What is the Relation between SAP EP, SAP R/3 and any database

Hi ALL,
I am learning SAP EP,Webdynpro
Previously I have worked on IBM WebSphere Portal for installation and configuration test purpose on different operating systems.
In case of IBM webSphere Portal
1. There is a default database named as Cloudspace
2. I had configured WebSphere Portal with different databases(Oracle,sql,DB2) just by modifing some portal installation files.
Similarly in case of SAP Enterprise Portal
1. Is there any default database.
2. How can we configure the portal with different databases(Oracle,sql,DB2)
3. Why the SAP R/3 comes into the picture in case of SAP EP
4. can we communicate to any database(Oracle,sql,DB2) through NetWeaver Developer Studio by writing any code or by setting any fields.
Please help out me
Regards
Seshu

Hi! Sesshanna,
   Welcome to SAP Enterprise Portal.
1.Like IBM webSphere Portal,SAP EP is also have a default DataBase Named MaxDB, this database comes with portal installer and you need to install this DataBase as well.
2.you will get a lots of document on SDN to configure the databases like(Oracle,sql,DB2), you need to make an entry in Visual Administrator(go.bat).But if you want to use DataBase in standalone application then you can use the same code which generally we use in any Java Code(Code written in point 4).
3.You can use SAP R/3 as BackEnd to access R/3 RFC in WebDynpro application, which is used to develop any customized application.
4.you can write the following code in any view or controller of the NWDS:--
MessageManager msgMgr = (MessageManager)wdThis.wdGetAPI().
getComponent().getMessageManager();
                String  serverName = "172.21.1.62";
     String portNumber = "1526";
     String sid = "vision";
  String url = "jdbc:oracle:thin:@" + serverName + ":" + portNumber + ":" + sid;
     String userName = "scott";
     String password = "tiger";
     Connection connection = null;
     try {
      // Load the JDBC driver
     String driverName = "oracle.jdbc.driver.OracleDriver";
     Class.forName(driverName);
     connection = DriverManager.getConnection(url, userName, password);
     Statement stmt =connection.createStatement();
ResultSet resultSet = stmt.executeQuery("select * from patni_employee");
        if(resultSet.next()) {
          msgMgr.reportWarning(resultSet.getString(1));
          msgMgr.reportWarning(resultSet.getString(2));
     } catch(Exception exc) {
      exc.printStackTrace();
regards,
Mithileshwar

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