diff --git a/src/main/resources/mapper/PostMapper.xml b/src/main/resources/mapper/PostMapper.xml
index bc4debe..c1dbda7 100644
--- a/src/main/resources/mapper/PostMapper.xml
+++ b/src/main/resources/mapper/PostMapper.xml
@@ -1,3 +1,4 @@
+.xml
 <?xml version="1.0" encoding="UTF-8"?>
 <!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
         "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
@@ -6,4 +7,18 @@
     <select id="getPostsByUserId" resultType="com.example.g8backend.entity.Post">
         SELECT * FROM posts WHERE user_id = #{userId}
     </select>
+
+    <select id="getPostLikeCount" resultType="java.lang.Long">
+        SELECT COUNT(*) FROM post_likes WHERE post_id = #{postId}
+    </select>
+
+    <insert id="likePost">
+        INSERT INTO post_likes (user_id, post_id)
+        VALUES (#{userId}, #{postId})
+    </insert>
+
+    <delete id="unlikePost">
+        DELETE FROM post_likes 
+        WHERE user_id = #{userId} AND post_id = #{postId}
+    </delete>
 </mapper>
\ No newline at end of file