Re: [eclipselink-users] DynamicClass Name containing a dot

[Doug Clarke <douglas.clarke@xxxxxxxxxx>]

The alias is used in JPQL statements so you will need to make sure the class name is a legal java class name and the alias is a legal identifier in JPQL/Criteria.

Doug

On 2011-04-16, at 8:26 AM, Rohit Banga <rohit.banga@xxxxxxxxxx> wrote:

Hi Dennis
AFAIK when you create a DynamicType you specify a type name which is the like the fully qualified (package + class name) name of a java class. So typically you will give a type name like "p1.c1" where c1 is treated as the class name or the alias for the type.
Thanks
Rohit

----- Original Message -----
From: dennis.fuglsang@xxxxxxxxxx
To: rohit.banga@xxxxxxxxxx, eclipselink-users@xxxxxxxxxxx
Cc: jamesssss@xxxxxxxxx
Sent: Saturday, April 16, 2011 6:12:34 AM GMT +05:30 Chennai, Kolkata, Mumbai, New Delhi
Subject: RE: [eclipselink-users] DynamicClass Name containing a dot

For an alias to a Java class name what are the set of invalid characters that cannot be used?   I tried to use a ‘:’ character in my alias and encountered a parser exception.

 

From: Rohit Banga
Sent: Wednesday, April 13, 2011 10:33 AM
To: EclipseLink User Discussions
Cc: James Sutherland
Subject: Re: [eclipselink-users] DynamicClass Name containing a dot

 

Thanks James for the clarification. I missed the fact that I was using the alias.
Instead of getAlias() I should use getJavaClassName().
Better still I will consider having different type names across the packages.

Thanks
Rohit

On 4/13/2011 8:18 PM, James Sutherland wrote:

The issue is that the alias defaults to the simple class name.

If you use the full packaged name it will get the correct class.

ReadAllQuery query2 = new DynamicHelper(session).newReadAllQuery("p2.type"); 

or,

ReadAllQuery query2 = new DynamicHelper(session).newReadAllQuery(

type2Builder.getType().getDescriptor().getJavaClass().getName()); 

or just,

ReadAllQuery query2 = new

ReadAllQuery(type2Builder.getType().getDescriptor().getJavaClass());

You should set the alias on one (or both) or your descriptors to be

different, as having two descriptors with the same alias is a bad idea.

type2Builder.getType().getDescriptor().setAlias("p2.type");

Rohit Banga-2 wrote:

Hi All

When we create a DynamicClass using 

DynamicClassLoader.createDynamicClass(className), then how is the class 

name expected to be interpreted if it contains a dot character.

Lets say if the className be "p.c".

Is "p" treated as the package and "c" as the class within the package?

The attached program throws the following exception:

Exception [EclipseLink-51000] (Eclipse Persistence Services - 

2.3.0.v20110324-r9156):

org.eclipse.persistence.exceptions.DynamicException

Exception Description: Invalid DynamicEntity[DynamicEntityType(type) - 

RelationalDescriptor(p1.type --> [DatabaseTable(addrinfo)])] property 

name: addrline2

     at 

org.eclipse.persistence.exceptions.DynamicException.invalidPropertyName(DynamicException.java:66)

     at 

org.eclipse.persistence.internal.dynamic.DynamicEntityImpl.get(DynamicEntityImpl.java:145)

     at jpatest.UniqueTypeName.main(UniqueTypeName.java:79)

Ideally I would expect p1.type and p2.type to be treated as separated 

classes. Is the above behavior expected or is it a bug in Eclipselink?

-- 

Thanks and Regards

Rohit Banga

Member Technical Staff

Oracle Server Technologies

import java.util.List;

import java.util.Vector;

import org.eclipse.persistence.dynamic.DynamicClassLoader;

import org.eclipse.persistence.dynamic.DynamicEntity;

import org.eclipse.persistence.dynamic.DynamicHelper;

import org.eclipse.persistence.dynamic.DynamicTypeBuilder;

import org.eclipse.persistence.internal.sessions.DatabaseSessionImpl;

import org.eclipse.persistence.jpa.dynamic.JPADynamicTypeBuilder;

import org.eclipse.persistence.queries.ReadAllQuery;

import org.eclipse.persistence.sessions.DatabaseLogin;

import org.eclipse.persistence.sessions.DatabaseRecord;

import org.eclipse.persistence.sessions.DatabaseSession;

public class UniqueTypeName

{

  public static void main(String[] args)

  {

         DatabaseLogin login = new DatabaseLogin();

         login.setUserName("*****");

         login.setPassword("*****");

         login.setDriverURLHeader("jdbc:oracle:thin:@");

         login.setDriverClassName("oracle.jdbc.OracleDriver");

         login.setDatabaseURL("***************");

         DatabaseSession session = new DatabaseSessionImpl(login);

         session.login();

         DynamicHelper helper = new DynamicHelper(session);

         DynamicClassLoader dcl = helper.getDynamicClassLoader();

         Class<?> type1 = dcl.createDynamicClass("p1.type");

         Class<?> type2 = dcl.createDynamicClass("p2.type");

         DynamicTypeBuilder type1Builder = new JPADynamicTypeBuilder(type1, null,

"addrinfo");

         DynamicTypeBuilder type2Builder = new JPADynamicTypeBuilder(type2, null,

"addrinfo");

         type1Builder.setPrimaryKeyFields("addrid");

         type1Builder.addDirectMapping("addrid", String.class, "addrid");

         type1Builder.addDirectMapping("addrline1", String.class, "addr1");

         type2Builder.setPrimaryKeyFields("addrid");

         type2Builder.addDirectMapping("addrid", String.class, "addrid");

         type2Builder.addDirectMapping("addrline1", String.class, "addr1");

         type2Builder.addDirectMapping("addrline2", String.class, "addr2");

         helper.addTypes(false, true, type2Builder.getType(),

type1Builder.getType());

         ReadAllQuery query = new DynamicHelper(session).newReadAllQuery(

                         type1Builder.getType().getDescriptor().getAlias());

         query.prepareCall(session, new DatabaseRecord());

         System.out.println("query: " + query.getSQLString());

         List<DynamicEntity> emps = (List<DynamicEntity>)

session.executeQuery(query);

         for (DynamicEntity entity : emps)

         {

                 System.out.println(entity.get("addrid"));

                 System.out.println(entity.get("addrline1"));

                 System.out.println();

         }

         ReadAllQuery query1 = new DynamicHelper(session).newReadAllQuery(

                         type2Builder.getType().getDescriptor().getAlias());

         query1.prepareCall(session, new DatabaseRecord());

         System.out.println("query: " + query1.getSQLString());

         emps = (List<DynamicEntity>) session.executeQuery(query1);

         for (DynamicEntity entity : emps)

         {

                 System.out.println(entity.get("addrid"));

                 System.out.println(entity.get("addrline1"));

                 System.out.println(entity.get("addrline2"));

                 System.out.println();

         }

  }

}

-----

http://wiki.eclipse.org/User:James.sutherland.oracle.com James Sutherland 

http://www.eclipse.org/eclipselink/

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TopLink 

Wiki:  http://wiki.eclipse.org/EclipseLink EclipseLink , 

http://wiki.oracle.com/page/TopLink TopLink 

Forums:  http://forums.oracle.com/forums/forum.jspa?forumID=48 TopLink , 

http://www.nabble.com/EclipseLink-f26430.html EclipseLink 

Book:  http://en.wikibooks.org/wiki/Java_Persistence Java Persistence 

Blog:  http://java-persistence-performance.blogspot.com/ Java Persistence

Performance 

 

--
Thanks and Regards
Rohit Banga
Member Technical Staff
Oracle Server Technologies

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