Download mysql via npm. (Global installation: npm i mysql --g or local installation: npm i mysql --save)
Create a data pool file (mysql_config) and a mysql call statement (mysql_query) in the file
in mysql_config
//连接数据库数据池
let config = {
connectionLimit: 5,
host: 'localhost',
user: 'root',//数据库创建时候的名字
password: '123456',//数据库创建时候的密码
database: 'test'//数据库的名字(你的表数据功能都在这里面)
}
export { config }//暴露出去
in mysql_query
//封装sql语句
import mysql from 'mysql';
import { config } from './mysql_config.js';//导入数据池
let pool = mysql.createPool(config);
let query_api = {
query: (sql, params, callback) => {
pool.getConnection((error, connection) => {
connection.query(sql, params, (error, results) => {
if (error) {
console.log(error);
return;
}
callback(results)
})
connection.release();
})
}
}
export { query_api }
In the required file (test) call
//登录功能
import exp from 'express';
//导入封装好的sql语句
import { query_api } from '../mysql_query.js';
let login = exp();
//登录
login.post('/', (req, res) => {
//如果有条件需要的数据,在后面条件处用英文?占用,在调用语句[]中传入数据
let sql = `select * from 表名 where 条件1=? and 条件2=?`;
//注意:导入时,要按占用的数据顺序依次倒入
query_api.query(sql, [获取数据1(对应条件1), 获取数据2(对应条件2)], (data) => {
//data:返回的数据
res.send(data);
})
})
export { login };
You can use import to import, or you can use require to import. Use the require import syntax: let query_api = require('../mysql_query.js')