22 lines
836 B
XML
22 lines
836 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="com.atguigu.tingshu.account.mapper.UserAccountMapper">
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<resultMap id="userAccountMap" type="com.atguigu.tingshu.model.account.UserAccount" autoMapping="true">
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</resultMap>
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<!-- 用于select查询公用抽取的列 -->
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<sql id="columns">
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id,user_id,total_amount,lock_amount,available_amount,total_income_amount,total_pay_amount,create_time,update_time,is_deleted
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</sql>
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<!--采用数据库悲观锁避免账户金额超扣-->
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<select id="checkDeduction" resultType="com.atguigu.tingshu.model.account.UserAccount">
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SELECT * from user_account where user_id = #{userId} and available_amount >= #{amount} and is_deleted =0 for update
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</select>
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</mapper>
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