大约有 31,840 项符合查询结果（耗时：0.0473秒） [XML]
How to create empty text file from a batch file?
...
To merge ephemient's answer and this one, you could do: "echo. >NUL 2>EmptyFile.txt" to achieve the same results without outputting a newline
– cmptrgeekken
Oct 25 '09 at 15:34
...
How can I run an external command asynchronously from Python?
...
Cdleary is absolutely correct, it should be mentioned that communicate and wait do block, so only do it when you are waiting for things to shut down. (Which you should really do to be well-behaved)
– Ali Afshar
Mar 11 '09 at 22:29
...
How to break out from a ruby block?
...is in a loop without terminating the loop. To do that, I made the block a one-iteration loop:
for b in 1..2 do
puts b
begin
puts 'want this to run'
break
puts 'but not this'
end while false
puts 'also want this to run'
end
Hope this helps the next googler ...
MySQL case insensitive select
Can anyone tell me if a MySQL SELECT query is case sensitive or case insensitive by default? And if not, what query would I have to send so that I can do something like:
...
MySql Table Insert if not exist otherwise update
...ERT ... ON DUPLICATE KEY UPDATE on tables against a table having more than one unique or primary key. Taken from MySQL documentation: In addition, beginning with MySQL 5.5.24, an INSERT ... ON DUPLICATE KEY UPDATE statement against a table having more than one unique or primary key is also marked a...
Should struct definitions go in .h or .c file?
... of struct s in headers and just declarations—is there any advantage to one method over the other?
6 Answers
...
javax vs java package
...: While an official explanation (the search orbfish suggested didn't yield one in the first page or so) is no doubt about "core" vs "extension", I still suspect that in many cases the decision for any particular package has an historical reason behind it too. Is java.beans really that "core" to Java...
Random string generation with upper case letters and digits
...
Answer in one line:
''.join(random.choice(string.ascii_uppercase + string.digits) for _ in range(N))
or even shorter starting with Python 3.6 using random.choices():
''.join(random.choices(string.ascii_uppercase + string.digits, k=...
What does Expression.Quote() do that Expression.Constant() can’t already do?
...resentation for two very different things is extremely confusing and bug prone.
Long answer:
Consider the following:
(int s)=>(int t)=>s+t
The outer lambda is a factory for adders that are bound to the outer lambda's parameter.
Now, suppose we wish to represent this as an expression tre...
What C++ Smart Pointer Implementations are available?
...
C++03
std::auto_ptr - Perhaps one of the originals it suffered from first draft syndrome only providing limited garbage collection facilities. The first downside being that it calls delete upon destruction making them unacceptable for holding array alloca...