BeetlSQL 3.12.2 发布，流行的 Java DAO 工具

@SqlResource("user") /*sql文件在user.md里*/
public interface UserMapper extends BaseMapper<UserEntity> {

    @Sql("select * from user where id = ?")
    UserEntity queryUserById(Integer id);

    @Sql("update user set name=? where id = ?")
    @Update
    int updateName(String name,Integer id);

    @Template("select * from user where id = #{id}")
    UserEntity getUserById(Integer id);

    @SpringData/*Spring Data风格*/
    List<UserEntity> queryByNameOrderById(String name);

    /**
 * 可以定义一个default接口
 * @return
 */
     default  List<DepartmentEntity> findAllDepartment(){
        Map paras = new HashMap();
        paras.put("exlcudeId",1);
        List<DepartmentEntity> list = getSQLManager().execute("select * from department where id != #{exlcudeId}",DepartmentEntity.class,paras);
        return list;
    }


    /**
 * 调用sql文件user.md#select,方法名即markdown片段名字
 * @param name
 * @return
 */
     List<UserEntity> select(String name);


    /**
 * 翻页查询,调用user.md#pageQuery
 * @param deptId
 * @param pageRequest
 * @return
 */
    PageResult<UserEntity>  pageQuery(Integer deptId, PageRequest pageRequest);
	
    @SqlProvider(provider= S01MapperSelectSample.SelectUserProvider.class)
    List<UserEntity> queryUserByCondition(String name);

    @SqlTemplateProvider(provider= S01MapperSelectSample.SelectUs
    List<UserEntity> queryUserByTemplateCondition(String name);

    @Matcher /*自己定义个Matcher注解也很容易*/
    List<UserEntity> query(Condition condition,String name);
}

你看到的这些用在Mapper上注解都是可以自定义，自己扩展的

例子8 使用Fetch 注解

可以在查询后根据Fetch注解再次获取相关对象，实际上@FetchOne和 @FetchMany是自定义的，用户可自行扩展

    @Data
    @Table(name="user")
    @Fetch
    public static class UserData {
        @Auto
        private Integer id;
        private String name;
        private Integer departmentId;
        @FetchOne("departmentId")
        private DepartmentData dept;
    }

    /**
 * 部门数据使用"b" sqlmanager
 */
    @Data
    @Table(name="department")
    @Fetch
    public static class DepartmentData {
        @Auto
        private Integer id;
        private String name;
        @FetchMany("departmentId")
        private List<UserData> users;
    }