初始化dev

src/main/resources/mapper/QuestionMapper.xml

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+<?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.qingqiu.interview.mapper.QuestionMapper">
+
+    <select id="selectByCategory" resultType="com.qingqiu.interview.entity.Question">
+        SELECT *
+        FROM question 
+        WHERE category = #{category} AND deleted = 0
+        ORDER BY created_time DESC
+    </select>
+
+    <select id="selectByCategories" resultType="com.qingqiu.interview.entity.Question">
+        SELECT *
+        FROM question 
+        WHERE category IN
+        <foreach collection="categories" item="category" open="(" separator="," close=")">
+            #{category}
+        </foreach>
+        AND deleted = 0
+        ORDER BY created_time DESC
+    </select>
+
+    <select id="selectRandomByCategories" resultType="com.qingqiu.interview.entity.Question">
+        SELECT *
+        FROM question 
+        WHERE category IN
+        <foreach collection="categories" item="category" open="(" separator="," close=")">
+            #{category}
+        </foreach>
+        AND deleted = 0
+        ORDER BY RAND()
+        LIMIT #{limit}
+    </select>
+
+    <select id="selectByContent" resultType="com.qingqiu.interview.entity.Question">
+        SELECT *
+        FROM question
+        WHERE content = #{content} AND deleted = 0
+        LIMIT 1
+    </select>
+
+    <select id="countByCategory" resultType="com.qingqiu.interview.dto.DashboardStatsResponse$CategoryStat">
+        SELECT category as name, COUNT(*) as value
+        FROM question
+        WHERE deleted = 0
+        GROUP BY category
+        ORDER BY value DESC
+    </select>
+
+</mapper>