如何同时兼任mybaits和mybaits

-plus

要同时使用MyBatis和MyBatis-Plus，需要进行以下步骤：

1. 在项目中引入MyBatis和MyBatis-Plus的依赖（可以使用Maven或Gradle进行依赖管理）。

2. 配置MyBatis的SqlSessionFactory和MapperScannerConfigurer。

@Configuration
public class MyBatisConfig {

    @Bean
    @ConfigurationProperties(prefix = "spring.datasource")
    public DataSource dataSource() {
        return new DruidDataSource();
    }

    @Bean
    public SqlSessionFactoryBean sqlSessionFactory() throws Exception {
        SqlSessionFactoryBean sessionFactory = new SqlSessionFactoryBean();
        sessionFactory.setDataSource(dataSource());
        sessionFactory.setTypeAliasesPackage("com.example.model");
        return sessionFactory;
    }

    @Bean
    public MapperScannerConfigurer mapperScannerConfigurer() {
        MapperScannerConfigurer configurer = new MapperScannerConfigurer();
        configurer.setBasePackage("com.example.mapper");
        return configurer;
    }
}

3. 配置MyBatis-Plus的MapperScannerConfigurer和PaginationInterceptor。

@Configuration
public class MyBatisPlusConfig {

    @Bean
    public MapperScannerConfigurer mapperScannerConfigurer() {
        MapperScannerConfigurer configurer = new MapperScannerConfigurer();
        configurer.setBasePackage("com.example.mapper.plus");
        return configurer;
    }

    @Bean
    public PaginationInterceptor paginationInterceptor() {
        return new PaginationInterceptor();
    }
}

4. 在Mapper接口中使用MyBatis和MyBatis-Plus的注解。

@Mapper
public interface UserMapper {

    @Select("SELECT * FROM user WHERE id = #{id}")
    User findById(@Param("id") Long id);

    @Select("SELECT * FROM user")
    List<User> findAll();

    @Insert("INSERT INTO user (name, age) VALUES (#{name}, #{age})")
    @Options(useGeneratedKeys = true, keyProperty = "id")
    int insert(User user);

    @Update("UPDATE user SET name = #{name}, age = #{age} WHERE id = #{id}")
    int update(User user);

    @Delete("DELETE FROM user WHERE id = #{id}")
    int deleteById(@Param("id") Long id);

    @Select("SELECT * FROM user WHERE name = #{name}")
    User selectByName(@Param("name") String name);

    List<User> selectPage(Page<User> page, @Param("name") String name);
}

5. 在Service层中使用MyBatis和MyBatis-Plus的Mapper接口。

@Service
public class UserService {

    @Autowired
    private UserMapper userMapper;

    @Autowired
    private UserMapperPlus userMapperPlus;

    public User findById(Long id) {
        return userMapper.findById(id);
    }

    public List<User> findAll() {
        return userMapper.findAll();
    }

    public int insert(User user) {
        return userMapper.insert(user);
    }

    public int update(User user) {
        return userMapper.update(user);
    }

    public int deleteById(Long id) {
        return userMapper.deleteById(id);
    }

    public User selectByName(String name) {
        return userMapper.selectByName(name);
    }

    public List<User> selectPage(Page<User> page, String name) {
        return userMapperPlus.selectPage(page, name);
    }
}

6. 在Controller层中调用Service层的方法。

@RestController
public class UserController {

    @Autowired
    private UserService userService;

    @GetMapping("/user/{id}")
    public User findById(@PathVariable("id") Long id) {
        return userService.findById(id);
    }

    @GetMapping("/user")
    public List<User> findAll() {
        return userService.findAll();
    }

    @PostMapping("/user")
    public int insert(@RequestBody User user) {
        return userService.insert(user);
    }

    @PutMapping("/user")
    public int update(@RequestBody User user) {
        return userService.update(user);
    }

    @DeleteMapping("/user/{id}")
    public int deleteById(@PathVariable("id") Long id) {
        return userService.deleteById(id);
    }

    @GetMapping("/user/name/{name}")
    public User selectByName(@PathVariable("name") String name) {
        return userService.selectByName(name);
    }

    @GetMapping("/user/page")
    public List<User> selectPage(@RequestParam(value = "page", defaultValue = "1") int pageNum,
                                 @RequestParam(value = "size", defaultValue = "10") int pageSize,
                                 @RequestParam(value = "name", required = false) String name) {
        Page<User> page = new Page<>(pageNum, pageSize);
        return userService.selectPage(page, name);
    }
}

这样就可以同时使用MyBatis和MyBatis-Plus了。在需要使用分页等高级功能时，可以使用MyBatis-Plus的Mapper接口和方法。在不需要高级功能时，可以使用MyBatis的注解和Mapper接口。