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How do you create a random string that's suitable for a session ID in PostgreSQL?
...fficient way to choose from 62 characters each time? How does this perform compared to md5()?
– ma11hew28
Feb 10 '14 at 1:58
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“implements Runnable” vs “extends Thread” in Java
...he thread's behaviour. You're just giving it something to run. That means composition is the philosophically "purer" way to go.
In practical terms, it means you can implement Runnable and extend from another class as well.
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How do you 'redo' changes after 'undo' with Emacs?
...Short version: by undoing the undo. If you undo, and then do a non-editing command such as C-f, then the next undo will undo the undo, resulting in a redo.
Longer version:
You can think of undo as operating on a stack of operations. If you perform some command (even a navigation command such as C-...
Combining two expressions (Expression)
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Well, you can use Expression.AndAlso / OrElse etc to combine logical expressions, but the problem is the parameters; are you working with the same ParameterExpression in expr1 and expr2? If so, it is easier:
var body = Expression.AndAlso(expr1.Body, expr2.Body);
var lambda = E...
UnboundLocalError on local variable when reassigned after first use
...tion, it is treated by default as a local variable. Therefore, when you uncomment the line you are trying to reference the local variable c before any value has been assigned to it.
If you want the variable c to refer to the global c = 3 assigned before the function, put
global c
as the first l...
PHP Regex to check date is in YYYY-MM-DD format
...t worked for the person who asked, read this beautiful tour: stackoverflow.com/tour .
– stramin
Feb 8 '17 at 12:56
@Gr...
MySQL: multiple tables or one table with many columns?
...e amount of work the database needs to do when reading data). I'd highly recommend making your data as normalized as possible to start out, and only denormalize if you're aware of performance problems in specific queries.
sh...
Mapping two integers to one, in a unique and deterministic way
Imagine two positive integers A and B. I want to combine these two into a single integer C.
18 Answers
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What exactly are unmanaged resources?
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Open Database connection comes under which category? Managed / Unmanaged?
– Deviprasad Das
Aug 8 '10 at 5:38
8
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Only detect click event on pseudo-element
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