مشکل با اتصال به دیتابیس در JSP

فایل زیر باید تمام دیتابیس ها رو نشون بده اما یه ارور میده :

<%@ page contentType="text/html; charset=iso-8859-1" language="java" import="java.sql.* " %>

<%@ page import="java.io.*" %>

<%

try {

String driver = "org.postgresql.Driver";

String url = "jdbc:postgresql://10.10.10.10:4444/admin";

String username = "admin";

String password = "admin";

String myDataField = null;

String myQuery = "select datname from pg_database;";

Connection myConnection = null;

PreparedStatement myPreparedStatement = null;

ResultSet myResultSet = null;

Class.forName(driver).newInstance();

myConnection = DriverManager.getConnection(url,username,password)  ;

myPreparedStatement = myConnection.prepareStatement(myQuery);

myResultSet = myPreparedStatement.executeQuery();

if(myResultSet.next())

myDataField = myResultSet.getString("dispname");

out.print(myDataField);

}

catch(ClassNotFoundException e){e.printStackTrace();}

catch (SQLException ex)

{

out.print("SQLException: "+ex.getMessage());

out.print("SQLState: " + ex.getSQLState());

out.print("VendorError: " + ex.getErrorCode());

}

%>

ارورش اینه :

SQLException: The column name dispname was not found in this ResultSet.SQLState: 42703VendorError: 0

مشکل از کجاست؟