大约有 31,100 项符合查询结果（耗时：0.0474秒） [XML]
What is more efficient? Using pow to square or just multiply it with itself?
...verload. In C++, it will be the roughly same. (Assuming the methodology in my testing is correct.)
This is in response to the comment made by An Markm:
Even if a using namespace std directive was issued, if the second parameter to pow is an int, then the std::pow(double, int) overload from <c...
How can I get “Copy to Output Directory” to work with Unit Tests?
...
RobV, you made my day. THANKS!
– Ignacio Soler Garcia
Feb 7 '12 at 17:07
2
...
How do I tell CPAN to install all dependencies?
...manent including automatic first-time CPAN configuration:
perl -MCPAN -e 'my $c = "CPAN::HandleConfig"; $c->load(doit => 1, autoconfig => 1); $c->edit(prerequisites_policy => "follow"); $c->edit(build_requires_install_policy => "yes"); $c->commit'
Or combine it with local:...
Windows equivalent to UNIX pwd
...cd says that when no path is given, it will change to your home directory. My local man pages use the wording: "Change the current directory to dir. if dir is not supplied, the value of the HOME shell variable is the default."
– Daniel Stevens
May 2 '19 at 10:0...
MySQL Workbench: How to keep the connection alive
Error Code: 2013. Lost connection to MySQL server during query
9 Answers
9
...
Child inside parent with min-height: 100% not inheriting height
...ely positioned, the value
computes to 'auto'.
If I put a min-height on my container, I'm not explicitly specifying its height - so my element should get an auto height. And that's exactly what Webkit - and all other browsers - do.
Second, the workaround I found:
If I set my container element t...
SQL command to display history of queries
I would like to display my executed sql command history in my MYSQL Query Browser. What is the sql statement for displaying history?
...
in a “using” block is a SqlConnection closed on return or exception?
...
Here is my Template. Everything you need to select data from an SQL server. Connection is closed and disposed and errors in connection and execution are caught.
string connString = System.Configuration.ConfigurationManager.Connectio...
How to redirect output with subprocess in Python?
...couraged, albeit still available in Python 3.
Use os.system:
os.system(my_cmd)
If you really want to use subprocess, here's the solution (mostly lifted from the documentation for subprocess):
p = subprocess.Popen(my_cmd, shell=True)
os.waitpid(p.pid, 0)
OTOH, you can avoid system calls enti...
What are the use cases for selecting CHAR over VARCHAR in SQL?
I realize that CHAR is recommended if all my values are fixed-width. But, so what? Why not just pick VARCHAR for all text fields just to be safe.
...