springboot-mybatis整合多数据源方式之一配置法（亦称分包方式）

环境： intellij idea 2017.1.4 + spring boot 2.0

1 文档结构图：

2 数据库配置相关类

先在application.properties 文件中添加数据库的配置

## db1 database
spring.datasource.db1.jdbc-url=jdbc:mysql://localhost:3306/test?useUnicode=true&characterEncoding=UTF-8
spring.datasource.db1.username=root
spring.datasource.db1.password=
spring.datasource.db1.driver-class-name=com.mysql.jdbc.Driver
## db2 database
spring.datasource.db2.jdbc-url=jdbc:mysql://localhost:3306/news?useUnicode=true&characterEncoding=UTF-8
spring.datasource.db2.username=root
spring.datasource.db2.password=
spring.datasource.db2.driver-class-name=com.mysql.jdbc.Driver

注意项： spring.datasource.db1.jdbc-url 数据库地址要这么写，而不是 spring.datasource.url 

否则运行时会报如下的错误：“jdbcUrl is required with driverClassName.”

在datasouce目录下增加DataSourceConfig1,DataSourceConfig2文件,如下：

DataSourceConfig1:

package com.neo.datasource;

import org.apache.ibatis.session.SqlSessionFactory;
import org.mybatis.spring.SqlSessionFactoryBean;
import org.mybatis.spring.SqlSessionTemplate;
import org.mybatis.spring.annotation.MapperScan;
import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.boot.jdbc.DataSourceBuilder;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.Primary;
import org.springframework.core.io.support.PathMatchingResourcePatternResolver;

import javax.sql.DataSource;

//表示这个类为一个配置类
@Configuration
// 配置mybatis的接口类放的地方
@MapperScan(basePackages = "com.neo.mapper.db1", sqlSessionFactoryRef = "db1SqlSessionFactory")
public class DataSourceConfig1 {
    // 将这个对象放入Spring容器中
    @Bean(name = "db1DataSource")
    // 表示这个数据源是默认数据源
    @Primary
    // 读取application.properties中的配置参数映射成为一个对象
    // prefix表示参数的前缀
    @ConfigurationProperties(prefix = "spring.datasource.db1")
    public DataSource getDateSource1() {
        return DataSourceBuilder.create().build();
    }
    @Bean(name = "db1SqlSessionFactory")
    // 表示这个数据源是默认数据源
    @Primary
    // @Qualifier表示查找Spring容器中名字为test1DataSource的对象
    public SqlSessionFactory db1SqlSessionFactory(@Qualifier("db1DataSource") DataSource datasource)
            throws Exception {
        SqlSessionFactoryBean bean = new SqlSessionFactoryBean();
        bean.setDataSource(datasource);
        bean.setMapperLocations(
                // 设置mybatis的xml所在位置
                new PathMatchingResourcePatternResolver().getResources("classpath*:mapper/db1/*.xml"));
        return bean.getObject();
    }
    @Bean("db1SqlSessionTemplate")
    // 表示这个数据源是默认数据源
    @Primary
    public SqlSessionTemplate db1sqlsessiontemplate(
            @Qualifier("db1SqlSessionFactory") SqlSessionFactory sessionfactory) {
        return new SqlSessionTemplate(sessionfactory);
    }
}

DataSourceConfig2:

package com.neo.datasource;

/**
 * Created by xxx on 2019/3/15.
 */

import org.apache.ibatis.session.SqlSessionFactory;
import org.mybatis.spring.SqlSessionFactoryBean;
import org.mybatis.spring.SqlSessionTemplate;
import org.mybatis.spring.annotation.MapperScan;
import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.boot.jdbc.DataSourceBuilder;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.Primary;
import org.springframework.core.io.support.PathMatchingResourcePatternResolver;

import javax.sql.DataSource;



//表示这个类为一个配置类
@Configuration
// 配置mybatis的接口类放的地方
@MapperScan(basePackages = "com.neo.mapper.db2", sqlSessionFactoryRef = "db2SqlSessionFactory")
public class DataSourceConfig2 {
    // 将这个对象放入Spring容器中
    @Bean(name = "db2DataSource")
    // 表示这个数据源是默认数据源

    // 读取application.properties中的配置参数映射成为一个对象
    // prefix表示参数的前缀
    @ConfigurationProperties(prefix = "spring.datasource.db2")
    public DataSource getDateSource2() {
        return DataSourceBuilder.create().build();
    }
    @Bean(name = "db2SqlSessionFactory")
    // 表示这个数据源是默认数据源

    // @Qualifier表示查找Spring容器中名字为test1DataSource的对象
    public SqlSessionFactory db2SqlSessionFactory(@Qualifier("db2DataSource") DataSource datasource)
            throws Exception {
        SqlSessionFactoryBean bean = new SqlSessionFactoryBean();
        bean.setDataSource(datasource);
        bean.setMapperLocations(
                // 设置mybatis的xml所在位置
                new PathMatchingResourcePatternResolver().getResources("classpath*:mapper/db2/*.xml"));
        return bean.getObject();
    }
    @Bean("db2SqlSessionTemplate")
    // 表示这个数据源是默认数据源
    @Primary
    public SqlSessionTemplate db2sqlsessiontemplate(
            @Qualifier("db2SqlSessionFactory") SqlSessionFactory sessionfactory) {
        return new SqlSessionTemplate(sessionfactory);
    }
}

实体表操作相关类文件

entity:

package com.neo.entity;

import org.springframework.stereotype.Component;


@Component
public class User {
    private Long id;
    private String username;
    private int age;
    public Long getId() {
        return id;
    }
    public void setId(Long id) {
        this.id = id;
    }
    public String getUsername() {
        return username;
    }
    public void setUsername(String username) {
        this.username = username;
    }
    public int getAge() {
        return age;
    }
    public void setAge(int age) {
        this.age = age;
    }
}

package com.neo.entity;

import org.springframework.stereotype.Component;


@Component
public class Sound {
    private Long id;

    public Long getId() {
        return id;
    }

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

    public String getTitle() {
        return title;
    }

    public void setTitle(String title) {
        this.title = title;
    }

    private String title;
}

resource/mapper/db1/user.xml

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://www.mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="com.neo.mapper.db1.UserMapper">
    <select id="getUser" resultType="com.neo.entity.User">
        select * from user
        <where>
            <if test="username != null">
                username=#{username}
            </if>

            <if test="age!= null">
                and age=#{age}
            </if>
        </where>
    </select>
    <delete id="deleteUser" parameterType="Integer">
        delete from user where id =#{id}
    </delete>
    <insert id="addUser" parameterType="com.neo.entity.User">
    insert into user(id,username,age)values(#{id},#{username},#{age})
</insert>
    <update id="updateUser" parameterType="com.neo.entity.User">
        update user
        <set>
            <if test = "username != null">
                user.username = #{username},
            </if>
            <if test = "age != 0">
                user.age = #{age}
            </if>
        </set>
        where id = #{id}
    </update>
</mapper>

resource/mapper/db2/sound.xml

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://www.mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="com.neo.mapper.db2.SoundMapper">
    <select id="getSound" resultType="com.neo.entity.Sound">
        select * from t_sound
        <where>
            <if test="title != null">
                title=#{title}
            </if>

            <if test="id!= null">
                and id=#{id}
            </if>
        </where>
    </select>
    <delete id="deleteSound" parameterType="Integer">
        delete from t_sound where id =#{id}
    </delete>
    <insert id="addSound" parameterType="com.neo.entity.Sound">
    insert into t_sound(id,title)values(#{id},#{title})
</insert>
    <update id="updateSound" parameterType="com.neo.entity.Sound">
        update t_sound
        <set>
            <if test = "title != null">
                sound.title = #{title},
            </if>
        </set>
        where id = #{id}
    </update>
</mapper>

mapper/db1/UserMapper

package com.neo.mapper.db1;

import com.neo.entity.User;
import org.apache.ibatis.annotations.*;

import java.util.List;

@Mapper
public interface  UserMapper {
    //获取用户名单
    public List<User> getUser() throws Exception;
    //根据id删除用户
    public void deleteUser(int id)throws Exception;
    //新增用户
    public void addUser(User user)throws Exception;

    //修改用户信息
    public void updateUser(User user) throws Exception;

//    //用注解实现的
//    //获取用户名单
//    @Select("select * from user")
//    public List<User> getUser() throws Exception;
//    //根据id删除用户
//    @Delete("delete from user where id = #{id}")
//    public void deleteUser(int id)throws Exception;
//    //新增用户
//    @Insert("insert into user(id,username,age)values(#{id},#{username},#{age})")
//    public void addUser(User user)throws Exception;
//    //修改用户信息
//    @Update("update user set username = #{name} where id = #{id}")
//    public void updateUser(User user) throws Exception;
}

mapper/db2/SoundMapper

package com.neo.mapper.db2;

import com.neo.entity.Sound;
import org.apache.ibatis.annotations.Mapper;

import java.util.List;


@Mapper
public interface SoundMapper {
    //获取列表
    public List<Sound> getSound() throws Exception;
    //根据id删除
    public void deleteSound(int id)throws Exception;
    //新增
    public void addSound(Sound sound)throws Exception;

    //修改信息
    //public void updateSound(Sound sound) throws Exception;

}

service 这里没有分文件夹，也可以分

UserService:

package com.neo.service;

import com.neo.entity.User;

import java.util.List;


public interface UserService {
    //显示所有用户
    public List<User> getUser()throws Exception;
    //根据id删除用户
    public void deleteUser(int id)throws Exception;
    //新增用户
    public void addUser(User user)throws Exception;
}

package com.neo.service;

import com.neo.entity.User;
import com.neo.mapper.db1.UserMapper;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.util.List;


@Service
public class UserServiceImpl implements UserService {

    @Autowired
    private UserMapper userMapper;
    @Override
    public List<User> getUser() throws Exception {
        return userMapper.getUser();
    }
    //根据id删除用户
    @Override
    public void deleteUser(int id) throws Exception {
        userMapper.deleteUser(id);
    }
    //新增用户
    @Override
    public void addUser(User user) throws Exception {
        userMapper.addUser(user);
    }
}

SoundService:

package com.neo.service;

import com.neo.entity.Sound;
import com.neo.entity.User;

import java.util.List;


public interface SoundService {
    //显示所有用户
    public List<Sound> getSound()throws Exception;
    //根据id删除用户
    public void deleteSound(int id)throws Exception;
    //新增用户
    public void addSound(Sound sound)throws Exception;
}

package com.neo.service;

import com.neo.entity.Sound;
import com.neo.mapper.db2.SoundMapper;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.util.List;


@Service
public class SoundServiceImpl implements SoundService {

    @Autowired
    private SoundMapper soundMapper;
    @Override
    public List<Sound> getSound() throws Exception {
        return soundMapper.getSound();
    }
    //根据id删除用户
    @Override
    public void deleteSound(int id) throws Exception {
        soundMapper.deleteSound(id);
    }
    //新增用户
    @Override
    public void addSound(Sound sound) throws Exception {
        soundMapper.addSound(sound);
    }
}

controller

UserController:

package com.neo.controller;

import com.neo.entity.User;
import com.neo.service.UserService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

import java.util.List;


@RestController
public class UserController {

    @Autowired
    private UserService userService;
    @Autowired
    private User user;
    //显示用户
    @RequestMapping("list")
    public List<User> index() throws Exception {
        return userService.getUser();
    }
    //删除用户
    @RequestMapping("delete/{id}")
    public String delete(@PathVariable int id) throws Exception {
        userService.deleteUser(id);
        return "你已经删掉了id为"+id+"的用户";
    }
    //增加用户
    @RequestMapping("addUser")
    public String addUser() throws Exception {
        user.setAge(33);
        user.setUsername("阿花");
        userService.addUser(user);
        return "增加用户";
    }
}

SoundController:

package com.neo.controller;

import com.neo.entity.Sound;
import com.neo.service.SoundService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

import java.util.List;


@RestController
public class SoundController {

    @Autowired
    private SoundService soundService;
    @Autowired
    private Sound sound;
    //显示用户
    @RequestMapping("sound/list")
    public List<Sound> index() throws Exception {
        return soundService.getSound();
    }

    //增加用户
    @RequestMapping("sound/add")
    public String addSound() throws Exception {
        sound.setTitle("平凡之路");
        soundService.addSound(sound);
        return "增加";
    }
}

pom.xml如下：

<?xml version="1.0" encoding="UTF-8"?>
<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/xsd/maven-4.0.0.xsd">
	<modelVersion>4.0.0</modelVersion>

	<groupId>com.neo</groupId>
	<artifactId>spring-boot-hello</artifactId>
	<version>1.0</version>
	<packaging>jar</packaging>

	<name>spring-boot-hello</name>
	<description>Demo project for Spring Boot</description>

	<parent>
		<groupId>org.springframework.boot</groupId>
		<artifactId>spring-boot-starter-parent</artifactId>
		<version>2.0.0.RELEASE</version>
	</parent>

	<properties>
		<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
		<java.version>1.8</java.version>
	</properties>

	<dependencies>
	     <dependency>
	        <groupId>org.springframework.boot</groupId>
	        <artifactId>spring-boot-starter-web</artifactId>
	    </dependency>
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-test</artifactId>
			<scope>test</scope>
		</dependency>

		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter</artifactId>
		</dependency>

		<dependency>
			<groupId>org.mybatis.spring.boot</groupId>
			<artifactId>mybatis-spring-boot-starter</artifactId>
			<version>1.3.2</version>
		</dependency>
		<dependency>
			<groupId>mysql</groupId>
			<artifactId>mysql-connector-java</artifactId>
		</dependency>
		<dependency>
			<groupId>junit</groupId>
			<artifactId>junit</artifactId>
		</dependency>

	</dependencies>
	
	<build>
		<plugins>
			<plugin>
				<groupId>org.springframework.boot</groupId>
				<artifactId>spring-boot-maven-plugin</artifactId>
			</plugin>
		</plugins>
	</build>
	

</project>

至些所有的文件都ok了，编译运行 

http://localhost:8080/sound/list

http://localhost:8080/list

都正常显示，如果数据库表里没有数据，可以用add方法先添加。

附完整测试项目包地址： https://download.csdn.net/download/huwei2003/11074738

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