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Django: Get an object form the DB, or 'None' if nothing matches
... cases where your logic expects there to be only a single object (which is selected by first()), but in reality multiple objects exist. Using get() instead of first() gives you an extra layer of protection, by raising MultipleObjectsReturned(). If the result being returned is not expected to return ...
Postgres: clear entire database before re-creating / re-populating from bash script
... q TEXT;
r RECORD;
BEGIN
-- triggers
FOR r IN (SELECT pns.nspname, pc.relname, pt.tgname
Why I can't change directories using “cd”?
...
To make a bash script that will cd to a select directory :
Create the script file
#!/bin/sh
# file : /scripts/cdjava
#
cd /home/askgelal/projects/java
Then create an alias in your startup file.
#!/bin/sh
# file /scripts/mastercode.sh
#
alias cdjava='. /scrip...
Profiling Django
...elps me to see how many queries django-orm hits the db, and we can see how select_related() function do the trick hitting it less.
– panchicore
Mar 2 '10 at 14:20
11
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Retrieve database or any other file from the Internal Storage using run-as
... procedure below:
search and open device file explorer
Select your handset and then browse to data/data directory
Now find your application package and go to databases folder. You can see the databases there and upon right click, you will get option
to save this in...
How to leave/exit/deactivate a Python virtualenv
...
This doesn't deserve the downvotes. See edit of selected response: source deactivate is for the anaconda environment.
– Doug Bradshaw
Nov 13 '15 at 19:52
...
How to theme the ENTIRE Xcode IDE to light-on-dark?
...ground by going into preferences ⌘., then go to Fonts & Colors, then select the Console. Now you can edit its background:
Just be sure to edit the font colors of the various input and outputs texts if you choose black. By default all of the input/output fonts are black, only the console pro...
Reading an Excel file in PHP [closed]
...)->Name = $WorkSheetName;
$this->xlBook->Worksheets(1)->Select;
if($XlsColumnWidth != null)
{
//$XlsColumnWidth = array("A1"=>15,"B1"=>20);
foreach($XlsColumnWidth as $Clm=>$Width)
{
//Set Columns Width
...
How can I comment a single line in XML?
... parser you are using. Personally, I use an IDE (oXygen) that allows me to select a piece of XML text, right click, and ask to comment it out. Which seems a lot easier than your technique.
– Michael Kay
Jun 28 '13 at 16:54
...
'\r': command not found - .bashrc / .bash_profile [duplicate]
...LIME TEXT
With sublime you just go to
View - > Line Endings -> (select)Unix
Then save the file. Will fix this issue.
Easy as that!
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