public function getServerVersion()
    {
        if ($this->_serverVersion === null) {
            $this->_serverVersion = $this->db->getSlavePdo()->getAttribute(\PDO::ATTR_SERVER_VERSION);
        }
        return $this->_serverVersion;
    }
public function getServerVersion()
    {
        if ($this->_serverVersion === null) {
            $this->_serverVersion = $this->db->getSlavePdo()->getAttribute(\PDO::ATTR_SERVER_VERSION);
        }
        return $this->_serverVersion;
    }
public function getServerVersion ( ) { if ( $ this -> _serverVersion === null ) { $ this -> _serverVersion = $ this -> db -> getSlavePdo ( ) -> getAttribute ( \ PDO :: ATTR_SERVER_VERSION ) ; } return $ this -> _serverVersion ; }
Returns a server version as a string comparable by [[\version_compare()]].
@return string server version as a string.
@since 2.0.14
Returns a server version as a string comparable by [[ \ version_compare () ]] .