node.js - Using count() or findOne() for better performance? -


I am using nodes and native MongoDB drivers to create an application. I want to make sure that a record exists with a specific situation and I want to know which method is better? 

  collection.find ({...}). Count (function (count, count) {if (calculation> 0) {// blah blah}})   
 or  
  collection.findOne ({...}, Function (mistake, object) {// blah blah}}    
 
 See 
 I believe  find  with the  border (1)  is the way to go in your case. (If you receive the actual document data with the query If you want to do this, use  findOne .)  
 In the context of  mongodb-native , the code will look something like this  
  function recordsexists (selector, callback) {collection.find (selector, {limit: 1}, function (mistake, cursor) {ifrr return callback (error); cursor count (function (err, cnt) {Return callback (err, !! cnt);});});}   
  
 I'm a bit confused about this:  collection.find ({...}). The original driver allows to do this? Is it  cursor.count ? Anyway,  border  your friend is here

Comments

Post a Comment