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MySQL: Set user variable from result of query
...Without using keyword 'SET' and using ':='.
Example:-
mysql > @a:=1;
By using 'SELECT' statement.
Example:-
mysql > select 1 into @a;
Here @a is user defined variable and 1 is going to be assigned in @a.
Now how to get or select the value of @{variable_name}.
we can use select statement l...
Is effective C++ still effective?
...only code. The Effective C++ is still very relevant, and is not superseded by the new book. Buy it, read it, enjoy :)
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Is there any difference between “foo is None” and “foo == None”?
... it compares the same object instance
Whereas == is ultimately determined by the __eq__() method
i.e.
>>> class Foo(object):
def __eq__(self, other):
return True
>>> f = Foo()
>>> f == None
True
>>> f is None
False
...
Python TypeError: not enough arguments for format string
... for the logging module as well? Is this kind of interpolation understood by it?
– AllTradesJack
Aug 20 '14 at 18:35
...
“unary operator expected” error in Bash if condition
...unts to two processes ("[" is actually a program) instead of one.
It goes by this syntax: ${VARIABLE:-default}.
The whole thing has to be thought in such a way that this "default" value is something distinct from a "valid" value/content.
If that's not possible for some reason you probably need to...
Escape double quotes in a string
...he extra " characters are part of the string literal; they are interpreted by the compiler as a single ".
The actual value of your string is still He said to me , "Hello World".How are you ?, as you'll see if you print it at runtime.
...
How do I select the parent form based on which submit button is clicked?
...e submit event of the form itself, as it will trigger even when submitting by pressing the enter key from one of the fields:
$('form#myform1').submit(function(e){
e.preventDefault(); //Prevent the normal submission action
var form = this;
// ... Handle form submission
});
To select...
Difference between C++03 throw() specifier C++11 noexcept
...
std::unexpected() is called by the C++ runtime when a dynamic exception specification is violated: an exception is thrown from a function whose exception specification forbids exceptions of this type.
std::unexpected() may also be called directly from ...
What is a handle in C++?
...use it.
For instance, the HWND in the Win32 API is a handle for a Window. By itself it's useless: you can't glean any information from it. But pass it to the right API functions, and you can perform a wealth of different tricks with it. Internally you can think of the HWND as just an index into the...
Entity Framework Join 3 Tables
...D = e.EID
}).Take(10);
And you should probably add orderby clause, to make sure Top(10) returns correct top ten items.
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