tk.mybatis use

This article reprinted from: https://www.cnblogs.com/zkm1992/p/10939730.html

The introduction of dependence

The version used depends SpringBoot version, because there are compatibility issues, version requires confirmation well in advance.

    <dependency>
        <groupId>tk.mybatis</groupId>
        <artifactId>mapper-spring-boot-starter</artifactId>
        <version>2.0.2</version>
    </dependency>
    <dependency>
        <groupId>tk.mybatis</groupId>
        <artifactId>mapper</artifactId>
        <version>4.0.4 </version>
    </dependency>

Increase mapper component scans the configuration

 

/**
 * @author zkm
 * @date 2019/5/19 18:29
 */
@Configuration
@tk.mybatis.spring.annotation.MapperScan("top.zhangsanwan.eat.repository")
@EnableTransactionManagement
public class DalConfig {
} 

Create a base layer interfaces dao

 

Note: The Base package repository interfaces must not be placed below, in other words, do not be above Mapper component configured to scan to scan!

Creating BaseRepository <T> interface inheritance in three tk.mybatis.mapper:

1. Mapper<T>
2. IdsMapper<T>
3. InsertListMapper<T>

Of course, if the database is used in mysql, you can inherit several interfaces as follows:

1. Mapper<T>
2. MysqlMapper<T>

public interface BaseMapper<T> extends Mapper<T>, MySqlMapper<T> {

}

public interface MySqlMapper<T> extends InsertListMapper<T>, InsertUseGeneratedKeysMapper<T> {
}

Create a query interface layer dao

Creating Dao query interface MenuRepository, inherited Base interface BaseRepository Dao layer, corresponding generic database table mapping class.

/**
 * @author zkm
 * @date 2019/5/19 18:24
 */
public interface MenuRepository extends BaseRepository<Menu> {
}

service call dao layer inquiry

 

/**
 * @author zkm
 * @date 2019/5/19 18:23
 */
@Service
public class MenuServiceImpl implements IMenuService {

    @Resource
    private MenuRepository menuRepository;

    @Override
    public List<MenuVO> getMenu(String date) {
        SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd");
        String today = StringUtils.isEmpty(date) ? format.format(new Date()) : date;
        Example example = new Example(Menu.class);
        example.createCriteria().andGreaterThanOrEqualTo("createAt", today + " 00:00:00")
                .andLessThanOrEqualTo("createAt", today + " 23:59:59");
        example.setOrderByClause("sort asc");
        List<Menu> menuList = menuRepository.selectByExample(example);
        List<MenuVO> menuVOList = Lists.newArrayList();
        menuList.forEach(menu -> {
            MenuVO menuVO = new MenuVO();
            BeanUtils.copyProperties(menu, menuVO);
            menuVOList.add(menuVO);
        });
        return menuVOList;
    }
}