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From John Huss <johnth...@gmail.com>
Subject Re: Weirdnes with Expression's filterObjects results
Date Fri, 01 Jun 2012 14:54:32 GMT
Use ExpressionFactory.matchExp instead.  Building any sort of expression
from strings is a bad idea in my opinion.

On Fri, Jun 1, 2012 at 9:44 AM, Andrew Faust <arjfandy@gmail.com> wrote:

> Hey John appreciate the fast response...thanks.
>
> So....
>  String myFilter = "lastName = 'andy'"
> I understand that.... However
>  String myFilter = "isStaffMember = 'true'"
> How do you translate that into it's "object" form as you recommended?  The
> Expression.*fromString* method requires a String.  Are you suggesting I use
> a different filtering method that takes objects as parametes and not
> strings?  Thanks again..
>
> On Fri, Jun 1, 2012 at 10:31 AM, John Huss <johnthuss@gmail.com> wrote:
>
> > The string 'true' is not the same as the literal value true.  Same for
> > dates.  You need to pass these objects in object form, not as strings.
> >
> > On Fri, Jun 1, 2012 at 8:59 AM, Andrew Faust <arjfandy@gmail.com> wrote:
> >
> > > Good morning everybody.  I am using the following code with (mostly)
> good
> > > results:
> > >
> > >
> > > =============================================================
> > >
> > > String filterExpr = "*lastName* = 'Simth';
> > >
> > > SelectQuery personQuery = new SelectQuery(Person.*class*);
> > >
> > > List<Person> fullPersonList = ormContext.performQuery(personQuery);
> > >
> > > Expression filterExp = Expression.*fromString*(filterExpr);
> > >
> > > List<Person> filteredPersonList =
> > filterExp.filterObjects(fullPersonList);
> > >
> > > =============================================================
> > >
> > > This works well on any combination of operators such as =, >, <, and
so
> > > on.  This also worrks ok with numeric fields.  So, for string and
> numeric
> > > fields this code works ok.
> > >
> > >
> > >
> > > *HOWEVER*; when I try to filter fields that are booleans or dates then
> I
> > *
> > > always* get back an empty results set.  For example...
> > >
> > >
> > >
> > > Change filterExpr to *filterExpr = "isStaffMember = 'true'"* runs ok
> but
> > > returns 0 records which is NOT correct.  Note that if I don't use the '
> > > character then I get runtime EXCEPTIONS.
> > >
> > > Change filterExpr to *filterExpr = "startDate = '2012-02-01'" *again
> runs
> > > ok but returns 0 records which is NOT correct.
> > >
> > >
> > >
> > > Here are some of my runtime particulars:
> > >
> > > JDK/JRE: 1.6.0_31
> > >
> > > Cayenne version: 3.0.2
> > >
> > > DerbyDB version: 10.8.1.2
> > >
> > > The database/java fields are: String=VARCHAR/String; numbers are
> > > integer/Integer; dates are DATE/Date; and booleans are boolean/Boolean.
> > >
> > >
> > >
> > > In summary, the filterExpFilterObjects(...) seems to work fine IF the
> > > fields are strings or numbers; but is NOT working as expected with
> Dates
> > or
> > > Booleans.  Any ideas anyone?
> > >
> >
>

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