MySQL Query Error, sql: (SELECT sell_id,price,unit,property_sys_select,property_sys_input,img_path,imp_status,update_date FROM web_sell_1 WHERE sell_id IN(46355548,46497335,46356353,46495639,46355981,46495126,46356145,46496201,46495872,51328231,51362820,46497645)) 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 IN(10483530,55083811)) UNION (SELECT sell_id,price,unit,property_sys_select,property_sys_input,img_path,imp_status,update_date FROM web_sell_c WHERE sell_id IN(55896614,55794849,55686974,55534718)) UNION (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(52403594,51869384)), ErrMsg: MySQL server has gone away