Hi friends,

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



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



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


Regards
Srini

T

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

1. First, use LAZY associations, not EAGER because EAGER is almost always a bad choice.



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