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custom sql without table names

Author:
robharvey
Posted:
May 18, 2007
Language:
Python
Version:
.96
Score:
1 (after 5 ratings)

Keeps database table names out of custom SQL code, but still allows for correct parameter passing in the execute function. (psycopg doesn't substitute table or field names, only data, in the execute function)

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    # dict indexed to model names
    tables = {'str':'%s'}
    for x in ModelOne, ModelTwo:
        tables[x._meta.object_name] = x._meta.db_table

    cursor = connection.cursor()
    ex_str =  """\
    select field1, field2, sum(field3) from %(ModelOne)s where date between %(str)s and %(str)s 
    group by field1, field2
    """ % tables
    cursor.execute(ex_str, dates)
    sumt = cursor.fetchall()

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