How to achieve data persistence in a mutual attention system developed in PHP?

How to achieve data persistence in a mutual attention system developed in PHP?

With the rise of social networks, mutual follow systems have become more and more popular. Whether it is Weibo, WeChat or other social platforms, the mutual follow system is one of the important functions. For PHP developers, how to achieve data persistence in mutual attention systems is an important issue.

In PHP development, common data persistence methods include file storage, database storage and cache storage. The implementation methods of these three methods will be introduced below.

File storage is one of the simplest methods of data persistence. The following relationships can be stored on the server in the form of text files. For example, you can create a text file, each line represents a user's following relationship, the format is "User A follows user B". When user A unfollows user B, the corresponding line can be deleted from the file.

The disadvantage is that file storage is not suitable for processing large-scale data, and its performance is poor for frequent read and write operations. In addition, when operating files, you need to consider concurrent access issues and file permission settings. Therefore, file storage is not recommended for scenarios such as mutual attention systems that require high concurrent write operations.

Database storage is a common data persistence method, especially suitable for processing large-scale data. You can use a relational database (such as MySQL) or a non-relational database (such as MongoDB).

Taking MySQL as an example, you can create a user table and follow relationship table. The user table is used to store basic information of users, such as username, password, etc. The following relationship table is used to store the following relationship between users, for example, user A follows user B.

The structure of the user table can be designed as follows:

CREATE TABLE users (

id INT(11) PRIMARY KEY AUTO_INCREMENT,
username VARCHAR(50) NOT NULL,
password VARCHAR(255) NOT NULL

);

The structure of the concerned relationship table can be designed as follows:

CREATE TABLE followings (

id INT(11) PRIMARY KEY AUTO_INCREMENT,
user_id INT(11) NOT NULL,
target_user_id INT(11) NOT NULL,
FOREIGN KEY (user_id) REFERENCES users(id),
FOREIGN KEY (target_user_id) REFERENCES users(id)

);

In PHP code, you can use database connection tools (such as PDO or mysqli) to connect to the database when the user follows or unfollows , call relevant SQL statements to achieve data persistence.

Cache storage is a way of storing data in memory with high read speed. Common cache storage technologies include Memcached, Redis, etc.

Taking Redis as an example, you can use the Redis extension in PHP code to connect to the Redis service, and then use the corresponding commands to read and write data. For example, you can use Redis's set and get commands to store and read interest relationships.

It should be noted that cache storage is temporary and data may be lost due to cache failure or service restart. Therefore, when using cache storage, you need to consider how the data is persisted, such as saving the data to a database for recovery.

In summary, there are many ways to implement data persistence in the mutual attention system developed by PHP. File storage is simple and easy to implement, but it is not suitable for processing large-scale data. Database storage is suitable for processing large-scale data and has functions such as transactions and indexes, but it requires the design and management of database table structures. Cache storage is fast, but there is a risk of data loss, so the data persistence method needs to be considered.

According to actual needs, project scale, performance requirements, etc., you can choose a suitable data persistence method based on the advantages and disadvantages of the above three methods to implement the mutual attention system developed by PHP.

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