单个请求的时候是 打印日志是
BEGIN SELECT　 UPDATE COMMIT 但是并发多了以后就不是配对执行开始乱了　 比如１００个请求，最后更新的status应该是１００　但是最后查询　status远小于１００　 测试代码　 app.js

var express = require('express');
var orm = require('orm');
var app = express();
var UserService=require('./userservice');
app.listen(80);
app.get("/", function (req, res) {
 UserService.readAndWrite(function(err,data){
res.send("<h1>"+data+"</h1>");
});
});

userservice.js

var mydb=require('./orm-db');

exports.readAndWrite =function(cb) {
	mydb.transCommit(function(err,db){
		var User = db.define("person", {
			id : { type: 'serial', key: true },
			name     : String,
			status :Number
		});

    db.transaction(function(err, txn){
		User.find({id:2}, function (err, row) {
		//	console.log("Task found: ", row.length);
			
            if(err){ return console.log(err) };       
                
                if(row[0]) {
				row[0].status +=1;

				row[0].save(function(err){
					if(err){ return  cb(err,'error'); };
				//	console.log("saved");
											
					txn.commit(function(err){
						if(err){ return console.log(err) };
				//		console.log("committed");
						return  cb(err,row[0].status);
					});
					/**/
					
				});
                
            }
			/*	
txn.commit(function (err) {
				if (!err) {
						console.log("success!");
				}
			});
			*/
                
			});
			
			
		});


	});
	
	
	
}    

orm-db.js

//https://github.com/dresende/node-orm-transaction
var orm=require('orm');
var transaction = require("orm-transaction");
var opts = {
    database: "test",
    protocol: "mysql",
    host: "127.0.0.1",
    Personname: "test",
    password: "test",
    query: {
        pool: true,
        debug:true
    },
};
var connection = null;
exports.transCommit=function(cb) {
    if (connection){
 
        return cb(null, connection); 
    }

 
  orm.connect(opts,function(err,db){
  
  db.use(transaction);
  
  
        // console.log(db.transaction);
      connection = db;
  db.settings.set('instance.cache', false);
    
cb(err,db);

    
});

}