.NET/Java PDF, Tiff, Barcode SDK Library

Table 19-2. Conventions Associated with Public Constructs in .NET Frameworks and Author-Recommended Extensions for F# Constructs

Proxy authentication is a feature available only in the JDBC OCI driver as of Oracle 10g Release 1.

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j++; } i++; Finally, you ll close the script tag and inject the JavaScript into the control tree by adding it as a child of the PlaceHolder in the head. sb.Append("</script>"); plScript.Controls.Add(new LiteralControl(sb.ToString())); The output for both the static example and the dynamically generated version is the same, as shown in Figure 4-11. The page behaves exactly the same way as the static example, except now the lists are data driven (the complete code for this demo is in Scripting1.aspx of the Web04 project).

Concrete types are structs, classes, enumerations, delegates, records, and unions. Type names are traditionally lowercase in OCaml, and F# code has generally followed this pattern. However, as F# matures as a language, it is moving much more to follow standardized .NET idioms.

Note In 10g Release 2, this feature is planned to be supported in the JDBC thin driver, too. The examples

in this book use an OCI driver on a 10g Release 1 database, but the basic concepts should remain the same with a thin driver.

Microsoft.FSharp.Core.dll <Company>.<Component>.dll Some, Add, Success Do not use a prefix in public APIs. Optionally use a prefix when internal, such as type Teams = TAlpha | TBeta | TDelta.

The last thing you need is to populate the list upon first arriving at the client. We ll save this for the next section, where we discuss some built-in support the Page type has for scripting. There are a number of improvements you can make to the sample. This code looks nothing like the script code you started with. Maintenance may be difficult. It s good to keep the original static script around; you can use it to troubleshoot and change the behavior of the page, and then you can map those changes into the script-generating code. The biggest downside shows up when your page does a postback. ddlListB won t behave as you d expect it to. On a postback, you d probably write some code to access ddlListB.SelectedValue to do some processing. This would not be populated. The DropDownList relies on a collection of list items and view state. You never populated the list server side, and so no ViewState exists for it. To retrieve this value, you have to resort to the old-fashioned ASP-style syntax of Request.Form["ddlListB"]. For this reason you ll probably want to pull the code for these lists out into their own control. Even a User Control would suffice (if you did not plan to use it in more than a single application). This way you could add a public property to the control to expose the second list s value, and not have to burden consumers of your control with details of its implementation. While you re at it, you may as well generalize its functionality to create two lists against any data source, instead of just the XML file in this example.

Proxy authentication allows you to connect on behalf of another user without supplying the user s password (provided appropriate privileges have been granted to enable this). The way proxy authentication works is simple. You create an OCI connection pool consisting of connections of the proxy user account. Then you can create sessions on top of these physical connections for the individual database users (as demonstrated in the previous chapter). This solves the problem of password management simply by not requiring the proxied user s password. For example, assume that the proxy account is called midtier, and you want to create two sessions of db_clerk1 and one session of db_manager1 on top of a single physical connection from the pool of midtier connections. Figure 15-4 shows one such proxy connection carrying three of these sessions.

CurrentName IDisposable ToString Microsoft.FSharp.Core Generally use <Organization>. <Technology>[. <Subnamespace>], though drop the organization if the technology is independent of organization.