大约有 15,600 项符合查询结果（耗时：0.0269秒） [XML]
Update or Insert (multiple rows and columns) from subquery in PostgreSQL
...p; Insert so that if one fails, the other will be used without throwing an error (independently for each row). I think that would be a more complete solution to the question (for example: stackoverflow.com/a/6527838/781695)
– user
Dec 24 '14 at 5:08
...
how to get first three characters of an NSString?
...
note: "Range or index out of bounds" error possible if you don't check the length to make sure it has 3 or more characters long
– Ryan Bavetta
Mar 29 '12 at 4:01
...
How to increase font size in the Xcode editor?
...ects you have open in Xcode"? I don't know if it's expected behavior or my error, however in Xcode Version 5.1 (5B130a), I can't change fonts if there are any projects currently open.
– original_username
Mar 17 '14 at 9:07
...
How to change MySQL data directory?
...e' and 'journalctl -xn' for details when trying to restart mysqld, and the error is that the disk is full. It's got 500GB of free space...
– Frank H.
Mar 13 '17 at 22:03
...
How to format a JavaScript date
...use the current locale, passing null for the first parameter will cause an error. Use undefined instead.
For different languages:
"en-US": For English
"hi-IN": For Hindi
"ja-JP": For Japanese
You can use more language options.
For example
var options = { weekday: 'long', year: 'numeric',...
CSS selector with period in ID
...
This may work in some browsers, but I have seen errors thrown for attribute selectors as well. You can still escape the ., as \. though.
– Chris Jaynes
Jan 20 '15 at 15:02
...
What does “Protocol … can only be used as a generic constraint because it has Self or associated typ
... a HashSet ) keyed on a custom protocol in Swift, but it is giving me the error in the title:
2 Answers
...
What is the difference between quiet NaN and signaling NaN?
...e exit status:
g++ -ggdb3 -O0 -Wall -Wextra -pthread -std=c++11 -pedantic-errors -o blow_up.out blow_up.cpp -lm -lrt
./blow_up.out
echo $?
Output:
FE_ALL_EXCEPT snan + 1.0f
feenableexcept qnan + 1.0f
Floating point exception (core dumped)
136
Note that this behaviour only happens with -O0 in G...
String formatting: % vs. .format vs. string literal
...ere %s" % name
yet, if name happens to be (1, 2, 3), it will throw a TypeError. To guarantee that it always prints, you'd need to do
"hi there %s" % (name,) # supply the single argument as a single-item tuple
which is just ugly. .format doesn't have those issues. Also in the second example yo...
How to assign the output of a command to a Makefile variable
...to the Makefile, will you get this? Probably not. You will probably get an error like what is reported here:
makefile:4: *** missing separator. Stop
Why: Because although I personally used a genuine tab, Stack Overflow (attempting to be helpful) converts my tab into a number of spaces. You, frustr...