I now have the code below, but the _oracle_utc_timestamp function is
never called, even when I do explicitly set a value.
class UTCTimestamp(TypeDecorator):
impl = TIMESTAMP
# add the UTC time zone info to naive timestamps
def process_result_value(self, value, dialect) :
if value != None :
value = UTC.localize(value)
return value
def process_bind_param(self, value, dialect):
# if we have a value convert it to UTC if needed
if value != None :
if value.tzinfo :
value = value.astimezone(UTC)
return value
class utc_timestamp(FunctionElement):
type = DateTime()
@compiles(utc_timestamp)
def _oracle_utc_timestamp(element, compiler, **kw):
import pdb
pdb.set_trace()
On Feb 8, 6:09 pm, Michael Bayer <mike...@zzzcomputing.com> wrote:
> On Feb 8, 2011, at 4:56 PM, chris e wrote:
>
> > To simplify date handling in a project on which I am working, I am
> > storing UTC dates in the database in a timestamp with timezone field,
> > however, because cx_Oracle does not have any timezone functionality, I
> > need to cast the UTC timestamp I'm inserting into the database as a
> > timestamp in UTC so that the database does not convert it to the db
> > timezone. This also needs to apply to default values.
>
> > I have the following, however, it is not called for default values:
>
> The @compiles for _BindParamClause was never expected and is not covered
> within a visit_insert() right now. Ticket #2042 is added. However, you're
> better off using SQL level UTC functions for defaults in any case which would
> be the workaround here. Here's one I use for PG + SQL Server. You can add
> another for Oracle that includes your CAST expression if needed:
>
> class utcnow(expression.FunctionElement):
> type = DateTime()
>
> @compiles(utcnow, 'postgresql')
> def _pg_utcnow(element, compiler, **kw):
> return "TIMEZONE('utc', CURRENT_TIMESTAMP)"
>
> @compiles(utcnow, 'mssql')
> def _ms_utcnow(element, compiler, **kw):
> return "GETUTCDATE()"
>
> > from pytz import UTC
> > class UTCDateTime(TypeDecorator):
> > impl = TIMESTAMP
>
> > # add the UTC time zone info to naive timestamps
> > def process_result_value(self, value, dialect) :
> > if value != None :
> > value = UTC.localize(value)
>
> > return value
>
> > @compiles(_BindParamClause)
> > def _compile_utc_date(element, compiler, **kw):
> > if isinstance(element.type, UTCDateTime) :
> > return "from_tz(cast(%s as timestamp), 'UTC')" \
> > % compiler.visit_bindparam(element, **kw)
>
> > return compiler.visit_bindparam(element, **kw)
>
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