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 );
        }
}