xdev.db

Class NullDBDataSource

java.lang.Object

xdev.util.AbstractDataSource<T>

xdev.db.AbstractDBDataSource<NullDBDataSource>

xdev.db.NullDBDataSource

All Implemented Interfaces:

DBDataSource<NullDBDataSource>, DataSource<NullDBDataSource>

public class NullDBDataSource
extends AbstractDBDataSource<NullDBDataSource>

An empty dummy data source which returns empty results.

Since:

3.2

Author:

XDEV Software

Nested Class Summary

Nested classes/interfaces inherited from interface xdev.util.DataSource

DataSource.Parameter<T>

Field Summary

Fields

Modifier and Type	Field and Description
static NullDBDataSource	instance

Fields inherited from class xdev.db.AbstractDBDataSource

AUTH_KEY, CATALOG, CONNECTION_POOL_SIZE, EMBEDDED, HOST, IS_SERVER_DATASOURCE, KEEP_CONNECTIONS_ALIVE, listeners, PASSWORD, PORT, SCHEMA, SERVER_URL, URL_EXTENSION, USERNAME, VERBOSE

Fields inherited from class xdev.util.AbstractDataSource

connConfig, params

Constructor Summary

Constructors

Constructor and Description
NullDBDataSource()

Method Summary

Modifier and Type	Method and Description
boolean	canExport() Determines if this data source is able to create or alter tables in the database.
void	clearCaches() Clears all caches of this data source.
void	closeAllOpenConnections() Close all open connections.
DataSource.Parameter[]	getDefaultParameters()
DBMetaData	getMetaData()
protected DBConnection	openConnectionImpl()

Methods inherited from class xdev.db.AbstractDBDataSource

addDBDataSourceListener, getAuthKey, getCatalog, getConnectionPoolSize, getDBDataSourceListeners, getHost, getPassword, getPort, getSchema, getServerURL, getUrlExtension, getUserName, isEmbedded, isParameterRequired, isServerDataSource, keepConnectionsAlive, openConnection, removeDBDataSourceListener, setAuthKey, setUrlExtension

Methods inherited from class xdev.util.AbstractDataSource

getDefaultParameter, getName, getParameter, getParameter, getParameters, getParameterValue, getParameterValue, init, init, putParameter, putParameter, putParameterValue, putParameterValue, rankParams, setName

Methods inherited from class java.lang.Object

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

Methods inherited from interface xdev.util.DataSource

getDefaultParameter, getName, getParameter, getParameters, getParameterValue, getParameterValue, putParameter

Field Detail

instance

public static final NullDBDataSource instance

Constructor Detail

NullDBDataSource

public NullDBDataSource()

Method Detail

getDefaultParameters

public DataSource.Parameter[] getDefaultParameters()

getMetaData

public DBMetaData getMetaData()
                       throws DBException

Description copied from interface: DBDataSource

Throws:

DBException

openConnectionImpl

protected DBConnection openConnectionImpl()
                                   throws DBException

Specified by:

openConnectionImpl in class AbstractDBDataSource<NullDBDataSource>

Throws:

DBException

closeAllOpenConnections

public void closeAllOpenConnections()
                             throws DBException

Description copied from interface: DBDataSource

Close all open connections.

Throws:

DBException - if a database access error occurs

canExport

public boolean canExport()

Description copied from interface: DBDataSource

Determines if this data source is able to create or alter tables in the database.

clearCaches

public void clearCaches()

Description copied from interface: DataSource

Clears all caches of this data source.

This method should be called after a parameter's value is changed if the data source has been used before.