FieldResult (Java EE 5 SDK)

Java

Java EE 5 SDK

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javax.persistence Annotation Type FieldResult


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

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")})
       })
 

从以下版本开始:
Java Persistence 1.0

Required Element Summary
 String column
          Name of the column in the SELECT clause - i.e., column aliases, if applicable.
 String name
          Name of the persistent field or property of the class.
 

元素详细信息

name

public abstract String name
Name of the persistent field or property of the class.


column

public abstract String column
Name of the column in the SELECT clause - i.e., column aliases, if applicable.


Java EE 5 SDK

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