Hi everybody,

This may be the easy question for many of you but not for me :)

I have some POJO class with an id attribute. For example

public class Continent {

private String continentName;

private Long id;
public Continent() {
}

public String getContinentName() {
return continentName;
}

public void setContinentName(String val) {
this.continentName = val;
}

public Long getId() {
return id;
}

private void setId(Long val) {
this.id = val;

}
}

Before I save this object into database, I want to check if object is already in database (saved). Is there any easy way of getting this information?

It depends on that information if object is to be saved or not, because I want to obtain an UNIQUE constraint in my database.

Please help me

Regards

You could implement a getContinent(String c) which would perform a query ("from Continent where continentName=?"). If there's an instance it would return it and if it's not it would create it and save it into the session. Then you would make Continent constructor non-public (ie. package private, you can't make it private).

Well if you have for assigned class some generator, sequence or identity you could check if it's id is null or not. So if it's null it' not saved. If it' not null , then it's probably saved but you could try to load it using that id just to be sure.
Pozdrav iz Srbije!