test_field.py 文件源码

def does_type_exist(self, type_name):
        """
        Check if a composite type exists in the database
        """
        sql = 'select exists (select 1 from pg_type where typname = %s);'
        with connection.cursor() as cursor:
            cursor.execute(sql, [type_name])
            row = cursor.fetchone()
            return row[0]