用户登录的验证完整程序

　　public String validateUser(String inputUserid, String inputPwd)
　　throws SQLException{
　　String returnString = null;
　　String dbUserid = "userid"; // Your Database user id
　　String dbPassword = "password" ; // Your Database password
　　Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
　　Connection con = DriverManager.getConnection("jdbc:odbc:myDriver",
　　dbUserid ,dbPassword );
　　Statement stmt = con.createStatement();
　　String sql= "select USERID from USERTABLE where USERID = "" +
　　inputUserid + "" and PASSWORD = "" + inputPwd +"" ;" ;
　　ResultSet rs = stmt.executeQuery(sql);
　　if (rs.next())
　　{
　　returnString = rs.getString("USERID");
　　}
　　stmt.close();
　　con.close();
　　return returnString ;
　　}