From 96fe719298095e6791076e75599f4be07bb40278 Mon Sep 17 00:00:00 2001
From: pco4bax5y <2276598359@qq.com>
Date: Sat, 29 Apr 2023 23:09:57 +0800
Subject: [PATCH] =?UTF-8?q?=E6=B7=BB=E5=8A=A0ClassDao.xml?=
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---
 src/cn/edu/hactcm/dao/ClassDao.xml | 105 +++++++++++++++++++++++++++++
 1 file changed, 105 insertions(+)
 create mode 100644 src/cn/edu/hactcm/dao/ClassDao.xml

diff --git a/src/cn/edu/hactcm/dao/ClassDao.xml b/src/cn/edu/hactcm/dao/ClassDao.xml
new file mode 100644
index 0000000..e77c088
--- /dev/null
+++ b/src/cn/edu/hactcm/dao/ClassDao.xml
@@ -0,0 +1,105 @@
+<?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.itheima.dao.ClassDao" >
+
+    <!--分页查询-->
+    <select id="getClassList" parameterType="Class" resultType="Class">
+        select *from d_class
+        <where>
+            <if test="c_classname!=null and c_classname!='' ">
+                and  c_classname like  '%${c_classname}%'
+            </if>
+            <if test="c_counsellor!=null and c_counsellor!=''">
+                and  c_counsellor like  '%${c_counsellor}%'
+            </if>
+            <if test="c_classid!=null and c_classid!=0">
+                and  c_classid like  '%${c_classid}%'
+            </if>
+        </where>
+        ORDER BY  c_id asc
+        limit #{currentPage},#{pageSize}
+    </select>
+    <!--查询数据总数-->
+    <select id="totalCount"  resultType="Integer">
+        select count(c_id) from d_class
+        <where>
+            <if test="c_classname!=null and c_classname!='' ">
+                and  c_classname like  '%${c_classname}%'
+            </if>
+            <if test="c_counsellor!=null and c_counsellor!=''">
+                and  c_counsellor like  '%${c_counsellor}%'
+            </if>
+            <if test="c_classid!=null and c_classid!=0">
+                and  c_classid like  '%${c_classid}%'
+            </if>
+          </where>
+    </select>
+
+    <!--通过id删除班级信息-->
+    <delete id="deleteClass" parameterType="Integer" >
+        delete from d_class where c_id=#{c_id}
+    </delete>
+    <!--添加班级信息-->
+    <insert id="addClass" parameterType="Class" keyProperty="c_id" useGeneratedKeys="true">
+        insert into d_class (c_classid,c_classname,c_counsellor)
+        values(#{c_classid},#{c_classname},#{c_counsellor})
+    </insert>
+
+    <select id="findClassById"  parameterType="Integer" resultType="Class" >
+        select * from d_class where c_id=#{c_id}
+    </select>
+    <!--修改班级信息-->
+    <update id="updateClass" parameterType="Class">
+        update d_class
+        <set>
+            <if test="c_classid!=null and c_classid!=0">
+                c_classid=#{c_classid},
+            </if>
+            <if test="c_classname !=null and c_classname !=''">
+                c_classname=#{c_classname},
+            </if>
+            <if test="c_counsellor !=null and c_counsellor !=''">
+                c_counsellor=#{c_counsellor},
+            </if>
+        </set>
+        where c_id = #{c_id}
+    </update>
+
+    <!--Mybatis使用Collection进行表关联查询关联一对多数据类型(class为一，student为多)，且需要有id-->
+    <!--Association关联一对一类型-->
+    <!--班级人员信息查询信息-->
+    <resultMap type="com.itheima.po.Class" id="cardAndInfo2">
+        <id property="c_id" column="c_id"/>
+        <result property="c_classid" column="c_classid"/>
+        <result property="c_classname" column="c_classname"/>
+        <result property="c_counsellor" column="c_counsellor"/>
+        <collection property="students" ofType="com.itheima.po.Student" javaType="ArrayList">
+            <id property="s_id" column="s_id"/>
+            <result property="s_studentid" column="s_studentid"/>
+            <result property="s_name" column="s_name"/>
+            <result property="s_sex" column="s_sex"/>
+            <result property="s_age" column="s_age"/>
+            <result property="s_phone" column="s_phone"/>
+            <result property="s_classid" column="s_classid"/>
+            <result property="s_classname" column="s_classname"/>
+            <result property="s_dormitoryid" column="s_dormitoryid"/>
+        </collection>
+    </resultMap>
+
+    <!--SQL选择属性与构造的resultMap属性名要一致-->
+    <select id="findClassStudent" parameterType="Class" resultMap="cardAndInfo2">
+        SELECT uclass.c_id as c_id,uclass.c_classid as c_classid,uclass.c_classname as c_classname,uclass.c_counsellor as c_counsellor,
+        student.s_id as s_id,student.s_studentid as s_studentid,student.s_name as s_name,student.s_sex as s_sex,student.s_age as s_age,
+        student.s_phone as s_phone,student.s_classid as s_classid,student.s_classname as s_classname,student.s_dormitoryid as s_dormitoryid
+        FROM d_class uclass join d_student student
+        on uclass.c_classid = student.s_classid
+        and uclass.c_classname = student.s_classname
+        where uclass.c_classid = #{c_classid}
+        and uclass.c_classname = #{c_classname}
+    </select>
+
+    <select id="getAll" resultType="Class">
+        select * from d_class;
+    </select>
+</mapper>