code: public static ResultSet callQuery(Connection conn, String sql, Object... params) throws SQLException {
  		CallableStatement proc = null;
  		try {
  			proc = StatementUtil.prepareCall(conn, sql, params);
  			return proc.executeQuery();
  		} finally {
  			DbUtil.close(proc);
  		}
  	}
docs: 执行调用存储过程<br>
  此方法不会关闭Connection
  
  @param conn 数据库连接对象
  @param sql SQL
  @param params 参数
  @return ResultSet
  @throws SQLException SQL执行异常
  @since 4.1.4