刷机后显示on delete no actionn 怎么办

来源：蜘蛛抓取(WebSpider) 时间：2017-05-22 11:29 标签： restrict no action
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用svn检出spring（trunk）源码项目后，点击Build path出现No action available的提示（空），在网上搜到一篇文章，解决了问题！
在项目里面找到.project ，写入
&&nature&org.eclipse.jdt.core.javanature&/nature&
&/natures&（我写的时候加入&nature&org.eclipse.jdt.core.javanature&/nature&就可以了）
这样就行了，简单的记录一下里面各种属性：
1.工程名：&name&&/name&
2.工程注释描述：&comment&&/comment&
3.Eclipse插件：&natures&&/natures&
4.加载方式：&buildSpec&&/buildSpec&
而org.eclipse.jdt.core.javanature 是Java Development & &Toolkit &的插件，很多JAVA API 等信息，都需要这个进行关联。
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oracle中的on delete no action怎么用？
论坛徽章:0
我使用的版本是10g的第一版，执行以下代码，报错了，不知道是不是语法写的不对，向好心人请教。
& &create table test(
& &id integer default 1 not null,
& &name varchar2(50)
& &Table created.
&&create table test2(
&&id integer not null,
&&p_id integer not null references test(id) on delete no action
& &p_id integer not null references test(id) on delete no action
& && && && && && && && && && && && && && && && && & *
& &ERROR at line 3:
& &ORA-00905: missing keyword
如果想要主表中删除时，从表不变化，应该怎样写外键约束？ 谢谢
认证徽章论坛徽章:131
on delete&&setnull
论坛徽章:64
• ON DELETE CASCADE indicates that when the row in the parent table is deleted, the dependent
rows in the child table will also be deleted.
• ON DELETE SET NULL converts foreign key values to null when the parent value is removed.
The default behavior is called the restrict rule, which disallows the update or deletion of referenced data.
Without the ON DELETE CASCADE or the ON DELETE SET NULL options, the row in the parent table cannot be deleted if it is referenced in the child table.
用约束控制从表不变化好像不行吧,等高人支招
论坛徽章:0
可是项目要求，从表的参考字段不能为空，所以使用 on delete set&&null 行不通啊
还有没有别的好办法啊！
论坛徽章:64
主表信息不存在了,要子表信息干什么,奇怪,可能是特殊需求吧,
建触发器,把从表信息写到别的表里保存,然后删除
认证徽章论坛徽章:50
我怎么不知道有这样的用法啊,是10G中特有的写法吗
认证徽章论坛徽章:131
最初由 machines 发布
[B]可是项目要求，从表的参考字段不能为空，所以使用 on delete set&&null 行不通啊
还有没有别的好办法啊！ [/B]
那就不能使用外健约束了
认证徽章论坛徽章:50
我怎么不知道有这样的用法啊,是10G中特有的写法吗
谁能回答我一下,谢谢!
论坛徽章:107
10G 以前就有了.&&on delete set null
& && && && && && && && && && & on delete cascade
如果在建外键的时候，不加任何&&默认就是 on delete no action
论坛徽章:304
最初由 skelly_huang 发布
[B]10G 以前就有了.&&on delete set null
& && && && && && && && && && & on delete cascade
如果在建外键的时候，不加任何&&默认就是 on delete no action [/B]
我没见on delete no action 的情况，不知当这种情况发生后，
外键约束是validate 的还是 novalidate ？
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