How the db connection is used in the piece of code of jsp

Question

dear sir,
i have to important question.
i am pasting the code of a jsp file below.... please look in to this...
in this page.. how is he making a database connection... and in this page
where are the select statements and queries.... i have tried many times reading
this ..but i could not find the queries ..not even any one.
if anyone sees this jsp file also ... he will not be able to see the queries.
can u please help me .. how to do this type of connection and also how to use queries
like select insert and delete and update .
an example will help me out...please help me...
Ramesh
the file is below....
<%@ include file="jtfincl.jsp" %>
<%@ page language="java" %>
<%@ page import="oracle.apps.ibu.common.IBUContext" %>
<%@ page import="oracle.apps.ibu.common.IbuException" %>
<%@ page import="oracle.apps.ibu.common.Employee" %>
<%@ page import="oracle.apps.ibu.common.EmployeeInfo" %>
<%@ page import="oracle.jdbc.driver.*" %>
<%@ page import="oracle.apps.jtf.aom.transaction.*" %>
<%@ page import="oracle.apps.jtf.base.resources.*" %>
<%@ page import="oracle.apps.jtf.base.interfaces.MessageManagerInter"%>
<%@ page import="oracle.apps.ibu.registration.IbuRegistration" %>
<%@ page import="oracle.apps.ibu.registration.CustomerVO" %>
<%@ page import="oracle.apps.ibu.common.IDNamePair" %>
<%@ page import="oracle.apps.ibu.common.*" %>
<%@ page import="oracle.apps.ibu.registration.*" %>
<%@ page import="java.math.BigDecimal" %>
<jsp:useBean id = "_displayManager"
class = "oracle.apps.ibu.common.DisplayManager"
scope = "application" />
<jsp:useBean id = "ibuPromptManager"
class = "oracle.apps.ibu.common.PromptManager"
scope = "application" />
<%
String appName= "IBU";
boolean stateless=true;      // used for jtfsrfp.jsp
SiteProperty.load();
String username = SiteProperty.getGuestUsername();
String password = SiteProperty.getGuestPassword();
%>
<%@ include file="jtfsrfp.jsp" %>
<%
     String forwardURL = null;
     String backURL = null;
String emailAddress = null;     
     long employeeID = -1;
     String submitType = (String) request.getParameter("submitType");
     IBUContext context = new IBUContext(fwSession);
     String errorKey = "";
     String errorMessage = "";
     String errorStack = "";
     boolean currentStatus = true;
Object lockx = new Object ();
     OracleConnection conn = null;
try
     TransactionScope.begin(lockx);
try
conn = (OracleConnection)
TransactionScope.getConnection();
     catch ( Exception e )
throw new FrameworkException("Error getting connection..");
if ( conn == null )
throw new FrameworkException("Error getting connection..");
     String[] textMsgs = new String[3];
     MessageManagerInter msgMgr = Architecture.getMessageManagerInstance();
     textMsgs[0] = msgMgr.getMessage("IBU_RG_CONTRACT24");
     //textMsgs[0] = " is not a valid employee email address.";
     textMsgs[1] = msgMgr.getMessage("IBU_RG_CONTRACT25");
     //textMsgs[1] = " Cannot get the employee id.";
     textMsgs[2] = msgMgr.getMessage("IBU_RG_CONTRACT13");
     //textMsgs[2] = "submitType is null, please check program.";
     if ( (submitType != null) && "LOGIN".equals( submitType ) )
     forwardURL="jtflogin.jsp";
     backURL="jtflogin.jsp";
     else if ( (submitType != null) && "EMPLOYEE_CHECK".equals( submitType ) )
     forwardURL="ibuemplcheck.jsp";
     backURL="ibuemplcheck.jsp";
     else if ( (submitType != null) && "EMPLOYEE_NUMBER_SUBMIT".equals( submitType ) )
     backURL="ibuemplcheck.jsp";
emailAddress = (String) request.getParameter("emailAddress");     
     pageContext.setAttribute("emailAddress", emailAddress , PageContext.REQUEST_SCOPE);
     employeeID = IbuRegistration.getEmployeeID(conn,emailAddress);
     if (employeeID == -1)
          throw new IbuRegException(emailAddress + "  "+textMsgs[0] + "  " +textMsgs[1]);
     //validate employee
currentStatus = Employee.isValidate(conn,emailAddress);
//currentStatus = IbuRegistration.isEmployeeValid(conn,emailAddress);
     if (!currentStatus)
          throw new IbuRegException(emailAddress + "  " + textMsgs[0]);
     EmployeeInfo employee = Employee.findEmployee(conn,employeeID);
     pageContext.setAttribute("employee", employee , PageContext.REQUEST_SCOPE);
     pageContext.setAttribute("employeeIDStr", Long.toString(employeeID) , PageContext.REQUEST_SCOPE);
     forwardURL="ibuemplinput.jsp";
     else
     { // Cancel button was pressed
     throw new IbuRegException(textMsgs[2]);
     /* "ibuccsii.jsp"; */
     catch ( IbuException e )
TransactionScope.setRollbackOnly();
     errorMessage = e.getMessage();      
     errorStack = IbuRegException.getStack(e);
     pageContext.setAttribute("errorMessage", errorMessage , PageContext.REQUEST_SCOPE);
     pageContext.setAttribute("errorStack", errorStack , PageContext.REQUEST_SCOPE);
     forwardURL = backURL;
     catch (IbuRegException e)
TransactionScope.setRollbackOnly();
     errorMessage = e.getMessage();      
     errorStack = e.getStack();
     pageContext.setAttribute("errorMessage", errorMessage , PageContext.REQUEST_SCOPE);
     pageContext.setAttribute("errorStack", errorStack , PageContext.REQUEST_SCOPE);
     forwardURL = backURL;
     catch ( Exception e )
TransactionScope.setRollbackOnly();
     errorMessage = e.getMessage();      
     errorStack = IbuRegException.getStack(e);
     pageContext.setAttribute("errorMessage", errorMessage , PageContext.REQUEST_SCOPE);
     pageContext.setAttribute("errorStack", errorStack , PageContext.REQUEST_SCOPE);
     forwardURL = backURL;
//throw new FrameworkException( e , "IBU_UNEXPECTED_EXCEPTION");
     finally
TransactionScope.releaseConnection( conn );
TransactionScope.end ( lockx );
     if (forwardURL == null)
     forwardURL="jtflogin.jsp";
%>
     <jsp:forward page= "<%= forwardURL %>" />
<%@ include file="jtferlp.jsp" %>

Answer 1

Well, if I got you right, you can use RETURNING clause of INSERT statement:
SQL> create table test(x int primary key, y varchar2(10));
Table created.
SQL> create sequence test_seq start with 1 cache 100;
Sequence created.
SQL> create trigger test_insert_br before insert on test for each row
  2  declare
  3    l_x int;
  4  begin
  5    select test_seq.nextval into l_x from dual;
  6    :new.x := l_x;
  7  end;
  8  /
Trigger created.
SQL> set serveroutput on
SQL>
SQL> declare
  2    l_new_x int;
  3  begin
  4    insert into test(y) values('One')
  5    returning x into l_new_x;
  6    dbms_output.put_line(l_new_x);
  7    insert into test(y) values('Two')
  8    returning x into l_new_x;
  9    dbms_output.put_line(l_new_x);
10  end;
11  /
1
2
PL/SQL procedure successfully completed.