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TransactionManagementError “You can't execute queries until the end of the 'atomic' block” while usi
...e database. pytest-django also supports this style of tests, which you can select using an argument to the django_db mark:
@pytest.mark.django_db(transaction=True)
def test_spam():
pass # test relying on transactions
...
How do I sort strings alphabetically while accounting for value when a string is numeric?
..." };
var size = from x in sizes
orderby x.Length, x
select x;
foreach (var p in size)
{
Console.WriteLine(p);
}
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How to pass prepareForSegue: an object
...ntifier:sender: method to activate the transition to a new view based on a selection or button press.
For instance, consider I had two view controllers. The first contains three buttons and the second needs to know which of those buttons has been pressed before the transition. You could wire t...
Get path of executable
... the predefined OS macros detailed at predef.sourceforge.net/preos.html to select the method is straightforward.
– Clifford
Oct 7 '09 at 15:02
5
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Check if a class is derived from a generic class
...f (parent == cur || (isParameterLessGeneric && cur.GetInterfaces().Select(i => GetFullTypeDefinition(i)).Contains(GetFullTypeDefinition(parent))))
return true;
else if (!isParameterLessGeneric)
if (GetFullTypeDefinition(parent) == cur &&...
Why can't I initialize non-const static member or static array in class?
...e symbol if it is used in the translation unit and ensures the linker only selects and leaves one copy if it's defined in multiple translation units due to it being in a comdat group. const at file scope makes the compiler never emit a symbol because it's always substituted immediately in the code u...
Can I hex edit a file in Visual Studio?
...
Menu File → Open → File
Select the file to be opened
On the open file dialog at the bottom there is a down arrow on the "Open" button
Click "Open With..."
Click "Binary Editor"
Click OK
Or for the keyboard geeks out there:
Ctrl + o
Ctrl + v (pas...
Converting a Uniform Distribution to a Normal Distribution
...
You can use the PDF if you're prepared to randomly select a direction relative to the mean; do I understand that right?
– Mark McKenna
Sep 28 '14 at 21:43
2...
List distinct values in a vector in R
...
You can also use the sqldf package in R.
Z <- sqldf('SELECT DISTINCT tablename.columnname FROM tablename ')
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How do I escape a percentage sign in T-SQL?
... '!' (or your character of choice) to the end of the query.
For example:
SELECT *
FROM prices
WHERE discount LIKE '%80!% off%'
ESCAPE '!'
This will make the database treat 80% as an actual part of the string to search for and not 80(wildcard).
MSDN Docs for LIKE
...