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Efficient SQL test query or validation query that will work across all (or most) databases
...himpsky)
PostgreSQL
SQLite
SELECT 1 FROM DUAL
Oracle
SELECT 1 FROM any_existing_table WHERE 1=0
or
SELECT 1 FROM INFORMATION_SCHEMA.SYSTEM_USERS
or
CALL NOW()
HSQLDB (tested with version 1.8.0.10)
Note: I tried using a WHERE 1=0 clause on the second query, but it didn't work as a value for Ap...
How do I position one image on top of another in HTML?
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@Me_developer You wouldn't do it this way. You'd use auto margins. w3schools.com/howto/howto_css_image_center.asp
– Craigo
Jan 23 at 8:47
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Send and receive messages through NSNotificationCenter in Objective-C?
...your view, don't forget to send it from the main thread by calling dispatch_async:
dispatch_async(dispatch_get_main_queue(),^{
[[NSNotificationCenter defaultCenter] postNotificationName:@"my_notification" object:nil];
});
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Can PNG image transparency be preserved when using PHP's GDlib imagecopyresampled?
...ay, but did achieve my needs at the time.
$uploadTempFile = $myField[ 'tmp_name' ]
list( $uploadWidth, $uploadHeight, $uploadType )
= getimagesize( $uploadTempFile );
$srcImage = imagecreatefrompng( $uploadTempFile );
$targetImage = imagecreatetruecolor( 128, 128 );
imagealphablending( $ta...
How to spyOn a value property (rather than a method) with Jasmine
... is just what they were asking and their very same question code snippet ¯_(ツ)_/¯ The point of their question was how to spy on a property and not so much their specific example.
– Juan
Apr 3 at 23:34
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PostgreSQL database default location on Linux
...untu 14.04 by default.
You can find postgresql.conf and look at param data_directory. If it is commented then database directory is the same as this config file directory.
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make an html svg object also a clickable link
...c14bd68a4b06a6
Found via comment 20 here https://bugzilla.mozilla.org/show_bug.cgi?id=294932
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Haskell Type vs Data Constructor
... totally different. So you might do something like this:
data Config = XML_Config {...} | JSON_Config {...}
(With some suitable fields in there, obviously.) You can't do stuff like this in normal programming languages, which is why most people aren't used to it.
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How to change the URI (URL) for a remote Git repository?
...accept the consequences if you get it wrong. Backup your local repository _before_ messing with git internals.
– Jesse Chisholm
Oct 20 '16 at 15:41
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Using link_to with embedded HTML
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Two ways. Either:
<%= link_to user_path(@user) do %>
<i class="icon-ok icon-white"></i> Do it@
<% end %>
Or:
<%= link_to '<i class="icon-ok icon-white"></i> Do it@'.html_safe, user_path(@user) %>
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