Java Reference
In-Depth Information
registers the newly created instance with the
DriverManager
.
Listing 19-3
shows how simple the
XMLDriver
is.
Listing 19-3: XMLDriver class
package JavaDatabaseBible.ch19.JDBCforXML;
import java.sql.*;
import java.util.Properties;
import JavaDatabaseBible.ch19.JDBCImpl.JDBCDriverImpl;
public class XMLDriver extends JDBCDriverImpl{
protected XMLConnection con;
static {
try {
java.sql.DriverManager.registerDriver(new XMLDriver());
}catch(SQLException e) {
System.err.println(e);
}
}
public XMLDriver() {
}
public boolean acceptsURL(String url) throws SQLException {
return url.endsWith(".xml");
}
public Connection connect(String url, Properties info)
throws SQLException {
con = new XMLConnection(url);
return con;
}
}
In addition to loading JDBC drivers, the
DriverManager
attempts to locate a suitable driver for the
specified URL and returns a connection to the appropriate driver. It does this by polling the registered
drivers'
acceptsURL(String url)
methods.
The
DriverManager
is also responsible for getting a
java.sql.Connection
to the database. It
does this by calling the driver's
connect()
method, passing the
URL
for the database. The driver then
creates a
Connection
object and returns it to the
DriverManager
.
The XMLConnection class
