大约有 44,000 项符合查询结果（耗时：0.0720秒） [XML]
NULL values inside NOT IN clause
This issue came up when I got different records counts for what I thought were identical queries one using a not in where constraint and the other a left join . The table in the not in constraint had one null value (bad data) which caused that query to return a count of 0 records. I sort of u...
Regular expression to match any character being repeated more than 10 times
...he same character being repeated more than 10 or so times. So for example, if I have a document littered with horizontal lines:
...
How to set the first option on a select box using jQuery?
...
If you use this from a <button> element, be sure to do not set type="reset". It didn't work for me until I set type to button
– Caumons
Sep 14 '13 at 2:04
...
Can “this” ever be null in Java?
...
No it can't. If you're using this, then you're in the instance so this isn't null.
The JLS says :
When used as a primary expression, the keyword this denotes a value that is a reference to the object for which the instance method wa...
Cycles in family tree software
...tal misunderstanding of what a family tree is supposed to be.
Let me clarify, I also work for a company that has (as one of its products) a family tree in its portfolio, and we have been struggling with similar problems.
The problem, in our case, and I assume your case as well, comes from the GED...
What does the restrict keyword mean in C++?
...A hint only, so may do nothing and still be conforming
A restrict-qualified pointer (or reference)...
! ...is basically a
promise to the compiler that for the
scope of the pointer, the target of the pointer will only
be accessed through that pointer (and pointers copied...
Is it possible to decrypt MD5 hashes?
...e value. The thing that makes hashes interesting is that it is incredibly difficult to find two pieces of data that hash to the same value, and the chances of it happening by accident are almost 0.
A simple example for a (very insecure) hash function (and this illustrates the general idea of it bei...
How to implement the factory method pattern in C++ correctly
...ere are cases when
object construction is a task complex
enough to justify its extraction to
another class.
I believe this point is incorrect. The complexity doesn't really matter. The relevance is what does. If an object can be constructed in one step (not like in the builder pattern), the ...
WPF global exception handler [duplicate]
...
Bad idea if you create multiple instances of the window...
– Thomas Levesque
Sep 24 '09 at 15:50
1
...
How to correctly dismiss a DialogFragment?
...tself:
public void dismiss()
Dismiss the fragment and its dialog. If the fragment was added to the back stack, all back stack state up to and including this entry will be popped. Otherwise, a new transaction will be committed to remove the fragment.
As you can see, this takes care not onl...