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pstmt = conn.prepareStatement( stmtString ); rset = pstmt.executeQuery(); System.out.println("executed query"); while(rset.next()) { We retrieve and print out the values in the columns emp_no and name first: int empNo = rset.getInt( 1 ); String name = rset.getString( 2 ); System.out.println("emp no : " + empNo ); System.out.println("emp name : " + name ); We then use the method getRef() in the ResultSet interface to retrieve the reference object: Ref managerRef = rset.getRef( 3 ); Next, we retrieve the object pointed to by the reference object. Since there is no type map specified, we will get the value as a STRUCT object. Note that the record corresponding to the top-level employee (Larry) has a null reference, so we need to check for that condition. if( managerRef != null ) { We print out the SQL object base type of this reference object: System.out.println( "Reference SQL Type: " + managerRef.getBaseTypeName() ); As mentioned earlier, the getObject() method of java.sql.Ref interface gives an unsupported feature exception when working with either 9i Release 2 or 10g Release 1 databases. Hence, we have to use the getValue() method of the REF class: // The following gives an Unsupported feature in 9i and 10g //STRUCT manager = (STRUCT) ((oracle.sql.REF)managerRef).getObject(); STRUCT manager = (STRUCT) ((oracle.sql.REF)managerRef).getValue(); In the remainder of the method, we simply use the getAttributes() method of the Struct interface to print out the attribute values of the object to which the reference points: Object attributes[] = manager.getAttributes(); System.out.println("no of manager attributes : " + attributes.length ); for(int i=0; i < attributes.length; i++ ) { if( attributes[i] != null ) { System.out.println("\tattribute # " + i + " class name " + attributes[i].getClass().getName() + " value " + attributes[i]); }

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C:\fsharp> xsd.exe employees.xsd /d /l:CS /n:Employees.Data Writing file 'C:\fsharp\Employees.cs'. C:\fsharp> csc /target:library Employees.cs This generates a C# file Employees.cs in the Employees.Data namespace containing a typed dataset for the Employees table, which we then compile to Employees.dll. We can now reference this DLL and create an instance of a typed dataset: > #r @"employees.dll";; Binding session to 'C:\fsharp\Employees.dll'... > let employeesTable = new Employees.Data.NewDataSet();; val employeesTable : Employees.Data.NewDataSet > dataAdapter.Fill(employeesTable) |> ignore;; val it : unit = () // ignore the number of records

} } } } finally { JDBCUtil.close( rset); JDBCUtil.close( pstmt); } } Updating a Ref Object Updating a Ref object simply means making it point to a different row in the table. The following _doUpdateRef() method does that by first invoking the method _getRefForUpdate() to retrieve the Ref object and then invoking the method _updateEmployeeRef() to update the reference object in the table: private static void _doUpdateRef( Connection conn ) throws SQLException { Ref newManagerRef = _getRefForUpdate( conn, 1 ); _updateEmployeeRef( conn, 3, newManagerRef ); conn.commit(); } The definition of the method _getRefForUpdate() basically is the same as that of the method _doSelectRef() covered in section Querying a Ref Object earlier. The only difference is that it uses the for update nowait clause to lock the row so that another session does not update the same row before we complete our update. This problem, known as the lost update problem, along with its suggested solutions, is discussed in detail in 16. private static Ref _getRefForUpdate( Connection conn, int empNo ) throws SQLException { String stmtString = "select ref(e) " + " from emp_table_with_ref e " + " where e.emp_no = for update nowait"; PreparedStatement pstmt = null; ResultSet rset = null; try { pstmt = conn.prepareStatement( stmtString ); pstmt.setInt( 1, empNo ); rset = pstmt.executeQuery(); Ref managerRef = null; if(rset.next()) // only one row expected {

> for emp in employeesTable._Table do printfn "%s, %s - %O" emp.LastName emp.FirstName emp.Birthday;; Smith, Joe - 14/02/1965 00:00:00 Jones, Mary - 15/09/1985 00:00:00 Smith, Eve - 27/09/2007 00:00:00 Note that in the iteration emp is known to have a strong type that allows us to access fields LastName, FirstName, and Birthday. Finally, it is very easy to dump out XML for our data: > printf "%s" (employeesTable.GetXml());; <NewDataSet> <Table> <EmpID>1001</EmpID> <FirstName>Joe</FirstName> <LastName>Smith</LastName> <Birthday>1965-02-14T00:00:00+00:00</Birthday> </Table> <Table> <EmpID>1002</EmpID> <FirstName>Mary</FirstName> <LastName>Jones</LastName> <Birthday>1985-09-15T00:00:00+01:00</Birthday> </Table>

As you ll see in the next section, the processors can be used not only across pages in a single application, but also, by implementing HttpModules, they can be reused across applications Avoiding tight couplings between these processors and Page objects will make it easier to reuse them as your project grows to encompass more than one IIS application..