gold-java/src/main/resources/mapper/RedMapper.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.example.demo.mapper.Temporary.RedMapper">
    <insert id="upsertAndAdd" parameterType="map">
        INSERT INTO red (jwcode, type, sum)
        VALUES (
                   #{jwcode},
                   #{type},
                   #{sum}
               )
            ON DUPLICATE KEY UPDATE
                                 sum = sum + #{sum}
    </insert>
    <update id="update">
        update red set sum = sum - #{sum} where jwcode = #{jwcode} and type = #{type}
    </update>
    <select id="selectSum" resultType="java.math.BigDecimal">
        select sum from red where jwcode=#{jwcode} and type=#{type}
    </select>
    <select id="selectJwcode" resultType="boolean">
        SELECT EXISTS(
            SELECT 1 FROM red WHERE jwcode = #{jwcode}
        )
    </select>
</mapper>