ColumnResult (Java EE 5 SDK)

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Java EE 5 SDK

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SUMMARY: REQUIRED | OPTIONAL

DETAIL: ELEMENT

javax.persistence
Annotation Type ColumnResult

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

References name of a column in the SELECT clause of a SQL query - i.e., column alias, if applicable. Scalar result types can be included in the query result by specifying this annotation in the metadata.

 Example:
 Query q = em.createNativeQuery(
 "SELECT o.id AS order_id, " +
 "o.quantity AS order_quantity, " +
 "o.item AS order_item, " + 
 "i.name AS item_name, " +
 "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")})},
 columns={
 @ColumnResult(name="item_name")}
 )