Establish an inventory change record table for the grocery shopping system in MySQL

To establish the inventory change record table of the grocery shopping system in MySQL, specific code examples are required

1. Background

With the continuous development of e-commerce , shopping behavior has moved from offline to online, and more and more people choose to shop on e-commerce platforms. For the grocery shopping system, inventory is one of the most important parts of the system, and inventory management is also the most critical part of the system.

In order to ensure that inventory management in the grocery shopping system can be carried out efficiently, inventory changes need to be recorded in a timely manner, so that inventory problems can be discovered in a timely manner so that they can be resolved in a timely manner.

2. Establish an inventory change record table for the grocery shopping system in MySQL

Based on the above issues, we can create an inventory change record table in MySQL to record the changes in the grocery shopping system. Inventory change information. The following is a specific table creation code example:

CREATE TABLE inventory_change_record (
id bigint(20) NOT NULL AUTO_INCREMENT,
product_id bigint(20) NOT NULL COMMENT 'product id',
change_amount int(11) NOT NULL COMMENT 'change amount',
change_time datetime NOT NULL COMMENT 'Change time',
change_type tinyint(4) NOT NULL COMMENT 'Change type: 1. Inbound; 2. Outbound',
operator varchar( 255) NOT NULL COMMENT 'Change personnel',
PRIMARY KEY (id)
) ENGINE=InnoDB AUTO_INCREMENT=1 DEFAULT CHARSET=utf8mb4 COMMENT='Inventory change record table';

In the above table building code, we have defined the following fields:

• id: primary key, self-increasing;
• product_id: product id, used to record which product The inventory has changed;
• change_amount: change quantity, used to record the inventory change quantity of the product;
• change_time: change time, used to record the time when the inventory change occurred;
• change_type: Change type, used to distinguish whether it is inbound or outbound, 1 means inbound, 2 means outbound;
• operator: Change operator, used to record the executor of the inventory change operation.

3. Inventory change record table using MySQL in the grocery shopping system

In the grocery shopping system, we can use the inventory change record table in the following places:

1. Warehousing operation
   When a new product is put into stock, we can insert a record with a change type of 1 (warehousing) into the inventory change record table when performing the warehousing operation.

The following is an example of the warehousing operation code:

//Insert inventory change record
INSERT INTO inventory_change_record (product_id, change_amount,change_time,change_type,operator) VALUES (1,100,'2022-05-01 10:00:00',1 ,'Zhang San');

2. Outbound operation
   When a product is outbound, we can insert a change type of 2 into the inventory change record table when performing the outbound operation. (outbound) records.

The following is an example of the outbound operation code:

//Insert inventory change record
INSERT INTO inventory_change_record (product_id, change_amount,change_time,change_type,operator) VALUES (1,50,'2022-05-01 14:00:00' ,2,'李思');

3. Query inventory change record
   When we need to query the inventory change record of a product, we can query based on the product id and arrange it in reverse chronological order .

The following is a code example for querying inventory change records:

//Querying inventory change records
SELECT * FROM inventory_change_record WHERE product_id = 1 ORDER BY change_time DESC;

IV. Summary

The above is the implementation method of the inventory change record table using MySQL in the grocery shopping system. By establishing an inventory change record table, we can manage inventory more efficiently, discover and solve inventory problems in a timely manner, and ensure the normal operation of the system.

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