js promise 风格编程

使用q

/**
* Created by ThinkCat on 15/11/24.
*/
var mysql = require('./db/db');
var Q = require('q');

//var getConnection = function(){
//    var deferred = Q.defer();
//    mysql.MySqlDb.getConnection(function(err,connection){
//        console.log('connection:',connection);
//        deferred.resolve(connection);
//    });
//    return deferred.promise;
//}
//
//var doQuery = function(connection){
//    var deferred = Q.defer();
//    connection.query('select * from user',function(err,rows){
//        console.log('rows:',rows);
//        deferred.resolve(rows);
//    });
//    return deferred.promise;
//}

var getConnection = function(){
var deferred = Q.defer();
deferred.resolve('this is a connection');
return deferred.promise;
};

var doQuery = function(connection){
var deferred = Q.defer();
deferred.resolve(connection + ',select * from user');
return deferred.promise;
};

function main(){
getConnection()
.then(doQuery)
.done(
function(data){
console.log('final:',data);
},
function(err){
console.log('error:',err);
}
);
}

main();