How to store data in uniapp

With the rapid development of mobile applications, in order to provide better user experience and enhanced functions, mobile applications also need to store user data. Uniapp is a cross-platform mobile application development framework that allows developers to develop once and publish across multiple platforms with good performance and ease of development. This article will introduce common data storage methods and implementation methods in Uniapp.

1. Local storage

1.1 uni-storage

Uni-storage is a lightweight local storage solution provided by Uniapp, which allows developers to use key-value pairs way to store data. Similar to Web local storage solutions, uni-storage supports localStorage, sessionStorage and cookies. Use uni-storage to store small amounts of data in local storage, such as user preferences, user login information, etc.

Before using uni-storage, you need to add the "torage":{} module to the manifest.json file:

"modules":{
    "storage":{}
}

In the code, you can use the uni.setStorage and uni.getStorage methods to store and retrieve data. For example:

uni.setStorageSync('username', 'Tom');
var username = uni.getStorageSync('username');

1.2 SQLite

SQLite is a free database engine that supports multiple platforms, including Android, iOS, and Web. Unlike other relational databases, SQLite database does not require a separate server. It stores the database in a file, which makes it ideal for the local storage needs of mobile applications.

Uniapp provides a UniSQLite plug-in that allows developers to use SQLite databases for data storage. Add the following code to the manifest.json file:

"app-plus": {
    "plugins": {
        "UniSQLite": {
            "version": "1.0.0",
            "provider": "uni-app.cn"
        }
    }
}

In the code, you can use the following code to create a SQLite database and perform related operations:

var db = uni.requireNativePlugin('UniSQLite');
var res = db.exec({
    dbName: 'test.db',
    statement: 'CREATE TABLE IF NOT EXISTS user (id INTEGER, name TEXT)'
});

2. Cloud Storage

As mobile applications become more popular, cloud storage becomes more and more important. Uniapp also provides a variety of cloud storage solutions to meet different business needs.

2.1 Cloud Database

Cloud database is a fully managed database service that provides scalable, high-performance and secure database solutions. Uniapp provides cloud database solutions using the uniCloud platform. Data storage and management can be easily carried out using cloud databases, and it also provides a variety of data query and analysis methods.

Before using the cloud database, you need to add "cloudfunctions":{} module in the manifest.json file:

"modules":{
    "cloudfunctions":{}
}

In the code, you can use the following code to connect to the cloud database and perform related operations Operation:

var db = uniCloud.database()
var collection = db.collection('user')
collection.add({
    name: 'Tom',
    age: 18
}).then(res => {
    console.log(res)
})

2.2 Cloud function

Cloud function is a code executed in the cloud, which can access cloud database, object storage, message queue and other services. Uniapp provides cloud function solutions using the uniCloud platform. Using cloud functions, complex calculations and operations can be performed on the cloud, such as data analysis, image processing, etc.

Before using cloud functions, you need to add "cloudfunctions":{} module to the manifest.json file:

"modules":{
    "cloudfunctions":{}
}

In the code, you can use the following code to call cloud functions:

uniCloud.callFunction({
    name: 'hello',
    data: {
        name: 'Tom'
    },
    success: res => {
        console.log(res)
    }
})

The above are common data storage methods and implementation methods in Uniapp. In actual application development, developers need to choose the most suitable storage solution based on different business needs. Through the combination of local storage and cloud storage, more complete and robust data management and storage functions can be achieved.

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