Hello Andrus,
I can get data from a table or a view, what about a StoredProcedure? can i
get data from it?
cos this could be the solution for Dave's problem
Sako.
----- Original Message -----
From: "Andrus Adamchik" <[EMAIL PROTECTED]>
To: <[email protected]>
Sent: Thursday, June 07, 2007 12:44 PM
Subject: Re: Select Query on Table with no Primary Key
To give an example - if you have an EMPLOYEE table, you can make an
assumption that it is highly unlikely that there are two people with the
same name, born on the same date, and working in the same department. On
that assumption you can mark these 4 columns as PK in the Modeler:
FIRST_NAME, LAST_NAME, DATE_OF_BIRTH, DEPARTMENT_ID.
Works well with views or tables (updateable or read-only) on any DB.
Andrus
On Jun 7, 2007, at 1:29 PM, Andrus Adamchik wrote:
Tore is right - for Cayenne to handle an object (whether read-only on
read/write), it needs to know which column or columns uniquely identify
each row. Now... you can fake a PK in your model, even if there's none
in the db - just select a really unique combination of columns, and mark
those columns as the PK in the modeler. I've mapped tables with such
"imaginary PK" a lot.
If it is not possible (i.e. duplicate rows are expected to be fetched),
you will have to use DataRows.
Andrus
On Jun 7, 2007, at 1:04 PM, Tore Halset wrote:
On Jun 6, 2007, at 16:12 , Dave Merrin wrote:
I'm trying to run a SelectQuery on a table with no primary key.
Unfortunately it's not working. Can anybody help? I have no control
over the database so I can't add in primary keys.
As you know the PK are essential not only to update a row, but to make
sure a single row maps to a single DataObject in your context.
Some database engines do have a unique invisible column. If your
database does this, then perhaps you could map that column as your
primary key? What database engine are you using?
Regards,
- Tore.
