entity framework - Deferred Execution -


मैं जानना चाहूंगा कि आलसी लोड हो रहा है == स्थगित निष्पादन?

नहीं

"आलसी लोडिंग" आमतौर पर यह इंगित करने के लिए प्रयोग किया जाता है कि यदि आपके पास एक ऐसी संस्था का उदाहरण है जो किसी अन्य इकाई को संदर्भित करता है, तो कोड में प्रॉपर्टी को हटाना एक डेटाबेस क्वेरी को अमल में लाना होगा यदि वह पहले से ही लोड नहीं हुआ है, तो वह अन्य इकाई।

उदाहरण: 

  var foo = Context.Foos.First (); Var bar = foo.Bar; // आलसी लोडिंग के साथ, यह फ़ू के लिए डीबी क्वेरी का कारण बनता है।

"डिफर्ड निष्पादन" का आम तौर पर मतलब है कि जब तक कोई IQueryable चलती नहीं है तब तक कोई भी डेटाबेस क्वेरी जारी नहीं की जाएगी।

उदाहरण

<पूर्व> var foos = context.Foos.Where (f = & gt; f.Id == आईडी); // no डीबी क्वेरी; स्थगित हुए var foo = foos.First (); // अब एक क्वेरी जारी की जाती है। Var गिनती = foos.Count (); // एक अन्य क्वेरी जारी की गई है

Comments

Post a Comment

Popular posts from this blog

sql - dynamically varied number of conditions in the 'where' statement using LINQ -

I am using my first project LINQ (in mvc), so maybe there's something very simple that I remember. However, a day of searching and experimenting does not work, so it works. I am trying to write a LINQ query (Linux to SQL) in which in many cases where the statement is different from an OR or an AND. We do not know how many conditions are going in the query till runtime. This search is for filter control, where the user can choose multiple criteria for filtering. Select from table where table.col = 1 or table.col = 2 or table.col = 7 .... 'Other number of conditions Before I just create the SQL query as a string, while looping over all the situations. However, it seems that there should be a good way to do this in LINQ. I tried to use Expression trees, but they had a second thought for this moment on my head, where the lambda function was to be executed inside the statement such as: values ​​for matchingRows = matchingRows for each value Where (function (row) row.c...
Read more

c++ - QtQuick: QQmlApplicationEngine failed to load component qrc:/main.qml:23 Invalid attached object assignment -

Looking at my thoughts below, am I barking the wrong tree? Or in the information given below, am I misusing the Qt API to get an error in the title? I'm trying to modify the sample to work with the default coefficic project generated from Qt Creator 3.3.0 (OpenSource). Qt 5.4.0 (GCC 4.6.1, 64bit) Based on. The first thing to look at after the code is that I stand by: The sample uses the main.cpp: qmlRegisterType & lt ; Squircle & gt; ("OpenGLUARMM", 1, 0, "Squircle"); QQuickView view; View.setResizeMode (QQuickView :: SizeRootObjectToView); View.setSource (QUrl ("QRC: ///scenegraph/openglunderqml/main.qml")); View.show (); Some name changes in my name. CPP qmlRegisterType & lt; Menuscreen & gt; ("OpenGLUnderQML", 1, 0, "Main Screen"); QQmlApplicationEngine engine; Engine.load (QUrl (QStringLiteral ("QRC: /main.qml"))); I'm not sure that the difference in using QQmlApplicationEngine...
Read more

asp.net mvc - Dynamically Generated Ajax.BeginForm -

I have a problem with ASP.NET MVC Ajax forms. I generate many Ajax form in a table such as: & Lt; Input type = "submit" name = "activity" value = "add activity" / & gt; & Lt;%}% & gt; & Lt; / TD & gt; & Lt; / TR & gt; & Lt;%}% & gt; So far so good. When I post one of those forms, it gives a partial view in a div, and in this new partial view a new Ajax Beginnform (which is not in Genesis form) This second Ajax Beginnorf is exactly like the ones I got on the table, but when I post it, I do not get the "Ajax Post", but a normal post that sends me to a new page, I do not know whether the two Ajax forms What is the reason for the difference between, why is it the "dynamically generated" Ajax form behaves like a normal HTML form? By the way, I know that I can do it in different ways using javascript, but I would like to understand whether it can only be done using MVC helplars and Ajax lib...
Read more