Hello, Is it possible to tell, which instance was used to call the classmethod that is currently running?
Background: I have a class called DatabaseConnection and it has a classmethod called process_create_tables. This method should create some database tables defined by a database definition object. The DatabaseConnection has many descendants, for example PostgreSQLConnection. Descendants know how to create tables in a given RDBMS type. I also use subclasses of the 'SQLProcessor' class, that processes SQL commands in different ways (print to stdout, write to file, execute directly in the database etc.) I would like to use the process_create_tables classmethod as is, because sometimes I only need to save a SQL script. However, I also want to use the same classmethod to create tables directly into an existing database. That database is presented as a DatabaseConnection instance. In that case, I only want to create the tables that do not exists yet. Examples: processor = SQLProcessors.StdOutProcessor() # Print to stdout PostgreSQLConnection.process_create_tables(processor,dbdef) # This sould create all tables, using the processor processor = SQLProcessors.DirectProcessor(conn) # Execute directly conn.process_create_tables(processor,dbdef) # This should create non-existing tables only, using the processor Is this possible? Maybe there is a better way to achieve this, I'm not sure. I was thinking about this construct: @classsmethod def process_create_tables(cls,processor,dbdef,conn=None) and then calling it as conn.process_create_tables(processor,dbdef,conn) but this looks very ugly to me. It would be much easier if I could tell which instance (if any) was used to call the classmethod. Thanks, Les -- http://mail.python.org/mailman/listinfo/python-list
