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How to sum array of numbers in Ruby?
... using array.map(...).inject(...) is inefficient, you will iterate through all data twice. Try array.inject(0) { |sum, product| sum += product.price }
– everett1992
Apr 4 '13 at 6:11
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Convert timestamp to readable date/time PHP
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Use PHP's date() function.
Example:
echo date('m/d/Y', 1299446702);
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How to know what the 'errno' means?
When calling execl(...) , I get an errno=2 . What does it mean? How can I know the meaning of this errno ?
15 Answers
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Determine which MySQL configuration file is being used
...inux, then start the 'mysqld' with strace, for eg strace ./mysqld.
Among all the other system calls, you will find something like:
stat64("/etc/my.cnf", 0xbfa3d7fc) = -1 ENOENT (No such file or directory)
stat64("/etc/mysql/my.cnf", {st_mode=S_IFREG|0644, st_size=4227, ...}) = 0
open("/etc/...
Postgresql not creating db with “createdb” as superuser, yet not outputting errors [duplicate]
I am working with a fresh postgresql install, with 'postgres' super user. Logged in via:
5 Answers
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MySQL search and replace some text in a field
... @inemanja, @Air without the WHERE clause you do an UPDATE on all the rows...
– Alexis Wilke
Jun 25 '15 at 3:37
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Trying to add adb to PATH variable OSX
.../bin:/bin:/usr/sbin:/sbin:/usr/local/bin:/usr/X11/bin:/Libs/android-sdk-mac_x86/tools:/Libs/android-sdk-mac_x86/platform-tools
You're missing the /Users/simon part.
Also note that if you have both .profile and .bash_profile files, only the latter gets executed.
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How do you configure logging in Hibernate 4 to use SLF4J
...is classloader can't find the target
// log classes, then it doesn't really matter if they're possibly available from the TCCL because we won't be
// able to find it anyway
final ClassLoader cl = LoggerProviders.class.getClassLoader();
try {
// Check the system property
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MySql : Grant read only options?
I have a user, whom I want to grant all the READ permission on a db schema.
7 Answers
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How to get nice formatting in the Rails console
...he y method is a handy way to get some pretty YAML output.
y ProductColor.all
Assuming you are in script/console
As jordanpg commented, this answer is outdated. For Rails 3.2+ you need to execute the following code before you can get the y method to work:
YAML::ENGINE.yamler = 'syck'
From rub...