1、assigned主键由外部程序负责生成，在save()之前必须指定一个。Hibernate不负责维护主键生成。与Hibernate和底层数据库都无关，可以跨数据库。在存储对象前，必须要使用主键的setter方法给主键赋值，至于这个值怎么生成，完全由自己决定，这种方法应该尽量避免。“ud”是自定义...
分类：
Web程序 时间：
2015-09-10 01:50:23
阅读次数：
250
1.Database configurationCreate a new test user, a new database and a single test table. Your MySQL usermusthave a password assigned. The driver will f...
分类：
数据库 时间：
2015-09-04 11:09:11
阅读次数：
247
QTREE2 - Query on a tree II
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You are given a tree (an undirected acyclic connected graph) with N nodes, and edges numbered 1, 2, 3...N-1. Each edge has an integer value
assigned ...
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其他好文 时间：
2015-08-27 02:14:59
阅读次数：
238
org.hibernate.id.IdentifierGenerationException: ids for this class must be manually assigned before calling save(): com.zh.hibernate.subclass.Person a...
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Web程序 时间：
2015-08-17 19:16:17
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258
133.You created a profile APP_USER and assigned it to the users. After a month, you decide to drop theprofile. Some user sessions are currently connec...
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移动开发 时间：
2015-08-15 16:20:29
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119
?Value Stewardship Over ShowmanshipBarry HawkinsWHEn An ARCHiTECT EnTERS A pRojECT, there is an understandable desire to prove his or her worth. Being assigned the role of software architect typically...
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其他好文 时间：
2015-08-14 09:59:08
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145
A table tennis club has N tables available to the public. The tables are numbered from 1 to N. For any pair of players, if there are some tables open when they arrive, they will be assigned to the ava...
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其他好文 时间：
2015-08-04 21:14:21
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225
You are given a tree (an undirected acyclic connected graph) withNnodes, and edges numbered 1, 2, 3...N-1. Each edge has an integer value assigned to ...
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其他好文 时间：
2015-08-03 20:55:19
阅读次数：
97
题目：
There are N children standing in a line. Each child is assigned a rating value.
You are giving candies to these children subjected to the following requirements:
Each child must have at...
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编程语言 时间：
2015-08-01 23:40:01
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221
关于scanf的返回值，MSDN里是这样写的：Both scanf and wscanf return the number of fields successfully convertedand assigned; the return value does not include fields ...
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其他好文 时间：
2015-07-31 17:54:04
阅读次数：
88
