org.eclipse.persistence.config
Class ResultType

java.lang.Object
  org.eclipse.persistence.config.ResultType

public class ResultType
extends java.lang.Object

Result type hint values. The class contains all the valid values for QueryHints.RESULT_TYPE query hint. By default in JPA for non-single select queries an Array of values is returned. If getSingleResult() is called the first array is returned, for getResultList() a List of arrays is returned.

i.e. "Select e.firstName, e.lastName from Employee e" returns List

or the native query, "SELECT * FROM EMPLOYEE" returns List

The ResultType can be used to instead return a Map of values (DatabaseRecord, ReportQueryResult).

It can also be used to return a single column, or single value. JPA Query Hint Usage:

query.setHint(QueryHints.RESULT_TYPE, ResultType.Map);

or

@QueryHint(name=QueryHints.RESULT_TYPE, value=ResultType.Map)

Hint values are case-insensitive. "" could be used instead of default value ResultType.Array.

See Also:

QueryHints.RESULT_TYPE, Record, DatabaseRecord, ReportQueryResult, ReportQuery.setReturnType(int), org.eclipse.persistence.queries.DataReadQuery#setUseAbstractRecord(boolean)

Author:

James Sutherland

Field Summary

static java.lang.String	Array An Object array of values is returned (List or Object[]).
static java.lang.String	Attribute A List of the first selected value is returned.
static java.lang.String	DEFAULT The default type is Array.
static java.lang.String	Map A Map of key value pairs is returned.
static java.lang.String	Value The first value of the first rows is returned.

Constructor Summary

ResultType()

Method Summary

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

Array

public static final java.lang.String Array

An Object array of values is returned (List or Object[]).

See Also:

Constant Field Values

Map

public static final java.lang.String Map

A Map of key value pairs is returned. For a native queries the keys are the column names, (List, or DatabaseRecord). For JPQL queries the keys are the attribute names, (List, or ReportQueryResult).

See Also:

Constant Field Values

Attribute

public static final java.lang.String Attribute

A List of the first selected value is returned.

See Also:

Constant Field Values

Value

public static final java.lang.String Value

The first value of the first rows is returned.

See Also:

Constant Field Values

DEFAULT

public static final java.lang.String DEFAULT

The default type is Array.

See Also:

Constant Field Values

Constructor Detail

ResultType

public ResultType()