Connect To Database From Within Java Applet

That's how you do it with thin JDBC driver:
   

try {


            Class.forName ("oracle.jdbc.driver.OracleDriver");
         conn =
                      DriverManager.getConnection ("jdbc:oracle:thin:@host_name:1521:SID",
             user, password);

        stmt = conn.createStatement();


 addressVector = new Vector();
  ResultSet rs0 = stmt.executeQuery("select email from  table_name");

 while (rs0.next()) {

  addressVector.addElement(new InternetAddress(rs0.getString("email")));

  }

conn.close();
  } catch(Exception ex) {....
}

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Yes you can connect to the databse from Applet if the instance is running on the
same host as web server

 Applet, even unsigned, allows network connections to the server from which it was loaded,
therefore if your database instance is running on the same server as the web server
from which you loaded applet, then you can connect to database - I did this way may times.

Signed applet can connect to other servers, but signing is rather painful operation,
and installing web server is usually rather simple, so you can isntall and setup web server
on the same server where you have database and in this way be able to access it from applet.

Normally the applet can be accessed from client browser so in the client browser there is no Oracle or SQL Server running, is it possiple to run this code inside the applet within client browser not on the server or web server.

Thank you

No, of course you don't have database on the client machine, you can have web server (not to be mixed up with web browser) on the same machine
as Oracle database - your client will only have browser and applet will run in his browser, but it can
communicate wityh your server, where you have databse, and from which it could have been loaded if it also had web server.

Could you please, post any working example to connect to SQL Server, SQL CE (Recommended) or Oralce  from within Applet,

Thank you,

I posted the code above how to connect to Oracle - this code
is indpendent whether you need to connect from Java application or applet - all
connection details will be the same

The only thing that you'll have to have jdbc driver - and these drivers - they are pure java - jar files
will be different for Oracle and for SQL server - you want to decide which one you will be using
and then download them eiither from Oracle or from Microsoft

Thank you for helpful answers, actually what I need to do is connecting my applet to SQL CE database, to read some settings before it launch,That's why I have used the Web service to call from wihin applet, and that web service can connect to this SQL CE,and  return XML data as settings but I have faced a problem when I browse the page from remote pc not in the same local pc.

Can you help me, in this issue please,
I have post this question in another post, can you look at it,please?
https://www.experts-exchange.com/questions/26838137/Applet-And-NET-web-Service-Calling.html

Thank you

Doesnot provide a way to SQL CE in java.