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转载 Oracle Tip: Understand how NULLs affect IN and EXISTS

By Guest ContributorAugust 22, 2004, 5:36pm PDTOn the surface, it may appear that the SQL clauses IN and EXISTS are interchangeable. However, they're quite different in how they handle NUL

2012-06-25 14:41:38 400

转载 How Do I Enable Remote Access To MySQL Database Server?

By default remote access to MySQL database server is disabled for security reasons. However, some time you need to provide remote access to database server from home or a web server. If you want to re

2012-05-11 15:43:06 807

转载 Installing MySQL from a tarball

Installing MySQL from a tarballInstalling MySQL from a tarball should be straightforward but there are several steps, and therefore several opportunities for things to get funky. Nonetheless, doing

2012-05-09 10:04:38 447

原创 pgAdmin

1.如果postgresql安装的是9.0或以上版本，pgAdmin必须安装1.12版本或以上，否则报错如下： ERROR: column "datconfig" does not exist LINE 1: ...b.dattablespace AS spcoid, spcname, datallowconn, datconfig, .... I click ok and t

2012-05-08 13:52:43 3838

原创 JBoss start

start JBoss with a pure JRE installation 如果只安装了jre6，运行run.bat启动jboss的时候会看到如下错误： Error: no `server' JVM at `c:\jre1.5.0_07\bin\server\jvm.dll'. 修改 ru

2012-05-02 15:09:30 627

原创 webdriver selenium xpath

xpath 语法/ 表示从根节点开始查找//表示全文查找不填表示从当前节点查找@表示attribute, By.xpath("//iframe[@class='g-editor-iframe']" ref. xpath http://www.w3schools.com/xpath/获取iframe中的内容 S

2012-03-29 14:12:32 5374

操作系统概念（第六版）中文

操作系统是一种管理计算机硬件的程序，为应用程序提供了基本的运行条件，在计算机用户和计算机硬件之间扮演着中介的角色。操作系统的一个让人感到惊奇的方面就是它们所表现出来的丰富的多样性。大型计算机操作系统的首要设计目标是优化对硬件的使用。个人计算机（PC）操作系统则提供了对复杂的游戏、商业应用，以及对介于二者之间的所有应用软件的支持。手持计算机操作系统则向用户提供了一个运行计算机程序的便利的环境。这样，有些操作系统追求易用性，有些追求效率，还有些则是两者的折衷。

2011-03-15

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