7

src/main/resources/mapper/YishengDao.xml

@@ -1,8 +1,8 @@
 <?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.dao.YishengDao">
-
     <!-- 通用查询结果列 -->
+    <!-- 定义了一个 SQL 片段，包含了从数据库表中查询的列，将这些列别名为实体类中的属性名，方便结果映射 -->
     <sql id="Base_Column_List">
         a.id as id
         ,a.yisheng_uuid_number as yishengUuidNumber
@@ -20,64 +20,77 @@
         ,a.yisheng_content as yishengContent
         ,a.create_time as createTime
     </sql>
-    <select id="selectListView" parameterType="map" resultType="com.entity.view.YishengView" >
+    <!-- 定义一个查询方法，id 为 "selectListView"，参数类型为 Map，返回类型为 com.entity.view.YishengView -->
+    <select id="selectListView" parameterType="map" resultType="com.entity.view.YishengView">
         SELECT
+        <!-- 引入上面定义的通用查询结果列 SQL 片段 -->
         <include refid="Base_Column_List" />
 
---         级联表的字段
-
+        --         级联表的字段
         FROM yisheng  a
-
+        <!-- 条件查询部分 -->
         <where>
+            <!-- 如果参数中存在 "ids"，并且其值不为空，构建 in 条件 -->
             <if test="params.ids != null">
                 and a.id in
                 <foreach item="item" index="index" collection="params.ids" open="(" separator="," close=")">
                     #{item}
                 </foreach>
             </if>
+            <!-- 如果参数中 "yishengUuidNumber" 不为空字符串、不为 null 且不等于 "null" 字符串，构建模糊查询条件 -->
             <if test=" params.yishengUuidNumber != '' and params.yishengUuidNumber != null and params.yishengUuidNumber != 'null' ">
                 and a.yisheng_uuid_number like CONCAT('%',#{params.yishengUuidNumber},'%')
             </if>
+            <!-- 如果参数中 "username" 不为空字符串、不为 null 且不等于 "null" 字符串，构建模糊查询条件 -->
             <if test=" params.username != '' and params.username != null and params.username != 'null' ">
                 and a.username like CONCAT('%',#{params.username},'%')
             </if>
+            <!-- 如果参数中 "password" 不为空字符串、不为 null 且不等于 "null" 字符串，构建模糊查询条件 -->
             <if test=" params.password != '' and params.password != null and params.password != 'null' ">
                 and a.password like CONCAT('%',#{params.password},'%')
             </if>
+            <!-- 如果参数中 "yishengName" 不为空字符串、不为 null 且不等于 "null" 字符串，构建模糊查询条件 -->
             <if test=" params.yishengName != '' and params.yishengName != null and params.yishengName != 'null' ">
                 and a.yisheng_name like CONCAT('%',#{params.yishengName},'%')
             </if>
+            <!-- 如果参数中 "yishengTypes" 不为空且不为空字符串，构建等于条件 -->
             <if test="params.yishengTypes != null and params.yishengTypes != ''">
                 and a.yisheng_types = #{params.yishengTypes}
             </if>
+            <!-- 如果参数中 "zhiweiTypes" 不为空且不为空字符串，构建等于条件 -->
             <if test="params.zhiweiTypes != null and params.zhiweiTypes != ''">
                 and a.zhiwei_types = #{params.zhiweiTypes}
             </if>
+            <!-- 如果参数中 "yishengZhichneg" 不为空字符串、不为 null 且不等于 "null" 字符串，构建模糊查询条件 -->
             <if test=" params.yishengZhichneg != '' and params.yishengZhichneg != null and params.yishengZhichneg != 'null' ">
                 and a.yisheng_zhichneg like CONCAT('%',#{params.yishengZhichneg},'%')
             </if>
+            <!-- 如果参数中 "yishengPhone" 不为空字符串、不为 null 且不等于 "null" 字符串，构建模糊查询条件 -->
             <if test=" params.yishengPhone != '' and params.yishengPhone != null and params.yishengPhone != 'null' ">
                 and a.yisheng_phone like CONCAT('%',#{params.yishengPhone},'%')
             </if>
+            <!-- 如果参数中 "yishengGuahao" 不为空字符串、不为 null 且不等于 "null" 字符串，构建模糊查询条件 -->
             <if test=" params.yishengGuahao != '' and params.yishengGuahao != null and params.yishengGuahao != 'null' ">
                 and a.yisheng_guahao like CONCAT('%',#{params.yishengGuahao},'%')
             </if>
+            <!-- 如果参数中 "yishengEmail" 不为空字符串、不为 null 且不等于 "null" 字符串，构建模糊查询条件 -->
             <if test=" params.yishengEmail != '' and params.yishengEmail != null and params.yishengEmail != 'null' ">
                 and a.yisheng_email like CONCAT('%',#{params.yishengEmail},'%')
             </if>
+            <!-- 如果参数中 "yishengNewMoneyStart" 不为空，构建大于等于条件，使用 CDATA 防止特殊字符转义 -->
             <if test="params.yishengNewMoneyStart != null ">
                 <![CDATA[  and a.yisheng_new_money >= #{params.yishengNewMoneyStart}   ]]>
             </if>
+            <!-- 如果参数中 "yishengNewMoneyEnd" 不为空，构建小于等于条件，使用 CDATA 防止特殊字符转义 -->
             <if test="params.yishengNewMoneyEnd != null ">
                 <![CDATA[  and a.yisheng_new_money <= #{params.yishengNewMoneyEnd}   ]]>
             </if>
+            <!-- 如果参数中 "yishengContent" 不为空字符串、不为 null 且不等于 "null" 字符串，构建模糊查询条件 -->
             <if test=" params.yishengContent != '' and params.yishengContent != null and params.yishengContent != 'null' ">
                 and a.yisheng_content like CONCAT('%',#{params.yishengContent},'%')
             </if>
-
         </where>
-
+        <!-- 根据参数中的 "orderBy" 字段进行降序排序 -->
         order by a.${params.orderBy} desc
     </select>
-
 </mapper>