大约有 32,000 项符合查询结果（耗时：0.0292秒） [XML]
How to select from subquery using Laravel Query Builder?
...y there is no method to create subquery in FROM clause, so you need to manually use raw statement, then, if necessary, you will merge all the bindings:
$sub = Abc::where(..)->groupBy(..); // Eloquent Builder instance
$count = DB::table( DB::raw("({$sub->toSql()}) as sub") )
->mergeBin...
How do I use a file grep comparison inside a bash if/else statement?
...tus is 0 if any line was selected, 1 otherwise;
if any error occurs and -q was not given, the exit status is 2.
if grep --quiet MYSQL_ROLE=master /etc/aws/hosts.conf; then
echo exists
else
echo not found
fi
You may want to use a more specific regex, such as ^MYSQL_ROLE=master$, to avoid th...
Reading value from console, interactively
...locking on input, something node.js doesn't like to do.
Instead set up a callback to be called each time something is entered:
var stdin = process.openStdin();
stdin.addListener("data", function(d) {
// note: d is an object, and when converted to a string it will
// end with a linefeed. ...
What is the difference between static_cast and C style casting?
...runtime.
Also, c++ style casts can be searched for easily, whereas it's really hard to search for c style casts.
Another big benefit is that the 4 different C++ style casts express the intent of the programmer more clearly.
When writing C++ I'd pretty much always use the C++ ones over the the C...
Insert a line at specific line number with sed or awk
...
mac users: with homebrew, brew install gnu-sed and then use this with gsed
– cwd
Jan 10 '15 at 17:58
4
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Programmatically access currency exchange rates [closed]
... this, is there any information on what the parameters stand for? Specifically the "f" parameter. I can't find any info anywhere.
– Fishcake
Oct 8 '09 at 6:12
9
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Regular Expressions: Is there an AND operator?
...
It should be mentioned that this particular example is called a positive lookahead assertion. It has other uses than "and". Note that the text isn't consumed.
– strager
Jan 22 '09 at 21:11
...
How to get the first non-null value in Java?
... the efficiency reasons that i mentioned above is that an array allocation will happen each time you invoke the var arg version of the method. this could be wasteful for hand-fulls of items, which i suspect will be common usage.
– les2
May 4 '10 at 1...
tinyxml XML解析库下载（tinyxml2.h 和 tinyxml2.cpp） - 源码下载 - 清泛...
...>
# include <cstdarg>
#endif
/*
TODO: intern strings instead of allocation.
*/
/*
gcc:
g++ -Wall -DDEBUG tinyxml2.cpp xmltest.cpp -o gccxmltest.exe
Formatting, Artistic Style:
AStyle.exe --style=1tbs --indent-switches --break-closing-brackets --indent-preproce...
How to mkdir only if a directory does not already exist?
...is used for both files / directories and just checks existence. Also, they all return 0 upon success, so ! is redundant. Correct me if I'm wrong.
– alkar
Apr 27 '09 at 14:57
1
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