MySQL Query Error, sql: (SELECT sell_id,price,unit,property_sys_select,property_sys_input,img_path,imp_status,update_date FROM web_sell_a WHERE sell_id IN(45798073,45798101)) 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 = 59743121 ) UNION (SELECT sell_id,price,unit,property_sys_select,property_sys_input,img_path,imp_status,update_date FROM web_sell_4 WHERE sell_id IN(4835852,60589930,60589929,60589928,60181771,60181770,60181769,60181768,60167801,60167800,60167799,60167798,60167797,60147828,60147827,60147826,60147825)), ErrMsg: MySQL server has gone away