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type CategoryInfo = { CategoryID: int; Name: string; } type ProductInfo = { ProductName: string; Price: System.Decimal; } module DataSource = let db = new Northwind(WebConfigurationManager.ConnectionStrings. Item("NorthwindData").ConnectionString) let GetCategories () = SQL <@ seq { for c in db.Categories -> { CategoryID = c.CategoryID Name = c.CategoryName } } @> let GetProducts (categoryId) = SQL <@ seq { for p in db.Products when p.CategoryID = categoryId -> { ProductName = p.ProductName Price = p.UnitPrice.Value } } @> The code in Listing 14-7 first declares two simple record types that are used in the database queries for returning results. You could use tuples for these results, but record types are easier to work with when accessing the information stored using ASP.NET markup. The code in the DataSource module first creates a value of the Northwind type, which is a class representing the Northwind database and was generated by the LINQ tool SqlMetal, described in 15. The constructor of the generated type takes the connection string as an argument, so we use WebConfigurationManager provided by ASP.NET to read it from the web.config file, which we will look at shortly. Finally, the module contains two functions, both implemented using F# Linq. As you can see, the database query is written as a sequence expression and is wrapped in F# quotations that were discussed in 9. The query is executed using the SQL function,

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In any case, the flexibility developers have at their disposal has increased dramatically Most events in the pipeline now have a sister event that occurs before any processing has been done for this step in the pipeline (the Pre event), and another that occurs after all processing is complete (the Post event) The built-in Role Manager, a feature new to ASP NET 20, uses the PreAuthorizeRequest event as its entry point for processing This is where the Role Manager checks to see if role management is on If it is, the manager checks to see if a user object exists; and if it s not, the manager creates a generic user This is also where the roles cookie is managed (We ll examine the Role Manager specifically in 5) Next up after the security events is ResolveRequestCache.

finally { JDBCUtil.close( rset ); JDBCUtil.close( pstmt ); } } Inserting Objects Using the setORAData() Method of OraclePreparedStatement There are two methods to insert objects. The first uses the setORAData() method of the Oracle extension interface OraclePreparedStatement (or OracleCallableStatement). The method signature is as follows. The method takes as input the column index of the data and an ORAData instance. public void setORAData (int colIndex, ORAData oradata) The method _demoInsertUsingSetORAData() defined as follows uses the setORAData() method as part of the process of inserting an object into address_table. The code is fairly self-explanatory. private static void _demoInsertUsingSetORAData( Connection connection) throws SQLException { OraclePreparedStatement opstmt = null; try { MyAddressORAData myAddress = new MyAddressORAData(); myAddress.setLine1("133 Ferry Rd"); myAddress.setLine2( "Apt # 24"); myAddress.setStreet( "Crypton St." ); myAddress.setCity( "Dallas"); myAddress.setState( "TX" ); myAddress.setZip( "75201" ); String insertStmt = "insert into address_table values( )"; opstmt = (OraclePreparedStatement) connection.prepareStatement ( insertStmt ); opstmt.setORAData (1, myAddress ); int rows = opstmt.executeUpdate(); System.out.println ( "Inserted " + rows + " row(s) " ); connection.commit(); } finally { JDBCUtil.close( opstmt ); } }