ADD file via upload

flower_back/src/main/java/com/example/flower/mapper/xml/ClassMapper.xml

@@ -0,0 +1,42 @@
+<?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.example.flower.mapper.ClassMapper">
+    <select id="classList" resultType="com.example.flower.entity.Class">
+        select *
+        from flower.class
+    </select>
+    <select id="classListByQuery" resultType="com.example.flower.entity.Class">
+        select *
+        from flower.class
+        <where>
+            <if test="class_name != null and class_name != '' ">
+                and class_name like concat('%',#{class_name},'%')
+            </if>
+        </where>
+    </select>
+    <insert id="classAdd" useGeneratedKeys="true" keyProperty="class_id" parameterType="com.example.flower.entity.Class">
+        insert into flower.class(class_name)
+            value (#{class_name})
+    </insert>
+    <delete id="classDeletePer">
+        delete
+        from flower.class
+        where class_id = #{class_id}
+    </delete>
+    <delete id="classDeleteMul" parameterType="Integer">
+        delete from flower.class where class.class_id in
+        <foreach collection="class_ids" open="(" close=")" separator="," item="id">
+            #{id}
+        </foreach>
+    </delete>
+    <select id="classInfo" resultType="com.example.flower.entity.Class">
+        select *
+        from flower.class
+        where class_id = #{class_id}
+    </select>
+    <update id="classModify" parameterType="com.example.flower.entity.Class">
+        update flower.class
+        set class_name=if(#{class_name} is not null and #{class_name} != '',#{class_name},class_name)
+        where class.class_id = #{class_id}
+    </update>
+</mapper>