php pdo支持连接池吗
RT php想找合适的连接池,pdo支持吗
回复内容:
RT php想找合适的连接池,pdo支持吗
PHP不支持,PHP连接数据库是非常快的(比其他语言的数据库连接方式快很多),一般用直连就行了;pdo支持连接池。
不支持
有一个选项可以让你开启持久连接,然而你会发现到时候服务器连接大量没释放所以不推荐使用,你感兴趣可以试试
$dbh = new PDO('mysql:host=xxx;port=xxx;dbname=xxx', 'xxx', 'xxx', array( PDO::ATTR_PERSISTENT => true));
程序使用持久连接(PDO::ATTR_PERSISTENT)访问数据库,则一个PHP-FPM工作进程对应一个到MySQL的长连接.
请求结束后,PHP不会释放到MySQL的连接,以便下次重用,这个过程对程序是透明的.
这可以看作是PHP-FPM维护的"数据库连接池".
假如你的服务器有12个核心(超线程),你开启24个PHP-FPM工作进程.需要注意的是,PHP-FPM的进程数pm.max_children不要多于MySQL的最大连接数max_connections(默认151).
<code><?php $app = array( 'db_host' => '127.0.0.1', 'db_username' => 'root', 'db_password' => '', 'db_name' => 'mybase', 'db_port' => 3306, 'db_pconnect' => true ); $dsn = "mysql:dbname=$app[db_name];host=$app[db_host];port=$app[db_port];charset=utf8"; $db = new PDO($dsn, $app['db_username'], $app['db_password'], array( PDO::ATTR_PERSISTENT => $app['db_pconnect'], PDO::ATTR_EMULATE_PREPARES => false, PDO::MYSQL_ATTR_INIT_COMMAND => 'SET NAMES utf8' ));</code>
连接池得用mysql代理
可以使用swoole
扩展来实现。
具体参考: 基于swoole扩展实现真正的PHP数据库连接池
PDO加上ODBC就可以了

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