Dynamic raw query (select clause) Django

Django Internals ORM
13

Prepared query step by step

Input data (Columns I need)

self.export_col = “a,b,c”

def calc_col(self):
        if self.exp == 'T':
            select_col = ""
            self.export_col = self.export_col.split(',')
            for col in self.export_col:
                select_col += col + ","
            select_col = select_col[:-1]
            self.export_col = select_col
        else:
            self.export_col += '*'

def prepare_query(self):
        query += " SELECT "
        query += self.export_col
        query += """ from table limit 2;"""