How to design an extensible MySQL table structure to implement social network functions?

How to design an extensible MySQL table structure to implement social network functions?

Overview:
Social network platforms play an important role in today's Internet era, and more and more users are joining them. Designing a scalable MySQL table structure is critical to supporting large-scale users and rich social features. This article will introduce how to design an extensible MySQL table structure and provide code examples to implement common social network functions.

Design of User Table:
The user table is a basic part of the social network, which stores the user's basic information. The following is an example design of a user table:

CREATE TABLE users (
id int(11) NOT NULL AUTO_INCREMENT,
username varchar(50) NOT NULL,
password varchar(50) NOT NULL,
email varchar(255) NOT NULL,
created_at timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP,
PRIMARY KEY (id),
UNIQUE KEY username (username),
UNIQUE KEY email (email)
) ENGINE=InnoDB AUTO_INCREMENT=1 DEFAULT CHARSET=utf8mb4;

In the user table, idThe field is the user's unique identifier and is managed using an auto-incrementing primary key. The username field stores the user's username, password stores the user's login password, and email stores the user's email address. The created_at field stores the user's registration time. The username and email fields ensure the uniqueness of the data by setting unique indexes.

Design of Friendship Table:
One of the common functions in social networks is to add friends. The following is a design example of a friend relationship table:

CREATE TABLE friendships (
user_id int(11) NOT NULL,
friend_id int(11) NOT NULL,
created_at timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP,
PRIMARY KEY (user_id,friend_id),
KEY friend_id (friend_id),
CONSTRAINT friendships_ibfk_1 FOREIGN KEY (user_id) REFERENCES users (id) ON DELETE CASCADE,
CONSTRAINT friendships_ibfk_2 FOREIGN KEY (friend_id) REFERENCES users (id) ON DELETE CASCADE
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;

In the friend relationship table, the user_id field stores the user's ID, and the friend_id field Stores the user's friend ID.
By setting user_id and friend_id as composite primary keys, you can ensure the uniqueness of each friend relationship and avoid adding friends repeatedly. In addition, by setting foreign key constraints, the consistency of the friend relationship and the user table can be maintained.

Design of Activity Table:
In social networks, users can post updates, likes and comments. The following is a design example of a dynamic table:

CREATE TABLE activities (
id int(11) NOT NULL AUTO_INCREMENT,
user_id int(11) NOT NULL,
type enum('post','like','comment') NOT NULL,
content text NOT NULL ,
created_at timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP,
PRIMARY KEY (id),
KEY user_id (user_id),
CONSTRAINT activities_ibfk_1 FOREIGN KEY (user_id) REFERENCES users (id) ON DELETE CASCADE
) ENGINE =InnoDB AUTO_INCREMENT=1 DEFAULT CHARSET=utf8mb4;

In the dynamic table, the id field is the unique identifier of the dynamic, and the user_id field stores the user ID that publishes the dynamic , the type field stores the dynamic type, which can be posts, likes or comments. The content field stores dynamic content, and the created_at field stores dynamic creation time.

Through the above table structure design, common social functions can be supported and the scalability and consistency of the table can be guaranteed. In actual development, the table structure can also be adjusted and expanded according to specific business needs.

Summary:
Designing an extensible MySQL table structure to implement social network functions requires taking into account the design of core functions such as user tables, friend relationship tables, and dynamic tables. By setting primary keys, unique indexes and foreign key constraints, the consistency and integrity of the data can be guaranteed. At the same time, the design of the table structure should take into account changes in business requirements and scalability so that it can meet changing user needs.

Note: The above is a simple table structure design example. In actual development, it should be appropriately modified and optimized according to specific needs.

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