两者的区别:Unicode规范中有一个BOM的概念。BOM——Byte Order Mark,就是字节序标记。在这里找到一段关于BOM的说明:在UCS 编码中有一个叫做"ZERO WIDTH NO-BREAK SPACE"的字符,它的编码是FEFF。而FFFE在UCS中是不存在的字符,所以不应该出现...
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其他好文 时间:
2014-08-21 16:41:14
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177
提高数据库处理查询速度1、对查询进行优化,应尽量避免全表扫描,首先应考虑在 where 及 order by 涉及的列上建立索引。2、应尽量避免在 where 子句中对字段进行 null 值判断,否则将导致引擎放弃使用索引而进行全表扫描,如: select id from t where num ....
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数据库 时间:
2014-08-21 16:36:34
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218
@Select("SELECT * FROM wc_homework WHERE organization_id=#{classId} ORDER BY createtime DESC LIMIT #{start},#{count}")
@Results({
@Result(column = "course_id", property = "course_id"...
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其他好文 时间:
2014-08-21 00:12:43
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227
1、添加网络访问权限
2、webview添加全屏支持
developer官方文档关于html5支持视频播放描述如下:In order to support inline HTML5 video in your application, you need to have hardware acceleration turned on, and set a WebChrom...
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移动开发 时间:
2014-08-20 22:41:33
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403
declare @time datetimedeclare @ms intset @time= getdate()select ID,name from (select row_number() over(order by ID) as rowNum,* from dbo.testb) as t ....
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数据库 时间:
2014-08-20 21:00:33
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191
Given a collection of integers that might contain duplicates, S, return all possible subsets.Note:Elements in a subset must be in non-descending order...
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其他好文 时间:
2014-08-20 19:37:12
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175
Given an array and a value, remove all instances of that value in place and return the new length.The order of elements can be changed. It doesn't mat...
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其他好文 时间:
2014-08-20 13:59:22
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176
Description
FJ and his cows enjoy playing a mental game. They write down the numbers from 1 to N (1 <= N <= 10) in a certain order and then sum adjacent numbers to produce a new list with one fewer...
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其他好文 时间:
2014-08-20 10:33:36
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256
1, InterruptInterruption in Java is not pre-emptive. Put another way both threads have to cooperate in order to process the interrupt properly. If the...
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编程语言 时间:
2014-08-19 23:46:45
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235
The set [1,2,3,…,n] contains a total
of n! unique permutations.
By listing and labeling all of the permutations in order,
We get the following sequence (ie, for n = 3):
"123""132""213""231""3...
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其他好文 时间:
2014-08-19 22:34:25
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288