net.sf.jasperreports.engine

Class JRResultSetDataSource

java.lang.Object

net.sf.jasperreports.engine.JRResultSetDataSource

All Implemented Interfaces:

JRDataSource

public class JRResultSetDataSource
extends Object
implements JRDataSource

This is a default implementation of the JRDataSource interface. Since most reports are generated using data from a relational database, JasperReports includes by default this implementation that wraps a java.sql.ResultSet object.

This class can be instantiated intentionally to wrap already loaded result sets before passing them to the report-filling routines, but it is also used by the reporting engine to wrap the data retrieved from the database after having executed the report query (if present) through JDBC.

Version:

$Id: JRResultSetDataSource.java 7199 2014-08-27 13:58:10Z teodord $

Author:

Teodor Danciu (teodord@users.sourceforge.net)

Field Summary

Fields

Modifier and Type	Field and Description
static String	INDEXED_COLUMN_PREFIX

Constructor Summary

Constructors

Constructor and Description
JRResultSetDataSource(JasperReportsContext jasperReportsContext, ResultSet resultSet)
JRResultSetDataSource(ResultSet resultSet)

Method Summary

Methods

Modifier and Type	Method and Description
protected String	clobToString(Clob clob)
protected Calendar	createFieldCalendar(JRField field)
protected CharArrayReader	getArrayReader(Reader reader, long size)
protected Calendar	getFieldCalendar(JRField field)
Object	getFieldValue(JRField field) Gets the field value for the current position.
boolean	next() Tries to position the cursor on the next element in the data source.
protected byte[]	readBytes(InputStream is, long size)
protected byte[]	readBytes(Integer columnIndex)
protected Object	readDate(Integer columnIndex, JRField field)
protected Object	readTime(Integer columnIndex, JRField field)
protected Object	readTimestamp(Integer columnIndex, JRField field)
protected Integer	searchColumnByLabel(String fieldName)
protected Integer	searchColumnByName(String fieldName)
void	setTimeZone(TimeZone timeZone, boolean override) Sets the default time zone to be used for retrieving date/time values from the result set.

Methods inherited from class java.lang.Object

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

Field Detail

INDEXED_COLUMN_PREFIX

public static final String INDEXED_COLUMN_PREFIX

See Also:

Constant Field Values

Constructor Detail

JRResultSetDataSource

public JRResultSetDataSource(JasperReportsContext jasperReportsContext,
                     ResultSet resultSet)

JRResultSetDataSource

public JRResultSetDataSource(ResultSet resultSet)

See Also:

JRResultSetDataSource(JasperReportsContext, ResultSet)

Method Detail

next

public boolean next()
             throws JRException

Description copied from interface: JRDataSource

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

Specified by:

next in interface JRDataSource

Returns:

true if there is a next record, false otherwise

Throws:

JRException - if any error occurs while trying to move to the next element

getFieldValue

public Object getFieldValue(JRField field)
                     throws JRException

Description copied from interface: JRDataSource

Gets the field value for the current position.

Specified by:

getFieldValue in interface JRDataSource

Returns:

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

Throws:

JRException

readDate

protected Object readDate(Integer columnIndex,
              JRField field)
                   throws SQLException

Throws:

SQLException

readTimestamp

protected Object readTimestamp(Integer columnIndex,
                   JRField field)
                        throws SQLException

Throws:

SQLException

readTime

protected Object readTime(Integer columnIndex,
              JRField field)
                   throws SQLException

Throws:

SQLException

searchColumnByName

protected Integer searchColumnByName(String fieldName)
                              throws SQLException

Throws:

SQLException

searchColumnByLabel

protected Integer searchColumnByLabel(String fieldName)
                               throws SQLException

Throws:

SQLException

clobToString

protected String clobToString(Clob clob)
                       throws JRException

Throws:

JRException

getArrayReader

protected CharArrayReader getArrayReader(Reader reader,
                             long size)
                                  throws IOException

Throws:

IOException

readBytes

protected byte[] readBytes(Integer columnIndex)
                    throws SQLException,
                           IOException

Throws:

SQLException

IOException

readBytes

protected byte[] readBytes(InputStream is,
               long size)
                    throws IOException

Throws:

IOException

setTimeZone

public void setTimeZone(TimeZone timeZone,
               boolean override)

Sets the default time zone to be used for retrieving date/time values from the result set. In most cases no explicit time zone conversion would be required for retrieving date/time values from the DB, and this parameter should be null.

Parameters:

timeZone - the default time zone

override - whether the default time zone overrides time zones specified as field-level properties

See Also:

JRJdbcQueryExecuterFactory.PROPERTY_TIME_ZONE

getFieldCalendar

protected Calendar getFieldCalendar(JRField field)

createFieldCalendar

protected Calendar createFieldCalendar(JRField field)