org.apache.derby.jdbc
Class EmbeddedDriver

java.lang.Object
  org.apache.derby.jdbc.EmbeddedDriver

All Implemented Interfaces:

java.sql.Driver

public class EmbeddedDriver

extends java.lang.Object

implements java.sql.Driver

The embedded JDBC driver (Type 4) for Cloudscape.

The driver automatically supports the correct JDBC specification version for the Java Virtual Machine's environment.

• JDBC 3.0 - Java 2 - JDK 1.4
• JDBC 2.0 - Java 2 - JDK 1.2,1.3

Loading this JDBC driver boots the database engine within the same Java virtual machine.

The correct code to load a Cloudscape engine using this driver is (with approriate try/catch blocks):

         Class.forName("org.apache.derby.jdbc.EmbeddedDriver").newInstance();

         // or

     new org.apache.derby.jdbc.EmbeddedDriver();


        

When loaded in this way, the class boots the actual JDBC driver indirectly. The JDBC specification recommends the Class.ForName method without the .newInstance() method call, but adding the newInstance() guarantees that Cloudscape will be booted on any Java Virtual Machine.

Any initial error messages are placed in the PrintStream supplied by the DriverManager. If the PrintStream is null error messages are sent to System.err. Once the Cloudscape engine has set up an error logging facility (by default to derby.log) all subsequent messages are sent to it.

By convention, the class used in the Class.forName() method to boot a JDBC driver implements java.sql.Driver. This class is not the actual JDBC driver that gets registered with the Driver Manager. It proxies requests to the registered Cloudscape JDBC driver.

See Also:

DriverManager, DriverManager.getLogStream(), Driver, SQLException

Constructor Summary

EmbeddedDriver()

Method Summary

boolean	acceptsURL(java.lang.String url) Accept anything that starts with jdbc:derby:.
java.sql.Connection	connect(java.lang.String url, java.util.Properties info) Connect to the URL if possible
int	getMajorVersion() Returns the driver's major version number.
int	getMinorVersion() Returns the driver's minor version number.
java.sql.DriverPropertyInfo[]	getPropertyInfo(java.lang.String url, java.util.Properties info) Returns an array of DriverPropertyInfo objects describing possible properties.
boolean	jdbcCompliant() Report whether the Driver is a genuine JDBC COMPLIANT (tm) driver.

Methods inherited from class java.lang.Object

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

Constructor Detail

EmbeddedDriver

public EmbeddedDriver()

Method Detail

acceptsURL

public boolean acceptsURL(java.lang.String url)
                   throws java.sql.SQLException

Accept anything that starts with jdbc:derby:.

Specified by:

acceptsURL in interface java.sql.Driver

Throws:

java.sql.SQLException - if a database-access error occurs.

See Also:

Driver

connect

public java.sql.Connection connect(java.lang.String url,
                                   java.util.Properties info)
                            throws java.sql.SQLException

Connect to the URL if possible

Specified by:

connect in interface java.sql.Driver

Throws:

java.sql.SQLException - illegal url or problem with connectiong

See Also:

Driver

getPropertyInfo

public java.sql.DriverPropertyInfo[] getPropertyInfo(java.lang.String url,
                                                     java.util.Properties info)
                                              throws java.sql.SQLException

Returns an array of DriverPropertyInfo objects describing possible properties.

Specified by:

getPropertyInfo in interface java.sql.Driver

Throws:

java.sql.SQLException - if a database-access error occurs.

See Also:

Driver

getMajorVersion

public int getMajorVersion()

Returns the driver's major version number.

Specified by:

getMajorVersion in interface java.sql.Driver

See Also:

Driver

getMinorVersion

public int getMinorVersion()

Returns the driver's minor version number.

Specified by:

getMinorVersion in interface java.sql.Driver

See Also:

Driver

jdbcCompliant

public boolean jdbcCompliant()

Report whether the Driver is a genuine JDBC COMPLIANT (tm) driver.

Specified by:

jdbcCompliant in interface java.sql.Driver

See Also:

Driver