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Two-way encryption: I need to store passwords that can be retrieved
...problem with this algorithm is that it could be easily broken by frequency analysis. However as generally passwords are not made from long paragraphs of English text I don't think you should worry about it. The second problem with XOR Cipher is that if you have a message in both encrypted and decryp...
How to create a unique index on a NULL column?
...
If you're using stored procedures on a table with a filtered index like that, make sure that ANSI_NULLS is ON, otherwise you'll get an error when trying to insert data.
– Arne
Oct 1 '12 at 7:35
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How to skip “Loose Object” popup when running 'git gui'
...see how to remove the code which shows up that dialog. I found the hint_gc procedure which does it and the place where it is called. At the same time I noticed that late 2011 there was added a configuration option for disabling the dialog. This change (part of git-gui 0.16.0) was merged to Git's mai...
Clang vs GCC - which produces faster binaries? [closed]
...h Microsoft's compiler for Windows. The tool, coan, is a preprocessor
and analyser of C/C++ source files and codelines of such: its
computational profile majors on recursive-descent parsing and file-handling.
The development branch (to which these results pertain)
comprises at present around 11K L...
Fast permutation -> number -> permutation mapping algorithms
...nspiring. I wonder it is the original work from the OP. i have studied and analysed it for a while. And i believe it is correct :)
– midnite
Jul 12 '13 at 21:00
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How to move a model between two Django apps (Django 1.7)
...um" set of operations differ depending on the situation, but the following procedure should work for most/all ForeignKey migrations:
COPY the model from app1 to app2, set db_table, but DON'T change any FK references.
Run makemigrations and wrap all app2 migration in state_operations (see above)
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Do asynchronous operations in ASP.NET MVC use a thread from ThreadPool on .NET 4
... (by preventing a queued resource blocking). Ultimately only measuring and analysing a system can indicate where you can gain efficiencies.
Edit:
In your example, the Task.Factory.StartNew call will queue up an operation on the .NET thread-pool. The nature of Thread Pool threads is to be re-used (...
SQL NVARCHAR and VARCHAR Limits
...into chunks and execute the string values. So, let's say you have a stored procedure like the following:
CREATE PROCEDURE ExecuteMyHugeQuery
@SQL VARCHAR(MAX) -- 2GB size limit as stated by Martin Smith
AS
BEGIN
-- Now, if the length is greater than some arbitrary value
-- Let's say 200...
When to use static vs instantiated classes
..., and the functions that act on them are the verbs. Static functions are procedural. You pass in the object of the functions as arguments.
Update: I'd also add that the decision is rarely between instance methods and static methods, and more between using classes and using associative arrays. F...
Why is the C++ STL is so heavily based on templates? (and not on *interfaces*)
...not the holy grail. It's a cute idea, and it was quite an improvement over procedural languages back in the 70's when it was invented. But it's honestly not all it's cracked up to be. In many cases it is clumsy and verbose and it doesn't really promote reusable code or modularity.
That is why the C...