SpringBoot和mybatis的高级应用

╰半橙微兮° 2022-06-02 11:37 135阅读 0赞

package com.moxi.service;
    
    import java.util.List;
    
    import org.apache.ibatis.annotations.Insert;
    import org.apache.ibatis.annotations.Mapper;
    import org.apache.ibatis.annotations.Select;
    import org.apache.ibatis.annotations.Update;
    
    import com.moxi.model.News;
    import com.moxi.util.Constant;
       
    @Mapper
    public interface NewsService {
       
       @Select("SELECT * FROM MOXI.NEWS WHERE ID = #{id};")
       News findById(News news);
       
       @Select({
          "<script>",
          "SELECT N.*,C.NAME AS CATEGORYNAME,C.IMAGE AS CATEGORYIMAGE FROM MOXI.NEWS N ",
          "LEFT JOIN MOXI.NEWS_CATEGORY C ON N.CATEGORY = C.ID ",
          "WHERE N.STATE = 1 ",
             "<when test='title!=null'>",
                "AND N.TITLE LIKE CONCAT('%',#{title},'%')",
             "</when>",
             "<when test='category!=0'>",
                "AND category = #{category}",
             "</when>",
             "<when test='commendState!=0'>",
                "AND commendState = #{commendState}",
             "</when>",
             "<when test='orderBy==\""+Constant.OrderByAddDateAsc+"\"'>",
                "order by "+Constant.OrderByAddDateAsc+",addDate desc",
             "</when>",
             "<when test='orderBy==\""+Constant.OrderByAddDateDesc+"\"'>",
                "order by "+Constant.OrderByAddDateDesc,
             "</when>",
             "<when test='orderBy==\""+Constant.OrderByBrowsesDesc+"\"'>",
                "order by "+Constant.OrderByBrowsesDesc+",addDate desc",
             "</when>",
             "<when test='orderBy==\""+Constant.OrderByCommentsDesc+"\"'>",
                "order by "+Constant.OrderByCommentsDesc+",addDate desc",
             "</when>",
             "<when test='orderBy==\""+Constant.OrderByLikesDesc+"\"'>",
                "order by "+Constant.OrderByLikesDesc+",addDate desc",
             "</when>",
             "<when test='orderBy==\""+Constant.OrderByScoreDesc+"\"'>",
                "order by "+Constant.OrderByScoreDesc+",addDate desc",
             "</when>",
             "limit #{start},#{end}",
          "</script>" })
       List<News> list(News news);
       
       @Select({
          "<script>",
          "SELECT COUNT(*) FROM MOXI.NEWS N ",
          "LEFT JOIN MOXI.NEWS_CATEGORY C ON N.CATEGORY = C.ID ",
          "WHERE N.STATE = 1 ",
             "<when test='title!=null'>",
                "AND N.TITLE LIKE CONCAT('%',#{title},'%')",
             "</when>",
             "<when test='category!=0'>",
                "AND category = #{category}",
             "</when>",
             "<when test='commendState!=0'>",
                "AND commendState = #{commendState}",
             "</when>",
          "</script>" })
       int count(News news);
       
       @Insert("INSERT INTO `moxi`.`news` (`id`,`title`,`description`,`category`,`image`,`content`,`addDate`,`updateDate`,`commendState`,`state`,`browses`,`likes`,`comments`,`score`) VALUES (null,#{title},#{description},#{category},#{image},#{content},now(),now(),1,1,0,0,0,0);")
       int insert(News news);
    
       @Update("UPDATE `moxi`.`news` SET `title` = #{title}, `description` = #{description}, `category` = #{category}, `image` = #{image}, `content` = #{content}, `updateDate` = now() WHERE `id` = #{id};")
       int update(News news);
       
       @Update("UPDATE `moxi`.`news` SET `state` = #{state}, `commendState` = #{commendState}, `browses` = #{browses}, `likes` = #{likes}, `comments` = #{comments}, `score` = #{score} WHERE `id` = #{id};")
       int updateState(News news);
       
    }
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