MySQL is not connecting

Question

DB and table names are correct. linked the classpath of MySQL connecter java. but when i run i get Not Found Result. i have tried different queries and different links to sql connector.

final static String jdbc_driver="com.mysql.jdbc.Driver";
    final static String db_url="jdbc:mysql://localhost/oyutan/";
    Connection con=null;
    java.sql.PreparedStatement ps=null;
    ResultSet rs=null;

@Override
    public void actionPerformed(ActionEvent r) {
        if(r.getSource()==ok){
            fr.setVisible(false);
            GUI guu=new GUI();
            String card=cardnum.getText();
            String pinn=pin.getText();

            String sql="SELECT *FROM `card`";
            try{
                Class.forName(jdbc_driver);
                con=DriverManager.getConnection(db_url, "root", "");
                ps=con.prepareStatement(sql);
                rs=ps.executeQuery();
                while(rs.next());{
                    System.out.println(rs.getString("")+"");
                }}

                catch(Exception e){
                    System.out.println("Not Found!");
                }

            }
        }

Answer 1

There is no space between * And FROM , try using this :

 String sql = "SELECT * FROM 'card' "; 

Answer 2

change

String sql="SELECT *FROM `card`";

to

String sql="SELECT * FROM card "; 

and give a try

Answer 3

You made a mistake you must add the portnumber after localhost. in db_url

ex :- final static String db_url="jdbc:mysql://localhost/oyutan/"; modify this as final static String db_url="jdbc:mysql://localhost:<port number>/oyutan/";

without the port number it wont work. the port number is not always the same it could be 3306,3309 etc..

final static String db_url="jdbc:mysql://localhost:3306/oyutan/";

Answer 4

I think your sql was wrong.

  String sql="SELECT * FROM card "; 

you need add a white space after " * "