net.sf.jasperreports.engine.data

Class JRJpaDataSource

java.lang.Object

net.sf.jasperreports.engine.data.JRAbstractBeanDataSource

net.sf.jasperreports.engine.data.JRJpaDataSource

All Implemented Interfaces:

JRDataSource, JRRewindableDataSource

public class JRJpaDataSource
extends JRAbstractBeanDataSource

Java Persistence API data source that uses javax.persistence.Query.getResultList().

The query result can be paginated by not retrieving all the rows at once.

Fields are mapped to values in the result following these rules:

• if the query returns a single object/bean (e.g. SELECT m FROM Movie m or SELECT NEW MovieDescription(m.title, m.genre) FROM Movie m), then the fields are mapped to bean property names.
• if the query returns multiple objects per row (e.g. SELECT m.title, m.gender FROM Movie m), the fields are mapped using the following syntax: COLUMN_index[.property], with the indexes starting from 1. Example mappings: COLUMN_1, COLUMN_2, COLUMN_2.title, COLUMN_2.movie.title.

Author:

Marcel Overdijk (marceloverdijk@hotmail.com)

See Also:

JRJpaQueryExecuterFactory.PROPERTY_JPA_QUERY_PAGE_SIZE

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
protected static interface	JRJpaDataSource.FieldValueReader
protected class	JRJpaDataSource.IndexPropertyReader
protected class	JRJpaDataSource.IndexReader
protected class	JRJpaDataSource.PropertyReader

Field Summary

Fields

Modifier and Type	Field and Description
protected Object	currentRow

Fields inherited from class net.sf.jasperreports.engine.data.JRAbstractBeanDataSource

CURRENT_BEAN_MAPPING, FIELD_DESCRIPTION_PROPERTY_NAME_PROVIDER, FIELD_NAME_PROPERTY_NAME_PROVIDER, propertyNameProvider

Constructor Summary

Constructors

Constructor and Description
JRJpaDataSource(JRJpaQueryExecuter queryExecuter, int pageSize)

Method Summary

Methods

Modifier and Type	Method and Description
protected void	fetchPage()
Object	getFieldValue(JRField field) Gets the field value for the current position.
protected JRJpaDataSource.FieldValueReader	getFieldValueReader(JRField field)
void	moveFirst() Moves back to the first element in the data source.
boolean	next() Tries to position the cursor on the next element in the data source.

Methods inherited from class net.sf.jasperreports.engine.data.JRAbstractBeanDataSource

getBeanProperty, getFieldValue, getPropertyName, isCurrentBeanMapping

Methods inherited from class java.lang.Object

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

Field Detail

currentRow

protected Object currentRow

Constructor Detail

JRJpaDataSource

public JRJpaDataSource(JRJpaQueryExecuter queryExecuter,
               int pageSize)

Method Detail

fetchPage

protected void fetchPage()

next

public boolean next()

Description copied from interface: JRDataSource

Tries to position the cursor on the next element in the data source.

Returns:

true if there is a next record, false otherwise

moveFirst

public void moveFirst()

Description copied from interface: JRRewindableDataSource

Moves back to the first element in the data source.

getFieldValue

public Object getFieldValue(JRField field)
                     throws JRException

Description copied from interface: JRDataSource

Gets the field value for the current position.

Returns:

an object containing the field value. The object type must be the field object type.

Throws:

JRException

getFieldValueReader

protected JRJpaDataSource.FieldValueReader getFieldValueReader(JRField field)