SpringBoot整合mybatis多数据源

废话不多说先上结果

对应数据库

首先导入所需的mybatis、mysql和lombok依赖

        <dependency>
            <groupId>org.mybatis.spring.boot</groupId>
            <artifactId>mybatis-spring-boot-starter</artifactId>
            <version>2.2.2</version>
        </dependency>

        <dependency>
            <groupId>com.mysql</groupId>
            <artifactId>mysql-connector-j</artifactId>
            <scope>runtime</scope>
        </dependency>
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <optional>true</optional>
        </dependency>

配置文件（两个数据库不一样）

配置数据库连接类

@Configuration
//basePackages:接口文件的包路径
@MapperScan(basePackages = "com.example.mapper", sqlSessionFactoryRef = "PrimarySqlSessionFactory")
public class PrimaryDataSourceConfig {

    @Bean(name = "PrimaryDataSource")
    // 表示这个数据源是默认数据源
    @Primary//这个一定要加，如果两个数据源都没有@Primary会报错
    @ConfigurationProperties(prefix = "spring.datasource.primary")//配置文件中的前缀
    public DataSource getPrimaryDateSource() {
        return DataSourceBuilder.create().build();
    }

    @Bean(name = "PrimarySqlSessionFactory")
    @Primary
    public SqlSessionFactory primarySqlSessionFactory(@Qualifier("PrimaryDataSource") DataSource datasource)
            throws Exception {
        SqlSessionFactoryBean bean = new SqlSessionFactoryBean();
        bean.setDataSource(datasource);
        bean.setMapperLocations(
                new PathMatchingResourcePatternResolver().getResources("classpath*:mapping/one/*.xml"));
        return bean.getObject();// 设置mybatis的xml所在位置
    }

    @Bean("PrimarySqlSessionTemplate")
    // 表示这个数据源是默认数据源
    @Primary
    public SqlSessionTemplate primarySqlSessionTemplate(
            @Qualifier("PrimarySqlSessionFactory") SqlSessionFactory sessionfactory) {
        return new SqlSessionTemplate(sessionfactory);
    }

}

@Configuration
@MapperScan(basePackages = "com.example.mapper2", sqlSessionFactoryRef = "SecondarySqlSessionFactory")
public class SecondaryDataSourceConfig {

    @Bean(name = "SecondaryDataSource")
    @ConfigurationProperties(prefix = "spring.datasource.secondary")
    public DataSource getSecondaryDataSource() {
        return DataSourceBuilder.create().build();
    }

    @Bean(name = "SecondarySqlSessionFactory")
    public SqlSessionFactory secondarySqlSessionFactory(@Qualifier("SecondaryDataSource") DataSource datasource)
            throws Exception {
        SqlSessionFactoryBean bean = new SqlSessionFactoryBean();
        bean.setDataSource(datasource);
        bean.setMapperLocations(
                new PathMatchingResourcePatternResolver().getResources("classpath*:mapping/two/*.xml"));
        return bean.getObject();// 设置mybatis的xml所在位置
    }

    @Bean("SecondarySqlSessionTemplate")
    public SqlSessionTemplate secondarySqlSessionTemplate(
            @Qualifier("SecondarySqlSessionFactory") SqlSessionFactory sessionfactory) {
        return new SqlSessionTemplate(sessionfactory);
    }
}

实体类（这里写的非常简单）

mapper文件（主要不同的数据库，mapper也要由区分，例如上文配置数据库连接类中俩个包名并不相同）

对应的mapper.xml文件

Service层

ServiceImpl类

@Service
public class UserServiceImpl implements UserService {
    @Autowired
    private PrimaryUserMapper primaryUserMapper;
    @Autowired
    private SecondaryUserMapper secondaryUserMapper;



    @Override
    public List<User> findAll1() {
        return primaryUserMapper.findAll();
    }

    @Override
    public List<User> findAll2() {
        return secondaryUserMapper.findAll();
    }
}

最后测试是否连接成功