JRJpaDataSource (JasperReports 6.21.0 API)

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	Description
`protected static interface`	`JRJpaDataSource.FieldValueReader`
`protected class`	`JRJpaDataSource.IndexPropertyReader`
`protected class`	`JRJpaDataSource.IndexReader`
`protected class`	`JRJpaDataSource.PropertyReader`

Nested classes/interfaces inherited from class net.sf.jasperreports.engine.data.JRAbstractBeanDataSource
JRAbstractBeanDataSource.DefaultPropertyNameProvider

Field Summary

Fields
Modifier and Type Field Description

protected java.lang.Object currentRow

static java.lang.String EXCEPTION_MESSAGE_KEY_INDEX_OUT_OF_BOUNDS
- Fields inherited from class net.sf.jasperreports.engine.data.JRAbstractBeanDataSource
  CURRENT_BEAN_MAPPING, EXCEPTION_MESSAGE_KEY_BEAN_FIELD_VALUE_NOT_RETRIEVED, PROPERTY_JAVABEAN_FIELD_PROPERTY, propertyNameProvider

Constructor Summary

Constructors
Constructor Description

JRJpaDataSource(JRJpaQueryExecuter queryExecuter, int pageSize)

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`protected void`	`fetchPage()`
`java.lang.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
  - EXCEPTION_MESSAGE_KEY_INDEX_OUT_OF_BOUNDS
```
public static final java.lang.String EXCEPTION_MESSAGE_KEY_INDEX_OUT_OF_BOUNDS
```
    See Also:
    
    Constant Field Values
  - currentRow
```
protected java.lang.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 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)
```