function disconnect(cb) {
  _connection && _connection.release()

  _pool.end(cb)
}
/**
 * Closes the connection
 * @param {function} cb Callback called after connection closed
 */
Closes the connection
@param {function} cb Callback called after connection closed
Closes the connection @param { function } cb Callback called after connection closed
function disconnect(cb) {
  _connection && _connection.release()
  _pool.end(cb)
}
function disconnect ( cb ) { _connection && _connection . release ( ) _pool . end ( cb ) }
Closes the connection
 @param {function} cb Callback called after connection closed
Closes the connection @param { function } cb Callback called after connection closed