JPA Annotation

EntityResult

Implemented Interfaces:
Annotation
Used in conjunction with the SqlResultSetMapping annotation to map the SELECT clause of a SQL query to an entity result.

If this annotation is used, the SQL statement should select all of the columns that are mapped to the entity object. This should include foreign key columns to related entities. The results obtained when insufficient data is available are undefined. 

Example:
   Query q = em.createNativeQuery(
       "SELECT o.id, o.quantity, o.item, i.id, i.name, i.description "+
           "FROM Order o, Item i " +
           "WHERE (o.quantity > 25) AND (o.item = i.id)",
       "OrderItemResults");
   @SqlResultSetMapping(name="OrderItemResults",
       entities={
           @EntityResult(entityClass=com.acme.Order.class),
           @EntityResult(entityClass=com.acme.Item.class)
   })
 
See Also:
SqlResultSetMapping
Since:
JPA 1.0
Public Annotation Attributes
String discriminatorColumn default ""
 Specifies the column name (or alias) of the column in the SELECT list that is used to determine the type of the entity instance.
 
Since:
JPA 1.0
Class entityClass default null
 The class of the result.
 
Since:
JPA 1.0
FieldResult[] fields default {}
 Maps the columns specified in the SELECT list of the query to the properties or fields of the entity class.
 
Since:
JPA 1.0