知识科普查询

backend/src/main/java/com/nav/dao/KnowledgeDao.java

+package com.nav.dao;
+
+import com.nav.pojo.Knowledge;
+import lombok.AllArgsConstructor;
+import lombok.Data;
+import lombok.NoArgsConstructor;
+import org.apache.ibatis.annotations.Mapper;
+
+import java.util.List;
+
+/**
+ * @ClassName KnowledgeDao
+ * @Description KnowledgeDao
+ * @Date 2022/5/6 11:39
+ * @Author hck
+ */
+@Mapper
+public interface KnowledgeDao {
+    /**
+     * 查找所有干货
+     * @return List<Knowledge>
+     */
+    public List<Knowledge> selectAllKnowledge();
+
+    /**
+     * 将科普用时间顺序排序
+     * @param id
+     * @return List<Knowledge>
+     */
+    public List<Knowledge> selectKnowledgeByDate(String id);
+
+    /**
+     * 将科普用浏览量排序
+     * @param id
+     * @return
+     */
+    public List<Knowledge> selectKnowledgeByViewCount(String id);
+}

backend/src/main/java/com/nav/pojo/Knowledge.java

+package com.nav.pojo;
+
+import lombok.AllArgsConstructor;
+import lombok.Data;
+import lombok.NoArgsConstructor;
+
+import java.util.Date;
+
+/**
+ * @ClassName Knowledge
+ * @Description Knowledge
+ * @Date 2022/5/6 11:36
+ * @Author hck
+ */
+@Data
+@AllArgsConstructor
+@NoArgsConstructor
+public class Knowledge {
+    private long id;
+    private String title;
+    private Date postDate;
+    private String source;
+    private String content;
+    private int kind;
+    private int viewCount;
+    private Date gmtCreate;
+    private Date gmtModified;
+}

backend/src/main/resources/mapper/KnowledgeMapper.xml

+<?xml version="1.0" encoding="UTF-8" ?>
+<!DOCTYPE mapper
+        PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
+        "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
+<mapper namespace="com.nav.dao.KnowledgeDao">
+    <select id="selectAllknowledge"  resultType="com.nav.pojo.Knowledge">
+        select *
+        from knowledge
+    </select>
+
+    <select id="selectknowledgeByDate"  resultType="com.nav.pojo.Knowledge">
+        select *
+        from knowledge
+        where kind = #{id}
+        order by postDate desc
+    </select>
+
+    <select id="selectknowledgeByDate"  resultType="com.nav.pojo.Knowledge">
+        select *
+        from knowledge
+        where kind = #{id}
+        order by viewCount desc
+    </select>
+
+</mapper>
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