node 笔记

var mysql = require(‘mysql‘);
var connection = mysql.createConnection({
    host     : ‘localhost‘,
    user     : ‘root‘,
    password : ‘a11111111‘,
    database : ‘ccl_project_db‘
});
module.exports = connection;

connection.connect(function(err, conne) {
      if (err) throw err;
      const sql = `select * from user`;
      connection.query(sql, function(err, rows) {
          if (err) throw err;
          res.json(rows);
      });
});

var mysql = require(‘mysql‘);
var pool = mysql.createPool({    
    host     : ‘localhost‘,
    user     : ‘root‘,
    password : ‘a11111111‘,
    database : ‘ccl_project_db‘,
    port: 3306,
    stringifyObjects: true, //对象类型设置。默认false : RowDataPacket对象 , true : json对象
    dateStrings : true, //日期时间类型设置。默认false : 2016-08-31T02:00:32.000Z (UTC通用标准时) , true : 2016-08-31 10:00:32 (常用日期时间格式)
}); //数据库连接池

var query=function(sql,options,callback){  
    pool.getConnection(function(err,conn){  
        if(err){  
            callback(err,null,null);  
        }else{  
            conn.query(sql,options,function(err,results,fields){  
                //释放连接  
                conn.release();  
                //事件驱动回调  
                callback(err,results,fields);  
            });  
        }  
    });  
};  

module.exports = query;

const sql = `select * from user`;
    query(sql, ‘‘, function(err,results,fields){  
        if (err) throw err;
        res.json(results);
    });