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7/3/2009

火灾

最近天气热，没想到经然还发生火灾。

6:17 PM | Add a comment | Permalink | Blog it

6/30/2009

The crontab command, found in Unix and Linux operating systems, is used to schedule commands to be executed periodically. To see what crontabs are currently running on your system, you can open a terminal and run:

sudo crontab -l

To edit the list of cronjobs you can run:

sudo crontab -e

This will open the default editor (could be vi or pico, if you want you can change the default editor) to let us manipulate the crontab. If you save and exit the editor, all your cronjobs are saved into crontab. Cronjobs are written in the following format:

* * * * * /bin/execute/this/script.sh

Scheduling explained:

As you can see there are 5 stars. The stars represent different date parts in the following order:

1. minute (from 0 to 59)

2. hour (from 0 to 23)

3. day of month (from 1 to 31)

4. month (from 1 to 12)

5. day of week (from 0 to 6) (0=Sunday)

Example:

1. Logon Linux use comment account (eg: danny)

2. Create an autorun.sh file

(1) [danny@www ~]$ cd /home/danny

(2) [danny@www danny]$ vi autorun.sh

(3) [danny@www danny]$ chmod 755 autorun.sh

3. Edit the corrent Crontab

[danny@www danny]$ crontab –e

0 23 * * * /home/danny/autorun.sh

4:49 PM | Add a comment | Permalink | Blog it | Linux

Efficiency of the Filzip3.04

Yesterday, I wanted extract a file which include 50,000 sub-files (but each sub-file is just 4kb), it spend me 7~8 hours.

Oh, my god, I wasted the whole day just unzip a file. What I did is download and install 7-Zip instead immediately.

Maybe I should send a email to Mr. Philipp Engel(philipp.engel(at)filzip.com) and tell him about this, before he release the new version, pls do the performance test first.

7:39 AM | Add a comment | Permalink | Blog it | Computers and Internet

6/26/2009

Ubuntu下安装Eclipse

1、首先下载eclipse-SDK：http://www.eclipse.org/downloads/

2、安装eclipse
（1）把eclipse-SDK解压到某个目录中，如解压到/opt下，得到/opt/eclipse目录

（2）在/usr/bin目录下创建一个启动脚本eclipse，执行下面的命令来创建：sudo vi /usr/bin/eclipse

然后在该文件中添加以下内容：

#!/bin/sh
export MOZILLA_FIVE_HOME=”/usr/lib/mozilla/”
export ECLIPSE_HOME=”/opt/eclipse”

$ECLIPSE_HOME/eclipse $*
（3）让修改该脚本的权限，让它变成可执行，执行下面的命令：

sudo chmod +x /usr/bin/eclipse

3、在桌面或者gnome菜单中添加eclipse启动图标
（1）在桌面或者启动面板上添加图标：
在桌面（右键单击桌面->创建启动器）上创建一个新的启动器，然后添加下列数据：
名称：Eclipse
命令：eclipse
图标： /opt/eclipse/icon.xpm

（2）在Applications（应用程序）菜单上添加一个图标
用文本编辑器在/usr/share/applications目录里新建一个名为eclipse.desktop的启动器，如下面的命令:sudo vi /usr/share/applications/eclipse.desktop

然后在文件中添加下列内容：

[Desktop Entry]
Encoding=UTF-8
Name=Eclipse Platform
Comment=Eclipse IDE
Exec=eclipse
Icon=/opt/eclipse/icon.xpm
Terminal=false
StartupNotify=true
Type=Application
Categories=Application;Development;

保存文件。完成整个安装过程，可以双击桌面eclipse的图标来运行eclipse。

9:38 AM | Add a comment | Permalink | Blog it | Linux

6/4/2009

Space国内竟然不能访问

Space空间本周竟然不能访问，难道是因为Bing上线？

8:55 PM | Add a comment | Permalink | Blog it | Computers and Internet

6/3/2009

50 Specific Ways to Improve Your Testing

1. Requirements Phase
Item 1: Involve Testers from the Beginning
Item 2: Verify the Requirements
Item 3: Design Test Procedures As Soon As Requirements Are Available
Item 4: Ensure That Requirement Changes Are Communicated
Item 5: Beware of Developing and Testing Based on an Existing System

2. Test Planning
Item 6: Understand the Task At Hand and the Related Testing Goal
Item 7: Consider the Risks
Item 8: Base Testing Efforts on a Prioritized Feature Schedule
Item 9: Keep Software Issues in Mind
Item 10: Acquire Effective Test Data
Item 11: Plan the Test Environment
Item 12: Estimate Test Preparation and Execution Time

3. The Testing Team
Item 13: Define Roles and Responsibilities
Item 14: Require a Mixture of Testing Skills, Subject-Matter Expertise, and Experience
Item 15: Evaluate the Tester's Effectiveness

4. The System Architecture
Item 16: Understand the Architecture and Underlying Components
Item 17: Verify That the System Supports Testability
Item 18: Use Logging to Increase System Testability
Item 19: Verify That the System Supports Debug and Release Execution Modes

5. Test Design and Documentation
Item 20: Divide and Conquer
Item 21: Mandate the Use of a Test-Procedure Template and Other Test-Design Standards
Item 22: Derive Effective Test Cases from Requirements
Item 23: Treat Test Procedures As "Living" Documents
Item 24: Utilize System Design and Prototypes
Item 25: Use Proven Testing Techniques when Designing Test-Case Scenarios
Item 26: Avoid Including Constraints and Detailed Data Elements within Test Procedures
Item 27: Apply Exploratory Testing

6. Unit Testing
Item 28: Structure the Development Approach to Support Effective Unit Testing
Item 29: Develop Unit Tests in Parallel or Before the Implementation
Item 30: Make Unit-Test Execution Part of the Build Process

7. Automated Testing Tools
Item 31: Know the Different Types of Testing-Support Tools
Item 32: Consider Building a Tool Instead of Buying One
Item 33: Know the Impact of Automated Tools on the Testing Effort
Item 34: Focus on the Needs of Your Organization
Item 35: Test the Tools on an Application Prototype

8. Automated Testing: Selected Best Practices
Item 36: Do Not Rely Solely on Capture/Playback
Item 37: Develop a Test Harness When Necessary
Item 38: Use Proven Test-Script Development Techniques
Item 39: Automate Regression Tests When Feasible
Item 40: Implement Automated Builds and Smoke Tests

9. Nonfunctional Testing
Item 41: Do Not Make Nonfunctional Testing an Afterthought
Item 42: Conduct Performance Testing with Production-Sized Databases
Item 43: Tailor Usability Tests to the Intended Audience
Item 44: Consider All Aspects of Security, for Specific Requirements and System-Wide
Item 45: Investigate the System's Implementation To Plan for Concurrency Tests
Item 46: Set Up an Efficient Environment for Compatibility Testing

10. Managing Test Execution
Item 47: Clearly Define the Beginning and End of the Test-Execution Cycle
Item 48: Isolate the Test Environment from the Development Environment
Item 49: Implement a Defect-Tracking Life Cycle
Item 50: Track the Execution of the Testing Program

Effective Software Testing: 50 Specific Ways to Improve Your Testing

By Elfriede Dustin

Publisher: Addison Wesley

Pub Date: December 18, 2002

ISBN: 0-201-79429-2

9:16 PM | Add a comment | Permalink | Blog it | Software Testing

6/1/2009

A good blog to learn Oracle

Focusing Specifically On Oracle Indexes, Database Administration and Some Great Music

Richard Foote's Oracle Blog (Thanks for Jussi Volanen sharing)

1:02 PM | Add a comment | Permalink | Blog it | Oracle

5/31/2009

eclipse的提示功能不见了怎么办

windows->preference->java->Editor->content Assist->Advance

3:41 PM | Add a comment | Permalink | Blog it | Java

Oracle内存全面分析

http://www.hellodba.com/Doc/oracle_memory(1).htm

10:44 AM | Add a comment | Permalink | Blog it | Oracle

5/27/2009

Python中and和or的特殊性质

在Python 中，and 和 or 执行布尔逻辑演算，如你所期待的一样。但是它们并不返回布尔值，而是返回它们实际进行比较的值之一。

1. `and` 介绍

>>> 'a' and 'b'         (1)
'b'
>>> '' and 'b'          (2)
''
>>> 'a' and 'b' and 'c' (3)
'c'

(1)	使用 `and` 时，在布尔环境中从左到右演算表达式的值。`0`、`''`、`[]`、`()`、`{}`、`None` 在布尔环境中为假；其它任何东西都为真。还好，几乎是所有东西。默认情况下，布尔环境中的类实例为真，但是你可以在类中定义特定的方法使得类实例的演算值为假。你如果布尔环境中的所有值都为真，那么 `and` 返回最后一个值。在这个例子中，`and` 演算 `'a'` 的值为真，然后是 `'b'` 的演算值为真，最终返回 `'b'`。
(2)	如果布尔环境中的某个值为假，则 `and` 返回第一个假值。在这个例子中，`''` 是第一个假值。
(3)	所有值都为真，所以 `and` 返回最后一个真值，`'c'`。

2. `or` 介绍

>>> 'a' or 'b'          [1]
'a'
>>> '' or 'b'           [2]
'b'
>>> '' or [] or {}      [3]
{}
>>> def sidefx():
...     print "in sidefx()"
...     return 1
>>> 'a' or sidefx()     [4]
'a'

[1]	使用 `or` 时，在布尔环境中从左到右演算值，就像 `and` 一样。如果有一个值为真，`or` 立刻返回该值。本例中，`'a'` 是第一个真值。
[2]	`or` 演算 `''` 的值为假，然后演算 `'b'` 的值为真，于是返回 `'b'` 。
[3]	如果所有的值都为假，`or` 返回最后一个假值。`or` 演算 `''` 的值为假，然后演算 `[]` 的值为假，依次演算 `{}` 的值为假，最终返回 `{}` 。
[4]	注意 `or` 在布尔环境中会一直进行表达式演算直到找到第一个真值，然后就会忽略剩余的比较值。如果某些值具有副作用，这种特性就非常重要了。在这里，函数 `sidefx` 永远都不会被调用，因为 `or` 演算 `'a'` 的值为真，所以紧接着就立刻返回 `'a'` 了。

如果你是一名 C 语言黑客，肯定很熟悉 bool ? a : b 表达式，如果 bool 为真，表达式演算值为 a，否则为 b。基于 Python 中 and 和 or 的工作方式，你可以完成相同的事情。

使用 and-or 技巧

3. `and-or` 技巧介绍

>>> a = "first"
>>> b = "second"
>>> 1 and a or b {1}
'first'
>>> 0 and a or b {2}
'second'

{1}	这个语法看起来类似于 C 语言中的 `bool ? a : b` 表达式。整个表达式从左到右进行演算，所以先进行 `and` 表达式的演算。`1 and 'first'` 演算值为 `'first'`，然后 `'first' or 'second'` 的演算值为 `'first'`。
{2}	`0 and 'first'` 演算值为 `False`，然后 `0 or 'second'` 演算值为 `'second'`。

然而，由于这种 Python 表达式单单只是进行布尔逻辑运算，并不是语言的特定构成，这是 and-or 技巧和 C 语言中的 bool ? a : b 语法非常重要的不同。如果 a 为假，表达式就不会按你期望的那样工作了。(你能知道我被这个问题折腾过吗？不止一次？)

4. `and-or` 技巧无效的场合

>>> a = ""
>>> b = "second"
>>> 1 and a or b         (1)
'second'

(1)	由于 `a` 是一个空字符串，在 Python 的布尔环境中空字符串被认为是假的，`1 and ''` 的演算值为 `''`，最后 `'' or 'second'` 的演算值为 `'second'`。噢！这个值并不是你想要的。

and-or 技巧，也就是 bool and a or b 表达式，当 a 在布尔环境中的值为假时，不会像 C 语言表达式 bool ? a : b 那样工作。

在 and-or 技巧后面真正的技巧是，确保 a 的值决不会为假。最常用的方式是使 a 成为 [a] 、 b 成为 [b]，然后使用返回值列表的第一个元素，应该是 a 或 b中的某一个。

5. 安全使用 `and-or` 技巧

>>> a = ""
>>> b = "second"
>>> (1 and [a] or [b])[0] <1>
''

<1>	由于 `[a]` 是一个非空列表，所以它决不会为假。即使 `a` 是 `0` 或者 `''` 或者其它假值，列表 `[a]` 也为真，因为它有一个元素。

到现在为止，这个技巧可能看上去问题超过了它的价值。毕竟，使用 if 语句可以完成相同的事情，那为什么要经历这些麻烦事呢？哦，在很多情况下，你要在两个常量值中进行选择，由于你知道 a 的值总是为真，所以你可以使用这种较为简单的语法而且不用担心。对于使用更为复杂的安全形式，依然有很好的理由要求这样做。例如，在 Python 语言的某些情况下 if 语句是不允许使用的，比如在 lambda 函数中。

进一步阅读

Python Cookbook 讨论了其它的 and-or 技巧。

《Dive Into Python》 http://diveintopython.org (英文原版) 和 http://www.woodpecker.org.cn/diveintopython(中文版)

11:28 AM | Add a comment | Permalink | Blog it | Python & Jython

5/26/2009

JVM 规范研究

下载地址：http://www.blogjava.net/Files/Jack2007/JVMTTT.doc

9:11 PM | Add a comment | Permalink | Blog it | Java

5/17/2009

云计算 Cloud Computing

http://www.ibm.com/developerworks/spaces/cn/cloud/?ca=drs-tp4608

7:12 PM | Add a comment | Permalink | Blog it | Computers and Internet

5/13/2009

Windows下如何得到一个站点的IP

C:\>ping mail.163.com

Pinging mcache.idns.yeah.net [123.125.50.22] with 32 bytes of datas:

C:\>nslookup mail.163.com

Server: bogon.cn.bl.medicel.com
Address: 192.168.9.10

Non-authoritative answer:
Name: mcache.idns.yeah.net
Address: 123.125.50.22
Aliases: mail.163.com, mcache.mail.163.com

5:33 PM | Add a comment | Permalink | Blog it | Computers and Internet

Cobertura

用Cobertura测量测试覆盖率

Measure test coverage with Cobertura

3:21 PM | Add a comment | Permalink | Blog it | Software Testing

5/12/2009

The Scrum Development Process

what is Scrum and Scrum(development)

Other useful website about Scrum:

http://www.scrumalliance.org

http://www.controlchaos.com

scrumdevelopment@yahoogroups.com

There has a book you can download for free:Scrum and XP from the Trenches

You can get more information about the auther: Henrik Kniberg, and his blog is: http://blog.crisp.se/henrikkniberg

12:56 PM | Add a comment | Permalink | Blog it | Project Management

5/10/2009

Windows快速关机工具DirectShutDown

DirectShutDown是一款免费和高可靠性的可以提供快速关机、重启、锁定、进入睡眠状态的工具；

DirectShutDown支持Windows98, Windows ME, Windows 2000, Windows XP，但是不支持Linux, Mac, Palm, or PocketPC；

点击链接下载：DirectShutDown

5/9/2009

Good things

MSDN Magazine and TechNet Magazine

7:08 PM | Add a comment | Permalink | Blog it | Books

5/5/2009

微软开始提供Windows7 RC版下载

下载链接：Windows 7 Release Candidate

1.下载日期持续到09年7月；

2.本次下载的用户可以免费使用到10年6月1日，从10年3月1日起安装此版本的电脑将会每隔两个小时自动关机一次；

3.对PC硬件的要求：

1 GHz 或更高的 32-bit (x86) or 64-bit (x64) 处理器
1 GB RAM (32-bit) / 2 GB RAM (64-bit)
16 GB (32-bit) / 20 GB (64-bit) 可用硬盘空间
DirectX 9 图像处理器 with WDDM 1.0 or higher driver

5/1/2009

CMMI:Process Areas as Presented in the Continuous Representation

Process Management

OPF Organizational Process Focus

OPD Organizational Process Definition

OT Organizational Training

OPP Organizational Process Performance

OID Organizational Innovation and Deplotment

Project Management

PP Project Planning

PMC Project Monitoring and Control

SAM Supplier Agreement Management

IPM Integrated Project Management

RSKM Risk Management

IT Integrated Teaming

ISM Integrated Supplier Management

QPM Quantitative Project Management

Engineering

REQM Requirements Management

RD Requirements Development

TS Technical Solution

PI Product Integration

VER Verification

VAL Validation

Support

CM Configuration Management

PPQA Process and Product Quality Assurance

MA Measurement and Analysis

DAR Decision Analysis and Resolution

OEI Organizational Environment for Integration

CAR Causal Analysis and Resolution

12:35 PM | Add a comment | Permalink | Blog it | Project Management

4/15/2009

CMMI:Process Areas as Presented in the Staged Representation

Maturity Level 2

REQM Requirements Management

PP Project Planning

PMC Project Monitoring and Control

SAM Supplier Agreement Management

MA Measurement and Analysis

PPQA Process and Product Quality Assurance

CM Configuration Management

Maturity Level 3

RD Requirements Development

TS Technical Solution

PI Product Integration

VER Verification

VAL Validation

OPF Organizational Process Focus

OPD Organizational Process Definition

OT Organizational Training

IPM Integrated Project Management

RSKM Risk Management

IT Integrated Teaming

ISM Integrated Supplier Management

DAR Decision Analysis and Resolution

OEI Organizational Environment for Integration

Maturity Level 4

OPP Organizational Process Performance

OEI Organizational Environment for Integration

Maturity Level 5

OID Organizational Innovation and Deplotment

CAR Causal Analysis and Resolution

4/14/2009

这下丢人丢大了

4/9/2009

如何在Eclipse下开发Jython

在Eclipse下安装JyDT插件，详细步骤请看：

1.如何安装JyDT

2.如何从本地安装JyDT

更多帮助信息可以参考：http://www.redrobinsoftware.net/jydt/

3:15 PM | Add a comment | Permalink | Blog it | Python & Jython

3/14/2009

Windows下安装Jython2.2.1

Jython的安装比较简单，Jython的安装程序本身就是一个Java应用程序，因此，在安装之前，你必须具备Java运行的环境。下面以Jython的Jython2.2.1为例，说明Jython的安装步骤:

一.下载和安装JDK(注意：jdk版本不能太低，否则安装Jython时可能会出错)

二.在Jython组织的官方网站http://www.jython.org下载Jython的最新版jython_installer-2.2.1.jar

三.开始->运行->cmd->转到jython_installer-2.2.1.jar所在目录，输入命令：java -jar jython_installer-2.2.1.jar

四.出现安装界面(目前好像只支持英语和德语)

五.验证安装(进入安装到的目录,输入jython)

六.Hello World

>>>print "Hello World!"

七.退出

1.按两次 ctrl + c

2.>>>import sys; sys.exit()

八.可以设置环境变量PATH=D:\jython2.2.1

这样在命令行下只用输入jython即可

10:30 PM | Add a comment | Permalink | Blog it | Python & Jython

1/18/2009

ADO.NET测试（二） --测试有返回值的存储过程

假如，我们要测试一个叫做usp_MoreThan()的存储过程，这个存储过程返回SQL表中价格高于输入数值的int值：

create procedure usp_MoreThan

@inputPrice money

declare @ans int

select @ans = count(*) from tblPrices where price > inputPrice

return @ans

int expected = 2;
int actual;
string input = "100.00";
string connString = "Server=(local);Database=dbPrices;UID=userId;PWD=password";
SqlConnection sc = new SqlConnection(connString);
SqlCommend cmd = new SqlCommend("usp_MoreThan", sc);
cmd.CommandType = CommandType.StoredProcedure;
SqlParameter p1 = cmd.Parameters.Add("ret_val", SqlDbType.Int);
p1.Direction = ParameterDirection.ReturnValue;
SqlParameter p2 = cmd.Parameters.Add("@inputPrice", SqlDbType.Money);
p2.Direction = ParameterDirection.Input;
p2.Value = input;
sc.open();
if(actual == expected)
Console.WriteLine("Pass");
else
Console.WriteLine("Fail");

9:38 AM | Add a comment | Permalink | Blog it | Software Testing

雪梅娘

无意中在中山公园龙之梦竟然发现了这个，XM同学～嘿嘿

9:33 AM | Add a comment | Permalink | Blog it | C'est La Vie

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向“劳动者”致敬

Oct. 23

1. and 介绍

2. or 介绍

使用 and-or 技巧

3. and-or 技巧介绍

4. and-or 技巧无效的场合

5. 安全使用 and-or 技巧

进一步阅读

Counter

1. `and` 介绍

2. `or` 介绍

使用 `and-or` 技巧

3. `and-or` 技巧介绍

4. `and-or` 技巧无效的场合

5. 安全使用 `and-or` 技巧