Mysql datasource and WebDynpro

Question

Hello all!
I'm new at WD and NW features and I'm trying to figure out the best way to access an external Mysql database with webdynpro.
I already configured an external mysql datasource at NW CE and it's working fine.
My doubt is about how I'm going to access this datasource in NWDS? Do I need to create a new Dictionary? How does it work? How do I link this datasource with my WebDynpro project?
And about the persistence? Must I use JPA, EJB? How do I do it?
Is there any article about this?

Answer 1

Hi,
there are already a lot of examples in the forum of how to connect MySql db with the portal.
Here is a simple solution:
If you have already created a datasource:
try {
               InitialContext initialContext = new InitialContext();
               DataSource dataSource = (DataSource)initialContext.lookup("jdbc/YOUR_DB_ALIAS");
               connection= dataSource.getConnection();
          } catch (SQLException e) {
               // TODO Auto-generated catch block
               e.printStackTrace();
          } catch (NamingException e) {
               // TODO Auto-generated catch block
               e.printStackTrace();
And you must change YOUR_DB_ALIAS with the real alias name. That is all if you have already created a datasource.
About what to use: you can use whatever you want. This is just a simple example of how to get your db connection. After that you can do whatever you want with it.
You can write your one db engine if you want:
                        PreparedStatement stmt = connection.prepareStatement("insert into simple_table simple_values(?)");
               stmt.setString(1, "Hello world");
               stmt.execute();
Or you can use JPA, JDO, EJB, etc... It depends only on your decision. All of them will work.