Bug 191404 Connection is still successful after delete drivers[0703]
Description: Create a Sqlserver datasource and dataset, then delete the jtds driver. Click "Test Connection" is still successful, and the dataset still works. Build Version:2.2.0.v20070607-0630 Steps to reproduce: 1. Add a jtds driver, and create a Sqlserver connection and dataset. 2. Go to "Manage JDBC Drivers" dialog, and delete the driver. 3. Click "Test Connection", the connection is successful. 4. Click "Preview Results" in "Edit Data Set" dialog, it works. Expected Result: Delete driver will lose the connection.
data/org.eclipse.birt.report.data.oda.jdbc/src/org/eclipse/birt/report/data/oda/jdbc/JDBCDriverManager.java
* @param userId
	 *            the user id
	 * @param password
	 *            the pass word
	 * @return boolean whether could the connection being created
	 * @throws OdaException
	 */
	public boolean testConnection( String driverClassName,
			String connectionString, String userId, String password )
			throws OdaException
	{
        return testConnection( driverClassName, connectionString, null,
                                userId, password );
    }
    
    /**
     * Tests whether the given connection properties can be used to obtain a connection.
     * @param driverClassName the name of driver class
     * @param connectionString the JDBC driver connection URL
     * @param jndiNameUrl   the JNDI name to look up a Data Source name service; 
	 *						may be null or empty
     * @param userId        the login user id
     * @param password      the login password
     * @return  true if the the specified properties are valid to obtain a connection;
     *          false otherwise
     * @throws OdaException 
     */
    public boolean testConnection( String driverClassName,
            String connectionString, String jndiNameUrl,
            String userId, String password )