大约有 48,000 项符合查询结果(耗时:0.0705秒) [XML]

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What is the difference between a stored procedure and a view?

...O Thus, if I want to query profile_description by user_id in the future, all I have to do is: SELECT profile_description FROM vw_user_profile WHERE user_id = @ID That code could be used in a stored procedure like: CREATE PROCEDURE dbo.getDesc @ID int AS BEGIN SELECT profile_description...
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How to find whether or not a variable is empty in Bash

...variable is undefined and the set -u option (nounset) is activated. Almost all other answers to this question will fail with unbound variable in this case. – anol May 26 '15 at 16:29 ...
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Invoke(Delegate)

...und to a specific thread and are not thread safe. Therefore, if you are calling a control's method from a different thread, you must use one of the control's invoke methods to marshal the call to the proper thread. This property can be used to determine if you must call an invoke method, whi...
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Setting log level of message at runtime in slf4j

...j that can be efficiently mapped to the Level (or equivalent) type used in all of the possible logging implementations behind the facade. Alternatively, the designers decided that your use-case is too unusual to justify the overheads of supporting it. Concerning @ripper234's use-case (unit testing...
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How does `is_base_of` work?

... If they are related Let's for a moment assume that B is actually a base of D. Then for the call to check, both versions are viable because Host can be converted to D* and B*. It's a user defined conversion sequence as described by 13.3.3.1.2 from Host<B, D> to D* and B* respecti...
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What is wrong with using goto? [duplicate]

...lso read some negative texts about them some years ago): What is actually wrong with it? Why are goto's even possible in C++ then? ...
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Is there a difference between copy initialization and direct initialization?

... expression is initialized to (loosely speaking) in C++17. These objects (called "result objects") are the variables created by a declaration (like a1), artificial objects created when the initialization ends up being discarded, or if an object is needed for reference binding (like, in A_factory_fun...
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Peak signal detection in realtime timeseries data

...andard deviations away from some moving mean, the algorithm signals (also called z-score). The algorithm is very robust because it constructs a separate moving mean and deviation, such that signals do not corrupt the threshold. Future signals are therefore identified with approximately the same accu...
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jquery - return value using ajax result on success

I have a small problem with jquery $.ajax() function. 9 Answers 9 ...
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Benchmarking small code samples in C#, can this implementation be improved?

Quite often on SO I find myself benchmarking small chunks of code to see which implemnetation is fastest. 11 Answers ...