大家都知道hibernate中的one-to-one映射主要有两种策略，（1）一对一主键关联（单向和双向）。（2）一对一外键映射（单项和双向）。本文主要讲解一下，一对一外键映射中的双向问题，在此前先通过一个实例了解。 person和idCard,是一种一对一的关系，其中 t_person表idn.....
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其他好文 时间：
2014-07-30 20:23:14
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261
Create indexes on one or more columns in a table to help SQL server find the data quickly in a query.An index helps speed up SELECT queries and WHERE ...
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数据库 时间：
2014-07-30 20:15:54
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281
Master-Mind Hints
MasterMind is a game for two players. One of them, Designer, selects a secret code. The other,Breaker, tries to break it. A code is no more than a row of colored dots. ...
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其他好文 时间：
2014-07-30 14:44:53
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242
Description
Recently, researchers on Mars have discovered N powerful atoms. All of them are different. These atoms have some properties. When two of these atoms collide, one of them disappears and ...
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其他好文 时间：
2014-07-30 12:24:13
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226
Single Number I
问题描述：
Given an array of integers, every element appears twice except for one. Find that single one.
解题思路：
既然除了某个元素出现一次外，其他所有元素都出现两次，那么可以异或数组的所有元素，得到的结果就是我们所要找的那个元素的值。
class Solu...
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其他好文 时间：
2014-07-30 12:19:53
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184
场景,两个不同服务器上的数据库,进行数据库同步 但是执行之后,提示报错 错误代码： 1293 Incorrect table definition; there can be only one TIMESTAMP column with CURRENT_TIMESTAMP in DEFAULT or...
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其他好文 时间：
2014-07-30 12:05:23
阅读次数：
280
Nick's company employed n people. Now Nick needs to build a tree hierarchy of «supervisor-surbodinate» relations in the company (this is to say that each
employee, except one, has exactly one superv...
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其他好文 时间：
2014-07-30 10:06:53
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286
题目： Find the contiguous subarray within an array (containing at least one number) which has the largest sum.For example, given the array [?2,1,?3,4,?1...
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编程语言 时间：
2014-07-30 05:34:43
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319
题目：Say you have an array for which the ith element is the price of a given stock on day i.If you were only permitted to complete at most one transact....
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编程语言 时间：
2014-07-30 05:34:13
阅读次数：
248
Methods and apparatus to provide for power consumption reduction in memories (such as cache memories) are described. In one embodiment, a virtual tag ...
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其他好文 时间：
2014-07-30 03:13:53
阅读次数：
372
