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

绝地灬酷狼 2022-02-26 17:22 182阅读 0赞

**环境： intellij idea 2017.1.4 + spring boot 2.0**

### 1 文档结构图： ###

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2h1d2VpMjAwMw_size_16_color_FFFFFF_t_70][]

### 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_sound_list]

[http://localhost:8080/list][http_localhost_8080_sound_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][https_download.csdn.net_download_huwei2003_11074738]

\--- end ---

[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2h1d2VpMjAwMw_size_16_color_FFFFFF_t_70]: /images/20220226/ce6b626d4fa54c67b3de6cf06ad10a8c.png
[http_localhost_8080_sound_list]: http://localhost:8080/sound/list
[https_download.csdn.net_download_huwei2003_11074738]: https://download.csdn.net/download/huwei2003/11074738