Detailed introduction to the sample code sharing of nodejs operating mysql to implement addition, deletion, modification and query

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First you need toinstallmysql module: npm install mysql --save

Then create the user data table:

#Then use nodejs to add, delete, modify and check the database:

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nodejs操作mysql实现增删改查 .
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首先需要安装mysql模块：npm install mysql --save

然后创建user数据表：




接着使用nodejs对数据库进行增删改查：


//引入mysql模块
var mysql = require('mysql');
//链接数据库
var connection = mysql.createConnection({
  host:'localhost',
  user:'root',
  password:'root',
  database:'node',
})
connection.connect();
//查询数据
var sql = 'SELECT * FROM user';
connection.query(sql,function (err,result) {
  if(err){
    console.log('error');
    return;
  }
  console.log('-----------------查询----------------');
  console.log(result);
  console.log('-----------------查询结束----------------');
})

//增加数据
var addsql = 'INSERT INTO user(name,age,sex) VALUES(?,?,?)';
var addsqlparams = ['汪丹萍','24','女'];
connection.query(addsql,addsqlparams,function (err,result) {
  if(err){
    console.log('error');
    return;
  }
  console.log('-----------------新增成功----------------');
  console.log(result);
  console.log('-----------------结束----------------');
})

//修改数据
var modsql = 'UPDATE user SET name = ?,age = ? WHERE id = ?';
var modsqlparams = ['吕雪源love','26','1'];
connection.query(modsql,modsqlparams,function (err,result) {
  if(err){
    console.log('err');
    return;
  }
  console.log('--------------------------------');
  console.log(result);
  console.log('--------------------------------');
})

//删除数据
var delsql = 'DELETE FROM user where id = 2';
connection.query(delsql,function (err,result) {
  if(err){
    console.log('err');
    return;
  }
  console.log('----------删除-------------');
  console.log(result);
})


connection.end();

Finally run js:

#All additions, deletions, modifications and checks have been executed successfully.

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