####a question about jdbc driver

Question

A question about jdbc driver: for Oracle JDBC drivers which will not allow O/R
tools to access columns over 4 kb. This affects some of the functionality of my
application.A workaround is to use the my JDBC driver that acts as a wrapper to
ensure that columns over 4 kb read and persist properly. my JDBC driver determines
which actual driver to load based on the connection URL. If you pass in a URL
that contains the string jdbc:oracle:thin, it will know to load oracle.jdbc.driver.OracleDriver.
If the URL contains the string jdbc:db2, it will know to load COM.ibm.db2.jdbc.net.DB2Driver,
and so on.
now i have set CLASSPATH for my jdbc wapper,when I Creating and Configuring a
JDBC Connection Pool,i have to input my driver name such com.lawrence.driver.....then
i did,all
is well,then i restart my WLS,when load config.xml,some errors such as "No registered
driver accept URL:jdbc:oracle:thin:@localhost:1521:lawrence",if i set driver name
is oracle.jdbc.driver.OracleDriver,all is good,no any errors.
I find some questions like:
1.for WLS8.1 ,it is only find some registed driver?
2.why it cannot load my driver wapper when it is loading jdbc Connection Pool,but
when the WLS start is finished, i Creating and Configuring a JDBC Connection Pool
then it is right?

Answer 1

my JDBC driver like this:
public class myDriver implements Driver {
     public static String DB2_DRIVER = "COM.ibm.db2.jdbc.net.DB2Driver";
     public static String DB2_URL = "jdbc:db2:";
     public static String HYPERSONIC_DRIVER = "org.hsqldb.jdbcDriver";
     public static String HYPERSONIC_URL = "jdbc:hsqldb:";
     public static String MYSQL_DRIVER = "com.mysql.jdbc.Driver";
     public static String MYSQL_URL = "jdbc:mysql:";
     public static String ORACLE_DRIVER = "oracle.jdbc.driver.OracleDriver";
     public static String ORACLE_URL = "jdbc:oracle:";
     public static String POSTGRESQL_DRIVER = "org.postgresql.Driver";
     public static String POSTGRESQL_URL = "jdbc:postgresql:";
     public static String SQLSERVER_DRIVER =
          "com.microsoft.jdbc.sqlserver.SQLServerDriver";
     public static String SQLSERVER_URL = "jdbc:microsoft:";
     public boolean acceptsURL(String url) throws SQLException {
          return true;
     public synchronized Connection connect(String url, Properties props)
          throws SQLException {
          if (_driver == null) {
               Class driverClass = null;
               try {
                    if (url.startsWith(DB2_URL)) {
                         driverClass = Class.forName(DB2_DRIVER);
                    else if (url.startsWith(HYPERSONIC_URL)) {
                         driverClass = Class.forName(HYPERSONIC_DRIVER);
                    else if (url.startsWith(MYSQL_URL)) {
                         driverClass = Class.forName(MYSQL_DRIVER);
                    else if (url.startsWith(ORACLE_URL)) {
                         driverClass = Class.forName(ORACLE_DRIVER);
                    else if (url.startsWith(POSTGRESQL_URL)) {
                         driverClass = Class.forName(POSTGRESQL_DRIVER);
                    else if (url.startsWith(SQLSERVER_URL)) {
                         driverClass = Class.forName(SQLSERVER_DRIVER);
                    _driver = (Driver)driverClass.newInstance();
               catch (Exception e) {
                    throw new SQLException(e.getMessage());
          Connection con = _driver.connect(url, props);
          return new myConnection(con);
     public int getMajorVersion() {
          return _driver.getMajorVersion();
     public int getMinorVersion() {
          return _driver.getMinorVersion();
     public DriverPropertyInfo[] getPropertyInfo(String url, Properties props)
          throws SQLException {
          return _driver.getPropertyInfo(url, props);
     public boolean jdbcCompliant() {
          return _driver.jdbcCompliant();
     private Driver _driver;