使用SpringBoot配置多数据源的经验分享

1. 引入jar包

pom.xml文件

<?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 https://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.5.6</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>com.multi.datasource</groupId>
    <artifactId>demo</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>demo</name>
    <description>Demo project for Spring Boot</description>
    <properties>
        <java.version>1.8</java.version>
    </properties>
    <dependencies>

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

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

        <dependency>
            <groupId>org.mybatis.spring.boot</groupId>
            <artifactId>mybatis-spring-boot-starter</artifactId>
            <version>1.3.2</version>
        </dependency>

        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>druid</artifactId>
            <version>1.1.8</version>
        </dependency>

        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
        </dependency>

        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <version>1.16.22</version>
        </dependency>

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

    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
                <configuration>
                    <excludes>
                        <exclude>
                            <groupId>org.projectlombok</groupId>
                            <artifactId>lombok</artifactId>
                        </exclude>
                    </excludes>
                </configuration>
            </plugin>
        </plugins>
    </build>

</project>

2. properties配置

分别准备两个数据源

server.port=18888
mybatis.mapper-locations=classpath:mapper/*.xml

my1.datasource.url=jdbc:mysql://10.0.0.125:3306/wyl?autoReconnect=true
my1.datasource.driverClassName=com.mysql.cj.jdbc.Driver
my1.datasource.username=root
my1.datasource.password=123456

my2.datasource.url=jdbc:mysql://10.0.0.160:3306/wyl?autoReconnect=true
my2.datasource.driverClassName=com.mysql.cj.jdbc.Driver
my2.datasource.username=root
my2.datasource.password=123456

3. 分别配置两个数据源

第一个数据源

package com.multi.datasource.config;

import com.alibaba.druid.pool.DruidDataSource;
import org.apache.ibatis.session.SqlSessionFactory;
import org.mybatis.spring.SqlSessionFactoryBean;
import org.mybatis.spring.annotation.MapperScan;
import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.core.io.support.PathMatchingResourcePatternResolver;
import org.springframework.jdbc.datasource.DataSourceTransactionManager;

import javax.sql.DataSource;

@Configuration
@MapperScan(basePackages = My1DataSourceConfig.PACKAGE, sqlSessionFactoryRef = "my1SqlSessionFactory")
public class My1DataSourceConfig {

    static final String PACKAGE = "com.multi.datasource.dao.my1";
    static final String MAPPER_LOCATION = "classpath:mapper/*.xml";

    @Value("${my1.datasource.url}")
    private String url;

    @Value("${my1.datasource.username}")
    private String user;

    @Value("${my1.datasource.password}")
    private String password;

    @Value("${my1.datasource.driverClassName}")
    private String driverClass;

    @Bean(name = "my1DataSource")
    public DataSource my1DataSource() {
        DruidDataSource dataSource = new DruidDataSource();
        dataSource.setDriverClassName(driverClass);
        dataSource.setUrl(url);
        dataSource.setUsername(user);
        dataSource.setPassword(password);
        dataSource.setMaxWait(Integer.MAX_VALUE);
        dataSource.setTestOnBorrow(true);
        dataSource.setTestOnReturn(true);
        dataSource.setTestWhileIdle(true);
        return dataSource;
    }

    @Bean(name = "my1TransactionManager")
    public DataSourceTransactionManager my1TransactionManager() {
        return new DataSourceTransactionManager(my1DataSource());
    }

    @Bean(name = "my1SqlSessionFactory")
    public SqlSessionFactory my1SqlSessionFactory(@Qualifier("my1DataSource") DataSource my1DataSource)
            throws Exception {
        final SqlSessionFactoryBean sessionFactory = new SqlSessionFactoryBean();
        sessionFactory.setDataSource(my1DataSource);
        sessionFactory.setMapperLocations(
                new PathMatchingResourcePatternResolver().getResources(My1DataSourceConfig.MAPPER_LOCATION));
        return sessionFactory.getObject();
    }
}

第二个数据源

package com.multi.datasource.config;

import com.alibaba.druid.pool.DruidDataSource;
import org.apache.ibatis.session.SqlSessionFactory;
import org.mybatis.spring.SqlSessionFactoryBean;
import org.mybatis.spring.annotation.MapperScan;
import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.core.io.support.PathMatchingResourcePatternResolver;
import org.springframework.jdbc.datasource.DataSourceTransactionManager;

import javax.sql.DataSource;

@Configuration
@MapperScan(basePackages = My1DataSourceConfig.PACKAGE, sqlSessionFactoryRef = "my1SqlSessionFactory")
public class My1DataSourceConfig {

    static final String PACKAGE = "com.multi.datasource.dao.my1";
    static final String MAPPER_LOCATION = "classpath:mapper/*.xml";

    @Value("${my1.datasource.url}")
    private String url;

    @Value("${my1.datasource.username}")
    private String user;

    @Value("${my1.datasource.password}")
    private String password;

    @Value("${my1.datasource.driverClassName}")
    private String driverClass;

    @Bean(name = "my1DataSource")
    public DataSource my1DataSource() {
        DruidDataSource dataSource = new DruidDataSource();
        dataSource.setDriverClassName(driverClass);
        dataSource.setUrl(url);
        dataSource.setUsername(user);
        dataSource.setPassword(password);
        dataSource.setMaxWait(Integer.MAX_VALUE);
        dataSource.setTestOnBorrow(true);
        dataSource.setTestOnReturn(true);
        dataSource.setTestWhileIdle(true);
        return dataSource;
    }

    @Bean(name = "my1TransactionManager")
    public DataSourceTransactionManager my1TransactionManager() {
        return new DataSourceTransactionManager(my1DataSource());
    }

    @Bean(name = "my1SqlSessionFactory")
    public SqlSessionFactory my1SqlSessionFactory(@Qualifier("my1DataSource") DataSource my1DataSource)
            throws Exception {
        final SqlSessionFactoryBean sessionFactory = new SqlSessionFactoryBean();
        sessionFactory.setDataSource(my1DataSource);
        sessionFactory.setMapperLocations(
                new PathMatchingResourcePatternResolver().getResources(My1DataSourceConfig.MAPPER_LOCATION));
        return sessionFactory.getObject();
    }
}

4. Dao目录

为了区分两个数据源，分别设置了不同的目录

package com.multi.datasource.dao.my1;

import com.multi.datasource.entity.UserEntity;
import org.apache.ibatis.annotations.Mapper;

@Mapper
public interface Test1Mapper {
    
    UserEntity query();
    
}

package com.multi.datasource.dao.my2;

import com.multi.datasource.entity.UserEntity;
import org.apache.ibatis.annotations.Mapper;

@Mapper
public interface Test2Mapper {
    
    UserEntity query();
    
}

5. Entity

package com.multi.datasource.entity;

import lombok.Data;

@Data
public class UserEntity {

    private String userName;

}

6. Mapper文件

从my1数据源查询

<?xml version="1.0" encoding="UTF-8"?>
        <!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="com.multi.datasource.dao.my1.Test1Mapper">

<select id="query" resultType="com.multi.datasource.entity.UserEntity">
        select user_name as userName from t_user
    </select>

</mapper>

从my2数据源查询

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="com.multi.datasource.dao.my2.Test2Mapper">
    
    <select id="query" resultType="com.multi.datasource.entity.UserEntity">
        select user_name as userName from t_user
    </select>
    
</mapper>

7. Controller测试

package com.multi.datasource.controller;

import com.multi.datasource.dao.my1.Test1Mapper;
import com.multi.datasource.dao.my2.Test2Mapper;
import com.multi.datasource.entity.UserEntity;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

import javax.annotation.Resource;

@RestController
public class TestController {

    @Resource
    private Test1Mapper test1Mapper;

    @Resource
    private Test2Mapper test2Mapper;

    @RequestMapping("query")
    public void query() {
        UserEntity user1 = test1Mapper.query();
        System.out.println("my1 dataSource:" + user1);


        UserEntity user2 = test2Mapper.query();
        System.out.println("my2 dataSource:" + user2);
    }

}

两个数据源，对应的user_name分别是zhangsan和lisi

在这里插入图片描述