初学白小黑寻“高手”！（JDBC问题）java 连接数据库出错！（全代码）

public class Access_CreateStudent{
public static void main(String args[]){
String url = "jdbc:odbc:mydata";
String sql = "create table studentnum"+
"(name VARCHAR(20)," +
"sex CHAR(2),"+
"birthday Date,"+
"leave BIT,"+
"stnumber INTEGER)";
try{
Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
}catch(java.lang.ClassNotFoundException e){
System.out.println("出现数据库连接错误! classNotFoundException ！");
e.printStackTrace();
}
try{
Connection con = DriverManager.getConnection(url,null,null); 
Statement stmt = con.createStatement();
stmt.executeUpdate(sql);
System.out.println("student table created");
stmt.close();
con.close();
}catch(SQLException sqle){
System.out.println("出现数据库连接错误！");
sqle.printStackTrace();
}  
}
}


编译可以，但是运行就出错了，还请高手们赐教！白小黑拜谢！

------解决方案--------------------
Access_CreateStudent.main(Access_CreateStudent.java:19)
19行是哪行，自己看看
------解决方案--------------------
Connection con = DriverManager.getConnection(url,null,null);

你三个参数一个都不传? 这个conn 也能new 出来 ？
------解决方案--------------------
"jdbc:odbc:mydata";
应该是这里错了，是不是mydata，确认一下
------解决方案--------------------
好吧,我是给你粘贴的实在不先打字了~~好好看看,我刚开始学习的时候也是这样的,慢慢的多写几遍就好了~

一、JDBC连接DB2
Class.forName("Com.ibm.db2.jdbc.net.DB2Driver"); 
String url="jdbc:db2://dburl:port/DBname" 
cn = DriverManager.getConnection( url, sUsr, sPwd );

二、JDBC连接Microsoft SQLServer(microsoft)
Class.forName( "com.microsoft.jdbc.sqlserver.SQLServerDriver" ); 
cn = DriverManager.getConnection( "jdbc:microsoft:sqlserver://DBServerIP:1433;databaseName=master", sUsr, sPwd ); 

三、JDBC连接Sybase(jconn2.jar)
Class.forName( "com.sybase.jdbc2.jdbc.SybDriver" ); 
cn = DriverManager.getConnection( "jdbc:sybase:Tds:DBServerIP:2638", sUsr, sPwd ); 

四、JDBC连接MySQL(mm.mysql-3.0.2-bin.jar)
Class.forName( "org.gjt.mm.mysql.Driver" ); 
cn = DriverManager.getConnection( "jdbc:mysql://DBServerIP:3306/myDatabaseName", sUsr, sPwd ); 

五、JDBC连接PostgreSQL(pgjdbc2.jar)
Class.forName( "org.postgresql.Driver" ); 
cn = DriverManager.getConnection( "jdbc:postgresql://DBServerIP/myDatabaseName", sUsr, sPwd ); 

六、JDBC连接Oracle(classes12.jar)
Class.forName( "oracle.jdbc.driver.OracleDriver" ); 
cn = DriverManager.getConnection( "jdbc:oracle:thin:@MyDbComputerNameOrIP:1521:ORCL", sUsr, sPwd ); 

七、JDBC连接ODBC 
Class.forName( "sun.jdbc.odbc.JdbcOdbcDriver" ); 
Connection cn = DriverManager.getConnection( "jdbc:odbc:" + sDsn, sUsr, sPwd );