大约有 47,000 项符合查询结果（耗时：0.0462秒） [XML]
How to UPSERT (MERGE, INSERT … ON DUPLICATE UPDATE) in PostgreSQL?
...o do an upsert, which is what MySQL calls INSERT ... ON DUPLICATE UPDATE and the standard supports as part of the MERGE operation.
...
How do i create an InstallShield LE project to install a windows service?
...mited Edition). The problem here is that I write a ton of Windows Services and I can't see how to setup InstallShield LE. It appears that we (my company) will have to invest in licenses for the professional edition.
...
Difference between jar and war in Java
What is the difference between a .jar and a .war file?
Is it only the file extension or is there something more?
13 A...
What are C++ functors and their uses?
...about functors in C++. Can someone give me an overview as to what they are and in what cases they would be useful?
14 Answe...
Why doesn't .NET/C# optimize for tail-call recursion?
...ugh analysis to keep the application competitive in the long term with a standard ahead-of-time compilation.
Interestingly the NGen compilation steps are not targeted to being more aggressive in their optimizations. I suspect this is because they simply don't want to have bugs where the behaviour i...
What is the difference between Serialization and Marshaling?
...d techniques (such as RPC), the term "Marshaling" is used but don't understand how it differs from Serialization. Aren't they both transforming objects into series of bits?
...
What is HTML5 ARIA?
What is HTML5 ARIA? I do not understand how to implement it.
5 Answers
5
...
Keep-alive header clarification
I was asked to build a site , and one of the co-developer told me That I would need to include the keep-alive header.
1 An...
Volatile vs. Interlocked vs. lock
...he point of volatile is that multiple threads running on multiple CPUs can and will cache data and re-order instructions.
If it is not volatile, and CPU A increments a value, then CPU B may not actually see that incremented value until some time later, which may cause problems.
If it is volatile, th...
What is 'Currying'?
I've seen references to curried functions in several articles and blogs but I can't find a good explanation (or at least one that makes sense!)
...