<?xml version="1.0" encoding="utf-8" ?><rss version="2.0"><channel><title><![CDATA[verejava的博客]]></title><description><![CDATA[]]></description><link>https://blog.youkuaiyun.com/verejava</link><language>zh-cn</language><generator>https://blog.youkuaiyun.com/</generator><copyright><![CDATA[Copyright &copy; verejava]]></copyright><item><title><![CDATA[DDL 索引]]></title><link>https://blog.youkuaiyun.com/verejava/article/details/80756050</link><guid>https://blog.youkuaiyun.com/verejava/article/details/80756050</guid><author>verejava</author><pubDate>Thu, 21 Jun 2018 09:58:10 +0800</pubDate><description><![CDATA[http://www.verejava.com/?id=17174136953561 . 索引
  索引(index) 是提升查询效率的数据库对象.
  
  
  2. 索引分类
    1. 唯一性索引和非唯一性索引
      按照索引字段是否允许重复来划分的,  一般唯一性索引查询效率最高, 所以MySQL 给主键和唯一键自动分配唯一性索引.
  
    2. 单索引和联合索引
    ...]]></description><category></category></item><item><title><![CDATA[DDL 视图]]></title><link>https://blog.youkuaiyun.com/verejava/article/details/80756034</link><guid>https://blog.youkuaiyun.com/verejava/article/details/80756034</guid><author>verejava</author><pubDate>Thu, 21 Jun 2018 09:57:29 +0800</pubDate><description><![CDATA[http://www.verejava.com/?id=1717413465805知识点
  1. 创建视图   ----重点
  2. 删除视图
  3. 创建复杂视图   ----重点
  
  
1 . 视图
  视图是从实际的数据表中提取数据后形成的　虚拟表
  
  １. 创建视图
    CREATE [OR REPLACE] VIEW 视图名　［字段名...］ AS 子查询
    ...]]></description><category></category></item><item><title><![CDATA[高级查询 SELECT]]></title><link>https://blog.youkuaiyun.com/verejava/article/details/80756015</link><guid>https://blog.youkuaiyun.com/verejava/article/details/80756015</guid><author>verejava</author><pubDate>Thu, 21 Jun 2018 09:56:49 +0800</pubDate><description><![CDATA[http://www.verejava.com/?id=1717413210274查询语句 SELECT
      
知识点:
  内连接(Inner Join)，外连接(Outer Join)，自连接(Self Join)，GROUP BY 和 having 查询，子查询 ，相关子查询，
获取最前面的指定行数记录，分页查询，查询结果操作 等
      
1. 连接查询 (内连接  Inner...]]></description><category></category></item><item><title><![CDATA[数据类型和函数]]></title><link>https://blog.youkuaiyun.com/verejava/article/details/80755993</link><guid>https://blog.youkuaiyun.com/verejava/article/details/80755993</guid><author>verejava</author><pubDate>Thu, 21 Jun 2018 09:55:41 +0800</pubDate><description><![CDATA[http://www.verejava.com/?id=1717412762063Mysql 数据类型和函数
   
知识点
  数据类型分类
    CHAR       
    VARCHAR       
    int       
    float       
    DATETIME      
    TIMESTAMP    
    TEXT        
    Blo...]]></description><category></category></item><item><title><![CDATA[DDL 约束条件]]></title><link>https://blog.youkuaiyun.com/verejava/article/details/80755975</link><guid>https://blog.youkuaiyun.com/verejava/article/details/80755975</guid><author>verejava</author><pubDate>Thu, 21 Jun 2018 09:54:47 +0800</pubDate><description><![CDATA[http://www.verejava.com/?id=17174122845821 . 约束条件
  Oracle数据库的约束包括:
    NOT NULL  非空约束  
    UNIQUE    唯一键约束 
    PRIMARY KEY 主键约束  ----重点
    FOREIGN KEY 外键约束  ----重点
      
  
  1. NOT NULL   如果一个字段...]]></description><category></category></item><item><title><![CDATA[MySql DDL DML基本命令]]></title><link>https://blog.youkuaiyun.com/verejava/article/details/80755938</link><guid>https://blog.youkuaiyun.com/verejava/article/details/80755938</guid><author>verejava</author><pubDate>Thu, 21 Jun 2018 09:53:47 +0800</pubDate><description><![CDATA[http://www.verejava.com/?id=1717411998521登录 MySQL 命令控制台
打开 cmd 命令console    
c:&amp;gt; mysql -uroot -p111111
  
创建一个名称为study的数据库。 
create database study; 
    
查看所有数据库 
show databases; 
    
创建一个使用utf-8字...]]></description><category></category></item><item><title><![CDATA[VereCached 之 入门安装]]></title><link>https://blog.youkuaiyun.com/verejava/article/details/80740949</link><guid>https://blog.youkuaiyun.com/verejava/article/details/80740949</guid><author>verejava</author><pubDate>Wed, 20 Jun 2018 07:47:22 +0800</pubDate><description><![CDATA[http://www.verejava.com/?id=17112285674021. 下载并解压  VereCached.zip 文件 


2.打开 VereCache.xml 

&amp;lt;?xml version=&quot;1.0&quot; encoding=&quot;UTF-8&quot;?&amp;gt;
&amp;lt;VereCache&amp;gt;
   &amp;lt;param key=&quot;MasterServer&quot; value=&quot;local.]]></description><category></category></item><item><title><![CDATA[VereORM 之 原生 SQL]]></title><link>https://blog.youkuaiyun.com/verejava/article/details/80740947</link><guid>https://blog.youkuaiyun.com/verejava/article/details/80740947</guid><author>verejava</author><pubDate>Wed, 20 Jun 2018 07:46:22 +0800</pubDate><description><![CDATA[http://www.verejava.com/?id=17093284304111. 安装见  VereORM 之 入门安装 

2.在 test/src 中新建一个 测试类  com.test.orm.Test6   

package com.test.orm;

import java.sql.ResultSet;
import java.util.ArrayList;
import ja...]]></description><category></category></item><item><title><![CDATA[VereORM 之 DAO 通过 CBean 实例化]]></title><link>https://blog.youkuaiyun.com/verejava/article/details/80740945</link><guid>https://blog.youkuaiyun.com/verejava/article/details/80740945</guid><author>verejava</author><pubDate>Wed, 20 Jun 2018 07:45:36 +0800</pubDate><description><![CDATA[http://www.verejava.com/?id=170461650842861. 安装见  VereORM 之 入门安装 

2.在 test/src 中新建一个DAO 接口  com.test.dao.UserDAO   

package com.test.dao;

import java.util.List;

import com.test.entity.User;

publi...]]></description><category></category></item><item><title><![CDATA[VereORM 之 DAO 数据访问封装类]]></title><link>https://blog.youkuaiyun.com/verejava/article/details/80740943</link><guid>https://blog.youkuaiyun.com/verejava/article/details/80740943</guid><author>verejava</author><pubDate>Wed, 20 Jun 2018 07:44:49 +0800</pubDate><description><![CDATA[http://www.verejava.com/?id=170460095081851. 安装见  VereORM 之 入门安装 

2.在 test/src 中新建一个DAO 接口  com.test.dao.UserDAO   

package com.test.dao;

import java.util.List;

import com.test.entity.User;

publi...]]></description><category></category></item><item><title><![CDATA[VereORM 之 事务处理]]></title><link>https://blog.youkuaiyun.com/verejava/article/details/80740942</link><guid>https://blog.youkuaiyun.com/verejava/article/details/80740942</guid><author>verejava</author><pubDate>Wed, 20 Jun 2018 07:44:04 +0800</pubDate><description><![CDATA[http://www.verejava.com/?id=170454701287841. 安装见  VereORM 之 入门安装 

2.在 test/src 中新建一个 测试类  com.test.orm.Test3   

package com.test.orm;

import java.util.Calendar;
import java.util.List;

import com.t...]]></description><category></category></item><item><title><![CDATA[VereORM 之 添加 删除 修改 查询]]></title><link>https://blog.youkuaiyun.com/verejava/article/details/80740940</link><guid>https://blog.youkuaiyun.com/verejava/article/details/80740940</guid><author>verejava</author><pubDate>Wed, 20 Jun 2018 07:43:21 +0800</pubDate><description><![CDATA[http://www.verejava.com/?id=170453787906831. 安装见  VereORM 之 入门安装 

2.在 test/src 中新建一个 测试类  com.test.orm.Test2   

package com.test.orm;

import java.util.Calendar;
import java.util.List;

import com.t...]]></description><category></category></item><item><title><![CDATA[至简 VereORM 对象持久映射框架]]></title><link>https://blog.youkuaiyun.com/verejava/article/details/80740936</link><guid>https://blog.youkuaiyun.com/verejava/article/details/80740936</guid><author>verejava</author><pubDate>Wed, 20 Jun 2018 07:42:23 +0800</pubDate><description><![CDATA[http://www.verejava.com/?id=170446397577821. 下载并解压  VereORM.zip 文件 


2.打开 Eclipse 新建一个 test 项目   Eclipse -&amp;gt; File -&amp;gt; New -&amp;gt; Dynamic Web Project 


3.将解压后 VereORM 和 VereORM/lib 目录下面的  jar 包拷贝到...]]></description><category></category></item><item><title><![CDATA[VereMVC 之 拦截器Interceptor 拦截 Action 和 方法]]></title><link>https://blog.youkuaiyun.com/verejava/article/details/80728332</link><guid>https://blog.youkuaiyun.com/verejava/article/details/80728332</guid><author>verejava</author><pubDate>Tue, 19 Jun 2018 08:59:44 +0800</pubDate><description><![CDATA[http://www.verejava.com/?id=16991288117251.打开 Eclipse 新建一个 test 项目   Eclipse -&amp;gt; File -&amp;gt; New -&amp;gt; Dynamic Web Project 


2.在 test/WebContent  下面新建一个 test.jsp 文件 

&amp;lt;%@ page language=&quot;java&quot; con...]]></description><category></category></item><item><title><![CDATA[VereMVC 之 I18 多语言国际化]]></title><link>https://blog.youkuaiyun.com/verejava/article/details/80728324</link><guid>https://blog.youkuaiyun.com/verejava/article/details/80728324</guid><author>verejava</author><pubDate>Tue, 19 Jun 2018 08:59:01 +0800</pubDate><description><![CDATA[http://www.verejava.com/?id=16991158600941.打开 Eclipse 新建一个 test 项目   Eclipse -&amp;gt; File -&amp;gt; New -&amp;gt; Dynamic Web Project 


2.在 test/src下面新建两个多语言国际化xml文件 message_zh_CN.xml , message_en_US.xml 

mes...]]></description><category></category></item><item><title><![CDATA[VereMVC 之 多文件上传]]></title><link>https://blog.youkuaiyun.com/verejava/article/details/80728320</link><guid>https://blog.youkuaiyun.com/verejava/article/details/80728320</guid><author>verejava</author><pubDate>Tue, 19 Jun 2018 08:58:22 +0800</pubDate><description><![CDATA[http://www.verejava.com/?id=16991023979331.打开 Eclipse 新建一个 test 项目   Eclipse -&amp;gt; File -&amp;gt; New -&amp;gt; Dynamic Web Project 


2.在 test/WebContent  下面新建一个 fileupload.jsp 文件 

&amp;lt;%@ page language=&quot;jav...]]></description><category></category></item><item><title><![CDATA[VereMVC 之 单文件上传]]></title><link>https://blog.youkuaiyun.com/verejava/article/details/80728308</link><guid>https://blog.youkuaiyun.com/verejava/article/details/80728308</guid><author>verejava</author><pubDate>Tue, 19 Jun 2018 08:57:19 +0800</pubDate><description><![CDATA[http://www.verejava.com/?id=16990409696221.打开 Eclipse 新建一个 test 项目   Eclipse -&amp;gt; File -&amp;gt; New -&amp;gt; Dynamic Web Project 


2.在 test/WebContent  下面新建一个 fileupload.jsp 文件 

&amp;lt;%@ page language=&quot;jav...]]></description><category></category></item><item><title><![CDATA[VereMVC 之 Get Post 参数获取类 CParam]]></title><link>https://blog.youkuaiyun.com/verejava/article/details/80728291</link><guid>https://blog.youkuaiyun.com/verejava/article/details/80728291</guid><author>verejava</author><pubDate>Tue, 19 Jun 2018 08:56:30 +0800</pubDate><description><![CDATA[http://www.verejava.com/?id=16990178048811.打开 Eclipse 新建一个 test 项目   Eclipse -&amp;gt; File -&amp;gt; New -&amp;gt; Dynamic Web Project 


2.在 test/WebContent  下面新建一个 user.jsp 文件 

&amp;lt;%@ page language=&quot;java&quot; con...]]></description><category></category></item><item><title><![CDATA[至简 VereMVC Java Web MVC 框架]]></title><link>https://blog.youkuaiyun.com/verejava/article/details/80728285</link><guid>https://blog.youkuaiyun.com/verejava/article/details/80728285</guid><author>verejava</author><pubDate>Tue, 19 Jun 2018 08:54:27 +0800</pubDate><description><![CDATA[http://www.verejava.com/?id=16977163604411. 下载并解压  VereMVC.zip 文件 


2.打开 Eclipse 新建一个 test 项目   Eclipse -&amp;gt; File -&amp;gt; New -&amp;gt; Dynamic Web Project 


3.将解压后 VereMVC/lib 目录下面的  jar 包拷贝到  test/WebC...]]></description><category></category></item><item><title><![CDATA[Java 设计模式 之 访问者模式]]></title><link>https://blog.youkuaiyun.com/verejava/article/details/80687388</link><guid>https://blog.youkuaiyun.com/verejava/article/details/80687388</guid><author>verejava</author><pubDate>Thu, 14 Jun 2018 07:26:27 +0800</pubDate><description><![CDATA[http://www.verejava.com/?id=16999202350980package com.visit.theory;

import java.util.ArrayList;

public class Test
{
	public static void main(String[] args)
	{
		ObjectStructure o = new ObjectStructu...]]></description><category></category></item></channel></rss>