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Altering column size in SQL Server
... It's also important that if the column is with attribute NOT NULL then it has to be mentioned in the query else it will set it to NULL by default. ALTER TABLE [Employee] ALTER COLUMN [Salary] NUMERIC(22,5) NOT NULL
– Suvendu Shekhar Giri
Jun 29 '15 at...
How do HashTables deal with collisions?
...n hash tables very slow.
Option 2: If the hash table entries are all full then the hash table can increase the number of buckets that it has and then redistribute all the elements in the table. The hash function returns an integer and the hash table has to take the result of the hash function and m...
Restful way for deleting a bunch of items
... to:
http://example.com/resources/selections/DF4XY7
On this page you will then see a (javascript) confirm box, which if you confirm will do a request of:
DELETE http://example.com/resources/selections/DF4XY7
which, if successful, should respond with:
HTTP/1.1 200 Ok (or whatever is appropriate fo...
How do I rename a column in a SQLite database table?
...umn name change would result in a semantic ambiguity in a trigger or view, then the RENAME COLUMN fails with an error and no changes are applied.
Image source: https://www.sqlite.org/images/syntax/alter-table-stmt.gif
Example:
CREATE TABLE tab AS SELECT 1 AS c;
SELECT * FROM tab;
ALTER TABLE ...
How does one unit test routes with Express?
...e minimal dependence on the Express Request and Response classes as such.
Then in the request handlers you need to call appropriate methods of your core logic classes.
I'll put an example up once I've finished restructuring my current app!
I guess something like this? (Feel free to fork the gist ...
Unescape HTML entities in Javascript?
...a huge disadvantage: if the string you are trying to convert isn't trusted then you will end up with a Cross-Site Scripting (XSS) vulnerability. For the function in the accepted answer, consider the following:
htmlDecode("<img src='dummy' onerror='alert(/xss/)'>");
The string here contains ...
Convert RGB to RGBA over white
...
Take the lowest color component, and convert that to an alpha value. Then scale the color components by subtracting the lowest, and dividing by the alpha value.
Example:
152 converts to an alpha value of (255 - 152) / 255 ~ 0.404
152 scales using (152 - 152) / 0.404 = 0
177 scales using (17...
When should an IllegalArgumentException be thrown?
...or is a specific example: if a particular case indicates programmer error, then you should throw an unchecked exception; you want the programmer to have a stack trace of where the logic problem occurred, not to try to handle it yourself.)
If there's no hope of recovery, then feel free to use unchec...
What exactly is a reentrant function?
...)
{
foo(bar);
return 0;
}
If the lock on mutex is not recursive, then here's what will happen, in the main thread:
main will call foo.
foo will acquire the lock.
foo will call bar, which will call foo.
the 2nd foo will try to acquire the lock, fail and wait for it to be released.
Deadloc...
applicationWillEnterForeground vs. applicationDidBecomeActive, applicationWillResignActive vs. appli
...you open background apps list from your app (double-click home button) and then return back to it (choose your app's preview) - -applicationWillEnterForeground: won't be called, only -applicationDidEnterBackground: (suppose, iOS don't think that it's a relaunch).
– kpower
...