The smallwig theory of optimization -

关系数据库性能问题

关系数据库性能问题一、任务描述工作中的一个数据批量任务，涉及到4张基本表和4张业务数据表。基本表 (Basic Table) 数据量不大，每个表最多几百条记录；业务表 (Transaction Table) 数据量较大，每个表有几十万条记录。以前的版本使用OO（O/R ?）方式， (1) SQL查询数据库选出一个业务表的数据，每条记录映射为一个Object。 (2) 循环每个Obj ...

by buaawhl 2005-01-21 浏览 (11568) 回复 (12) 关键字:

Are we doing O/R mapping wrong?

Playing with JDO 2 fetch groups, ZODB, thinking about TranQL (for two months now), playing with Prevayler, and looking at TORPEDO (need to run OJB against it when I have a chance) something clicked fo ...

by yyanghhong 2004-10-05 浏览 (2085) 回复 (3) 关键字:

Ruby DSL

http://forum.javaeye.com/viewtopic.php?p=128602#128602 potian 写道 macro没有利用任何反射能力，和类型也没有关系 Lisp macro(我只知道Common Lisp)的macro主要是开放编译器内部的结构，把词法分析、语法分析和语义分析和执行中间割裂（不过S-Expression非常简单，基本上没有语法)，Lisp的S-expr ...

by buaawhl 2006-07-12 浏览 (9963) 回复 (10) 关键字:

the paint points of xaml

Pain Point 1: XAML always create the controls by its default constructor This means, you need to have a default constructor for you control, and the constructor will always be used by XAML. So, you c ...

by taowen 2008-01-16 浏览 (720) 回复 (0) 关键字:

数据库大批量数据插入的性能优化问题

情况是这样的：用户要在页面上提交或指定服务器上的一个数据文件，然后后台程序对这个数据文件进行分析。分析过程类似字符串匹配，会生成大量的数据，要插入到数据库里面，这里就产生了性能问题。目前在实现上采用spring+hibernate+mysql，PO有两个简单的多对一单向关联。我自己测试了一个174K的数据文件，总共产生一万两千条记录。本来要近10分钟，现在已经减少到20秒以内。已经做了如下的一些 ...

by de3light 2004-12-02 浏览 (2408) 回复 (9) 关键字:

[Java细节]"hi there".equals("cheers !") == true

不知道这个标题是否让读者产生一种想打我的冲动。至少今天我的主管被我用这个小把戏诧异了一把，当他看到"hi there".equals("cheers !") 的结果居然是true时，脸上的表情实在是可爱。OK，言归正传。System.out.println("hi there".equals("cheers !")); 这个看来再显然不过的句子，输出的结果居然是true。聪明的读者，你知道是为什么 ...

by softstone 2003-05-30 浏览 (28) 回复 (0) 关键字:

[转]Why thou shall not use Skype!

Why thou shall not use Skype! (ahora en castellano también) This is a blog focused on FOSS so I shouldn't be talking too much about proprietary stuff. The only problem is not too much that Skype is ...

by liuwangxia 2006-09-30 浏览 (492) 回复 (0) 关键字:

Flex With Spring [转]

来源： http://coenraets.org/flex-spring What is Spring?Spring is one of the most popular Java frameworks. The foundation ofthe Spring framework is a lightweight comp ...

by mikel 2007-11-23 浏览 (1299) 回复 (1)

Action english

Action english 是CCTV-SIX 的一个英语节目，感觉很不错

by youlong05 2007-04-23 浏览 (1455) 回复 (5)

The Problem with Programming

转自： http://www.techreview.com/InfoTech/17831/page1/ Bjarne Stroustrup, the inventor of the C++ programming language, defends his legacy and examines what's wrong with most software code. 引用 In the 1 ...

by qiezi 2006-12-06 浏览 (1110) 回复 (2)

(共享)Enjoying Web Development with Tapestry三个版本(免费前四章)

网站：http://www.agileskills2.org/EWDT/ 介绍： How to create AJAX web-based application easily? If you'd like to create AJAX web-based applications easily, then this book is for you. More importantly, it s ...

by tapestry 2007-02-02 浏览 (993) 回复 (0)

新编程语言：C--

官方网站：http://www.cminusminus.org 引用:介绍：C-- 语言是一个编译器的目标语言。该想法是一种一个高层次的语言编译器，转换程序进入到C --语言，使得C--编译器产生本土代码。 1 Introduction C-- is a compiler-target language. The idea is that a compiler for a high-le ...

by jejwe 2008-02-10 浏览 (1337) 回复 (0) 关键字: c--

[转] JRuby 1.0.0RC3 Released!

转自: http://docs.codehaus.org/display/JRUBY/2007/06/02/JRuby+1.0.0RC3+Released%21 The JRuby community is pleased to announce the release of JRuby 1.0.0RC3. Homepage: http://www.jruby.org/ Download: h ...

by liuwangxia 2007-06-04 浏览 (450) 回复 (1) 关键字: jruby

Uncle Bob新书Clean Code

Robert C. Martin最近的新书《Clean Code》即将由Prentice Hall出版社出版。目录如下： Clean Code 1 There Will Be Code 1 Bad Code 2 ...

by samuelray 2008-04-08 浏览 (525) 回复 (2) 关键字: clean code

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