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UTF-8 AND UTF-8 without BOM(遇到了这个问题 郁闷了会儿)
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...
分类:其他好文   时间:2014-08-21 16:41:14    阅读次数:177
提高数据库处理查询速度
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 ....
分类:数据库   时间:2014-08-21 16:36:34    阅读次数:218
在Mybatis中使用注解@多个参数查询
@Select("SELECT * FROM wc_homework WHERE organization_id=#{classId} ORDER BY createtime DESC LIMIT #{start},#{count}")     @Results({             @Result(column = "course_id", property = "course_id"...
分类:其他好文   时间:2014-08-21 00:12:43    阅读次数:227
android webview 通过html5播放在线视频 切换大屏
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...
分类:移动开发   时间:2014-08-20 22:41:33    阅读次数:403
sql2种分页
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 ....
分类:数据库   时间:2014-08-20 21:00:33    阅读次数:191
Subsets II
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...
分类:其他好文   时间:2014-08-20 19:37:12    阅读次数:175
【Leetcode】Remove Element
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...
分类:其他好文   时间:2014-08-20 13:59:22    阅读次数:176
POJ 3187 Backward Digit Sums(next_permutation)
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...
分类:其他好文   时间:2014-08-20 10:33:36    阅读次数:256
[Java Basics] multi-threading
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...
分类:编程语言   时间:2014-08-19 23:46:45    阅读次数:235
每日算法之四十二:Permutation Sequence (顺序排列第k个序列)
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...
分类:其他好文   时间:2014-08-19 22:34:25    阅读次数:288
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