大约有 11,295 项符合查询结果（耗时：0.0279秒） [XML]
IN vs OR in the SQL WHERE Clause
When dealing with big databases, which performs better, IN or OR in the SQL Where -clause?
6 Answers
...
Why can't I forward-declare a class in a namespace using double colons?
...
Because you can't. In C++ language fully-qualified names are only used to refer to existing (i.e. previously declared) entities. They can't be used to introduce new entities.
And you are in fact "reopening" the namespace to ...
JavaScript dependency management: npm vs. bower vs. volo [closed]
How do you compare npm , bower and volo ?
5 Answers
5
...
Is it expensive to use try-catch blocks even if an exception is never thrown?
We know that it is expensive to catch exceptions. But, is it also expensive to use a try-catch block in Java even if an exception is never thrown?
...
What are C++ functors and their uses?
I keep hearing a lot about functors in C++. Can someone give me an overview as to what they are and in what cases they would be useful?
...
Java SE 6 vs. JRE 1.6 vs. JDK 1.6 - What do these mean?
...
When you type "java -version", you see three version numbers - the java version (on mine, that's "1.6.0_07"), the Java SE Runtime Environment version ("build 1.6.0_07-b06"), and the HotSpot version (on mine, that's "build 10.0-b23, mixed mode"). I suspect the "11.0" you are seein...
Java String split removed empty values
I am trying to split the Value using a separator.
But I am finding the surprising results
5 Answers
...
What's the difference between findAndModify and update in MongoDB?
I'm a little bit confused by the findAndModify method in MongoDB. What's the advantage of it over the update method? For me, it seems that it just returns the item first and then updates it. But why do I need to return the item first? I read the MongoDB: the definitive guide and it says that i...
How to make the 'cut' command treat same sequental delimiters as one?
I'm trying to extract a certain (the fourth) field from the column-based, 'space'-adjusted text stream. I'm trying to use the cut command in the following manner:
...
Verifying signed git commits?
With newer versions of git it's possible to sign individual commits (in addition to tags) with a PGP key:
3 Answers
...