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Print number of keys in Redis
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DBSIZE returns the number of keys and it's easier to parse.
Downside: if a key has expired it may still count.
http://redis.io/commands/dbsize
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RESTfully design /login or /register resources?
...o think about how my api should be designed as a RESTful web service. For now, most of my URI's are generic and might apply to various web apps:
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In C, do braces act as a stack frame?
If I create a variable within a new set of curly braces, is that variable popped off the stack on the closing brace, or does it hang out until the end of the function? For example:
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How can I check if a background image is loaded?
...on't think there's such a thing as browser memory where assets are stored. If you're referring to cache, remember that you're adding an extra HTTP request and all clients might not have cache enabled.
– HyderA
Feb 20 '11 at 17:09
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“for loop” with two variables? [duplicate]
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If you want the effect of a nested for loop, use:
import itertools
for i, j in itertools.product(range(x), range(y)):
# Stuff...
If you just want to loop simultaneously, use:
for i, j in zip(range(x), range(y)):
#...
Change the font of a UIBarButtonItem
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Fantastic! My app is looking beautiful now (well, in my own way that is!! :P) Thank you
– Septronic
Nov 3 '15 at 23:29
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Adding :default => true to boolean in existing Rails column
...of ActiveRecord::Migration, so you can't call it like that in the console.
If you want to add a default value for this column, create a new migration:
rails g migration add_default_value_to_show_attribute
Then in the migration created:
# That's the more generic way to change a column
def up
change...
C# 通过代码安装、卸载、启动、停止服务 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...ceName);
string dispName = string.Empty;
if (!ServiceIsExisted(serviceName, ref dispName))
{
// Install Service
AssemblyInstaller myAssemblyInstaller = new AssemblyInstaller();
myAssembl...
How do I create a custom iOS view class and instantiate multiple copies of it (in IB)?
...revision history)
I'm not very familiar at all with storyboard, but I do know that you can construct your interface in IB using a .xib file which is nearly identical to using the storyboard version; You should even be able to copy & paste your views as a whole from your existing interface to th...
How to UPSERT (MERGE, INSERT … ON DUPLICATE UPDATE) in PostgreSQL?
...ou're on 9.5 and don't need to be backward-compatible you can stop reading now.
9.4 and older:
PostgreSQL doesn't have any built-in UPSERT (or MERGE) facility, and doing it efficiently in the face of concurrent use is very difficult.
This article discusses the problem in useful detail.
In general y...