c# - Why would I want to stay away from DataSets, and what are the alternatives? -

-

मुझे यहां एक दिलचस्प चर्चा मिली:

उद्धरण:

डेटासेट आपकी डेटा परत कोड के लिए उप-समस्त शौकिया समाधान हैं ... उनका उपयोग करना बंद करो और कोड सीखें! :)

डेटासेट्स के बारे में आपकी राय क्या है, सिर्फ कस्टम वर्गों को बाहर कर देना और उन लोगों के साथ काम करना? अन्य विकल्प क्या हैं?

एक बड़ी खामी यह है कि डेटासेट्स इन-मेमरी डेटा स्ट्रक्चर हैं जिसका मतलब है कि राशि खपत की जाने वाली स्मृति आपको रिकॉर्ड्स की मात्रा के लिए रैखिक होती है (यानी ओ (एन) स्पेस कॉम्प्लेसिटी) सर्वर साइड ऐप पर यह स्केलेबिलिटी को मार डालेगा।

यदि आप कस्टम क्लास टी को परिभाषित करते हैं, तो आपके डेटा एक्सेस परत से आईईइन्मेरेबल & lt; T> लौटाने से आपको अपने डेटा स्रोत से डेटा को कुशलतापूर्वक स्ट्रीम करने में मदद मिलती है (उदाहरण के लिए एक लिनक ओ (1) जटिलता के साथ एसक्यूएल IQueryable प्रदाता के लिए।

नोट: यदि आप अपने डेटा एक्सेस परत से सूची & lt; T> या संग्रह & lt; T> लौटाते हैं, तो वही समस्या आती है क्योंकि ये भी इन-मेमरी स्ट्रक्चर । मैंने देखा है कि बहुत से लोगों ने इसे स्केलेबिलिटी पर विचार किए बिना भव्यता के नाम पर किया है।


Comments

Post a Comment

Popular posts from this blog

objective c - iPhone and it's wireless area -

-
Is this a way to find other iPhones in the category of wireless areas? So I give an example. I'm staying at the airport somewhere I have an iPhone too. I and the other iPhone owners are playing the same game. Is there any way to warn me and the other player that we are close to each other? Does this work even if we are not on the same wireless network, or there is no wireless? And if there is any way to do this, can you give me some starting point? Like a link where I can learn something like this or maybe this is probably the name of this process, because I do not know how to search about this topic in Google. Thanks in advance! Can be completed with peer-to-peer discovery and connectivity you are describing Game Kit Framework Originally I thought it works only through Bluetooth, but after watching it immediately, it seems that WiFi is also supported. Hope it helps!
Read more

unix - Listing all shared memory segments used by a process on AIX5.3+ -

-
I would like to find all the shared memory segments used by a given process I am particularly interested in detecting shmid That's why I can use it in call (shmctl). On Solaris I will just read / proc / $ PID / map to find that information (field pr_shmid) The content of that file is defined by struct prmap_t in the sys / procfs format. Ax also has a / proc / $ PID / map file. Any project is a primate, but unfortunately it has been projected in pr_shmid field. Any ideas how can I get it on AIX5.3 +? I do not particularly know about AX, but I think that ipcs command is quite standard where SysV IPC is supported, so I want to get the ipcs -m command to give the appropriate code; If you can not find a better method, then there may be an option to parse its output.
Read more

.net - Self Tracking Entities (STE)'s and partial updates with EF4 and mVC2 -

-
I have an MVC2 app where I'm starting to use 'I'm looking for some explanation How updates should work. Background: If I have a blog entity with related category entities and related posts / comments, In MVC I am providing a view with main blog unit and categories but not related posts. When I post back the blog unit to the server, then I can see the related categories but not the post (because they were not in the view) back in the unit ordered on the server. In addition, there is a changing state of the blog unit's 'edited'. Then I'll try to call the implementer () and SaveChanges () to make an update to the unit and post it With FK fails due to relationships and the fact is that there are related posts in the database but I am returning back. With some more trials ... if I take a current example of the blog unit (with all related FK entities), while connected to the server (state = unchanged), modify the property (State = modified) and i...
Read more