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About Node JS Asynchronous [duplicate]

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0

This question already has an answer here:

• 
  How do I return the response from an asynchronous call?
  
  33 answers
  
  


• 
  Why is my variable unaltered after I modify it inside of a function? - Asynchronous code reference
  
  6 answers
  
  

I don't why both updateOne and updateMany are executed, please explain :(
I thinks one of them should be finished first and call its callback, execute its db.close().
Please show me the order of the executions
Thanks a lot

var MongoClient = require('mongodb').MongoClient;
var url = 'mongodb://localhost:27017';

MongoClient.connect(url, useNewUrlParser: true , (err, db) => 
 if (err) throw err;


 var col = db.db('mydb').collection('user');

 var query = address: "Thanh Xuan, Ha Noi" ;
 var newVal = $set: user: 'thedblaster', address: 'Nguyen Xien' ;
 //Update first occurence
 col.updateOne(query, newVal, (err, res) => 

 if (err) throw err;
 console.log(`Modi $res.result.nModified file`);
 db.close();
 );

 var aQuery = user: /a/ ;
 var newUs = $set: user: 'K64-UET' ;
 //Update all
 col.updateMany(aQuery, newUs, (err, res) => 

 if (err) throw err;
 console.log(`Modified $res.result.nModified files`);
 db.close();
 );


);

javascript node.js asynchronous

share|improve this question

edited Mar 7 at 13:13

Liam

16.4k1678130

asked Mar 7 at 13:08

le duyle duy

1

marked as duplicate by Liam, Quentin javascript
Users with the  javascript badge can single-handedly close javascript questions as duplicates and reopen them as needed.

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Mar 7 at 13:15

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Please show me the order of the executions they are executed in order so updateOne then updateMany, but they could return in any order
  
  – Liam
  Mar 7 at 13:14
  

  
  
  
  

add a comment | 

0

This question already has an answer here:

• 
  How do I return the response from an asynchronous call?
  
  33 answers
  
  


• 
  Why is my variable unaltered after I modify it inside of a function? - Asynchronous code reference
  
  6 answers
  
  

I don't why both updateOne and updateMany are executed, please explain :(
I thinks one of them should be finished first and call its callback, execute its db.close().
Please show me the order of the executions
Thanks a lot

var MongoClient = require('mongodb').MongoClient;
var url = 'mongodb://localhost:27017';

MongoClient.connect(url, useNewUrlParser: true , (err, db) => 
 if (err) throw err;


 var col = db.db('mydb').collection('user');

 var query = address: "Thanh Xuan, Ha Noi" ;
 var newVal = $set: user: 'thedblaster', address: 'Nguyen Xien' ;
 //Update first occurence
 col.updateOne(query, newVal, (err, res) => 

 if (err) throw err;
 console.log(`Modi $res.result.nModified file`);
 db.close();
 );

 var aQuery = user: /a/ ;
 var newUs = $set: user: 'K64-UET' ;
 //Update all
 col.updateMany(aQuery, newUs, (err, res) => 

 if (err) throw err;
 console.log(`Modified $res.result.nModified files`);
 db.close();
 );


);

javascript node.js asynchronous

share|improve this question

edited Mar 7 at 13:13

Liam

16.4k1678130

asked Mar 7 at 13:08

le duyle duy

1

marked as duplicate by Liam, Quentin javascript
Users with the  javascript badge can single-handedly close javascript questions as duplicates and reopen them as needed.

StackExchange.ready(function()
if (StackExchange.options.isMobile) return;

$('.dupe-hammer-message-hover:not(.hover-bound)').each(function()
var $hover = $(this).addClass('hover-bound'),
$msg = $hover.siblings('.dupe-hammer-message');

$hover.hover(
function()
$hover.showInfoMessage('',
messageElement: $msg.clone().show(),
transient: false,
position: my: 'bottom left', at: 'top center', offsetTop: -7 ,
dismissable: false,
relativeToBody: true
);
,
function()
StackExchange.helpers.removeMessages();

);
);
);
Mar 7 at 13:15

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Please show me the order of the executions they are executed in order so updateOne then updateMany, but they could return in any order
  
  – Liam
  Mar 7 at 13:14
  

  
  
  
  

add a comment | 

This question already has an answer here:

• 
  How do I return the response from an asynchronous call?
  
  33 answers
  
  


• 
  Why is my variable unaltered after I modify it inside of a function? - Asynchronous code reference
  
  6 answers
  
  

I don't why both updateOne and updateMany are executed, please explain :(
I thinks one of them should be finished first and call its callback, execute its db.close().
Please show me the order of the executions
Thanks a lot

var MongoClient = require('mongodb').MongoClient;
var url = 'mongodb://localhost:27017';

MongoClient.connect(url, useNewUrlParser: true , (err, db) => 
 if (err) throw err;


 var col = db.db('mydb').collection('user');

 var query = address: "Thanh Xuan, Ha Noi" ;
 var newVal = $set: user: 'thedblaster', address: 'Nguyen Xien' ;
 //Update first occurence
 col.updateOne(query, newVal, (err, res) => 

 if (err) throw err;
 console.log(`Modi $res.result.nModified file`);
 db.close();
 );

 var aQuery = user: /a/ ;
 var newUs = $set: user: 'K64-UET' ;
 //Update all
 col.updateMany(aQuery, newUs, (err, res) => 

 if (err) throw err;
 console.log(`Modified $res.result.nModified files`);
 db.close();
 );


);

javascript node.js asynchronous

share|improve this question

edited Mar 7 at 13:13

Liam

16.4k1678130

asked Mar 7 at 13:08

le duyle duy

1

var MongoClient = require('mongodb').MongoClient;
var url = 'mongodb://localhost:27017';

MongoClient.connect(url, useNewUrlParser: true , (err, db) => 
 if (err) throw err;


 var col = db.db('mydb').collection('user');

 var query = address: "Thanh Xuan, Ha Noi" ;
 var newVal = $set: user: 'thedblaster', address: 'Nguyen Xien' ;
 //Update first occurence
 col.updateOne(query, newVal, (err, res) => 

 if (err) throw err;
 console.log(`Modi $res.result.nModified file`);
 db.close();
 );

 var aQuery = user: /a/ ;
 var newUs = $set: user: 'K64-UET' ;
 //Update all
 col.updateMany(aQuery, newUs, (err, res) => 

 if (err) throw err;
 console.log(`Modified $res.result.nModified files`);
 db.close();
 );


);

share|improve this question

edited Mar 7 at 13:13

Liam

16.4k1678130

asked Mar 7 at 13:08

le duyle duy

1

share|improve this question

edited Mar 7 at 13:13

Liam

16.4k1678130

asked Mar 7 at 13:08

le duyle duy

1

edited Mar 7 at 13:13

Liam

16.4k1678130

edited Mar 7 at 13:13

Liam

16.4k1678130

asked Mar 7 at 13:08

le duyle duy

1

asked Mar 7 at 13:08

le duyle duy

1