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多对多关联映射(单向)
多对多对象关系映射,需要加入一张新表完成基本映射。
Hibernate会自动生成中间表
Hibernate使用many-to-many标签来表示多对多的关联,多对多的关联映射,在实体类中,跟一对多一样,也是用集合来表示的。
如下图所示
通过User可以查看Role的信息
User的映射文件...
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系统相关 时间:
2014-08-05 09:38:49
阅读次数:
321
题目:
For Fans of Statistics
Time Limit:1000MS Memory Limit:65536KB 64bit IO Format:%I64d
& %I64
Description
Have you ever thought about how many people are transported...
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其他好文 时间:
2014-08-04 21:44:08
阅读次数:
381
G - For Fans of Statistics
Time Limit:1000MS Memory Limit:65536KB 64bit IO Format:%I64d
& %I64u
Submit Status
Description
Have you ever thought about how many people are tran...
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其他好文 时间:
2014-08-04 21:29:28
阅读次数:
318
How many waysTime Limit: 3000/1000 MS (Java/Others)Memory Limit: 32768/32768 K (Java/Others)Total Submission(s): 2762Accepted Submission(s): 1630Probl...
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其他好文 时间:
2014-08-04 21:12:27
阅读次数:
234
Although Model-View-Controller (MVC) is known by nearly every Web developer, how to properly use MVC in real application development still eludes many people. The central idea behind MVC is?code ...
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Web程序 时间:
2014-08-04 18:28:57
阅读次数:
349
题目:人生有很多选择,现在给你一些选择(0~n-1),和每个选择分支后面的其他选择序号,求选择总数。
分析:dp,图论。如果某状态的后续选择个数是0个则,代表死亡,统计所有到达死亡的路径条数即可。
用一个状态数组记录到达每个选择的路径数,它等于能到达它的前驱节点的路径加和。
稀疏图,使用邻接表储存。初始是节点0的路径条数为1,代表出生。
说明...
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其他好文 时间:
2014-08-04 17:53:57
阅读次数:
199
Background Many image file formats encode image data as a 2-D matrix or raster of pixel colors. The amount of available color information is fixed by ...
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编程语言 时间:
2014-08-03 20:33:25
阅读次数:
386
Wormholes
Time Limit: 2000MS
Memory Limit: 65536K
Total Submissions: 30766
Accepted: 11157
Description
While exploring his many farms, Farmer John has discovered a nu...
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其他好文 时间:
2014-08-02 18:30:23
阅读次数:
317
Given n, how many structurally unique BST's (binary search trees) that store values 1...n?
For example,
Given n = 3, there are a total of 5 unique BST's.
1 3 3 2 1
\ ...
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其他好文 时间:
2014-08-02 15:34:34
阅读次数:
221
AlertDialod like java awt dialog , when a event actived the activity will display a dialog , it can contain many views not only text or buttons ,here ...
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其他好文 时间:
2014-08-02 15:07:53
阅读次数:
208