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What is the difference between save and insert in Mongo DB?

... Save Vs Insert : In your given examples, the behavior is essentially the same. save behaves differently if it is passed with an "_id" parameter. For save, If the document contains _id, it will upsert querying the collection on the _id field, If not, it will insert. If a document does not...
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What is the effect of extern “C” in C++?

...very compiler is required to provide "C" linkage A linkage specification shall occur only in namespace scope All function types, function names and variable names have a language linkage See Richard's Comment: Only function names and variable names with external linkage have a language linkage Two ...
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How can I change Mac OS's default Java VM returned from /usr/libexec/java_home

...'`" But standard double-clickable application bundles don't use JDKs installed under /Library/Java at all. Old-style .app bundles using Apple's JavaApplicationStub will use Apple Java 6 from /System/Library/Frameworks, and new-style ones built with AppBundler without a bundled JRE will use the "p...
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What is __init__.py for?

...kages as they existed in Python 3.2 and earlier. A regular package is typically implemented as a directory containing an __init__.py file. When a regular package is imported, this __init__.py file is implicitly executed, and the objects it defines are bound to names in the package’s namespace. The...
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django urls without a trailing slash do not redirect

...ost.". "The APPEND_SLASH setting is only used if CommonMiddleware is installed...". I prefer Michael Gendin's answer for a cleaner solution. – Wtower Feb 11 '15 at 9:26 ...
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What is the best practice for “Copy Local” and with project references?

...=================== GetCopyToOutputDirectoryItems Get all project items that may need to be transferred to the output directory. ============================================================ --> <Target Name="GetCopyToOutputDirectoryItems" Outputs="@(AllItemsFullPat...
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How do I calculate the date in JavaScript three months prior to today?

...ch 31st the same day as one month before March 28th, 3 days earlier? This all depends on what you mean by "one month before". Go have a conversation with your product owner. If you want to do like momentjs does, and correct these last day of the month errors by moving to the last day of the month...
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Dynamically load JS inside JS [duplicate]

...se my own implementation of it like: jQuery.loadScript = function (url, callback) { jQuery.ajax({ url: url, dataType: 'script', success: callback, async: true }); } and use it like: if (typeof someObject == 'undefined') $.loadScript('url_to_someScript.js...
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Mock vs MagicMock

My understanding is that MagicMock is a superset of Mock that automatically does "magic methods" thus seamlessly providing support for lists, iterations and so on... Then what is the reason for plain Mock existing? Isn't that just a stripped down version of MagicMock that can be practically ...
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C++ 读写xml方法整理(持续更新) - C/C++ - 清泛网 - 专注C/C++及内核技术

...******************* * outline.c * * Copyright 1999, Clark Cooper * All rights reserved. */ #include <stdio.h> #include <expat.h> #if defined(__amigaos__) && defined(__USE_INLINE__) #include <proto/expat.h> #endif #ifdef XML_LARGE_SIZE #if defined(XML_USE_MSC_EXTENSIONS) && _MS...