Note: This ORM/SQL annotation is silently ignored by ObjectDB

240 words

javax.persistence.FieldResult - JPA annotation

javax.persistence
Annotation FieldResult

Target:
Is used to map the columns specified in the SELECT list of the query to the properties or fields of the entity class.

Example:

   Query q = em.createNativeQuery(
       "SELECT o.id AS order_id, " +
           "o.quantity AS order_quantity, " +
           "o.item AS order_item, " +
         "FROM Order o, Item i " +
         "WHERE (order_quantity > 25) AND (order_item = i.id)",
       "OrderResults");
 
   @SqlResultSetMapping(name="OrderResults",
       entities={
           @EntityResult(entityClass=com.acme.Order.class, fields={
               @FieldResult(name="id", column="order_id"),
               @FieldResult(name="quantity", column="order_quantity"),
               @FieldResult(name="item", column="order_item")})
       })
Since:
JPA 1.0
String column
Name of the column in the SELECT clause - i.e., column aliases, if applicable.
Name of the column in the SELECT clause - i.e., column aliases, if applicable.
Since:
JPA 1.0
String name
Name of the persistent field or property of the class.
Name of the persistent field or property of the class.
Since:
JPA 1.0

This documentation page is derived (with some adjustments) from the open source JPA 2 RI (EclipseLink)
and is available under the terms of the Eclipse Public License, v. 1.0 and Eclipse Distribution License, v. 1.0.
Object Relational Mapping (ORM) JPA 2 providers include Hibernate, EclipseLink, TopLink, OpenJPA and DataNucleus.
Object DB is not an ORM JPA implementation but an Object Database for Java with built in JPA 2 support.