mysql增删改查，模糊查询及链表（一）

在Nodejs中mysql增删改查及链表

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1.连接mysql数据库

let mysql=require('mysql')
let connextion=mysql.createConnection({
    
    
    host:'localhost',
    // post:'3306',//可选，默认3306
    user:'root',//用户没
    password:'root',//密码
    database:'testdemo',//数据库名称
})
connextion.connect((err)=>{
    
    //建立连接
    if(err){
    
    
        console.log(err)
    }else{
    
    
        console.log('mysql连接成功')
    }
    

}); 

2.增删改查，模糊查询，链表

因为这里我们没有使用任何框架，所以使用的mysql原生语句

// let strSql="drop table user" //删除表
// let strSql="drop database testdemo" //删除库
// let strSql="create database testdemo" //创建库
// let strSql="select * from user" //查询数据
// let strSql="select * from user where id=2" //查询数据
// let strSql="select * from user where id>=2" //查询数据
// let strSql="select * from user where id>=2 and uaername='嘿嘿'" //查询数据    and是且---or是或
// let strSql="select * from user where uaername like '%小%'" //模糊查询
// let strSql="select * from user where uaername is NuLL" //查询真正的空，不是空字符串
// let strSql="select * from user where uaername is not NuLL" //查询不是空
var delSql = 'DELETE FROM user where id=6';//删除
var updSql = 'UPDATE user SET name = ?,url = ? WHERE Id =2';//更新
// let strSql="select * from user inner join teacher on user.classname=teacher.class" //连表查询
// let strSql="select * from user inner join teacher on user.classname=teacher.class where user.id=2" //连表查询
let strSql="select * from user right join teacher on user.classname=teacher.class where teacher.teacher_name='王老师'" //连表查询


// let strSql="insert into user (id,uaername,password) values (3,'嘿嘿','654564')" //插入数据
connextion.query(strSql,(err,res,fields)=>{
    
    
    console.log(res)
    
})