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 3438 2010-02-18 14:39:36Z 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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