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src/main/resources/mybatis/CommentDao.xml

@@ -32,7 +32,7 @@
       root_comment_id, like_count, comment_time, 
       comment_status, update_time, rating
       )
-    values (#{urlId,jdbcType=INTEGER}, #{userId,jdbcType=INTEGER}, #{content,jdbcType=VARCHAR}, 
+    values (#{urlId,jdbcType=INTEGER}, #{userId,jdbcType=INTEGER}, #{content,jdbcType=VARCHAR},
       #{rootCommentId,jdbcType=INTEGER}, #{likeCount,jdbcType=BIGINT}, #{commentTime,jdbcType=TIMESTAMP}, 
       #{commentStatus,jdbcType=TINYINT}, #{updateTime,jdbcType=TIMESTAMP}, #{rating,jdbcType=INTEGER}
       )
@@ -144,4 +144,12 @@
       rating = #{rating,jdbcType=INTEGER}
     where id = #{id,jdbcType=INTEGER}
   </update>
+
+  <select id="selectByRootId" parameterType="java.lang.Integer" resultMap="BaseResultMap">
+    select
+        id
+    from ln_comment
+    where root_comment_id = #{rootCommentId,jdbcType=INTEGER}
+  </select>
+
 </mapper>