mysql基础

1. 导入sql数据

  显示数据库: show batabases;
  选择数据库:  use 数据库名称;
  导入数据: source sql文件路径;
  查看数据是否导入成功：show tables;![请添加图片描述](https://www.icode9.com/i/ll/?i=1e9be0c5f56f46ac9805bdbae8ccbc4c.png?,type_ZHJvaWRzYW5zZmFsbGJhY2s,shadow_50,text_Q1NETiBAcXFfNDM3MzExNzY=,size_20,color_FFFFFF,t_70,g_se,x_16)

2.node连接mysql数据库CURD操作
（1）查

const mysql = require('mysql');
const connection = mysql.createConnection({
    host: 'localhost',
    user:'root',
    password:'********',
    port:'8080',
    database: 'test'
});
connection.connect();
connection.query('SELECT * FROM websites',(err,res)=>{
    if(err) {
        console.log('[SELECT ERROR] - ',err.message);
        return
    }
    console.log(JSON.stringify(res)+'\n');
})

（2）增

//第一种方法
 connection.query('insert into websites(id,name,url,alexa,country) value(6,"QQ","http://qq.com/","1","china")',(err,res)=>{
    if(err) {
        console.log('[SELECT ERROR] - ',err.message);
        return
    }
 });
// 第二种方法
const sql = 'insert into websites(id,name,url,alexa,country) value(6,?,?,?,?)';
const sqlparams = ["QQ","http://qq.com/","1","china"];
 connection.query(sql,sqlparams,(err,res)=>{
    if(err) {
        console.log('[SELECT ERROR] - ',err.message);
        return
    }
 });

3.改

//改
connection.query('update websites set name= ?,url = ? where id = ?',["wx","http:wx.com/",6],(err,res)=>{
    if(err) {
        console.log('[SELECT ERROR] - ',err.message);
        return
    }
    console.log(JSON.stringify(res)+'\n');
})

4.删

// 查
connection.query('SELECT * FROM websites',(err,res)=>{
    if(err) {
        console.log('[SELECT ERROR] - ',err.message);
        return
    }
    console.log(JSON.stringify(res)+'\n');
})