spring3+hibernate4+maven+junit 多库/多数据源实现

1.核心思想：
[quote="思路"]通过spring对多数据源的管理，在dao中动态的指定相对应的datasource。[/quote]
2.动态指定数据源的方法约定：
[quote="约定"]不同库的dao放到对应的包下例：Master库中的dao的包路径是com.***.db.master.*。slave库的dao包的路径应是com.***.db.slave.***。[/quote]
[quote="判定数据原方法"]判定dao类的路径是否包含master或者slave从而加载对应的数据源[/quote]
3.实现代码

private void fixSession(){
	String name=this.getClass().getName();
	/**
	 * 如果是master 包下的dao 全部指定为 masterSessionFactory
	 */
	if(name.indexOf("com.xkorey.db.master")>-1){
	    sessionFactory = masterSessionFactory;
	}
	/**
	 * 默认的dao是 slaveSessionFactory 下的库
	 */
	else{
	    sessionFactory =  slaveSessionFactory;
	}
    }

4.这样实现的缺点，暂时还未想到。欢迎网友补充。
[quote="缺陷"]未知[/quote]
5.开始贴代码，附件(hsm.zip)是eclipse下的项目工程包。
6.建库、表sql

--create database

-- master database
create database master character set `gbk` collate `gbk_chinese_ci`;
-- slave database
create database slave character set `gbk` collate `gbk_chinese_ci`;


-- create tables 
use master;
create table users(
id int not null auto_increment,
name varchar(20),
age int,
primary key(id)) ENGINE = INNODB,AUTO_INCREMENT=1000;

use slave;
create table user_info(
id int not null auto_increment,
uid int,
info varchar(20),
primary key(id)) ENGINE = INNODB,AUTO_INCREMENT=1000;


--insert data

use master;
insert into users(name,age) values('xkorey',28);
use slave;
insert into user_info(uid,info) values(1000,'hello xkorey.');

7.maven jar包依赖 pom.xml

  xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
  4.0.0
  hsm
  hsm
  war
  0.0.1-SNAPSHOT
  hsm Maven Webapp
  http://maven.apache.org
  
    
      junit
      junit
      3.8.1
      test
    

    	
    
	 	org.springframework
	 	spring-context
	 	3.2.3.RELEASE
	 
	
		org.springframework
		spring-context-support
		3.2.3.RELEASE
	
	
		org.springframework
		spring-orm
		3.2.3.RELEASE
	
	
		org.springframework
		spring-webmvc
		3.2.3.RELEASE
	
	
		org.springframework
		spring-web
		3.2.3.RELEASE
	
	
		org.springframework.security
		spring-security-core
		3.1.4.RELEASE
	
	
		org.springframework
		spring-tx
		3.2.3.RELEASE
	
	
		org.springframework
		spring-test
		3.2.1.RELEASE
		
	
		org.aspectj
		aspectjweaver
		1.7.2
	





	
	
	org.hibernate
	hibernate-core
	4.2.2.Final
	
	
		org.hibernate
		hibernate-validator
		4.2.0.Final
	






	
	
		mysql
		mysql-connector-java
		5.1.25
	


  
  
    hsm
  

8.spring配置文件

       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xmlns:aop="http://www.springframework.org/schema/aop"
       xmlns:tx="http://www.springframework.org/schema/tx"
       xmlns:context="http://www.springframework.org/schema/context"
       xsi:schemaLocation="
       http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.2.xsd
       http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-3.2.xsd
       http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-3.2.xsd
       http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.2.xsd
       ">

	
	        
	            
	                classpath:hsm-db-master.properties
	                classpath:hsm-db-slave.properties
	            
	        
	

	

	

     
    


    

       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xmlns:aop="http://www.springframework.org/schema/aop"
       xmlns:tx="http://www.springframework.org/schema/tx"
       xmlns:context="http://www.springframework.org/schema/context"
       xsi:schemaLocation="
       http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.2.xsd
       http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-3.2.xsd
       http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-3.2.xsd
       http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.2.xsd
       ">

    
    
        ${connection.master.driver_class}
        ${connection.master.url}
        ${connection.master.username}
        ${connection.master.password}
        
     
    
        
        
        
        
            ${hibernate.master.dialect}
            true
        
        
     
    
    
    
        
     

       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xmlns:aop="http://www.springframework.org/schema/aop"
       xmlns:tx="http://www.springframework.org/schema/tx"
       xmlns:context="http://www.springframework.org/schema/context"
       xsi:schemaLocation="
       http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.2.xsd
       http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-3.2.xsd
       http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-3.2.xsd
       http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.2.xsd
       ">

    
    
        ${connection.slave.driver_class}
        ${connection.slave.url}
        ${connection.slave.username}
        ${connection.slave.password}
        
     
    
        
        
        
        
            ${hibernate.slave.dialect}
            true
        
        
     
    
    
    
        
    

9.properties 配置文件

hibernate.master.dialect=org.hibernate.dialect.MySQLInnoDBDialect


connection.master.driver_class=com.mysql.jdbc.Driver
connection.master.url=jdbc:mysql://localhost:3306/master?useUnicode=true&characterEncoding=gbk
connection.master.username=root
connection.master.password=这里是你连库的密码

hibernate.slave.dialect=org.hibernate.dialect.MySQLInnoDBDialect


connection.slave.driver_class=com.mysql.jdbc.Driver
connection.slave.url=jdbc:mysql://localhost:3306/slave?useUnicode=true&characterEncoding=gbk
connection.slave.username=root
connection.slave.password=这里是你连库的密码

10.java 代码 略去 java bean 即spring中的model代码只贴 dao 。

父类dao

public class GenericDao {


    @Autowired
    @Qualifier("masterSessionFactory")
    private SessionFactory masterSessionFactory;


    @Autowired
    @Qualifier("slaveSessionFactory")
    private SessionFactory slaveSessionFactory;


    private SessionFactory sessionFactory;


    private void fixSession(){
	String name=this.getClass().getName();
	/**
	 * 如果是master 包下的dao 全部指定为 masterSessionFactory
	 */
	if(name.indexOf("com.xkorey.db.master")>-1){
	    sessionFactory = masterSessionFactory;
	}
	/**
	 * 默认的dao是 slaveSessionFactory 下的库
	 */
	else{
	    sessionFactory =  slaveSessionFactory;
	}
    }

    public Session getSession() {
	fixSession();
        return sessionFactory.getCurrentSession();
    }

注意UsersDao的包路径是 [color=red]package com.xkorey.db.master.dao;[/color]

@Repository("UsersDao")
public class UsersDao extends GenericDao{
//根据网友建议其实也可以在dao中直接注入 sessionFactory 像这样
//  @Autowired
//  @Qualifier("masterSessionFactory")
//  private SessionFactory sessionFactory;
}

注意UserinfoDao的包路径是 [color=red]package com.xkorey.db.slave.dao;[/color]

@Repository("UserinfoDao")
public class UserinfoDao extends GenericDao{
// 根据网友建议实也可以在dao中直接注入 sessionFactory 像这样
//    @Autowired
//    @Qualifier("slaveSessionFactory")
//    private SessionFactory sessionFactory;
}

@Service("UsersService")
@Transactional(value="masterTransactionManager")
public class UsersService {

    @Autowired
    @Qualifier("UsersDao")
    private UsersDao usersDao;

    public int findUserAgeById(int id){
	Users users = (Users) usersDao.getSession().get(Users.class,id);
	return users.age;
    }
}

@Service("UserinfoService")
@Transactional(value="slaveTransactionManager")
public class UserinfoService {

    @Autowired
    @Qualifier("UserinfoDao")
    private UserinfoDao userinfoDao;

    public String findUserInfoById(int id){
	Userinfo userinfo = (Userinfo) userinfoDao.getSession().get(Userinfo.class,id);
	return userinfo.info;
    }
}

11.junit 测试类

@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration(locations={"classpath:spring-base.xml"})
public class TestDao {


    @Autowired
    @Qualifier("UsersService")
    private UsersService usersService;

    @Autowired
    @Qualifier("UserinfoService")
    private UserinfoService userinfoService;


    @Test
    public void testMutilDataSource(){
	int id=1000;
	System.out.println(usersService.findUserAgeById(id));
	System.out.println(userinfoService.findUserInfoById(id));
    }


}

测试类运行结果：

Hibernate: select users0_.id as id1_0_0_, users0_.age as age2_0_0_, users0_.name as name3_0_0_ from users users0_ where users0_.id=?
28
Hibernate: select userinfo0_.id as id1_0_0_, userinfo0_.info as info2_0_0_, userinfo0_.uid as uid3_0_0_ from user_info userinfo0_ where userinfo0_.id=?
hello xkorey.

截图：
[img]http://dl2.iteye.com/upload/attachment/0087/8467/ad7972b4-d482-3219-8b3b-6212a1fc4985.png[/img]

12.最后贴张工程截图

[img]http://dl2.iteye.com/upload/attachment/0087/8469/dfb99aaa-3300-380e-90cd-d92f128a0fc0.png[/img]

13.项目环境
jdk7,eclipse Version: Kepler Release.maven:apache-maven-3.0.4