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From Joe Baldwin <>
Subject Re: Qualifier Expression
Date Sat, 14 Mar 2009 21:28:50 GMT

Here is the working SQL

	select customer.billAddressOID, custAddress.oid, customerID, lastName  
from customer, custAddress where customer.billAddressOID =  

This SQL returns the result set that I am needing.   My brain is stuck  
in SQL, and I am trying to train myself to think from the Cayenne  
perspective.  I would like to end up with a List of Customer entities.

Customer has two addresses (billing & shipping both are to-one  
relationships).  I would like to search for a list of Customers based  
on individual fields in each of the address entities.


On Mar 14, 2009, at 3:53 PM, Robert Zeigler wrote:

> Hi Joe,
> How about:
> SelectQuery query = new SelectQuery(Entity1.class);
> query.setQualifier(ExpressionFactory.matchExp(Entity1.EN| 
> TITY2_PROPERTY,entity2));//where ENTITY2_PROPERTY is the name of  
> object property in entity1 that points to entity2
> List<Entity1> e1 = objectContext.performQuery(query);//note: perform  
> query is NOT generified, so you'll get a warning here.
> Robert
> On Mar 14, 2009, at 3/141:29 PM , Joe Baldwin wrote:
>> I am attempting to create the simplest Cayenne-expedient method of  
>> doing the following query. (I can easily do this in SQL but am a  
>> tad confused with the Cayenne Expression method.)
>> I have an Entity (E1) with a one to one relationship with a second  
>> entity (E2).  I would like to perform a SELECT Query with a filter  
>> on one of the fields of the relationship-entity (E2.F1) and return  
>> a list of the first entity (E1List).
>> What is the most efficient Cayenne way to do this?  (I am still a  
>> bit confused concerning how to construct efficient queries in the  
>> object domain vs the relational domain.)
>> Thanks,
>> Joe

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