diff --git a/src/main/resources/mapper/PostMapper.xml b/src/main/resources/mapper/PostMapper.xml
new file mode 100644
index 0000000..bc4debe
--- /dev/null
+++ b/src/main/resources/mapper/PostMapper.xml
@@ -0,0 +1,9 @@
+<?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">
+
+<mapper namespace="com.example.g8backend.mapper.PostMapper">
+    <select id="getPostsByUserId" resultType="com.example.g8backend.entity.Post">
+        SELECT * FROM posts WHERE user_id = #{userId}
+    </select>
+</mapper>
\ No newline at end of file