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illusion
 Post subject: how to hql query a composite primary key
PostPosted: Tue Sep 18, 2007 11:37 pm 
Newbie

Joined: Tue Apr 11, 2006 4:57 pm
Posts: 13
Hey,

My question is how to query in HQL a composite primary key using
@EmbeddedId.

I have the embeddable class ClubPk:
___________________________________________________________
@Embeddable
public class NamePk implements Serializable{

String FirstName;
String LastName;.............
___________________________________________________________

And the class where it is embedded as the composite primary key:
__________________________________________________________

public class Group implements Serializable {

NamePk CompKey;
..........

public Group(){}

@EmbeddedId
public NamePk getCompKey()
{
return this.CompKey;
} ...........
_____________________________________________________________
When I try HQL query such as :

String querystring ="from Group group where group.firstName='"+var1+"' and group.lastName='"+var2+"'";
The columns firstname is not found.

How to query fields of a composite key?
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hutorny
 Post subject: Re: how to hql query a composite primary key
PostPosted: Wed Sep 19, 2007 2:47 am 
Beginner
Beginner

Joined: Mon Aug 27, 2007 8:10 am
Posts: 37
illusion wrote:
Hey,

My question is how to query in HQL a composite primary key using
@EmbeddedId.

I have the embeddable class ClubPk:
___________________________________________________________
@Embeddable
public class NamePk implements Serializable{

String FirstName;
String LastName;.............
___________________________________________________________

And the class where it is embedded as the composite primary key:
__________________________________________________________

public class Group implements Serializable {

NamePk CompKey;
..........

public Group(){}

@EmbeddedId
public NamePk getCompKey()
{
return this.CompKey;
} ...........
_____________________________________________________________
When I try HQL query such as :

String querystring ="from Group group where group.firstName='"+var1+"' and group.lastName='"+var2+"'";
The columns firstname is not found.

How to query fields of a composite key?


This way worked for us:
Code:
String querystring ="from Group group where group.NamePK = ('"+var1+"','"+var2+"')";
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illusion
 Post subject: thanks
PostPosted: Wed Sep 19, 2007 10:36 am 
Newbie

Joined: Tue Apr 11, 2006 4:57 pm
Posts: 13
Hey,

Thanks, works great.
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illusion
 Post subject: individual field of composite key
PostPosted: Wed Sep 19, 2007 10:59 am 
Newbie

Joined: Tue Apr 11, 2006 4:57 pm
Posts: 13
Hey,

Is there a way to query individual fields of a composite key. I find with the way stated every field of the key must be specified. If I wanted to query just one field of say a 3 field key how to get around it.

thanks in advance for your assistance
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hutorny
 Post subject: Re: individual field of composite key
PostPosted: Wed Sep 19, 2007 2:24 pm 
Beginner
Beginner

Joined: Mon Aug 27, 2007 8:10 am
Posts: 37
illusion wrote:
Hey,

Is there a way to query individual fields of a composite key. I find with the way stated every field of the key must be specified. If I wanted to query just one field of say a 3 field key how to get around it.

thanks in advance for your assistance


Try this. Folks saying it should work.

Code:
String querystring ="from Group group where group.NamePK.FirstName = 'myname'";
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murilorl
 Post subject: Re: individual field of composite key
PostPosted: Mon Oct 29, 2007 12:04 pm 
Newbie

Joined: Mon Oct 29, 2007 11:50 am
Posts: 5
hutorny wrote:
illusion wrote:
Hey,

Is there a way to query individual fields of a composite key. I find with the way stated every field of the key must be specified. If I wanted to query just one field of say a 3 field key how to get around it.

thanks in advance for your assistance


Try this. Folks saying it should work.

Code:
String querystring ="from Group group where group.NamePK.FirstName = 'myname'";


Hi, i'm trying to do this, but i still cant.
Look at my classes

Code:
@Embeddable
public class CustomerPK implements Serializable {

   private static final long serialVersionUID = 314150377756575581L;
   private long id;
   private long dId;
   private int wId;


   @Column(name = "C_ID", nullable = false)
   public long getId() {
      return id;
   }

   public void setId(long id) {
      this.id = id;
   }

   @Column(name = "C_D_ID", nullable = false)
   public long getDId() {
      return dId;
   }

   public void setDId(long id) {
      dId = id;
   }

   @Column(name = "C_W_ID", nullable = false)
   public int getWId() {
      return wId;
   }
                ...


Code:
@Entity
@Table(name = "CUSTOMER")
@NamedQueries({
   @NamedQuery(name = "selectAllCustomers", query = "select c from Customer c"),
   @NamedQuery(name = "countAllCustomers", query = "select count(*) from Customer c"),
   @NamedQuery(name = "deleteAllCustomers", query = "delete from Customer c"),
   @NamedQuery(name = "getCustomerByLastNameAndHomeWarehouse", query = "from " +
         "Customer c where c.cPk.dId=:dId and c.cPk.wId=:wId and c.last=:last")
})
public class Customer implements Serializable {

   
   private static final long serialVersionUID = -6640493644418267201L;
   private CustomerPK cPk;
                ...
   private String last;
                ...
   @EmbeddedId
   @AttributeOverrides({
      @AttributeOverride(name="id", column=@Column(name="C_ID", nullable = false)),
      @AttributeOverride(name="dId", column=@Column(name="C_D_ID", nullable = false)),
      @AttributeOverride(name="wId", column=@Column(name="C_W_ID", nullable = false))
   })
   public CustomerPK getCPk() {
      return cPk;
   }
                ....


When i try to obtain an EntityManagerFactory, un exception raises:
ERROR [main] (Log4JLogger.java:119) - Error in named query: getCustomerByLastNameAndHomeWarehouse
org.hibernate.QueryException: could not resolve property: cPK of: br.ufpr.***.Customer [from br.ufpr.***.Customer c where c.cPK.dId=:dId and c.cPk.wId=:wId and c.last=:last]

Does anyone knows why is this happening?

Thks.

Murilo
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hutorny
 Post subject: Re: individual field of composite key
PostPosted: Wed Oct 31, 2007 7:57 am 
Beginner
Beginner

Joined: Mon Aug 27, 2007 8:10 am
Posts: 37
murilorl wrote:

Hi, i'm trying to do this, but i still cant.
Look at my classes
Murilo


Try to remove alias 'c'

Code:
   @NamedQuery(name = "getCustomerByLastNameAndHomeWarehouse", query = "from " +
         "Customer where cPk.dId=:dId and cPk.wId=:wId and last=:last")
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