javax.persistence

Annotation Type EntityResult

@Target(value={})
@Retention(value=RUNTIME)
public @interface EntityResult

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:

Java Persistence 1.0

Required Element Summary

Required Elements

Modifier and Type	Required Element and Description
java.lang.Class	entityClass The class of the result.

Optional Element Summary

Optional Elements

Modifier and Type	Optional Element and Description
java.lang.String	discriminatorColumn Specifies the column name (or alias) of the column in the SELECT list that is used to determine the type of the entity instance.
FieldResult[]	fields Maps the columns specified in the SELECT list of the query to the properties or fields of the entity class.

Element Detail

entityClass

public abstract java.lang.Class entityClass

The class of the result.

fields

public abstract FieldResult[] fields

Maps the columns specified in the SELECT list of the query to the properties or fields of the entity class.

Default:

{}

discriminatorColumn

public abstract java.lang.String discriminatorColumn

Specifies the column name (or alias) of the column in the SELECT list that is used to determine the type of the entity instance.

Default:

""