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RSS订阅原创 数据仓库
数据仓库是面向主题的、集成的、稳定的、不同时间的数据集合，用于支持经营管理中决策制定的过程。数据库和数据仓库的区别数据库（DB）数据仓库（DW）面向应用面向主题数据是详细的数据是综合的或提炼的保持当前数据保存过去和现在的数据数据是可以更新的数据不更新对数据操作是重复的对数据的操作是启发式的操作需求是事先可知的...
2015-03-15 16:52:00
172
原创 https and subversion
启动SSLEngine 参考http://httpd.apache.org/docs/2.4/ssl/ssl_howto.html<VirtualHost *:443> SSLEngine on SSLCertificateFile /etc/apache2/ssl.key/server.cert SSLCertifi...
2014-12-11 22:13:34
187
原创 依赖管理
Apache Maven is a software project management and comprehension tool. Based on the concept of a project object model (POM), Maven can manage a project's build, reporting and documentation f...
2014-12-10 22:02:29
152
转载 8.9.3 The MySQL Query Cache
8.9.3 The MySQL Query Cache8.9.3.1 How the Query Cache Operates8.9.3.2 Query Cache SELECT Options8.9.3.3 Query Cache Configuration8.9.3.4 Query Cache Status and MaintenanceThe query ca
2014-08-03 09:37:08
474
转载 Buffering and Caching
8.9 Buffering and Caching8.9.1 The InnoDB Buffer Pool8.9.2 The MyISAM Key Cache8.9.3 The MySQL Query Cache8.9.4 Caching of Prepared Statements and Stored ProgramsMySQL uses several s
2014-08-02 22:48:49
598
转载 3.6.9 Using AUTO_INCREMENT
3.6.9 Using AUTO_INCREMENTThe AUTO_INCREMENT attribute can be used to generate a unique identity for new rows:CREATE TABLE animals ( id MEDIUMINT NOT NULL AUTO_INCREMENT, name CHAR
2014-08-02 21:53:29
349
原创 html5
HTML5 is the latest and most enhanced version of HTML. Technically, HTML is not aprogramming language, but rather a markup language. This tutorial gives very goodunderstanding on HTML5.HTML5 Overview...
2014-05-14 18:56:48
150
原创 Ab Test How to use ab (ApacheBench) for quickly load testing a web site
jmeterApacheBenchab
2014-04-21 16:22:20
135
原创 优化groupby 和distinct
Optimizing GROUP BY and DISTINCTMySQL optimizes these two kinds of queries similarly in many cases, and in fact con-verts between them as needed internally during the optimization process. Both t...
2014-04-21 13:43:58
546
原创 一个简单的sql优化
Simple optimizationsYou can sometimes use MyISAM’s COUNT(*) optimization to your advantage when youwant to count all but a very small number of rows that are well indexed. The followingexample ...
2014-04-21 13:09:49
123
原创 表示层模式:Transfer Object Assembler—传输对象组装器模式
ContextIn a Java 2 Platform, Enterprise Edition (J2EE) application, the server-side businesscomponents are implemented using session beans, entity beans, DAOs, and so forth.Application clients frequ...
2014-04-10 22:48:32
734
原创 表示层模式:Value List Handler—值列表处理器模式
ContextThe client requires a list of items from the service for presentation. The number ofitems in the list is unknown and can be quite large in many instances.ProblemMost Java 2 Platform, Enterpri...
2014-04-09 20:32:04
231
原创 业务层模式:Service Locator—服务定位器模式
ContextService lookup and creation involves complex interfaces and network operations.ProblemJ2EE clients interact with service components, such as Enterprise JavaBeans (EJB)and Java Message Service...
2014-04-09 20:31:48
266
原创 集成层模式:Data Access Object—数据访问对象模式
ContextAccess to data varies depending on the source of the data. Access to persistent storage,such as to a database, varies greatly depending on the type of storage (relational databases,object-ori...
2014-04-09 20:31:30
195
原创 集成层模式:Service Activator—服务激发器模式
ContextEnterprise beans and other business services need a way to be activatedasynchronously.ProblemWhen a client needs to access an enterprise bean, it first looks up the bean's homeobject. The cli...
2014-04-09 20:31:01
2488
原创 volatile变量的特性
1.保证次变量对所有线程的可见性，这里的“可见性”是指当一条线程修改了这个变量的值，新值对于其他线程来说是可以立即得知的。2.禁止指令重排优化，普通的变量仅仅会保证在该方法的执行过程中所有依赖赋值结果的地方都获取得到正确的结果，而不能保证变量赋值的顺序与程序代码中的执行顺序一致。...
2014-04-09 20:26:05
156
原创 业务层模式:Composite Entity—复合实体模式
ContextEntity beans are not intended to represent every persistent object in the object model.Entity beans are better suited for coarse-grained persistent business objects.ProblemIn a Java 2 Platfor...
2014-04-08 21:38:36
354
原创 业务层模式:Session Facade—会话门面模式
ContextEnterprise beans encapsulate business logic and business data and expose theirinterfaces, and thus the complexity of the distributed services, to the client tier.ProblemIn a multitiered Java ...
2014-04-08 21:38:14
428
原创 业务层模式:Transfer Object—传输对象模式
ContextApplication clients need to exchange data with enterprise beans.ProblemJava 2 Platform, Enterprise Edition (J2EE) applications implement server-sidebusiness components as session beans and en...
2014-04-08 21:37:56
356
原创 业务层模式:Business Delegate—业务委托模式
ContextA multi-tiered, distributed system requires remote method invocations to send andreceive data across tiers. Clients are exposed to the complexity of dealing with distributedcomponents.Problem...
2014-04-08 21:37:43
395
原创 表示层模式:Dispatcher View—分发者视图模式
ContextSystem controls flow of execution and access to presentation processing, which isresponsible for generating dynamic content.NoteThe Dispatcher View pattern, like the Service to Worker pattern...
2014-04-08 21:37:28
271
原创 表示层模式:Service to Worker—工作者服务模式
ContextThe system controls flow of execution and access to business data, from which itcreates presentation content.NoteThe Service to Worker pattern, like the Dispatcher View pattern, describes a com...
2014-04-07 10:48:35
314
原创 表示层模式:Front Controller—前端控制器模式
ContextThe presentation-tier request handling mechanism must control and coordinateprocessing of each user across multiple requests. Such control mechanisms may bemanaged in either a centralized or de...
2014-04-07 10:45:09
242
原创 表示层模式:Composite View—复合视图模式
ContextSophisticated Web pages present content from numerous data sources, using multiplesubviews that comprise a single display page. Additionally, a variety of individuals withdifferent skill sets...
2014-04-07 10:41:21
468
原创 表示层模式:View Helper—视图助手模式
ContextThe system creates presentation content, which requires processing of dynamicbusiness data.ProblemPresentation tier changes occur often and are difficult to develop and maintain whenbusiness ...
2014-04-07 10:37:11
345
原创 表示层模式:Intercepting Filter—拦截过滤器模式
Context The presentation-tier request handling mechanism receives many different types ofrequests, which require varied types of processing. Some requests are simply forwarded tothe appropria...
2014-04-07 10:29:25
126
原创 ThreadLocal
1.ThreadLocal处理数据在线程属性threadLocals引用；2.ThreadLocalMap key 是ThreadLocal对象，value的类型是ThreadLocal范型参数类型；3.ThreadLocalMap的线性表会resize， int newLen = oldLen * 2，其中 threshold = len * 2 / 3 ，触发rehash的必要条件是
2014-03-22 11:11:12
435
原创 mysql date info
取昨天的这个时间点 select date_add(now(),interval-1 day) 输出：2013-12-29 18:36:44取明天的这个时间点 select date_add(now(),interval1 day) 输出：2013-12-31 18:40:23
2013-12-31 10:40:52
557
转载 How to calculate the MD5 hash of a large file in C?
#include #include int main(){ unsigned char c[MD5_DIGEST_LENGTH]; char *filename="file.c"; int i; FILE *inFile = fopen (filename, "rb"); MD5_CTX mdContext; int bytes; u
2013-11-01 16:04:09
780
转载 Install Google’s Android Eclipse plugin
How-To: Install Google’s Android Eclipse plugin (and/or adb) on 64-bit Debian/UbuntuHow-To: Install Google’s Android Eclipse plugin (and/or adb) on 64-bit Debian/UbuntuBy Tim Mattison
2013-10-31 08:56:26
481
转载 mvn introduction
4.2 变量 1) 问：如何使用变量替换？项目中的某个配置文件比如jdbc.properties使用了一些pom中的变量，如何在发布中使用包含真实内容的最终结果文件？ 答：使用资源过滤功能，比如： ... com.mysql.jdbc.Driver jdbc:mysql://localhost:3306/devel
2013-10-27 17:06:46
334
转载 veloeclipse eclipse上的几个Velocity插件
http://code.google.com/p/veloeclipse/or http://blog.youkuaiyun.com/superbeck/article/details/5721382
2013-10-26 15:34:58
414
转载 java.util.concurrent介绍
http://www.cnblogs.com/sarafill/archive/2011/05/18/2049461.htmlhttp://www.cnblogs.com/sarafill/ http://heipark.iteye.com/blog/1156011 http://www.itzhai.com/the-java-util-concurrent-the-overa
2013-10-24 13:19:28
406
转载 Java Language and Virtual Machine Specifications
http://docs.oracle.com/javase/specs/index.html
2013-10-24 09:15:11
616
转载 深入分析Java ClassLoader原理
http://blog.youkuaiyun.com/xyang81/article/details/7292380
2013-10-24 09:08:05
622
转载 APACHE中增加模块遇到的问题 http_proxy proxy_util
在用apxs安装apache mod_proxy时候出现undefined symbol: ap_proxy_lb_workers的错误，原先用的是：apxs -i -a -c mod_proxy.c错误信息：httpd: Syntax error on line 19 of /opt/lamp/apache2/conf/httpd.conf: Cannot load /opt/lamp/
2013-10-22 15:17:51
4187
转载 Building Apache2 From Source on Linux (Redhat 8)
Building Apache2 From Source on Linux (Redhat 8)This page shows the steps used to compile and build apache2 on linux. The example uses Apache 2.0.46 on Redhat 8 using a bash shell, you will need gcc
2013-10-21 11:26:52
424
原创 apache2 add rewrite 增加 rewrite mod_rewrite
如果在安装目录下的modules目录里有mod_rewrite.so,则在/conf/httpd.conf文件中加入LoadModule rewrite_module modules/mod_rewrite.so如果在安装目录下的modules目录里没有mod_rewrite.so，在apache源码包解压目录modules/mappers中find文件mod_rewrite.c，执行
2013-10-21 11:22:35
453
原创 线程相关的
ConnectionPool.javapackage pool;import java.sql.Connection;public interface ConnectionPool { Connection borrow(); boolean repay(Connection conn);}Connecti
2013-09-07 19:57:15
377
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