Question

Is it possible to construct raw SQL queries in Django so that they accept a dynamic number of arguments? So for example say that I have the following url structure in my app:

/books/category/history/
/books/category/history/1800s/

For the first query, I’m looking for all books with the keyword ‘history’, and for the second, I’m looking for all books with the keyword ‘history’ AND the keyword ‘1800s’.

I currently have two separate queries for each of these:

keyword1 = 'history'
SELECT appname_book.name AS name FROM appname_book WHERE keyword=%s,[keyword1]

keyword1 = 'history'
keyword2 = '1800s'
SELECT appname_book.name AS name FROM appname_book WHERE keyword=%s AND keyword=%s,[keyword1, keyword2]

Anyone know of a cleaner and more efficient way to do this?

I’m using Django 1.3 and MySQL.

Thanks.

Answer 1

Why dont you use Django QuerySet, like this:

Book.objects.all().filter(keyword__in=['history','1800s']).values('name')

Another possible solution using RAW SQL, coud be:

keywords = []
SQL = 'SELECT appname_book.name AS name FROM appname_book WHERE 1=1 '
SQL += ' '.join(['AND keyword=%s' for _ in params])