DBAccessBase.php

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<?php

abstract class DBAccessBase implements IDBAccessObject {
    protected $wiki = false;

    public function __construct( $wiki = false ) {
        $this->wiki = $wiki;
    }

    protected function getConnection( $id, $groups = array() ) {
        $loadBalancer = wfGetLB( $this->wiki );

        return $loadBalancer->getConnection( $id, $groups, $this->wiki );
    }

    protected function releaseConnection( DatabaseBase $db ) {
        if ( $this->wiki !== false ) {
            $loadBalancer = $this->getLoadBalancer();
            $loadBalancer->reuseConnection( $db );
        }
    }

    public function getLoadBalancer() {
        return wfGetLB( $this->wiki );
    }
}