大约有 40,700 项符合查询结果（耗时：0.0735秒） [XML]
Reading specific lines only
...read a file, but I only want to read specific lines, say line #26 and #30. Is there any built-in feature to achieve this?
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Fat models and skinny controllers sounds like creating God models [closed]
...skinny controllers approach, esp. the Rails camp. As a result the routers is basically just figuring out what method to call on what controller and all the controller method does is call the corresponding method on the model and then bring up the view. So I've two concerns here which I don't unders...
C++ Redefinition Header Files (winsock2.h)
How do I prevent from including header files twice? The problem is I'm including the in MyClass.h and then I'm including MyClass.h in many files, so it includes multiple times and redefinition error occurs. How to prevent?
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Cannot create an NSPersistentStoreCoordinator with a nil model
...xactly the same error message as the original post. I was wrestling with this for hours.
It was this line in my AppDelegate.m.
NSURL *modelURL = [[NSBundle mainBundle] URLForResource:@"[same with name of xcdatamodeld]" withExtension:@"momd"];
For anyone out there searching this error message and ...
Group query results by month and year in postgresql
... month.
extract(year from date) as yyyy : Postgresql's "extract" function is used to extract the YYYY year from the "date" attribute.
sum("Sales") as "Sales" : The SUM() function adds up all the "Sales" values, and supplies a case-sensitive alias, with the case sensitivity maintained by using doub...
How does #include work in C++? [duplicate]
...t if we add #include <bits/stdc++.h> in a C++ program then there is no need to include any other header files. How does #include <bits/stdc++.h> work and is it ok to use it instead of including individual header files?
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Check whether a path is valid
I am just wondering: I am looking for a way to validate if a given path is valid.
(Note: I do not want to check if a file is existing! I only want to proof the validity of the path - So if a file could possibly exists at the location) .
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MySQL and GROUP_CONCAT() maximum length
... rows into a single string.
However, the maximum length of the result of this function is 1024 characters.
7 Answers
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Efficiency of purely functional programming
Does anyone know what is the worst possible asymptotic slowdown that can happen when programming purely functionally as opposed to imperatively (i.e. allowing side-effects)?
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How can I pretty-print JSON in a shell script?
Is there a (Unix) shell script to format JSON in human-readable form?
55 Answers
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