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Re: [eclipselink-users] Which dynamic type to query?
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OK
I will try that once I am back on my development machine. Could you please explain the rationale behind this?
Thanks
Member Technical Staff
Oracle India Private Limited
91 80 41085685
----- Original Message -----
From: jamesssss@xxxxxxxxx
To: eclipselink-users@xxxxxxxxxxx
Sent: Wednesday, December 8, 2010 9:59:25 PM GMT +05:30 Chennai, Kolkata, Mumbai, New Delhi
Subject: Re: [eclipselink-users] Which dynamic type to query?
Use,
query.addJoinedAttribute(query.getExpressionBuilder().anyOf("id1"));
Rohit Banga-2 wrote:
>
> Hello All
>
> I am currently experimenting with eclipselink dynamic persistence:
>
> http://wiki.eclipse.org/EclipseLink/Development/JPA/Dynamic
>
> I am creating an Employee and a Department class with a One-To-Many
> mapping from the department to employee tables using the following code:
>
> departmentTypeBuilder.addOneToManyMapping("id1",
> employeeTypeBuilder.getType(), "empinfo.depid");
> employeeTypeBuilder.addOneToOneMapping("id1",
> departmentTypeBuilder.getType(), "empinfo.depid");
>
> This is based on the explanation at the following page:
> http://wiki.eclipse.org/Introduction_to_Relational_Mappings_(ELUG)
>
> After this I add both the types as follows:
>
> helper.addTypes(false, true, departmentTypeBuilder.getType(),
> employeeTypeBuilder.getType());
> helper.addTypes(false, true, employeeTypeBuilder.getType(),
> departmentTypeBuilder.getType());
>
> // helper.addTypes(false, false, employeeTypeBuilder.getType());
> // also works, but don't know why? which one is correct?
>
> After this I create a ReadAllQuery:
>
> ReadAllQuery query = new
> DynamicHelper(session).newReadAllQuery(employeeTypeBuilder.getType().getDescriptor().getAlias());
> query.addJoinedAttribute("id1");
>
> query.prepareCall(session, new DatabaseRecord());
>
> The above code works. However if I create a query using
> "departmentTypeBuilder.getType().getDescriptor().getAlias()", I get the
> following exception:
>
> Exception Description: Invalid use of a query key
> [org.eclipse.persistence.mappings.OneToManyMapping[id1]] representing a
> "to-many" relationship in an expression. Use anyOf() rather than get().
> at
> org.eclipse.persistence.exceptions.QueryException.invalidUseOfToManyQueryKeyInExpression(QueryException.java:735)
> at
> org.eclipse.persistence.internal.expressions.QueryKeyExpression.validateNode(QueryKeyExpression.java:887)
> at
> org.eclipse.persistence.expressions.Expression.normalize(Expression.java:3009)
> at
> org.eclipse.persistence.internal.expressions.DataExpression.normalize(DataExpression.java:342)
> ...
>
> Can you please tell me why this fails? Are there any rules regarding
> which DynamicType to query for various type of mappings possible between
> tables?
>
> Thanks in Advance.
>
> --
> Thanks and Regards
> Rohit Banga
> Software Developer
> Oracle Server Technologies
>
> _______________________________________________
> eclipselink-users mailing list
> eclipselink-users@xxxxxxxxxxx
> https://dev.eclipse.org/mailman/listinfo/eclipselink-users
>
>
-----
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