spring 配置双数据源

1.核心思想： 

思路 写道

通过spring对多数据源的管理，在dao中动态的指定相对应的datasource。

2.动态指定数据源的方法约定： 

约定 写道

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.***。

 

判定数据原方法 写道

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

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。 

缺陷 写道

未知

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 

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
  <modelVersion>4.0.0</modelVersion>
  <groupId>hsm</groupId>
  <artifactId>hsm</artifactId>
  <packaging>war</packaging>
  <version>0.0.1-SNAPSHOT</version>
  <name>hsm Maven Webapp</name>
  <url>http://maven.apache.org</url>
  <dependencies>
    <dependency>
      <groupId>junit</groupId>
      <artifactId>junit</artifactId>
      <version>3.8.1</version>
      <scope>test</scope>
    </dependency>

        <!-- spring  -->
    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-context</artifactId>
        <version>3.2.3.RELEASE</version>
    </dependency>
    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-context-support</artifactId>
        <version>3.2.3.RELEASE</version>
    </dependency>
    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-orm</artifactId>
        <version>3.2.3.RELEASE</version>
    </dependency>
    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-webmvc</artifactId>
        <version>3.2.3.RELEASE</version>
    </dependency>
    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-web</artifactId>
        <version>3.2.3.RELEASE</version>
    </dependency>
    <dependency>
        <groupId>org.springframework.security</groupId>
        <artifactId>spring-security-core</artifactId>
        <version>3.1.4.RELEASE</version>
    </dependency>
    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-tx</artifactId>
        <version>3.2.3.RELEASE</version>
    </dependency>
    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-test</artifactId>
        <version>3.2.1.RELEASE</version>
    </dependency>
    <dependency>
        <groupId>org.aspectj</groupId>
        <artifactId>aspectjweaver</artifactId>
        <version>1.7.2</version>
    </dependency>





    <!-- hibernate -->
    <dependency>
    <groupId>org.hibernate</groupId>
    <artifactId>hibernate-core</artifactId>
    <version>4.2.2.Final</version>
    </dependency>
    <dependency>
        <groupId>org.hibernate</groupId>
        <artifactId>hibernate-validator</artifactId>
        <version>4.2.0.Final</version>
    </dependency>






    <!-- mysql -->
    <dependency>
        <groupId>mysql</groupId>
        <artifactId>mysql-connector-java</artifactId>
        <version>5.1.25</version>
    </dependency>


  </dependencies>
  <build>
    <finalName>hsm</finalName>
  </build>
</project>

8.spring配置文件 

<beans xmlns="http://www.springframework.org/schema/beans"
       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
       ">

    <bean id="propertyConfigurer" class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">
            <property name="locations">
                <list>
                    <value>classpath:hsm-db-master.properties</value>
                    <value>classpath:hsm-db-slave.properties</value>
                </list>
            </property>
    </bean>

    <context:annotation-config />

    <context:component-scan base-package="com.xkorey.db" />

    <import resource="db-master.xml" />
    <import resource="db-slave.xml" />


    </beans>

<beans xmlns="http://www.springframework.org/schema/beans"
       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
       ">

    <!-- Hibernate Data Source -->
    <bean id="masterDataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource">
        <property name="driverClassName"><value>${connection.master.driver_class}</value></property>
        <property name="url"><value>${connection.master.url}</value></property>
        <property name="username"><value>${connection.master.username}</value></property>
        <property name="password"><value>${connection.master.password}</value></property>
    </bean>
     <!-- Hibernate Session Factory -->
    <bean id="masterSessionFactory" class="org.springframework.orm.hibernate4.LocalSessionFactoryBean">
        <property name="dataSource"><ref local="masterDataSource"/></property>
        <property name="packagesToScan" value="com.xkorey.db.master" />
        <property name="hibernateProperties">
        <props>
            <prop key="hibernate.dialect">${hibernate.master.dialect}</prop>
            <prop key="hibernate.show_sql">true</prop>
        </props>
        </property>
    </bean>
    <!-- Transaction manager for a single Hibernate SessionFactory (alternative to JTA) HibernateTransactionManager -->
    <tx:annotation-driven transaction-manager="masterTransactionManager"/>
    <bean id="masterTransactionManager" class="org.springframework.orm.hibernate4.HibernateTransactionManager">
        <property name="sessionFactory"><ref local="masterSessionFactory"/></property>
    </bean>
</beans>

<beans xmlns="http://www.springframework.org/schema/beans"
       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
       ">

    <!-- Hibernate Data Source -->
    <bean id="slaveDataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource">
        <property name="driverClassName"><value>${connection.slave.driver_class}</value></property>
        <property name="url"><value>${connection.slave.url}</value></property>
        <property name="username"><value>${connection.slave.username}</value></property>
        <property name="password"><value>${connection.slave.password}</value></property>
    </bean>
     <!-- Hibernate Session Factory -->
    <bean id="slaveSessionFactory" class="org.springframework.orm.hibernate4.LocalSessionFactoryBean">
        <property name="dataSource"><ref local="slaveDataSource"/></property>
        <property name="packagesToScan" value="com.xkorey.db.slave" />
        <property name="hibernateProperties">
        <props>
            <prop key="hibernate.dialect">${hibernate.slave.dialect}</prop>
            <prop key="hibernate.show_sql">true</prop>
        </props>
        </property>
    </bean>
    <!-- Transaction manager for a single Hibernate SessionFactory (alternative to JTA) HibernateTransactionManager -->
    <tx:annotation-driven transaction-manager="slaveTransactionManager"/>
    <bean id="slaveTransactionManager" class="org.springframework.orm.hibernate4.HibernateTransactionManager">
        <property name="sessionFactory"><ref local="slaveSessionFactory"/></property>
    </bean>
</beans>

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<T extends java.io.Serializable> {


    @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 package com.xkorey.db.master.dao; 

@Repository("UsersDao")
public class UsersDao extends GenericDao<Users>{
//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 package com.xkorey.db.slave.dao; 

@Repository("UserinfoDao")
public class UserinfoDao extends GenericDao<Userinfo>{
// 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： 


12.最后贴张工程截图 

 

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

 转载于：http://xkorey.iteye.com/blog/1920059