Mybatis 增删改查 CRUD 四类

有四个分别是select insert delete update

这个是查询 他的ID对应的是Dao层的方法名 他的resultMap对应的是resultMap的名字

<select id="getall" resultMap="maop">
		SELECT *
		from Merch 
		<where>
		1=1
		<if test="page != null and rows != null">
			limit #{page},#{rows}
		</if>
		</where>
	</select>

这个是添加

<insert id="add">
		INSERT INTO merch(`Code`,`Name`,Factory,Package,Price) VALUE(#{Code},#{Name},#{Factory},#{Package},#{Price})
		
	</insert>

这个是删除

<delete id="delete">
		delete from merch where Code=#{Code}
	</delete>

这个是修改

<update id="update">
		update merch SET `Name`=#{Name},Factory=#{Factory},Package=#{Package},Price=#{Price} where `Code`=#{Code}
	</update>

这里是整个Mapper页面

<?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.fty.mapper.MerchMapper">
<resultMap type="com.fty.entity.Merch" id="maop">
		<id column="Code" property="Code" jdbcType="VARCHAR" />
		<result column="Name" property="Name" jdbcType="VARCHAR" />
		<result column="Factory" property="Factory" jdbcType="VARCHAR" />
		<result column="Package" property="Package" jdbcType="VARCHAR" />
		<result column="Price" property="Price" jdbcType="DECIMAL" />
	</resultMap>
	
	<sql id="Base_Column_List" >
      Code,Name,Factory,Package,Price
    </sql>



	<select id="getall" resultMap="maop">
		SELECT *
		from Merch 
		<where>
		1=1
		<if test="page != null and rows != null">
			limit #{page},#{rows}
		</if>
		</where>
	</select>
	
	<select id="getcount" resultType="int">
		SELECT count(*) from Merch
		
	</select>
	<insert id="add">
		INSERT INTO merch(`Code`,`Name`,Factory,Package,Price) VALUE(#{Code},#{Name},#{Factory},#{Package},#{Price})
		
	</insert>
	<delete id="delete">
		delete from merch where Code=#{Code}
	</delete>
	<update id="update">
		update merch SET `Name`=#{Name},Factory=#{Factory},Package=#{Package},Price=#{Price} where `Code`=#{Code}
	</update>
	<select id="getMerchAll" resultMap="maop">
		SELECT *
		from Merch 
		
	</select>
	<select id="getMerchGetAll" resultMap="maop">
		SELECT *
		from Merch 
		
	</select>
	
	
</mapper>

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