学习文章来自：

配置文件

pom包就不贴了比较简单该依赖的就依赖，主要是数据库这边的配置：

mybatis.config-locations=classpath:mybatis/mybatis-config.xmlspring.datasource.test1.driverClassName = com.mysql.jdbc.Driverspring.datasource.test1.url = jdbc:mysql://localhost:3306/test1?useUnicode=true&characterEncoding=utf-8spring.datasource.test1.username = rootspring.datasource.test1.password = rootspring.datasource.test2.driverClassName = com.mysql.jdbc.Driverspring.datasource.test2.url = jdbc:mysql://localhost:3306/test2?useUnicode=true&characterEncoding=utf-8spring.datasource.test2.username = rootspring.datasource.test2.password = root

 

一个test1库和一个test2库，其中test1位主库，在使用的过程中必须指定主库，不然会报错。

数据源配置

@Configuration@MapperScan(basePackages = "com.neo.mapper.test1", sqlSessionTemplateRef  = "test1SqlSessionTemplate")public class DataSource1Config {    @Bean(name = "test1DataSource")    @ConfigurationProperties(prefix = "spring.datasource.test1")    @Primary    public DataSource testDataSource() {        return DataSourceBuilder.create().build();    }    @Bean(name = "test1SqlSessionFactory")    @Primary    public SqlSessionFactory testSqlSessionFactory(@Qualifier("test1DataSource") DataSource dataSource) throws Exception {        SqlSessionFactoryBean bean = new SqlSessionFactoryBean();        bean.setDataSource(dataSource);        bean.setMapperLocations(new PathMatchingResourcePatternResolver().getResources("classpath:mybatis/mapper/test1/*.xml"));        return bean.getObject();    }    @Bean(name = "test1TransactionManager")    @Primary    public DataSourceTransactionManager testTransactionManager(@Qualifier("test1DataSource") DataSource dataSource) {        return new DataSourceTransactionManager(dataSource);    }    @Bean(name = "test1SqlSessionTemplate")    @Primary    public SqlSessionTemplate testSqlSessionTemplate(@Qualifier("test1SqlSessionFactory") SqlSessionFactory sqlSessionFactory) throws Exception {        return new SqlSessionTemplate(sqlSessionFactory);    }}

 

最关键的地方就是这块了，一层一层注入,首先创建DataSource，然后创建SqlSessionFactory再创建事务，最后包装到SqlSessionTemplate中。其中需要指定分库的mapper文件地址，以及分库dao层代码

@MapperScan(basePackages = "com.neo.mapper.test1", sqlSessionTemplateRef  = "test1SqlSessionTemplate")

这块的注解就是指明了扫描dao层，并且给dao层注入指定的SqlSessionTemplate。所有@Bean都需要按照命名指定正确。

dao层和xml层

dao层和xml需要按照库来分在不同的目录，比如：test1库dao层在com.neo.mapper.test1包下，test2库在com.neo.mapper.test1

public interface User1Mapper {        List
     
       getAll();        UserEntity getOne(Long id);    void insert(UserEntity user);    void update(UserEntity user);    void delete(Long id);}
     

 

xml层

     
         
              
               
               
               
               
           
              
      
               id, userName, passWord, user_sex, nick_name    
          
             SELECT               FROM users        
              SELECT               FROM users       WHERE id = #{id}        
      
              INSERT INTO                users               (userName,passWord,user_sex)            VALUES               (#{userName}, #{passWord}, #{userSex})    
              
      
              UPDATE                users        SET            
       
        userName = #{userName},
                  
       
        passWord = #{passWord},
                  nick_name = #{nickName}       WHERE                id = #{id}    
              
      
              DELETE FROM                users        WHERE                 id =#{id}    
      
     测试测试可以使用SpringBootTest,也可以放到Controller中，这里只贴Controller层的使用@RestControllerpublic class UserController {    @Autowired    private User1Mapper user1Mapper;    @Autowired    private User2Mapper user2Mapper;        @RequestMapping("/getUsers")    public List
     
       getUsers() {        List
      
        users=user1Mapper.getAll();        return users;    }        @RequestMapping("/getUser")    public UserEntity getUser(Long id) {        UserEntity user=user2Mapper.getOne(id);        return user;    }        @RequestMapping("/add")    public void save(UserEntity user) {        user2Mapper.insert(user);    }        @RequestMapping(value="update")    public void update(UserEntity user) {        user2Mapper.update(user);    }        @RequestMapping(value="/delete/{id}")    public void delete(@PathVariable("id") Long id) {        user1Mapper.delete(id);    }    }
      
     

学习文章来自：