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.
- Version:
- $Id: JRJpaDataSource.java 5180 2012-03-29 13:23:12Z teodord $
- Author:
- Marcel Overdijk (marceloverdijk@hotmail.com)
- See Also:
JRJpaQueryExecuterFactory.PROPERTY_JPA_QUERY_PAGE_SIZE
Field Summary |
protected java.lang.Object |
currentRow
|
Methods inherited from class java.lang.Object |
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
currentRow
protected java.lang.Object currentRow
JRJpaDataSource
public JRJpaDataSource(JRJpaQueryExecuter queryExecuter,
int pageSize)
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 java.lang.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)
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