javax.persistence.ColumnResult Maven / Gradle / Ivy
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package javax.persistence;
import java.lang.annotation.Target;
import java.lang.annotation.Retention;
import static java.lang.annotation.RetentionPolicy.RUNTIME;
/**
* 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")}
* )
*
*
* @since Java Persistence 1.0
*/
@Target({})
@Retention(RUNTIME)
public @interface ColumnResult {
/** The name of a column in the SELECT clause of a SQL query */
String name();
}