feat: add MyBatis CRUD and database integration

src/main/resources/mapper/UserMapper.xml

@@ -0,0 +1,52 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
+    "https://mybatis.org/dtd/mybatis-3-mapper.dtd">
+<mapper namespace="com.hongzhen.hera.user.UserMapper">
+
+  <sql id="BaseColumnList">
+    id, open_id, union_id, phone, avatar_url, nickname, gender, birthday, birth_hour,
+    province, city, district, points, pinned_daily_card_id, profile_edit_count, created_at, updated_at
+  </sql>
+
+  <select id="findById" resultType="com.hongzhen.hera.user.User">
+    SELECT <include refid="BaseColumnList"/>
+    FROM hera_user
+    WHERE id = #{id}
+  </select>
+
+  <select id="findByOpenId" resultType="com.hongzhen.hera.user.User">
+    SELECT <include refid="BaseColumnList"/>
+    FROM hera_user
+    WHERE open_id = #{openId}
+  </select>
+
+  <insert id="insert" useGeneratedKeys="true" keyProperty="id">
+    INSERT INTO hera_user (
+      open_id, union_id, phone, avatar_url, nickname, gender, birthday, birth_hour,
+      province, city, district, points, pinned_daily_card_id, profile_edit_count, created_at, updated_at
+    ) VALUES (
+      #{openId}, #{unionId}, #{phone}, #{avatarUrl}, #{nickname}, #{gender}, #{birthday}, #{birthHour},
+      #{province}, #{city}, #{district}, #{points}, #{pinnedDailyCardId}, #{profileEditCount},
+      #{createdAt}, #{updatedAt}
+    )
+  </insert>
+
+  <update id="update">
+    UPDATE hera_user
+    SET union_id = #{unionId},
+        phone = #{phone},
+        avatar_url = #{avatarUrl},
+        nickname = #{nickname},
+        gender = #{gender},
+        birthday = #{birthday},
+        birth_hour = #{birthHour},
+        province = #{province},
+        city = #{city},
+        district = #{district},
+        points = #{points},
+        pinned_daily_card_id = #{pinnedDailyCardId},
+        profile_edit_count = #{profileEditCount},
+        updated_at = #{updatedAt}
+    WHERE id = #{id}
+  </update>
+</mapper>