Rename Model(Table) in Django South Migration

When you change the name of model and create a migration file, you will see the code like “delete table, create table, and create relationship”.
It means you will lose all data in the previous model. However, here’s a simple way to rename model(table) with data.
Change the migration file as below or you may create yours.

class Migration(SchemaMigration):

    def forwards(self, orm):
        # Renaming model 'Tag' to 'RemarkTag'

    def backwards(self, orm):
        # Renaming model 'Tag' to 'RemarkTag'

Django says “Unable to open” SQLite3

First of all, make sure the db path in your settings file.

import os
PROJECT_ROOT = os.path.dirname(os.path.abspath(__file__))
    'default': {
        'ENGINE': 'django.db.backends.sqlite3', # Add 'postgresql_psycopg2', 'postgresql', 'mysql', 'sqlite3' or 'oracle'.
        'NAME': os.path.join(PROJECT_ROOT, 'talktrack.sqlite'), # Or path to database file if using sqlite3.
        'USER': '',                      # Not used with sqlite3.
        'PASSWORD': '',                  # Not used with sqlite3.
        'HOST': '',                      # Set to empty string for localhost. Not used with sqlite3.
        'PORT': '',                      # Set to empty string for default. Not used with sqlite3.

Then, check permissions below file and folders. (django needs full permissions)
1. db file.
i.e. yourapp.sqlite
2. /var/tmp
3. parent folder of db file
i.e. /var/www/yourapp
if the db file is in the folder. /var/www/yourapp/yourapp.sqlite

sudo chown -R user:group file-or-folder

.NET Formatting Strings

formatting strings

Example Output
String.Format(“–{0,10}–“, “test”); —      test–
String.Format(“–{0,-10}–“, “test”); –test      —

formatting numbers

Specifier Type Format Output

(double 1.2345)


(int -12345)

c Currency {0:c} $1.23 -$12,345.00
d Decimal (whole number) {0:d} System.FormatException -12345
e Exponent/scientific {0:e} 1.234500e+000 -1.234500e+004
f Fixed point {0:f} 1.23 -12345.00
g General {0:g} 1.2345 -12345
n Number {0:n} 1.23 -12,345.00
r Round trippable {0:r} 1.23 System.FormatException
x Hexadecimal {0:x4} System.FormatException ffffcfc7

custom number formatting

Specifier Type Format Output

(double 1234.56)

0 Zero placeholder {0:00.000} 1234.560
# Digit placeholder {0:#.##} 1234.56
. Decimal point placeholder {0:0.0} 1234.6
, Thousand separator {0:0,0} 1,235
% Percentage {0:0%} 123456%

Group separator

String.Format(“{0:$#,##0.00;($#,##0.00);Nothing}”, value);

This will output “$1,240.00” if passed 1243.56.  It will output the same format bracketed if the value is negative “($1,240.00)”, and will output the string “Nothing” if the number is zero.

date formatting

Specifier Type Output

(June 8, 1970 12:30:59)

d Short date 08/06/1970
D Long date 08 June 1970
t Short time 12:30
T Long time 12:30:59
f Full date and time 08 June 1970 12:30
F Full date and time (long) 08 June 1970 12:30:59
g Default date and time 08/06/1970 12:30
G Default date and time (long) 08/06/1970 12:30:59
M Day/Month 8 June
r RFC1123 date string Mon, 08 June 1970 12:30:59 GMT
s Sortable date/time 1970-06-08T12:30:59
u Universal time, local timezone 1970-06-08 12:30:59Z
Y Month/Year June 1970

custom date formatting

Specifier Type Output

(June 8, 1970 12:30:59)

dd Day 08
ddd Short day name Mon
dddd Full day name Monday
hh 2 digit hour 12
HH 2 digit hour (24 hour) 12
mm 2 digit minute 30
MM Month 06
MMM Short month name Jun
MMMM Month name June
ss Seconds 59
yy 2 digit year 70
yyyy 4 digit year 1970
: Separator, e.g. {0:hh:mm:ss} 12:30:59
/ Separator, e.g. {0:dd/MM/yyyy} 08/06/1970

Run Classic ASP on IIS 7

1. Go to Control Panel > Programs > Turn Windows features on or off

2. Check Internet Information Services and make sure ASP is enabled under this section
Internet Information Servies > World Wide Web Services > Application Development Features > ASP

3. Run inetmgr and double click on ASP icon under the web site

4. Set Enable Parent Paths to True

5. Drill down to Debugging Properties and set Send Errors To Browser under to True

6. Enable 32bit application on Windows 64 bit as the link below