I realize this is a very old question but it took me a little while to find
the 'proper way' and/or 'pythonic+sqlalchemy' way to do it so here is the
solution:
from sqlalchemy.sql.functions import GenericFunction
class XMLTypeFunc(GenericFunction):
type=CLOB
name='XMLType'
identifier='XMLTypeFunc'
from sqlalchemy.types import TypeDecorator
from lxml import etree #make this safe for built-in etree as well - Matt
class XMLType(TypeDecorator):
impl = CLOB
type = 'XMLTYPE' #etree.Element
def get_col_spec(self):
return 'XMLTYPE'
def bind_processor(self, dialect):
def process(value):
if value is not None:
return etree.tostring(value, encoding='UTF-8',
pretty_print='True')
#return etree.dump(value)
else:
return None
return process
def process_result_value(self, value, dialect):
if value is not None:
value = etree.fromstring(value)
return value
def bind_expression(self, bindvalue):
return XMLTypeFunc(bindvalue)
On Sunday, September 12, 2010 at 6:23:16 AM UTC-4, millsks wrote:
>
> I was curious if there were any way to pull a XMLType field into a
> python field when using declarative. I have been able to do it with
> cx_Oracle by executing a query using XMLType.getClobVal and would
> probably work with sqlalchemy's manual query system too, but would
> love it if I could use it as part of an ORM object as an actual column/
> field or as a relationship.
>
> If this is possible where should I look to learn how to integrate it
> into our sqlalchemy code?
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