学习Node.js（连接 MySQL）

安装数据库驱动

$ cnpm install mysql

连接数据库

var mysql      = require('mysql');
var connection = mysql.createConnection({
  host     : '',
  user     : '',
  password : '',
  database : ''
});
 
connection.connect();
 
connection.query('SELECT 1 + 1 AS solution', function (error, results, fields) {
  if (error) throw error;
  console.log('The solution is: ', results[0].solution);
});

数据库操作( CURD )

查询数据

var mysql  = require('mysql');  
 
var connection = mysql.createConnection({     
  host     : '',       
  user     : '',              
  password : '',       
  port: '',                   
  database: '' 
}); 
 
connection.connect();
 
var  sql = 'SELECT * FROM websites';
//查
connection.query(sql,function (err, result) {
        if(err){
          console.log('[SELECT ERROR] - ',err.message);
          return;
        }
 
       console.log('--------------------------SELECT----------------------------');
       console.log(result);
       console.log('------------------------------------------------------------\n\n');  
});
 
connection.end();

插入数据

var mysql  = require('mysql');  
 
var connection = mysql.createConnection({     
  host     : '',       
  user     : '',              
  password : '',       
  port: '',                   
  database: '' 
}); 
 
connection.connect();
 
var  addSql = 'INSERT INTO websites(Id,name,url,alexa,country) VALUES(0,?,?,?,?)';
var  addSqlParams = ['菜鸟工具', 'https://c.runoob.com','23453', 'CN'];
//增
connection.query(addSql,addSqlParams,function (err, result) {
        if(err){
         console.log('[INSERT ERROR] - ',err.message);
         return;
        }        
 
       console.log('--------------------------INSERT----------------------------');
       //console.log('INSERT ID:',result.insertId);        
       console.log('INSERT ID:',result);        
       console.log('-----------------------------------------------------------------\n\n');  
});
 
connection.end();

更新数据

var mysql  = require('mysql');  
 
var connection = mysql.createConnection({     
  host     : '',       
  user     : '',              
  password : '',       
  port: '',                   
  database: '' 
}); 
 
connection.connect();
 
var modSql = 'UPDATE websites SET name = ?,url = ? WHERE Id = ?';
var modSqlParams = ['菜鸟移动站', 'https://m.runoob.com',6];
//改
connection.query(modSql,modSqlParams,function (err, result) {
   if(err){
         console.log('[UPDATE ERROR] - ',err.message);
         return;
   }        
  console.log('--------------------------UPDATE----------------------------');
  console.log('UPDATE affectedRows',result.affectedRows);
  console.log('-----------------------------------------------------------------\n\n');
});
 
connection.end();

删除数据

var mysql  = require('mysql');  
 
var connection = mysql.createConnection({     
  host     : '',       
  user     : '',              
  password : '',       
  port: '',                   
  database: '' 
}); 
 
connection.connect();
 
var delSql = 'DELETE FROM websites where id=6';
//删
connection.query(delSql,function (err, result) {
        if(err){
          console.log('[DELETE ERROR] - ',err.message);
          return;
        }        
 
       console.log('--------------------------DELETE----------------------------');
       console.log('DELETE affectedRows',result.affectedRows);
       console.log('-----------------------------------------------------------------\n\n');  
});
 
connection.end();