demo/src/main/resources/mapper/AreaDao.xml

<?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.imooc.demo.dao.AreaDao">

<select id="queryArea" resultType="com.imooc.demo.entity.Area">
	select 
	area_id,
	area_name,
	priority,
	create_time,
	last_edit_time
	from tb_area
	order by priority desc
</select>
<select id="queryAreaById" resultType="com.imooc.demo.entity.Area">
	select 
	area_id,
	area_name,
	priority,
	create_time,
	last_edit_time
	from tb_area
	where
	area_id=#{areaId}
</select>

<insert id="insertArea" useGeneratedKeys="true" keyProperty="areaId"
	keyColumn="area_id" parameterType="com.imooc.demo.entity.Area">
	insert into
	tb_area(area_name,priority,
	create_time,last_edit_time)
	values
	(#{areaName},#{priority},#{createTime},#{lastEditTime})
	
</insert>

<update id="updateArea" parameterType="com.imooc.demo.entity.Area">
	update tb_area
	<set>
		<if test="areaName !=null">area_name=#{areaName},</if>
		<if test="priority !=null">priority=#{priority},</if>
		<if test="lastEditTime !=null">last_edit_time=#{lastEditTime}</if>
	</set>
	where area_id=#{areaId}
</update>


<delete id="deleteArea" parameterType="Integer">
	delete from
	tb_area
	where
	area_id = #{areaId}
</delete>
</mapper>