operations.py 文件源码

def subtract_temporals(self, internal_type, lhs, rhs):
        lhs_sql, lhs_params = lhs
        rhs_sql, rhs_params = rhs
        if internal_type == 'TimeField':
            return "django_time_diff(%s, %s)" % (lhs_sql, rhs_sql), lhs_params + rhs_params
        return "django_timestamp_diff(%s, %s)" % (lhs_sql, rhs_sql), lhs_params + rhs_params