javascript - MongoDB: truth behind find({...}).limit(#) -

-

मोंगोडीबी में, । Find ({...})। सीमा (#) वास्तव में प्रश्नों की संख्या को सीमित करें?

मेरा मतलब है, जब आप db.collection.find (condition) करते हैं, तो क्या यह पहले से ही कम्प्यूटेशनल शक्ति को बर्बाद नहीं करता है, जो सभी परिणामों से मेल खाता है दी गई स्थिति? यदि ऐसा है, तो इसके बाद .limit () जोड़ता है, इसके बाद क्वेरी परिणामों से अनावश्यक तत्वों को हटा दें?

धन्यवाद इसे स्पष्ट करने के लिए बहुत कुछ! < / Div>

db.collection.find परिणाम की एक सरणी या समान नहीं देता है। प्रलेखन से:

जब ढूंढें () विधि "रिटर्न दस्तावेज़," ??? यह विधि वास्तव में दस्तावेजों को एक कर्सर लौट रहा है।

वास्तव में दस्तावेज तब होते हैं जब आप पुनरावृत्त करें कर्सर तो .limit कहता है कि कर्सर कहता है कि इसे पुनरावृत्त किया गया है।

यहां कर्सर के बारे में अधिक:

Comments

Post a Comment

Popular posts from this blog

php - how to change mysql_result($res, 0, "url"); to mysqli -

-
I do not know how to use mysqli_result like in the past. Is this OK? How is right WHERE status = 'popup' and creditsp> = 1 and (CH) from $ res = mysqli_query ($ con, "SELECT` id`,` usrid`, `url` site Lt; cf || cf = 0) sequence by rand () border 1 "); $ Urll = mysqli_result ($ res, 0, "url"); $ Ownerid = mysqli_result ($ res, 0, "Elixir"); $ Citid = mascile_salt ($ res, 0, "id"); Use fetch_assoc on the results: $ line = $ res-> gt; Fetch_assoc (); $ Urll = $ line ['url']; $ Owner = $ line ['nectar']; $ Site id = $ line ['id']; If there are more than one line, then: while ($ line = $ res-> fetch_assoc ()) {// process $ Line}
Read more

Delphi: missing interface declarations for UI Automation methods -

-
Such a basic question is, but I'm stuck ... I get I'm trying to start with UI Automation using Delphi 2007 (Win32) on Windows 7. It seems that I do not have to use some methods and types. I have the .NET Framework 4.x installed on this machine, but I have imported a type of library from the C: \ Program Files (x86) \ reference assembly \ Microsoft \ Framework \ v3.0 \ UIAutomationClient.dll ... ... I am looking for UIAutomationClient_TLB: UIAutomationClientMajorVersion = 1; UIAutomationClientMinorVersion = 0; I'm not sure that this is the problem (wrong version). I can declare the following with no problem: var UIAuto: IUIAutomation; Element: IUIAutomationElement; But the methods of IUIAutomationElement are missing. For example, there is nothing in the interface declaring this method: IUIAutomationElement.TryGetCurrentPattern () ... which msdn.microsoft According to .com, there is an interface method which is returning to at least NET 3.0. Where do...
Read more

android - How to attach an image from an app to gmail -

-
Text after "div class =" itemprop = "text"> The application to take a picture and attach it to the screen and attach to the second screen, 1 button on the 2nd Gmail Photo on; Send it to someone I am using this code for the second button View public void onClick (v) {// TODO Auto-generated method stub Intent intent = new Intent (Intent. ACTION_SENDTO, Uri.fromParts ("mailto", "test@gmail.com", tap)); Intent.putExtra (Intent.EXTRA_SUBJECT, "test"); Intent.putExtra (Intent.EXTRA_TEXT, "text"); Intent.putExtra (Intent.EXTRA_STREAM, imageUri); StartActivity (Intent.createChooser (meaning, "Choose an Email Client:")); } But this does not attach the photo to Gmail. It may be wrong here is the rest of the code. The public class increases the main activity activity {Private Static Ent TAKE_PICTURE = 1; Private Uri image Yuri; @ Override protected void saved create (bundled Instansstet) {Suprknkret (saved Insten...
Read more