hibernate and default value

[Mathias Nilsson]

I have a column set up of id, item_id, logo and imagetype. Now I want to add a isDefault value that is used to get the first image for an item. An item can have many images but only one default per imagetype.

itemId and imagetype together can only have one isDefault set to 1 the rest should be o for isDefault. Is there anyway of doing this with Hibernate? This is what I got so far.

package dto.pres;
 
import javax.persistence.CascadeType;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.Id;
import javax.persistence.JoinColumn;
import javax.persistence.OneToOne;
import javax.persistence.Table;
 
import dto.Item;
 
@Entity
@Table( name = "ITEM_PRESENTATION" )
public class ItemPresentation {

public enum ImageType {
OVERVIEW,
ITEM,
SMALL,
}

@Id
@GeneratedValue
@Column( name = "id" )
private Long id;

//FIXME: The ANT tool that generates the MySQL schema makes 
// the foreign key restricted, not cascading!
@OneToOne( cascade = CascadeType.ALL ) 
@JoinColumn(name="item_fk")
private Item item;

@Column( name = "imageType", nullable = false )
private ImageType imageType;

@Column( name = "logoLink", nullable = false )
private String logoLink;

public ItemPresentation() {

}

public ItemPresentation( Item i ) {
item = i;
}
 
public Long getId() {
return id;
}
 
public void setId(Long id) {
this.id = id;
}
 
public ImageType getImageType() {
return imageType;
}
 
public void setImageType(ImageType imageType) {
this.imageType = imageType;
}
 
public Item getItem() {
return item;
}
 
public void setItem(Item item) {
this.item = item;
}
 
public String getLogoLink() {
return logoLink;
}
 
public void setLogoLink(String logoLink) {
this.logoLink = logoLink;
}
}
 

[Chandra Sekhar]

I'm not sure whether this will solve your problem.

To set default value to a column , I had done like this before.

<property name="price" type="string" formula="CASE WHEN (COALESCE(ITEM_CST,0) = 0) THEN ' ' ELSE CHAR(ITEM_CST) END"/>