java.sql.SQLException: No suitable driver found for JDBC,指定的实例名称
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import java.sql.*;
import net.sourceforge.jtds.jdbc.Driver.*;

public class test {
public static void main(String[] args) {
// TODO Auto-generated method stub
String url= "JDBC:jtds:sqlserver://localhost:1433;DatabaseName=northwind ";
String driver= "net.sourceforge.jtds.jdbc.Driver ";
try {
DriverManager.registerDriver(new net.sourceforge.jtds.jdbc.Driver() );
} catch (SQLException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
}
try {
Object o=Class.forName(driver).newInstance();
Connection conn;
if (o!=null){
conn=DriverManager.getConnection(
"JDBC:jtds:sqlserver://localhost:1433;DatabaseName= 'Northwind ' ", "sa ", " ");
if (conn.isClosed()== true)
System.out.println( "SomeThing goes wrong ");
}

} catch (InstantiationException e) {
System.out.println(e);
e.getStackTrace();
} catch (IllegalAccessException e) {
System.out.println(e);
e.getStackTrace();
} catch (ClassNotFoundException e) {
System.out.println(e);
e.getStackTrace();
} catch (SQLException e) {
System.out.println(e);
e.getStackTrace();
}
}

}

编译通过 但执行出错：
java.sql.SQLException: No suitable driver found for JDBC:jtds:sqlserver://localhost:1433;DatabaseName=northwind

出错语句是
conn=DriverManager.getConnection( "JDBC:jtds:sqlserver://localhost:1433;DatabaseName=northwind ", "sa ", " ");

本地机器是 win2000 +sql server 2000
直接安装sql server 2000 sp3a MDSE时 出现错误，始终未能解决，印象中从未装过MDSE，但安装补丁是提示： "指定的实例名称无效 "

我想知道 conn=DriverManager.getConnection( "JDBC:jtds:sqlserver://localhost:1433;DatabaseName=northwind ", "sa ", " ");
这个出错和MDSE是否有关系 ？如何解决？


------解决方法--------------------
你那JDBC:jtds:sqlserver:@//localhost:1433;DatabaseName=northwind 是不是要这样写你试试

------解决方法--------------------
No suitable driver found for JDBC:jtds:sqlserver://localhost:1433;DatabaseName=northwind
==============================================================
驱动不合适,这不都说得很明白了,检查一下你的驱动跟你的url是否匹配吧
------解决方法--------------------
错了,原来你是用的jTDS.这个我就不清楚了,不行就重装一下Db吧,然后打上补丁,现在好像sp4了