SELECT * FROM planet_dev.plant_notice;
insert into plant_notice(content,image,class_id) value('哈哈哈','hehehehe',1);
update plant_notice set content='huhuhu' where content ='哈哈哈';
update plant_notice set deleted=1='huhuhu' where content ='哈哈哈';
delete from plant_notice where content='huhuhu'
数据库安全操作set SQL_SAFE_UPDATES = 0;