SpringBoot整合mybatis多数据源-编程知识

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")@Primarypublic 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@Primarypublic 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 {@Autowiredprivate PrimaryUserMapper primaryUserMapper;@Autowiredprivate SecondaryUserMapper secondaryUserMapper;@Overridepublic List<User> findAll1() {return primaryUserMapper.findAll();}@Overridepublic List<User> findAll2() {return secondaryUserMapper.findAll();}
}

最后测试是否连接成功