MySQL Query Error, sql: (SELECT sell_id,price,unit,property_sys_select,property_sys_input,img_path,imp_status,update_date FROM web_sell_c WHERE sell_id = 57149913 ) UNION (SELECT sell_id,price,unit,property_sys_select,property_sys_input,img_path,imp_status,update_date FROM web_sell_2 WHERE sell_id = 28406056 ) UNION (SELECT sell_id,price,unit,property_sys_select,property_sys_input,img_path,imp_status,update_date FROM web_sell_7 WHERE sell_id IN(44079966,44080156,44079680,44081217,44081644,44081469,37533779,37425087,37535135,37642598,37648101,37451171,38067997,38068565,37994802,38068606,38068550,38067775)), ErrMsg: MySQL server has gone away