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How to drop a table if it exists?
...ver 2016+ has a better way, using DROP TABLE IF EXISTS …. See the answer by @Jovan.
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Add space between HTML elements only using CSS
... it is this:
span + span {
margin-left: 10px;
}
Every span preceded by a span (so, every span except the first) will have margin-left: 10px.
Here's a more detailed answer to a similar question: Separators between elements without hacks
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How to join two sets in one line without using “|”
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If by join you mean union, try this:
set(list(s) + list(t))
It's a bit of a hack, but I can't think of a better one liner to do it.
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How do I get the collection of Model State Errors in ASP.NET MVC?
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Because we start by iterating over this.ModelState.Keys, I don't see the potential for a KeyNotFoundException. I think that check would be overkill.
– Chris McKenzie
Nov 6 '12 at 22:09
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WCF ServiceHost access rights
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The issue is that the URL is being blocked from being created by Windows.
Steps to fix:
Run command prompt as an administrator.
Add the URL to the ACL
netsh http add urlacl url=http://+:8000/ServiceModelSamples/Service user=mylocaluser
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How to select multiple files with ?
...cification).
Browser support is quite good on desktop (just not supported by IE 9 and prior), less good on mobile, I guess because it's harder to implement correctly depending on the platform and version.
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Gradle store on local file system
...cache location depends on the GRADLE_USER_HOME environment variable value.
By default, it is $USER_HOME/.gradle on Unix-OS based and %userprofile%.\gradle on Windows.
But if you set this variable, the cache directory would be located from this path.
And whatever the case, you should dig into caches...
Android dismiss keyboard
...er way in the future to do such a simple thing.
– Subby
May 20 '15 at 11:01
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How can I remove all objects but one from the workspace in R?
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Here is a simple construct that will do it, by using setdiff:
rm(list=setdiff(ls(), "x"))
And a full example. Run this at your own risk - it will remove all variables except x:
x <- 1
y <- 2
z <- 3
ls()
[1] "x" "y" "z"
rm(list=setdiff(ls(), "x"))
ls()
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How do I paste multi-line bash codes into terminal and run it all at once?
... echo Hello!
}
hello
You can paste and verify in a terminal using bash by:
Starting with (
Pasting your text, and pressing Enter (to make it pretty)... or not
Ending with a ) and pressing Enter
Example:
imac:~ home$ ( function hello {
> echo Hello!
> }
> hello
> )
Hello!
im...