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Python/postgres/psycopg2: getting ID of row just inserted
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cursor.execute("INSERT INTO .... RETURNING id")
id_of_new_row = cursor.fetchone()[0]
And please do not build SQL strings containing values manually. You can (and should!) pass values separately, making it unnecessary to escape and SQL injection impossible:
sql_stri...
What is the difference between loose coupling and tight coupling in the object oriented paradigm?
...y classes rather than having its own class.
Loose coupling is achieved by means of a design that promotes single-responsibility and separation of concerns.
A loosely-coupled class can be consumed and tested independently of other (concrete) classes.
Interfaces are a powerful tool to use for decou...
Which annotation should I use: @IdClass or @EmbeddedId
...PI) specification has 2 different ways to specify entity composite keys: @IdClass and @EmbeddedId .
7 Answers
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If vs. Switch Speed
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That means: switch (a) case "x": case "y": case "z": //something break; } is faster than: if(a=="x"||a=="b"||a=="c") //something right?
– yazanpro
Nov 16 '12 at 21:19
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Wrapping synchronous code into asynchronous call
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@StephenCleary. what do you mean by "...and since each operation is asynchronous, none of them are actually using a thread..." thanks!
– alltej
Sep 19 '16 at 14:27
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Do browsers parse javascript on every page load?
...avaScript using a hash of the source for up to 5 garbage collections. This means that two identical pieces of source code will share a cache entry in memory regardless of how they were included. This cache is not cleared when pages are reloaded.
Source
Update - 19/03/2015
The Chrome team have r...
document.getElementById vs jQuery $()
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Not exactly!!
document.getElementById('contents'); //returns a HTML DOM Object
var contents = $('#contents'); //returns a jQuery Object
In jQuery, to get the same result as document.getElementById, you can access the jQuery Object and get the first eleme...
How can I decrease the size of Ratingbar?
...tingBar with either ratingBarStyleSmall or a custom style inheriting from Widget.Material.RatingBar.Small (assuming you're using Material Design in your app).
Option 1:
<RatingBar
android:id="@+id/ratingBar"
style="?android:attr/ratingBarStyleSmall"
... />
Option 2:
// styles....
Track a new remote branch created on GitHub
...ay) is create a remote tracking branch for each branch on the remote. That means a branch on your local repo named <remote>/<branch>. A remote tracking branch is read-only, indicating where that branch was on the remote at last fetch. Calling checkout on that branch ref puts you in detac...
Django's SuspiciousOperation Invalid HTTP_HOST header
...es the if inside the server block and not in the location block. Does that mean that the if is okay in this instance?
– brian buck
Mar 18 '15 at 14:44
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