初始化v1

target/classes/mapper/UserSimilarityMapper.xml

@@ -0,0 +1,31 @@
+<?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.nlshop.mapper.UserSimilarityMapper">
+    <resultMap id="BaseResultMap" type="com.nlshop.entity.UserSimilarity">
+        <result column="user1_id" property="user1Id"/>
+        <result column="user2_id" property="user2Id"/>
+        <result column="similarity_score" property="similarityScore"/>
+        <result column="update_time" property="updateTime"/>
+    </resultMap>
+
+    <insert id="insertOrUpdate" parameterType="com.nlshop.entity.UserSimilarity">
+        INSERT INTO user_similarity (user1_id, user2_id, similarity_score)
+        VALUES (#{user1Id}, #{user2Id}, #{similarityScore})
+        ON DUPLICATE KEY UPDATE
+        similarity_score = #{similarityScore}, update_time = NOW()
+    </insert>
+
+    <select id="selectByUserIds" resultMap="BaseResultMap">
+        SELECT * FROM user_similarity
+        WHERE (user1_id = #{user1Id} AND user2_id = #{user2Id})
+           OR (user1_id = #{user2Id} AND user2_id = #{user1Id})
+        LIMIT 1
+    </select>
+
+    <select id="selectSimilarUsers" resultMap="BaseResultMap">
+        SELECT * FROM user_similarity
+        WHERE user1_id = #{userId} OR user2_id = #{userId}
+        ORDER BY similarity_score DESC
+        LIMIT #{limit}
+    </select>
+</mapper>