Spring+MyBatis多数据源配置实现

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　　最近用到了MyBatis配置多数据源，原以为简单配置下就行了，实际操作后发现还是要费些事的，这里记录下，以作备忘。不多废话，直接上代码，后面会有简单的实现介绍。
一.log4j2.xml

 

二.database.properties

jdbc.mysql.driver=com.mysql.jdbc.Driver  
jdbc.mysql.url=jdbc:mysql://192.168.235.1:3306/hbatis?characterEncoding=utf8  
jdbc.mysql.username=hbatis  
jdbc.mysql.password=hbatis12345  
  
jdbc.mysql.driver2=com.mysql.jdbc.Driver  
jdbc.mysql.url2=jdbc:mysql://192.168.235.2:3306/hbatis?characterEncoding=utf8  
jdbc.mysql.username2=hbatis  
jdbc.mysql.password2=hbatis12345 

jdbc.initialSize=5
jdbc.minIdle=5
#druid not need jdbc.maxIdle
#jdbc.maxIdle=20
jdbc.maxActive=100
jdbc.maxWait=100000
jdbc.defaultAutoCommit=false
jdbc.removeAbandoned=true
jdbc.removeAbandonedTimeout=600
jdbc.testWhileIdle=true
jdbc.timeBetweenEvictionRunsMillis=60000
jdbc.numTestsPerEvictionRun=20
jdbc.minEvictableIdleTimeMillis=300000

 

三.单数据源时的Spring配置文件

 

四.多数据源时Spring配置文件

 

五.MultipleDataSource实现

package com.bijian.study.dao;

import org.springframework.jdbc.datasource.lookup.AbstractRoutingDataSource;

public class MultipleDataSource extends AbstractRoutingDataSource {
	
    private static final ThreadLocal dataSourceKey = new InheritableThreadLocal();

    public static void setDataSourceKey(String dataSource) {
        dataSourceKey.set(dataSource);
    }

    @Override
    protected Object determineCurrentLookupKey() {
        return dataSourceKey.get();
    }
}

 

六.MyBatis接口

package com.bijian.study.dao;

import java.util.List;

import com.bijian.study.model.Article;
import com.bijian.study.model.User;

public interface IUserMapper {

    User getUserById(int id);
    
    List getUsers(String name);
    
    int addUser(User user);
    
    int updateUser(User user);
    
    int deleteUser(int id);
    
    List
 getArticlesByUserId(int id);
}

package com.bijian.study.dao;

import java.util.List;

import com.bijian.study.model.Article;
import com.bijian.study.model.User;

public interface IUserMapper2 {

    User getUserById(int id);
    
    List getUsers(String name);
    
    int addUser(User user);
    
    int updateUser(User user);
    
    int deleteUser(int id);
    
    List
 getArticlesByUserId(int id);
}

 

七.Entity实体及Mapping配置

　　Article.java

package com.bijian.study.model;

public class Article {

    private int id;
    private User user;
    private String title;
    private String content;
    
    public int getId() {
        return id;
    }
    public void setId(int id) {
        this.id = id;
    }
    public User getUser() {
        return user;
    }
    public void setUser(User user) {
        this.user = user;
    }
    public String getTitle() {
        return title;
    }
    public void setTitle(String title) {
        this.title = title;
    }
    public String getContent() {
        return content;
    }
    public void setContent(String content) {
        this.content = content;
    }
}

　　User.java

package com.bijian.study.model;

public class User {
    
    private int id;
    private String name;
    private int age;
    private String address;
    
    public int getId() {
        return id;
    }

    public void setId(int id) {
        this.id = id;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public int getAge() {
        return age;
    }

    public void setAge(int age) {
        this.age = age;
    }

    public String getAddress() {
        return address;
    }

    public void setAddress(String address) {
        this.address = address;
    }

    // 如果有带参数的构造器，编译器不会自动生成无参构造器。当查询需要返回对象时，ORM框架用反射来调用对象的无参构造函数，导致异常：java.lang.NoSuchMethodException: com.bijian.study.model.User.()
    // 这时需要明确写出：
    public User() {
    }

    public User(int id, String address) {
        this.id = id;
        this.address = address;
    }

    public User(String name, int age, String address) {
        this.name = name;
        this.age = age;
        this.address = address;
    }
}

　　User.xml

	
		select *
		from `user` where id = #{id}
	

	
		
		
		
		
	

	
		select * from `user` where name like #{name}
	
	
	
		
		insert into user(name,age,address) values(#{name},#{age},#{address})
	

	
		update `user` set name=#{name}, age=#{age}, address=#{address}
		where id=#{id}
	
	
	
		delete from `user` where id=#{id}
	
	
	
	    
	    
	    
	    
	    
	    
	    
	    
	
	
	
	    select u.id, u.name, u.age, u.address, a.id a_id, a.title, a.content
	    from article a
	    inner join user u
	    on a.user_id=u.id and u.id=#{id}
	

　　User2.xml

	
		select *
		from `user` where id = #{id}
	

	
		
		
		
		
	

	
		select * from `user` where name like #{name}
	
	
	
		
		insert into user(name,age,address) values(#{name},#{age},#{address})
	

	
		update `user` set name=#{name}, age=#{age}, address=#{address}
		where id=#{id}
	
	
	
		delete from `user` where id=#{id}
	
	
	
	    
	    
	    
	    
	    
	    
	    
	    
	
	
	
	    select u.id, u.name, u.age, u.address, a.id a_id, a.title, a.content
	    from article a
	    inner join user u
	    on a.user_id=u.id and u.id=#{id}
	

 

八.手动数据源切换调用

package com.bijian.test;

import java.util.List;

import javax.sql.DataSource;

import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

import com.bijian.study.dao.IUserMapper;
import com.bijian.study.dao.IUserMapper2;
import com.bijian.study.dao.MultipleDataSource;
import com.bijian.study.model.Article;

public class Main {
	
    public static void main(String[] args) {
    	
        //初始化ApplicationContext
        ApplicationContext applicationContext = new ClassPathXmlApplicationContext("file:E:/develop/eclipse/workspace/SpringMVC/WebContent/WEB-INF/applicationContext.xml");

        DataSource mySqlDataSource = (DataSource)applicationContext.getBean("mySqlDataSource");
        System.out.println("mySqlDataSource:" + mySqlDataSource);
        
        
        IUserMapper mySqlMapper = applicationContext.getBean(IUserMapper.class);

        IUserMapper2 mySqlMapper2 = applicationContext.getBean(IUserMapper2.class);
        
        //设置数据源为MySql,使用了AOP测试时请将下面这行注释
        MultipleDataSource.setDataSourceKey("mySqlDataSource");
        List
 articles = mySqlMapper.getArticlesByUserId(1);
        for(Article acticle : articles) {
        	System.out.println(acticle.getTitle());
        }
        
        //设置数据源为SqlServer,使用AOP测试时请将下面这行注释
        MultipleDataSource.setDataSourceKey("mySql2DataSource");
        List
 articles2 = mySqlMapper2.getArticlesByUserId(2);
        for(Article acticle : articles2) {
        	System.out.println(acticle.getTitle());
        }
    }
}

　　运行结果如下：

title1
title2
title3
title4
test1
test2
test3
test4

　　结合如下对应数据库中的数据不难发现运行结果正确。

　　jdbc.mysql.url对应的数据库表数据如下所示：

　　jdbc.mysql.url2对应的数据库表数据如下所示：

PS：上面是dbcp数据连接池，我们可以改成druid连接池如下，这里引用的是druid-1.1.3.jar

　　运行Main.java结果如下：

14:20:24.422 [main] INFO  com.alibaba.druid.pool.DruidDataSource - {dataSource-1} inited
14:20:24.632 [main] INFO  com.alibaba.druid.pool.DruidDataSource - {dataSource-2} inited
mySqlDataSource:{
	CreateTime:"2018-12-23 14:20:23",
	ActiveCount:0,
	PoolingCount:5,
	CreateCount:5,
	DestroyCount:0,
	CloseCount:0,
	ConnectCount:0,
	Connections:[
		{ID:1207231495, ConnectTime:"2018-12-23 14:20:24", UseCount:0, LastActiveTime:"2018-12-23 14:20:24"},
		{ID:756936249, ConnectTime:"2018-12-23 14:20:24", UseCount:0, LastActiveTime:"2018-12-23 14:20:24"},
		{ID:1221981006, ConnectTime:"2018-12-23 14:20:24", UseCount:0, LastActiveTime:"2018-12-23 14:20:24"},
		{ID:264394929, ConnectTime:"2018-12-23 14:20:24", UseCount:0, LastActiveTime:"2018-12-23 14:20:24"},
		{ID:1878413714, ConnectTime:"2018-12-23 14:20:24", UseCount:0, LastActiveTime:"2018-12-23 14:20:24"}
	]
}
title1
title2
title3
title4
test1
test2
test3
test4

 

参考文章：http://www.cnblogs.com/lzrabbit/p/3750803.html

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