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In this section, we will use the JPublisher utility to generate the reference classes for the object type emp_ref_type. We will use the following properties file (called prop.txt) for this purpose: jpub.user=benchmark/benchmark jpub.methods=all jpub.builtintypes=jdbc jpub.numbertypes=objectjdbc jpub.usertypes=oracle jpub.package=book.ch08.ref.jpub jpub.input=input.txt Note that you may need to modify the jpub.package property to give a package name according to your directory structure; this is the package to which the generated classes belong. The file input.txt referred to in the property jpub.input contains the following line: SQLEMP_TYPE AS Employee As you can see, we plan to generate a class Employee for our object type emp_ref_type. JPublisher will also generate the employee reference class (called EmployeeRef) automatically. We finally generate the custom reference classes by running the following command: Jpub props=prop.txt

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comm.Parameters.AddWithValue("@Name", name) |> ignore use adapter = new SqlDataAdapter(comm) let table = new DataTable() adapter.Fill(table) |> ignore table We can execute the stored procedure as follows to find the employees with the last name Smith: > for row in (GetEmployeesByLastName "Smith").Rows do printfn "row = %O, %O" (row.Item("FirstName")) (row.Item("LastName"));; row = Joe, Smith row = Eve, Smith val it : unit = ()

Each step of the way, we examine the options and services available to meet different nonfunctional requirements at each tier and between adjoining tiers This is not to say it s a blueprint for a specific application architecture You have many choices, and many more possibilities when you consider the number of ways you can combine those choices The architecture you design depends on the requirements of your application And believe it or not, all applications are unique The answer to any question when it comes to the architecture is, It depends This is why you make the big bucks This is why your job seems so hard And it is In this book, we give you the background to make it easier when the NET Framework is your primary toolset.

The following listing shows the generated code (edited for clarity) for the EmployeeRef class: package book.ch11.ref.jpub; /* imports deleted for clarity and conciseness */ public class EmployeeRef implements ORAData, ORADataFactory { public static final String _SQL_BASETYPE = "BENCHMARK.EMP_REF_TYPE"; public static final int _SQL_TYPECODE = OracleTypes.REF; REF _ref; private static final EmployeeRef _EmployeeRefFactory = new EmployeeRef(); public static ORADataFactory getORADataFactory() { return _EmployeeRefFactory; } /* constructor */ public EmployeeRef() { } /* ORAData interface */ public Datum toDatum(Connection c) throws SQLException { return _ref; } /* ORADataFactory interface */ public ORAData create(Datum d, int sqlType) throws SQLException { if (d == null) return null; EmployeeRef r = new EmployeeRef(); r._ref = (REF) d; return r; } public static EmployeeRef cast(ORAData o) throws SQLException { if (o == null) return null; try { return (EmployeeRef) getORADataFactory().create( o.toDatum(null), OracleTypes.REF); } catch (Exception exn) { throw new SQLException("Unable to convert "+ o.getClass().getName()+" to EmployeeRef: "+exn.toString()); } }

You saw in 14 how data tables can be visualized in web applications. The return value of GetEmployeesByLastName from the previous section is a DataTable. These objects can also be directly bound to a Windows Forms data grid, a visual data control that supports the DataSource property and that can display data in a tabular format. Windows Forms controls were discussed in 11. open System.Windows.Forms let emps = GetEmployeesByLastName "Smith" let grid = new DataGrid(Width=300, Height=200, DataSource=emps) let form = new Form(Visible=true, TopMost=true) form.Controls.Add(grid) Figure 15-1 shows what you will see when you run this code.

public Employee getValue() throws SQLException { return (Employee) Employee.getORADataFactory().create( _ref.getSTRUCT(), OracleTypes.REF); } public void setValue(Employee c) throws SQLException { _ref.setValue((STRUCT) c.toDatum(_ref.getJavaSqlConnection())); } } The following listing shows the generated Employee class (edited for clarity): package book.ch11.ref.jpub; /* imports deleted for clarity and conciseness */ public class Employee implements ORAData, ORADataFactory { public static final String _SQL_NAME = "BENCHMARK.EMP_REF_TYPE"; public static final int _SQL_TYPECODE = OracleTypes.STRUCT; protected MutableStruct _struct; private static int[] _sqlType = { 2,12,2006 }; private static ORADataFactory[] _factory = new ORADataFactory[3]; static { _factory[2] = EmployeeRef.getORADataFactory(); } protected static final Employee _EmployeeFactory = new Employee(); public static ORADataFactory getORADataFactory() { return _EmployeeFactory; } /* constructors */ protected void _init_struct(boolean init) { if (init) _struct = new MutableStruct(new Object[3], _sqlType, _factory); } public Employee() { _init_struct(true); } public Employee(java.math.BigDecimal empNo, String name, EmployeeRef manager) throws SQLException { _init_struct(true); setEmpNo(empNo); setName(name); setManager(manager); }