Laura, I need some code samples you mentioned...

Question

Laura,
I posted a message a few days ago regarding calling Stored Procedures in my JDev 3.1 (JDK 1.2.2) BC4J application. I need to be able to call them two different ways. The first involves passing some parameters to the SP and recieving back the ResultSet. In the other instance I simply need to make a call to them to perform some tasks on the DB side. Nothing will be returned from these SP's. You discussed implementing the SQL as a VO and gave me some code showing me how I might do this. You also mentioned that it is possible to create a method on the AppMod and call this from the JSP client. I need to know which method should work best for me and to get the code samples for the second option.
Thanks.
Rob

Answer 1

Hi,
Here is the code I used for the custom method on my VO (same could be used from the app module rather than a specific VO). The stored procedure I am calling here performs some calculations and returns an integer value:
public int getTotalHits(String mon, String year) {
CallableStatement stmt = null;
int total;
String totalhits = "{? = call walkthru.total_hits(?,?)}";
stmt = getDBTransaction().createCallableStatement(totalhits, 1);
try
// Bind the Statement Parameters and Execute this Statement
stmt.registerOutParameter(1,Types.INTEGER);
stmt.setString(2,mon);
stmt.setString(3,year);
stmt.execute();
total = stmt.getInt(1);
catch (Exception ex)
throw new oracle.jbo.JboException(ex);
finally
try
stmt.close();
catch (Exception nex)
return total;
After adding the custom method to your appmoduleImpl.java file and rebuilt your BC4J project, do the following:
1. Select the Application Module object and choose Edit from the context menu.
2. Click on the Client Methods page. You should see the method you added in the Available list.
3. Select the method and shuttle it to the Selected list.
4. Click Finish. You should see a new file generated under the application module object node in the Navigator named appmodule.java that contains the client stubs for your method.
5. Save and rebuild your BC4J project.
I wrote a custom web bean to use from my JSP page to call the method on my VO:
public class GetTotals extends oracle.jdeveloper.html.DataWebBeanImpl {
public void render() {
int totalhits;
try
Row[] rows;
// Retrieve all records by default, the qView variable is defined in the base class
qView.setRangeSize(-1);
qView.first();
rows = qView.getAllRowsInRange();
// instantiate a view object for our exported method
// and call the stored procedure to get the total
ViewObject vo = qView.getViewObject();
wtQueryView theView = (wtQueryView) vo;
totalhits = theView.getTotalHits(session.getValue("m").toString(),session.getValue("y").toString());
out.println(totalhits);
} catch(Exception ex)
throw new RuntimeException(ex.getMessage());
I just call the render method on this custom web bean from the JSP. I am not passing parameters to the render method of the bean, but instead access the parameters I need from the session:
session.getValue("m").toString()
I set these session parameters from the JSP that is called when the user submits their query criteria form. For example:
// get the view parameter from the form String month = request.getParameter("month");
String year = request.getParameter("year");
// store the information for reference later session.putValue("m", month); session.putValue("y", year);
Hope this helps.