13 lines
415 B
XML
13 lines
415 B
XML
<?xml version="1.0" encoding="UTF-8"?>
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<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
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<mapper namespace="cn.iocoder.mall.demo.business.dao.DemoProductMapper">
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<update id="updateQuantityReduce">
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UPDATE product
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SET quantity = quantity - #{quantity}
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WHERE id = #{id}
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AND quantity >= #{quantity}
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</update>
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</mapper>
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