CODEWITHSUNDEEP
javahibernate
Artur Joshi
Artur Joshi

Reputation: 75

How to map detached Collection(List, Set) or Map with Hibernate via annotations

I know, that there is a way to map Map via XML:

 <set name="images"
 table="ITEM_IMAGE"
 order-by="IMAGENAME asc">
 <key column="ITEM_ID"/>
 <composite-element class="Image">
 <property name="name" column="IMAGENAME" not-null="true"/>
 <property name="filename" column="FILENAME" not-null="true"/>
 <property name="sizeX" column="SIZEX" not-null="true"/>
 <property name="sizeY" column="SIZEY" not-null="true"/>
 </composite-element>
</set>

Is there way to do the same thing via annotations mapping, and how to persist it into separate table?

Thatks a lot!

Upvotes: 2

Views: 89

Answers (1)

Amer Qarabsa
Amer Qarabsa

Reputation: 6574

For composite values or basic types it should be almost the same, first you need to tell hibernate that we are mapping to a collection then specify the name of the table which should hold your map and the join column with your current entity , then you specify the key.

         @Entity
         public class Item {
              @Id
              @GeneratedValue(strategy = GenerationType.AUTO)
              @Column(name = "Item_ID")
               private Long itemId;

              @ElementCollection
              @CollectionTable(name="ITEM_IMAGE",     joinColumns=@JoinColumn(name="ITEM_ID"))
              @MapKeyColumn(name="ITEM_ID")
              private Map<String, Image> contacts = new HashMap<String, Image>();
              }

              @Embeddable
              public class Image {
               //Specify your composite attributes with the column name for each
              }

hope I did not miss anything

Upvotes: 1

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