delete
delete
后加 where
删除指定记录,如果不加 where
,则删除全部记录。
单条删除
等同于DELETE from student_info where student_name = 'zhangsan'
多条删除
等同于DELETE from User where wo_no < 1024
delete_instance
删除给定的实例
delete_instance
直接执行删除了,不用调用execute()
方法。