Re: [Zope] Weird SQL Relay conversion error in Zope
Mike Driscoll wrote at 2008-5-9 08:31 -0500: ... I am working on a web app that interfaces with Microsoft SQL Server from Ubuntu through SQL Relay. I will be getting data from multiple databases. The issue seems to be that either Zope or SQL Relay cannot handle the Decimal type if the value is a null. If I do a query like this: ... * Module Products.ZSQLRelayDA.db, line 86, in query * Module decimal, line 571, in __new__ * Module decimal, line 2267, in _raise_error InvalidOperation: (Also, the following error occurred while attempting to render the standard error message, please see the event log for full details: '@@plone') Looks like a bug in ZSQLRelayDA.db. Apparently, it passes SQL decimal values to Python's decimal module -- even if the SQL value is Null (almost surely mapped to Python's None). For obvious reasons, decimal does not like to convert None into a decimal value. ZSQLRelayDA.db should test for None and call the decimal constructor only for non None values. -- Dieter ___ Zope maillist - Zope@zope.org http://mail.zope.org/mailman/listinfo/zope ** No cross posts or HTML encoding! ** (Related lists - http://mail.zope.org/mailman/listinfo/zope-announce http://mail.zope.org/mailman/listinfo/zope-dev )
Re: [Zope] Weird SQL Relay conversion error in Zope
Dieter, Mike Driscoll wrote at 2008-5-9 08:31 -0500: ... I am working on a web app that interfaces with Microsoft SQL Server from Ubuntu through SQL Relay. I will be getting data from multiple databases. The issue seems to be that either Zope or SQL Relay cannot handle the Decimal type if the value is a null. If I do a query like this: ... * Module Products.ZSQLRelayDA.db, line 86, in query * Module decimal, line 571, in __new__ * Module decimal, line 2267, in _raise_error InvalidOperation: (Also, the following error occurred while attempting to render the standard error message, please see the event log for full details: '@@plone') Looks like a bug in ZSQLRelayDA.db. Apparently, it passes SQL decimal values to Python's decimal module -- even if the SQL value is Null (almost surely mapped to Python's None). For obvious reasons, decimal does not like to convert None into a decimal value. ZSQLRelayDA.db should test for None and call the decimal constructor only for non None values. I suspected as much. I mentioned trying SQLAlchemy to my boss and he tried it to see if it could handle this issue and it does. So we'll probably stick with that, but thanks for the clarification. Mike ___ Zope maillist - Zope@zope.org http://mail.zope.org/mailman/listinfo/zope ** No cross posts or HTML encoding! ** (Related lists - http://mail.zope.org/mailman/listinfo/zope-announce http://mail.zope.org/mailman/listinfo/zope-dev )
[Zope] Weird SQL Relay conversion error in Zope
Hi, I am working on a web app that interfaces with Microsoft SQL Server from Ubuntu through SQL Relay. I will be getting data from multiple databases. The issue seems to be that either Zope or SQL Relay cannot handle the Decimal type if the value is a null. If I do a query like this: SELECT * from myDatabase I get the following: error Site Error An error was encountered while publishing this resource. InvalidOperation Sorry, a site error occurred. Traceback (innermost last): * Module ZPublisher.Publish, line 194, in publish_module_standard * Module Products.PlacelessTranslationService.PatchStringIO, line 34, in new_publish * Module ZPublisher.Publish, line 146, in publish * Module Zope2.App.startup, line 222, in zpublisher_exception_hook * Module ZPublisher.Publish, line 115, in publish * Module ZPublisher.mapply, line 88, in mapply * Module ZPublisher.Publish, line 41, in call_object * Module Shared.DC.ZRDB.Connection, line 115, in manage_test * Module Products.ZSQLRelayDA.db, line 86, in query * Module decimal, line 571, in __new__ * Module decimal, line 2267, in _raise_error InvalidOperation: (Also, the following error occurred while attempting to render the standard error message, please see the event log for full details: '@@plone') /error If I change it to SELECT empid, reg from myDatabase it will work as long as reg is not a NULL. I can get it to work if I use isnull functions on all my decimal type fields, but I would like to avoid that. Is this a known issue with a workaround? I am using Zope 2.9.4-final on Ubuntu with SQL Relay 0.39.4. Mike Driscoll Applications Specialist MCIS - Technology Center ___ Zope maillist - Zope@zope.org http://mail.zope.org/mailman/listinfo/zope ** No cross posts or HTML encoding! ** (Related lists - http://mail.zope.org/mailman/listinfo/zope-announce http://mail.zope.org/mailman/listinfo/zope-dev )
