那位兄弟给段代码：连接Oracle数据库的。

============ORACLE 8i============================
Class.forName ("oracle.jdbc.driver.OracleDriver"); 
Connection conn = 
  DriverManager.getConnection ("jdbc:oracle:thin:@myhost:1521:orcl",
      "scott", "tiger");=============MySQL=================================
Class.forName("org.gjt.mm.mysql.Driver").newInstance();
conn = DriverManager.getConnection("jdbc:mysql://myhost:3306/dbname","user","passwd");============InfoMax================================
Class.forName("com.informix.jdbc.IfxDriver");
conn = DriverManager.getConnection("jdbc:informix-sqli://myhost:1533:informixserver=myserver;user=rdtest;password=test"); 
============InforMix================================
Class.forName("com.informix.jdbc.IfxDriver");
conn = DriverManager.getConnection("jdbc:informix-sqli://myhost:1533:informixserver=myserver;user=rdtest;password=test"); 
=============SQLServer2000=========================
Class.forName("com.microsoft.jdbc.sqlserver.SQLServerDriver");
Connection conn = DriverManager.getConnection
("jdbc:microsoft:sqlserver://server1:1433","username","password"); 
///////////////////////////////////
jdbc driver download:SQLServer:http://www.microsoft.com/sql/downloads/default.asp
MySQL:http://www.mysql.com/downloads/api-jdbc.html
Oracle:http://otn.oracle.com/software/content.html ---------------------DB2--------------------
---------------------  --------------------
Class.forName("COM.ibm.db2.jdbc.app.DB2Driver").newInstance();//For Application
      String url = "jdbc:db2:sample";
      con = DriverManager.getConnection(url, userid, passwd);
Class.forName("COM.ibm.db2.jdbc.net.DB2Driver").newInstance();//For Applet
        String url = "jdbc:db2:// "+server+":"+port+"/sample"; 
        con = DriverManager.getConnection(url, userid, password );