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等价谓词重写
1、like规则 name like ‘abc%‘ 重写为 name >= ‘abc‘ and name <‘abd‘ 可以避免全表扫描,走索引 2、between-and规则 sno between 10 and 20 重写为 sno >= 10 and sno <=20 如果数据库对between-and走索引,改为...
分类:其他好文   时间:2014-08-10 13:12:42    阅读次数:307
spring框架下配置lucene
lucene特点及效果文章里就不说了,网上有的是。我就简单说下自己号码大全了解,正常 sql 查询时:name like '%继中%' 想必咱们一定理解这样不会走索引关键词挖掘的,然后就在多行数据等级查询相应时刻会很慢,对吧,由于数据库在一行行扫呢。所以咱们自然会想到怎样能让它走索引?解决方案之一:...
分类:编程语言   时间:2014-08-10 12:41:30    阅读次数:330
Nginx Installation、Configuration、Rreverse Proxy、Load Balancing Learning
Nginx("engine x")是一个高性能的HTTP和反向代理服务器,也是一个IMAP/POP3/SMTP代理服务器 Nginx可以在大多数Unix like OS上编译运行,并有Windows移植版。它的的源代码使用2-clause BSD-like license Nginx是一个很强大...
分类:其他好文   时间:2014-08-09 13:23:18    阅读次数:392
【ThinkingInC++】5、吧文件中的单词由后向前打印
文本文件 i like china i can play just do it i will cometrue my dream come on!!! 源程序 /** * 功能:2-5,2-6,2-7吧文件中的单词由后向前打印 * 时间:2014年7月30日21:27:12 * 作者:cutter_point */ #include #include #include #i...
分类:编程语言   时间:2014-08-09 11:48:17    阅读次数:231
CF#260 C.Boredom
Alex doesn't like boredom. That's why whenever he gets bored, he comes up with games. One long winter evening he came up with a game and decided to play it. Given a sequence a consisting of n integ...
分类:其他好文   时间:2014-08-09 11:42:48    阅读次数:311
HDU4915:Parenthese sequence(贪心)
Problem Description bobo found an ancient string. The string contains only three charaters -- "(", ")" and "?". bobo would like to replace each "?" with "(" or ")" so that the string is valid (d...
分类:其他好文   时间:2014-08-08 18:15:06    阅读次数:273
第一发JAVA 窃喜一下
Problem C If We Were a Child Again Input: standard input Output: standard output Time Limit: 7 seconds   “Oooooooooooooooh! If I could do the easy mathematics like my school days!! I...
分类:编程语言   时间:2014-08-08 18:10:16    阅读次数:281
HDU4925:Apple Tree
Problem Description I’ve bought an orchard and decide to plant some apple trees on it. The orchard seems like an N * M two-dimensional map. In each grid, I can either plant an apple tree to get one...
分类:移动开发   时间:2014-08-08 16:13:06    阅读次数:281
Why do we need the copy-and-swap idiom?
Any class that manages a resource (awrapper, like a smart pointer) needs to implementThe Big Three. While the goals and implementation of the copy-con...
分类:其他好文   时间:2014-08-08 15:51:06    阅读次数:262
首字母变大写(杭电2026)
/*首字母变大写 Input 输入数据包含多个测试实例,每个测试实例是一个长度不超过100的英文句子,占一行。   Output 请输出按照要求改写后的英文句子。   Sample Input i like acm i want to get an accepted   Sample Output I Like Acm I Want To Get An Accepted ...
分类:其他好文   时间:2014-08-08 09:42:02    阅读次数:201
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