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Insert, on duplicate update in PostgreSQL?
...rying to prevent a natural and healthy DB behavior. I understand it better now.
– W.M.
Aug 8 '16 at 15:58
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show 3 more comments
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Creating an index on a table variable
...tax however SQL Server 2016 relaxes this a bit further. From CTP 3.1 it is now possible to declare filtered indexes for table variables. By RTM it may be the case that included columns are also allowed but the current position is that they "will likely not make it into SQL16 due to resource constrai...
What is the purpose of the -nodes argument in openssl?
...ay to use the encrypted key is to decrypt it first, for which you need to know the password it was encrypted with to generate the same key.
– indiv
Apr 12 '13 at 14:42
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Can't get rid of header X-Powered-By:Express
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// .. other headers here
next()
}
app.use( customHeaders );
// ... now your code goes here
Setting X-Powered by in this case would override the default 'Express', so you do not need to both disable AND set a new value.
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Best way to define error codes/strings in Java?
...g or whatever*/ id();
}
public interface IMessage {
ICode code();
}
Now you can define any number of enums which provide me
How to change a module variable from another module?
...till live in different namespaces: in __init__.py, they are bar.a and a).
Now, when you do
import bar
print bar.a
you are accessing variable bar/__init__.py:a (since import bar imports your bar/__init__.py). This is the variable you modify (to 1). You are not touching the contents of variable ...
How to generate a random int in C?
... bigger reason is that the properties of rand() and functions like it are known best for the use case where they are seeded exactly once per run, and not on every single call. Depending on "randomness" with untested or unproven properties leads to trouble.
– RBerteig
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Removing transforms in SVG files
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This extension has been updated and now it works for rects too, at least in my testing.
– sil
Dec 10 '19 at 22:51
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Python - When to use file vs open
...he moment. They've had a sort of strange relationship, but file() is going now, so there's no need to worry anymore.
The following is from the Python 2.6 docs. [bracket stuff] added by me.
When opening a file, it’s preferable to use open() instead of invoking this [file()] constructor directl...
Simple explanation of clojure protocols
...gt; eval(node.left) + eval(node.right)
NotOperator => !eval(node)
Now, if you want to add a new operation, say, type-checking, that's easy, but if you want to add a new node type, you have to modify all the existing pattern matching expressions in all operations.
And for typical naive OO, ...