"); var_dump(mysqlnd_ms_get_last_used_connection($link)); ?> The above example will output: array(10) { ["scheme"]=> string(22) "unix:///tmp/mysql.sock" ["host_info"]=> string(25) "Localhost via UNIX socket" ["host"]=> string(0) "" ["port"]=> int(3306) ["socket_or_pipe"]=> string(15) "/tmp/mysql.sock" ["thread_id"]=> int(46253) ["last_message"]=> string(0) "" ["errno"]=> int(0) ["error"]=> string(0) "" ["sqlstate"]=> string(5) "00000" } PHP Documentation Group MYSQLND_MS_GET_LAST_USED_CONNECTION(3)