How to connect to the database in uniapp

With the development of mobile Internet, most applications involve the storage and reading of data. With the popularity of front-end technology and the increasing demand for cross-end development, Uniapp has become the first choice for more and more developers. If you are using Uniapp to develop mobile applications, you may encounter the need to connect to a database. So how to connect to the database in Uniapp?

1. Selection of database

Before you start connecting to the database, the first thing you need to consider is which type of database to choose. Currently, the more popular database types on the market include relational databases (such as MySQL, SqlServer, Oracle, etc.) and non-relational databases (such as MongoDB, Redis, etc.). Here we take MongoDB as an example.

2. Install MongoDB

If you have not installed MongoDB, you need to install the MongoDB client or server first. MongoDB supports multiple platforms. You can download the corresponding installation package from the official website to install it.

3. Installing Mongoose

Mongoose is a tool for operating MongoDB in Node.js. Mongoose can be installed via npm.

npm install mongoose --save

4. Create database connection

Create a db.js file under the utils folder in the project and add the following code:

const mongoose = require('mongoose');
mongoose.connect('mongodb://localhost:27017/uniapp-demo', {useNewUrlParser: true});

5. Write data model

Create a test.js file under the models folder in the project. Here we take a user as an example:

const mongoose = require('mongoose');
const userSchema = mongoose.Schema({
    name: String,
    age: Number,
    gender: String
});
module.exports = mongoose.model('user', userSchema);

6. To achieve data growth Delete, modify and check

Create a test.js file in the controllers folder and write the corresponding method of adding, deleting, modifying and checking. Here we take adding a user as an example:

const userModel = require('../models/test');
exports.addUser = async function(params) {
    try {
        const user = new userModel({
            name: params.name,
            age: params.age,
            gender: params.gender
        });
        await user.save();
        return {
            code: 200,
            message: '添加成功'
        }
    } catch (err) {
        return {
            code: 500,
            message: '添加失败'
        }
    }
}

7. Use

in the page to introduce the corresponding controller to the page, and you can call the corresponding method in the page :

import {addUser} from '../../controllers/test.js';
addUser({
  name: '张三',
  age: '23',
  gender: '男'
}).then(res => {
  console.log(res);
})

The above is the main process for Uniapp to connect to the database. I hope it will be helpful to you. Of course, in actual development, other more complex requirements will be encountered, and corresponding adjustments need to be made based on the actual situation.

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