Hello,
Yes, same msg:
[#|2007-12-05T19:00:44.843+0000|INFO|sun-appserver9.1|javax.enterprise.system.stream.out|_ThreadID=17;_ThreadName=httpSSLWorkerThread-8080-1;|Can not access DB data|#]
[#|2007-12-05T19:00:53.609+0000|INFO|sun-appserver9.1|javax.enterprise.system.stream.out|_ThreadID=17;_ThreadName=httpSSLWorkerThread-8080-1;|Can not access DB data|#]
here is the change code:
public List<lightingspecreimp.Lampent> allLightingpro(){ List results=emp.createNamedQuery("getAlldetails").getResultList(); return results; }
Could it be that I need to make changes to my toString method of my Lampent:
public String toString() {String s= pnumb + " " + catergory + " " + lwoltage + " " + lamManufacturerent ; return s;}
or even, the get and set methods in Lampent relating to lamManufacturerent :
public LamManufacturerent getLamManufacturerent() {return lamManufacturerent;}
public void setLamManufacturerent(LamManufacturerent lamManufacturerent) {this.lamManufacturerent=lamManufacturerent;}
The above get method means it will return an object of lamManufacturerent not fields.
So how do I get fields of lamManufacturerent from Lampent?
Thanks
eve
Date: Tue, 4 Dec 2007 15:07:54 -0800From: Craig.Russell_at_Sun.COMTo: persistence_at_glassfish.dev.java.netSubject: Re: question on entity relationshipsHi eve,
The return type of the query should not be List<Lampent> since you're not returning Lampent instances, just a bunch of fields.
Do you get the same exception if you do:
List results=emp.createNamedQuery("getAlldetails").getResultList();
Craig
On Dec 4, 2007, at 3:01 PM, Eve Pokua wrote:
Hello,I have checked this and made changes to this:@NamedQuery(name ="getAlldetails", query=" SELECT l.pnumb, l.catergory, l.lwoltage, lm.manuname FROM Lampent l LEFT OUTER JOIN l.lamManufacturerent lm")I am still not able to retreive data. error msg:[#|2007-12-04T22:51:10.754+0000|INFO|sun-appserver9.1|oracle.toplink.essentials.session.file:/C:/Sun/SDK2/domains/domain1/applications/j2ee-apps/LIGHTINGSPEC/LIGHTINGSPEC-ejb_jar/-LIGHTINGSPEC-ejbPU3|_ThreadID=19;_ThreadName=httpSSLWorkerThread-8080-1;|file:/C:/Sun/SDK2/domains/domain1/applications/j2ee-apps/LIGHTINGSPEC/LIGHTINGSPEC-ejb_jar/-LIGHTINGSPEC-ejbPU3 login successful|#][#|2007-12-04T22:51:11.234+0000|INFO|sun-appserver9.1|javax.enterprise.system.stream.out|_ThreadID=19;_ThreadName=httpSSLWorkerThread-8080-1;|Can not access DB data|#]here is the cde from my implementation:public List<lightingspecreimp.Lampent> allLightingpro(){ List<Lampent> results=emp.createNamedQuery("getAlldetails").getResultList(); return results; }apprecaite your everything. thankseve> From: gordon.yorke@oracle.com> To: persistence@glassfish.dev.java.net> Date: Mon, 3 Dec 2007 16:32:03 -0500> Subject: RE: question on entity relationships> > Hello eve,> Did you cut and paste that query or type it in? There is a typo in the FROM clause.> > @NamedQuery(name ="getAlldetails", query=" SELECT l.pnumb, l.catergory, l.lwoltage, lm.manuname FROM Lampent l LEFT OUTER JOIN *l*.LamManufacturerent lm")> > --Gordon> > -----Original Message-----> From: Eve Pokua [mailto:gorgeous65@msn.com]> Sent: Monday, December 03, 2007 4:28 PM> To: persistence@glassfish.dev.java.net> Subject: RE: question on entity relationships> > > > > Thanking you for your reply.> > James,> > LamManufacturerents is the foreign key in Lampent. LamManufacturerents exists in Lampent. So the query should be like this:> > > @NamedQuery(name ="getAlldetails", query=" SELECT l.pnumb, l.catergory, l.lwoltage, lm.manuname FROM Lampent l LEFT OUTER JOIN lm.LamManufacturerent lm")> > But i get the following errors:> > [#|2007-12-03T21:18:31.671+0000|INFO|sun-appserver9.1|oracle.toplink.essentials.session.file:/C:/Sun/SDK/domains/domain1/applications/j2ee-apps/LIGHTINGSPEC/LIGHTINGSPEC-ejb_jar/-LIGHTINGSPEC-ejbPU3|_ThreadID=34;_ThreadName=Thread-185;|file:/C:/Sun/SDK/domains/domain1/applications/j2ee-apps/LIGHTINGSPEC/LIGHTINGSPEC-ejb_jar/-LIGHTINGSPEC-ejbPU3 logout successful|#]> > [#|2007-12-03T21:18:31.687+0000|SEVERE|sun-appserver9.1|javax.enterprise.system.tools.deployment|_ThreadID=34;_ThreadName=Thread-185;_RequestID=3961ec6a-8774-47c5-876a-b986184d7369;|Exception occured in J2EEC Phase> java.lang.StackOverflowError> at java.util.HashMap.get(HashMap.java:300)> at oracle.toplink.essentials.internal.parsing.ParseTreeContext.pathForVariable(ParseTreeContext.java:198)> at oracle.toplink.essentials.internal.parsing.VariableNode.resolveClass(VariableNode.java:282)> at oracle.toplink.essentials.internal.parsing.DotNode.resolveClass(DotNode.java:262)> at oracle.toplink.essentials.internal.parsing.VariableNode.resolveClass(VariableNode.java:287)> at oracle.toplink.essentials.internal.parsing.DotNode.resolveClass(DotNode.java:262)> at oracle.toplink.essentials.internal.parsing.VariableNode.resolveClass(VariableNode.java:287)> at oracle.toplink.essentials.internal.parsing.DotNode.resolveClass(DotNode.java:262)> at oracle.toplink.essentials.internal.parsing.VariableNode.resolveClass(VariableNode.java:287)> > > .............................> > > it gos on.> > Thankings everyone> > eve> > ----------------------------------------> > Date: Mon, 3 Dec 2007 07:08:22 -0800> > From: jamesssss@yahoo.com> > To: persistence@glassfish.dev.java.net> > Subject: RE: question on entity relationships> > > > > > Do you have any LamManufacturerent that have Lampent? This query will filter> > out the none case, i.e. you will only get back LamManufacturerents that have> > 1 or more Lampent.> > > > You could use an outerjoin if you do not wish to filter the none case.> > > > i.e.> > SELECT l.pnumb, l.catergory, l.lwoltage, lm.manuname FROM LamManufacturerent> > lm left outer join lm.lampent l> > > > > > Eve Pokua wrote:> > > > > > > > > Hello James/Everyone, I have finally tried your suggestion but I'm> > > having problems retrieving data. Below are my to related entities with> > > their relationships: @Entity@Table(name="LAMPS") @Named Queries({> > > @Named Query(name ="getAlldetails", query=" SELECT l.pnumb, l.catergory,> > > l.lwoltage, lm.manuname FROM LamManufacturerent lm, in(lm.lampent) l")}> > > public class Lampent implements Serializable{ ......................... > > > @ManyToOne private LamManufacturerent> > > lamManufacturerent;................... } @Entity@Table(name="LAMPMANU")> > > public class LamManufacturerent implements> > > Serializable{............................ @OneToMany(mappedBy => > > "lamManufacturerent") private List<Lampent> lampent; .............> > > } Here is the JPQL: @Named Query(name ="getAlldetails", query=" SELECT> > > l.pnumb, l.catergory, l.lwoltage, lm.manuname FROM LamManufacturerent lm,> > > in(lm.lampent) l") Did I get it wrong because it is not working and not> > > retrieving any data. It however works, if I do some thing like this:> > > "Select l FROM Lampent l" It brings all data plus all the data from the> > > related entity LamManufacturerent. But i only want manuname from> > > LamManufacturerent. Im probably making just a little mistake. Please,> > > help. Thankseve ________________________________> From:> > > gorgeous65@msn.com> To: persistence@glassfish.dev.java.net> Date: Wed, 14> > > Nov 2007 15:07:03 +0000> Subject: RE: question on entity relationships> >> > > Thanks James> > I will try it and let you know.> > eve> >> Date: Wed, 14> > > Nov 2007 06:20:25 -0800>> From: jamesssss@yahoo.com>> To:> > > persistence@glassfish.dev.java.net>> Subject: Re: question on entity> > > relationships>>>>>> The JPQL would be,>>>> "Select i.id, i.name,> > > i.description, i.colour, i.size, o.oid, o.date,>> o.quantity from Order o,> > > in(o.items) i">>>> You could also just select the Order and fetch join the> > > items, if you wanted>> the objects back. Or just select the Orders can> > > access the items from them>> in Java.>>>> "Select o from Order o join> > > fetch o.items">>>> "Select o from Order o">>>>>> Eve Pokua wrote:>>>>>>>>>> > > Hello everyone,>>>>>> I would like to know how to retrieve certain data> > > from the DB with respect>>> to entity relationship. Consider the following> > > SQL statement.>>>>>> "Select i.id, i.name, i.description, i.colour,> > > i.size, o.oid, o.date,>>> o.quantity from Item i, Order o">>>>>> Or a very> > > complex SQL statement using JOIN in tables.>>>>>> The Order entity is a 1> > > to many relation to Item - an order can have many>>> items. But when> > > retrieving the details from order, I want to see certain>>> data from the> > > Order table as stated above, but not all the data from>>> Order. How do I> > > achieve this in EJB3 query?>>>>>> Thanks>>>>>> eve>>>>>>>>> ----->> --->>> > >
http://wiki.eclipse.org/User:James.sutherland.oracle.com James> > > Sutherland>>
http://www.oracle.com/technology/products/ias/toplink/ Oracle> > > TopLink ,>>
http://www.eclipse.org/eclipselink/>> EclipseLink ,> > >
https://glassfish.dev.java.net/javaee5/persistence/ TopLink>> Essentials>>> > > Wiki:
http://en.wikibooks.org/wiki/Java_Persistence Java Persistence ,>>> > >
http://wiki.eclipse.org/EclipseLink EclipseLink>> Forums:> > >
http://forums.oracle.com/forums/forum.jspa?forumID=48 TopLink ,>>> > >
http://www.nabble.com/EclipseLink-f26430.html EclipseLink ,>>> > >
http://www.nabble.com/java.net---glassfish-persistence-f13455.html> > > Glassfish>> Persistence>> -->> View this message in context:> > >
http://www.nabble.com/question-on-entity-relationships-tf4804935.html#a13747259>>> > > Sent from the java.net - glassfish persistence mailing list archive at> > > Nabble.com.> > ________________________________> Get free emoticon packs> > > and customisation from Windows Live. Pimp My> > > Live!<
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http://wiki.eclipse.org/User:James.sutherland.oracle.com James Sutherland > >
http://www.oracle.com/technology/products/ias/toplink/ Oracle TopLink , > >
http://www.eclipse.org/eclipselink/> > EclipseLink ,
https://glassfish.dev.java.net/javaee5/persistence/ TopLink> > Essentials > > Wiki:
http://en.wikibooks.org/wiki/Java_Persistence Java Persistence , > >
http://wiki.eclipse.org/EclipseLink EclipseLink > > Forums:
http://forums.oracle.com/forums/forum.jspa?forumID=48 TopLink , > >
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