Sun, 02 Nov 2008 18:58:35 +0000
When you're building an application you have to extends your model (and alter database schema that is placed under the model). I've found a method to automatically upgrade SQL schema (only ADD COLUMN operations for now):
from sqlobject import *
import logging
class Base(SQLObject):
def migrate(self, *args, **kv):
conn = self._connection
schema = {}
cols = self.sqlmeta.columns
for a in conn.columnsFromSchema(self.sqlmeta.table, self):
schema[a.name] = a
logging.debug("existing schema: %s" % schema)
for name, col in cols.iteritems():
if name not in schema.keys():
logging.info("add column: %s.%s" % (self.__class__.__name__, name))
conn.addColumn(self.sqlmeta.table,col)
migrate = classmethod(migrate)
migrate() class method only handles simplest case (adding a new column), but it may be sufficient in typical development process (more advanced transformations will still require SQL migration scripts written by hand).
Enjoy!
