- def as_sql(self, qn=None, connection=None):
- bits = []
- for item in self.children:
- if hasattr(item, 'as_sql'):
- sql, params = item.as_sql(qn=qn, connection=connection)
- bits.append(sql)
- continue
-
- constraint, lookup_type, y, values = item
- comp = get_lookup_operator(lookup_type)
- if lookup_type == 'in':
- equal_bits = [ "(%s%s%s)" % (constraint.col, comp, value) for value in values ]
- clause = '(|%s)' % ''.join(equal_bits)
- else:
- clause = "(%s%s%s)" % (constraint.col, comp, values)
-
- bits.append(clause)
-
- if not len(bits):
- return '', []
-
- if len(bits) == 1:
- sql_string = bits[0]
- elif self.connector == AND:
- sql_string = '(&%s)' % ''.join(bits)
- elif self.connector == OR:
- sql_string = '(|%s)' % ''.join(bits)
- else:
- raise Exception("Unhandled WHERE connector: %s" % self.connector)
-
- if self.negated:
- sql_string = ('(!%s)' % sql_string)
-
- return sql_string, []
-