org.hsqldb.jdbc
Class JDBCDataSource

java.lang.Object
  org.hsqldb.jdbc.JDBCCommonDataSource
      org.hsqldb.jdbc.JDBCDataSource

All Implemented Interfaces:

Serializable, Wrapper, Referenceable, CommonDataSource, DataSource

public class JDBCDataSource
extends JDBCCommonDataSource
implements DataSource, Serializable, Referenceable, Wrapper

A factory for connections to the physical data source that this DataSource object represents. An alternative to the DriverManager facility, a DataSource object is the preferred means of getting a connection. An object that implements the DataSource interface will typically be registered with a naming service based on the Java^TM Naming and Directory (JNDI) API.

The DataSource interface is implemented by a driver vendor. There are three types of implementations:

1. Basic implementation -- produces a standard Connection object
2. Connection pooling implementation -- produces a Connection object that will automatically participate in connection pooling. This implementation works with a middle-tier connection pooling manager.
3. Distributed transaction implementation -- produces a Connection object that may be used for distributed transactions and almost always participates in connection pooling. This implementation works with a middle-tier transaction manager and almost always with a connection pooling manager.

A DataSource object has properties that can be modified when necessary. For example, if the data source is moved to a different server, the property for the server can be changed. The benefit is that because the data source's properties can be changed, any code accessing that data source does not need to be changed.

A driver that is accessed via a DataSource object does not register itself with the DriverManager. Rather, a DataSource object is retrieved though a lookup operation and then used to create a Connection object. With a basic implementation, the connection obtained through a DataSource object is identical to a connection obtained through the DriverManager facility.

HSQLDB-Specific Information:

This implementation of data source is a basic implementation and does not perform connection pooling.

The getter and setter methods of the parent class, JDBCCommonDataSource, can be used.

Since:

JDK 1.4, 1.7.2

Author:

Campbell Boucher-Burnet (boucherb@users dot sourceforge.net), Fred Toussi (fredt@users dot sourceforge.net)

See Also:

Serialized Form

Constructor Summary

JDBCDataSource()

Method Summary

Connection	getConnection() Retrieves a new connection using the properties that have already been set.
Connection	getConnection(String username, String password) Retrieves a new connection using the given username and password, and the database url that has been set.
Reference	getReference() Retrieves the Reference of this object.
boolean	isWrapperFor(Class<?> iface) Returns true if this either implements the interface argument or is directly or indirectly a wrapper for an object that does.
<T> T	unwrap(Class<T> iface) Returns an object that implements the given interface to allow access to non-standard methods, or standard methods not exposed by the proxy.

Methods inherited from class org.hsqldb.jdbc.JDBCCommonDataSource

getDatabase, getDatabaseName, getDataSourceName, getDescription, getLoginTimeout, getLogWriter, getNetworkProtocol, getParentLogger, getServerName, getUrl, getUser, setDatabase, setDatabaseName, setLoginTimeout, setLogWriter, setPassword, setProperties, setUrl, setUser

Methods inherited from class java.lang.Object

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

Methods inherited from interface javax.sql.CommonDataSource

getLoginTimeout, getLogWriter, setLoginTimeout, setLogWriter

Constructor Detail

JDBCDataSource

public JDBCDataSource()

Method Detail

getConnection

public Connection getConnection()
                         throws SQLException

Retrieves a new connection using the properties that have already been set.

Specified by:

getConnection in interface DataSource

Returns:

a connection to the data source

Throws:

SQLException - if a database access error occurs

getConnection

public Connection getConnection(String username,
                                String password)
                         throws SQLException

Retrieves a new connection using the given username and password, and the database url that has been set. No other properties are used for the connection

Specified by:

getConnection in interface DataSource

Parameters:

username - the database user on whose behalf the connection is being made

password - the user's password

Returns:

a connection to the data source

Throws:

SQLException - if a database access error occurs

unwrap

public <T> T unwrap(Class<T> iface)
         throws SQLException

Returns an object that implements the given interface to allow access to non-standard methods, or standard methods not exposed by the proxy. If the receiver implements the interface then the result is the receiver or a proxy for the receiver. If the receiver is a wrapper and the wrapped object implements the interface then the result is the wrapped object or a proxy for the wrapped object. Otherwise return the the result of calling unwrap recursively on the wrapped object or a proxy for that result. If the receiver is not a wrapper and does not implement the interface, then an SQLException is thrown.

Specified by:

unwrap in interface Wrapper

Parameters:

iface - A Class defining an interface that the result must implement.

Returns:

an object that implements the interface. May be a proxy for the actual implementing object.

Throws:

SQLException - If no object found that implements the interface

Since:

JDK 1.6, HSQLDB 2.0

isWrapperFor

public boolean isWrapperFor(Class<?> iface)
                     throws SQLException

Returns true if this either implements the interface argument or is directly or indirectly a wrapper for an object that does. Returns false otherwise. If this implements the interface then return true, else if this is a wrapper then return the result of recursively calling isWrapperFor on the wrapped object. If this does not implement the interface and is not a wrapper, return false. This method should be implemented as a low-cost operation compared to unwrap so that callers can use this method to avoid expensive unwrap calls that may fail. If this method returns true then calling unwrap with the same argument should succeed.

Specified by:

isWrapperFor in interface Wrapper

Parameters:

iface - a Class defining an interface.

Returns:

true if this implements the interface or directly or indirectly wraps an object that does.

Throws:

SQLException - if an error occurs while determining whether this is a wrapper for an object with the given interface.

Since:

JDK 1.6, HSQLDB 2.0

getReference

public Reference getReference()
                       throws NamingException

Retrieves the Reference of this object.

Specified by:

getReference in interface Referenceable

Returns:

The non-null Reference of this object.

Throws:

NamingException - If a naming exception was encountered while retrieving the reference.