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 Post subject: Hibernate save is updating foreign key table.
PostPosted: Fri Dec 08, 2017 6:09 am 
Newbie

Joined: Fri Dec 08, 2017 6:00 am
Posts: 4
Hi friends,

I am new to this forum and hibernate .I am having a problem with hibernate many to one mapping.

Code:
@ManyToOne(cascade = CascadeType.ALL,fetch = FetchType.EAGER)
   @JoinColumn(name = "DTE_ID")
   @NotNull
   private Dte raisedByDte;


This is the code iam using in main object and foreign key is DTE_ID.But when i am trying to save it is updating all fields in referance table .My referance object is as follows

Code:
@Entity
@Table(name = "DTE_MASTERS",  uniqueConstraints = @UniqueConstraint(columnNames = "DTE_NAME"))
public class Dte {
   
   @Id 
   @Column(name="DTE_ID", updatable = false, nullable = false)
   private int dte_id;
   @Column(name="DTE_NAME")
   private String dte_name;
   
   public Dte() {
      super();
      // TODO Auto-generated constructor stub
   }
   public Dte(int dte_id, String dte_name) {
      super();
      this.dte_id = dte_id;
      this.dte_name = dte_name;
   }
   public int getDte_id() {
      return dte_id;
   }
   public void setDte_id(int dte_id) {
      this.dte_id = dte_id;
   }
   public String getDte_name() {
      return dte_name;
   }
   public void setDte_name(String dte_name) {
      this.dte_name = dte_name;
   }


.i want to restrict update DTE_MASTERS when i am inserting ..can some body please guide me through this


Regards
Srini

T


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 Post subject: Re: Hibernate save is updating foreign key table.
PostPosted: Fri Dec 08, 2017 6:39 am 
Hibernate Team
Hibernate Team

Joined: Thu Sep 11, 2014 2:50 am
Posts: 1630
Location: Romania
Quote:
I want to restrict update DTE_MASTERS when i am inserting ..can some body please guide me through this


Can you try to rephrase it because it's not clear what you are asking.


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 Post subject: Re: Hibernate save is updating foreign key table.
PostPosted: Fri Dec 08, 2017 6:56 am 
Newbie

Joined: Fri Dec 08, 2017 6:00 am
Posts: 4
vlad wrote:
Quote:
I want to restrict update DTE_MASTERS when i am inserting ..can some body please guide me through this


Can you try to rephrase it because it's not clear what you are asking.


DTE_MASTERS IS A MASTERS TABLE and dte object is used as referance object many to one in base object.I do not want to do any thing with DTE_MASTERS.

just want to insert primary key vaue in main object which ia m trying insert new

@Proxy(lazy = false)
@Table(name = "MSMAN")
public class Msman {
@Id @GeneratedValue
@Column(name="MSAMN_ID")
private int msmanId;

@ManyToOne(cascade = CascadeType.ALL,fetch = FetchType.EAGER)
@JoinColumn(name = "DTE_ID")
@NotNull
private Dte raisedByDte;



public Dte getRaisedByDte() {
return raisedByDte;
}


public void setRaisedByDte(Dte raisedByDte) {
this.raisedByDte = raisedByDte;
}

}


now ia am creating am object msman.setraisedByDte(new Dte(4)); and trying to save msman object.

New row is being inserted in msman table.but it is updating all dte_masters field value to null except DTE_ID which is 4 (already existing).


Thanks in advance


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 Post subject: Re: Hibernate save is updating foreign key table.
PostPosted: Fri Dec 08, 2017 7:42 am 
Hibernate Team
Hibernate Team

Joined: Thu Sep 11, 2014 2:50 am
Posts: 1630
Location: Romania
1. First, use LAZY associations, not EAGER because EAGER is almost always a bad choice.

Code:
@ManyToOne(fetch = FetchType.LAZY)


2. Remove cascade = CascadeType.ALL from the @ManyToOne association because a child should never cascade to a parent entity.


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