MySQL Query Error, sql: (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(59742990,59742945,52566469,52566458,51205196)) UNION (SELECT sell_id,price,unit,property_sys_select,property_sys_input,img_path,imp_status,update_date FROM web_sell_8 WHERE sell_id IN(38356942,38356800,38357104,38357247,38357315,38357473,40655035)) UNION (SELECT sell_id,price,unit,property_sys_select,property_sys_input,img_path,imp_status,update_date FROM web_sell_e WHERE sell_id IN(38033417,38097658,38109734,38122409,38105277,38345203,38639567)) UNION (SELECT sell_id,price,unit,property_sys_select,property_sys_input,img_path,imp_status,update_date FROM web_sell_6 WHERE sell_id = 26916215 ), ErrMsg: MySQL server has gone away