javax.persistence

Annotation Type ColumnResult

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

Used in conjunction with the SqlResultSetMapping annotation or ConstructorResult annotation to map a column of the SELECT list of a SQL query.

The name element references the name of a column in the SELECT list — 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")}
       )
 

See Also:

SqlResultSetMapping

Since:

Java Persistence 1.0

Required Element Summary

Required Elements

Modifier and Type	Required Element and Description
java.lang.String	name (Required) The name of a column in the SELECT clause of a SQL query

Optional Element Summary

Optional Elements

Modifier and Type	Optional Element and Description
java.lang.Class	type (Optional) The Java type to which the column type is to be mapped.

Element Detail

name

public abstract java.lang.String name

(Required) The name of a column in the SELECT clause of a SQL query

type

public abstract java.lang.Class type

(Optional) The Java type to which the column type is to be mapped. If the type element is not specified, the default JDBC type mapping for the column will be used.

Since:

Java Persistence 2.1

Default:

void.class