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Rails DB Migration - How To Drop a Table?
I added a table that I thought I was going to need, but now no longer plan on using it. How should I remove that table?
22 ...
How to calculate the CPU usage of a process by PID in Linux from C?
...oc/stat. Then sleep for a second or so, and read them all again. You can now calculate the CPU usage of the process over the sampling time, with:
user_util = 100 * (utime_after - utime_before) / (time_total_after - time_total_before);
sys_util = 100 * (stime_after - stime_before) / (time_total_af...
What text editor is available in Heroku bash shell? [closed]
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Perfect. Now I can edit configs as needed
– Felipe
Jan 20 '18 at 4:56
4
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How to perform static code analysis in php? [closed]
... are reported like
rjha@mint ~ $ ~/sw/pfff/scheck ~/code/github/sc/
login-now.php:7:4: CHECK: Unused Local variable $title
go-automatic.php:14:77: CHECK: Use of undeclared variable $goUrl.
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How many and which are the uses of “const” in C++?
...ect remain the same. Once one of the object changes data, you however need now two versions: One for the original, and one for the copy. That is, you copy on a write to either object, so that they now both have their own version.
Using code:
int main() {
string const a = "1234";
string co...
Are there legitimate uses for JavaScript's “with” statement?
...e feature, and had never given much thought to how it might cause trouble. Now, I'm curious as to how I might make effective use of with , while avoiding its pitfalls.
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Make Vim show ALL white spaces as a character
...l, in combination with
:set listchars=...
display invisible characters.
Now, there isn't an explicit option which you can use to show whitespace, but in listchars, you could set a character to show for everything BUT whitespace. For example, mine looks like this
:set listchars=eol:$,tab:>-,tr...
Error installing mysql2: Failed to build gem native extension
...with-mysql-include="c:\Program Files\MySQL\MySQL Server 5.5\include"'
Now the gem should have installed correctly
Lastly copy the libmysql.dll file from
C:\Program Files\MySQL\MySQL Server 5.5\lib
to
C:\Rails\Ruby1.9.2\bin
--- Install the mysql2 Gem ---
You will now be able to u...
Aren't Python strings immutable? Then why does a + “ ” + b work?
...able, a, which points to the string, is mutable.
Consider:
a = "Foo"
# a now points to "Foo"
b = a
# b points to the same "Foo" that a points to
a = a + a
# a points to the new string "FooFoo", but b still points to the old "Foo"
print a
print b
# Outputs:
# FooFoo
# Foo
# Observe that b hasn't...
What's the purpose of git-mv?
... in parallel. At some point if we want to merge the projects how will git know that it's the same file just renamed it's path? (if "git mv" == "git add + git rm")
– Rose
Dec 27 '12 at 0:22
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