依赖:

        <dependency>
            <groupId>org.mybatis.spring.bootgroupId>
            <artifactId>mybatis-spring-boot-starterartifactId>
            <version>1.3.2version>
        dependency>
        <dependency>
            <groupId>com.alibabagroupId>
            <artifactId>druid-spring-boot-starterartifactId>
            <version>1.1.10version>
        dependency>
        <dependency>
            <groupId>mysqlgroupId>
            <artifactId>mysql-connector-javaartifactId>
            <scope>runtimescope>
        dependency>

配置数据库:

spring:
  datasource:
    boot:
      type: com.alibaba.druid.pool.DruidDataSource
      url: jdbc:mysql://localhost:3306/boot?useUnicode=true&characterEncoding=utf-8&serverTimezone=Asia/Shanghai
      username: root
      password: 123456
    boot2:
      type: com.alibaba.druid.pool.DruidDataSource
      url: jdbc:mysql://localhost:3306/boot2?useUnicode=true&characterEncoding=utf-8&serverTimezone=Asia/Shanghai
      username: root
      password: 123456

配置数据源:

创建DataSourceConfig配置数据源，根据application.yml中的配置生成两个数据源

@Configuration
public class DataSourceConfig {
 
    @Primary
    @Bean
    @ConfigurationProperties("spring.datasource.boot")
    DataSource dsOne() {
        return DruidDataSourceBuilder.create().build();
    }
 
    @Bean
    @ConfigurationProperties("spring.datasource.boot2")
    DataSource dsTwo() {
        return DruidDataSourceBuilder.create().build();
    }
 
}

创建MyBatis配置:

@Configuration
@MapperScan(value = "com.xc.xcspringboot.mapper", sqlSessionFactoryRef = "sqlSessionFactoryBean1")
public class MyBatisConfigOne {

    @Autowired
    @Qualifier("dsOne")
    DataSource dsOne;

    @Bean
    SqlSessionFactory sqlSessionFactoryBean1() throws Exception {
        SqlSessionFactoryBean factoryBean = new SqlSessionFactoryBean();
        factoryBean.setDataSource(dsOne);
        factoryBean.setMapperLocations(new PathMatchingResourcePatternResolver().getResources("classpath:mapper/**/*.xml"));
        return factoryBean.getObject();
    }

    @Bean
    SqlSessionTemplate sqlSessionTemplate1() throws Exception {
        return new SqlSessionTemplate(sqlSessionFactoryBean1());
    }

}

@Configuration
@MapperScan(value = "com.xc.xcspringboot.mapper2", sqlSessionFactoryRef = "sqlSessionFactoryBean2")
public class MyBatisConfigTwo {

    @Autowired
    @Qualifier("dsTwo")
    DataSource dsTwo;

    @Bean
    SqlSessionFactory sqlSessionFactoryBean2() throws Exception {
        SqlSessionFactoryBean factoryBean = new SqlSessionFactoryBean();
        factoryBean.setDataSource(dsTwo);
        factoryBean.setMapperLocations(new PathMatchingResourcePatternResolver().getResources("classpath:mapper2/**/*.xml"));
        return factoryBean.getObject();
    }

    @Bean
    SqlSessionTemplate sqlSessionTemplate2() throws Exception {
        return new SqlSessionTemplate(sqlSessionFactoryBean2());
    }
}

创建Mapper:

public interface BookMapper {
    List getAllBooks();
}

public interface BookMapper2 {
    List getAllBooks();
}

<mapper namespace="com.xc.xcspringboot.mapper.BookMapper">
    <select id="getAllBooks" resultType="com.xc.xcspringboot.model.Book">
        select *
        from book;
    select>
mapper>

<mapper namespace="com.xc.xcspringboot.mapper2.BookMapper2">
    <select id="getAllBooks" resultType="com.xc.xcspringboot.model.Book">
        select *
        from book;
    select>
mapper>

创建Controller:

@RestController
public class BookController {
    @Autowired
    BookMapper bookMapper;
    @Autowired
    BookMapper2 bookMapper2;
    @GetMapping("/test1")
    public void test1() {
        List books1 = bookMapper.getAllBooks();
        List books2 = bookMapper2.getAllBooks();
        System.out.println("books1:"+books1);
        System.out.println("books2:"+books2);
    }
}

文章来源: Spring Boot+Vue全栈开发实战 5.4 多数据源