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Counting null and non-null values in a single query
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@shannon I agree, COUNT(a) is a useful comment to add, but this does throw a warning/error depending on your stack and might warrant a comment in code. I would prefer the SUM method.
– Richard
Mar 29 '16 at 9:41
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Why would you use an ivar?
...easily via the accessors.
Performance
Yes, this can make a difference in some cases. Some programs have constraints where they can not use any objc messaging in certain parts of the program (think realtime). In other cases, you may want to access it directly for speed. In other cases, it's because o...
Eclipse IDE: How to zoom in on text?
I want the same behaviour Firefox has, when you use the scroll button in the mouse to zoom in and out on the current view.
Is there something like it for eclipse?
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Why is spawning threads in Java EE container discouraged?
One of the first things I've learned about Java EE development is that I shouldn't spawn my own threads inside a Java EE container. But when I come to think about it, I don't know the reason.
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Run a single migration file
...out IRB) which relies on the fact that require returns an array of class names:
script/runner 'require("db/migrate/20090408054532_add_foos.rb").first.constantize.up'
Note that if you do this, it probably won't update the schema_migrations table, but it seems like that's what you want anyway.
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What exactly can cause an “HIERARCHY_REQUEST_ERR: DOM Exception 3”-Error?
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It means you've tried to insert a DOM node into a place in the DOM tree where it cannot go. The most common place I see this is on Safari which doesn't allow the following:
document.appendChild(document.createElement('div'));
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Does a javascript if statement with multiple conditions test all of them?
In javascript, when using an if statement with multiple conditions to test for, does javascript test them all regardless, or will it bail before testing them all if it's already false?
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Is it possible to refresh a single UITableViewCell in a UITableView?
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Once you have the indexPath of your cell, you can do something like:
[self.tableView beginUpdates];
[self.tableView reloadRowsAtIndexPaths:[NSArray arrayWithObjects:indexPathOfYourCell, nil] withRowAnimation:UITableViewRowAnimationNone];
[self.tableView endUpdates];
In Xcode ...
Get spinner selected items text?
...nd the result is not what I need on the debuging mode I found the it gives me a value like {supliers=VITA}. but I only need the value "VITA" any ideas?
– Pedro Teran
Mar 1 '12 at 21:07
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Android: How to change the ActionBar “Home” Icon to be something other than the app icon?
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