🔄Update: 自定义SQL批量更新博客点赞数

src/main/java/cn/hezhaohui/thumb/mapper/BlogMapper.java

@@ -2,6 +2,9 @@ package cn.hezhaohui.thumb.mapper;
 
 import cn.hezhaohui.thumb.model.entity.Blog;
 import com.baomidou.mybatisplus.core.mapper.BaseMapper;
+import org.apache.ibatis.annotations.Param;
+
+import java.util.Map;
 
 /**
 * @author 23117
@@ -10,7 +13,7 @@ import com.baomidou.mybatisplus.core.mapper.BaseMapper;
 * @Entity cn.hezhaohui.thumb.model.entity.Blog
 */
 public interface BlogMapper extends BaseMapper<Blog> {
-
+    void batchUpdateThumbCount(@Param("countMap") Map<Long, Long> countMap);
 }
 
 

src/main/resources/mapper/BlogMapper.xml

@@ -19,4 +19,17 @@
         id,userId,title,coverImg,content,thumbCount,
         createTime,updateTime
     </sql>
+    <update id="batchUpdateThumbCount">
+        UPDATE blog
+        SET thumbCount = thumbCount + CASE id
+        <foreach collection="countMap.entrySet()" item="value" index="key">
+            WHEN #{key} THEN #{value}
+        </foreach>
+        END
+        WHERE id IN
+        <foreach collection="countMap.keySet()" item="id" open="(" separator="," close=")">
+            #{id}
+        </foreach>
+    </update>
+
 </mapper>