code: public PooledConnection getConnection(long wait) throws SQLException {
  		try {
  			return getConnectionDirect();
  		} catch (Exception e) {
  			ThreadUtil.sleep(wait);
  		}
  		return getConnectionDirect();
  	}
docs: 获取连接对象
  
  @param wait 当池中无连接等待的毫秒数
  @return 连接对象
  @throws SQLException SQL异常