Online buying system project design (core code)

Directory File Description

├── README - Doc document 
├── db - database constraint file 
├── mvnw 
├── mvnw.cmd 
├── pom.xml - project depends 
└── src 
    ├── main 
    │ ├── the Java 
    CN └── │ │ 
    │ │ └── tycoding 
    │ │ ├── SpringbootSeckillApplication.java - SpringBoot starter 
    │ │ ├── controller - MVC web tier 
    │ │ ├── dto - Some results unified package attribute, and entity similar 
    │ │ ├── entity - the entity class 
    │ │ ├── enums - manually defined dictionary enumeration parameters 
    │ │ ├── exception - consistent exception results 
    │ │ ├── mapper - Mybatis-Mapper mapping interface layer, or a layer called DAO 
    │ │ ├── redis - redis, jedis configuration 
    │ │ └── service - service layer 
    │ └── resources
    │ ├── application.yml - SpringBoot core configuration 
    │ ├── mapper - Mybatis-Mapper layer XML mapping file 
    │ ├── static - static storage resource page can be accessed directly through the browser 
    │ │ ├── css 
    JS ├── │ │ 
    │ │ └── lib 
    │ └── templates - template engine deposit required Thymeleaf HTML, can not be accessed directly in the browser 
    │ ├── page 
    │ └── public - public assemblies HTML page (head, tail) 
    └── the test - test files

XML mapping

    <update id="reduceStock">
        UPDATE seckill
        SET stock_count = stock_count - 1
        WHERE seckill_id = #{seckillId}
        AND start_time <= #{killTime}
        AND end_time >= #{killTime}
        AND stock_count > 0
    </update>

    <insert id="insertOrder">
        INSERT ignore INTO seckill_order(seckill_id, money, user_phone)
        VALUES (#{seckillId}, #{money}, #{userPhone})
    </insert>

　　

Core code　

redis injection　

 redis cache settings

 

In order to address the high concurrency, lock the data, prevent data overflow

 Began to spike　

Here, when clicking spike when the spike through time and md5 judgment is valid, then enter the inventory query