Hi Mitesh,
Initially I had tried few ways to connect directly from WD to Oracle, but nothing worked for me. Finally I could achieve it only through ejbs & even today I stick to that. I tried out many things for connecting directly including accessing the JDBC connector service of the server, but don't know why nothing worked for me.
Anyway, I'll send you the step by step process to create the ejb & use it in your WebDynpro application to connect to the database (you might find it a bit long, but I believe I have included every step). If someone knows a better way to connect pls let us know, cos it is tiresome to write ejbs each time we need to connect.
1) Open the J2EE perspective
2) Create an EJB Module project
3) Right click on ejbModule, create a new EJB (select your EJB type)
4) While creating the ejb itself, you can add business methods by clicking ‘Next’ in the UI. Another option is after creating the ejb, write the method in the bean, then select the method from ejb-jar.xml -> <bean name> ->method. Right click and select ‘propogate to local & remote’.
5) Double click on ejb-j2ee-engine.xml. select your bean and specify a Jndi name for eg: “MyJndi”.
6) Right click on the EJB project and add ‘classes12.zip’ file (provided by Oracle) to it’s build path. (under libraries tab). Also check the same file under ‘Order & Export’.
7) Create an Enterprise Application project.
8) Right click on the EJB module project and select add to EAR project, then select the created EAR project.
9) Right click on the EJB project, select ‘Build EJB Archive’
10) Right click on the EAR project, select ‘Build Application Archive’
11) Open the WebDynpro perspective, open a new project, right click on the project ->properties. Do the following configurations :-
• Java Build path - select the EJB project from ‘projects’ , check the selected project under ‘Order & Export’
• Project references – select the EAR project
• WebDynpro references – select ‘sharing references’ tab, click add & make an entry as : <vendor>/<EAR project name without .ear extension>
You can find the vendor name under ‘application-j2ee-engine.xml’ file of the EAR project. By default it is ‘sap.com’. So if my EAR project’s name is ABC, my entry would look like ‘sap.com/ABC’
12) Now the configurations are over and the EJB can be invoked by writing the client code inside the webdynpro component. Like:
InitialContext context = new InitialContext();
Object obj = context.lookup("MyJndi");
MyEJBHome home = MyEJBHome)PortableRemoteObject.narrow(obj,MyEJBHome.class);
MyEJB mybean = home.create();
int a = 0;
a= mybean.add(10,15);
wdContext.currentContextElement().setSum(a);
where ‘MyEJB’ is my EJB name and ‘MyJndi’ is my JNDI name
To connect to Oracle , you can write the usual Java code (given below) as a business methos of the ejb (similar to add() method in the example). And access it like mybean.<businessMethodName>().
DriverManager.registerDriver(new oracle.jdbc.driver.OracleDriver());
Connection conn = DriverManager.getConnection("jdbc:oracle:thin:@Oracle_server_ip:Oracle port:SID of the Database","user_name","password");
Statement stmt = conn.createStatement();
ResultSet rs = stmt.executeQuery("your query");
Hope this helps & pls do let us know if you have any further queries,
Best Regards,
Nibu.
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