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When performing versioning, you have to take several parts of your application into consideration. Of course, you have to think of your server-side implementation and the interfaces of the remoteable objects, as well as the messages sent across the wire between the client and the server. All these different aspects require some different ideas in terms of application design, which have to be taken into consideration from the very first version of the application. When it comes to server-side implementation, you have to think about the possibility that a change in the server s implementation breaks client applications. But I think that this happens only under specific circumstances, for example, if the client is dependent on the state of the server s object. The easiest way to avoid this is to not use stateful objects on the server for both ease of implementation as well as scalability (think of load balancing). Much more often interfaces on the server s objects have to be broken, or the format of messages sent across the wire will change over time. These are really hard problems that have to be solved when versioning distributed applications, because in large enterprise applications you have to make sure that even old client applications that won t be updated for any reason will continue working with your application. This basically means you still have to support the old interfaces on your server application, and you still have to understand old serializable messages (I will go into detail about this issue later in this chapter).
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Listing 10-9. The Unit Test Implementation Class for the JDBC-Based User Account DAO
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s Warning In SQL Server 2000, large data was stored in NTEXT, TEXT, and IMAGE data types. These data types are deprecated and will likely be removed in the future. If you work with legacy applications, you should consider converting NTEXT, TEXT, and IMAGE to NVARCHAR(MAX), VARCHAR(MAX), and VARBINARY(MAX), respectively. However, the System.Data.SqlDbType enumeration does not yet include members for these data types, so we use VARCHAR(MAX) and VARBINARY(MAX) for column data types but Text and Image when specifying data types for command parameters.
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The function writeValue takes an arbitrary value and writes a binary representation of its underlying object graph to the given I/O stream. The function readValue reverses this process, in much the same way that unbox reverses the process performed by box. Here are the implementations of the functions in terms of the .NET binary serializer located in the namespace System.Runtime.Serialization.Formatters.Binary: open System.IO open System.Runtime.Serialization.Formatters.Binary let writeValue outputStream (x: 'T) = let formatter = new BinaryFormatter() formatter.Serialize(outputStream, box x) let readValue inputStream = let formatter = new BinaryFormatter() let res = formatter.Deserialize(inputStream) unbox res Note that box and unbox are used in the implementation, because the Serialize and Deserialize functions accept and return a value of type obj. Here is an example of how to use the functions to write a value of type Microsoft.FSharp.Collections.Map<string,string> to a FileStream and read it back in again: open System.IO let addresses = Map.ofList [ "Jeff", "123 Main Street, Redmond, WA 98052"; "Fred", "987 Pine Road, Phila., PA 19116"; "Mary", "PO Box 112233, Palo Alto, CA 94301" ] let fsOut = new FileStream("Data.dat", FileMode.Create) writeValue fsOut addresses fsOut.Close() let fsIn = new FileStream("Data.dat", FileMode.Open) let res : Map<string,string> = readValue fsIn fsIn.Close() The final result of this code when executed interactively is as follows: > res;; val it : Map<string,string> = seq [[Fred, 987 Pine Road, Phila., PA 19116] {Key = "Fred"; Value = "987 Pine Road, Phila., PA 19116";}; [Jeff, 123 Main Street, Redmond, WA 98052] {Key = "Jeff"; Value = "123 Main Street, Redmond, WA 98052";}; [Mary, PO Box 112233, Palo Alto, CA 94301] {Key = "Mary"; Value = "PO Box 112233, Palo Alto, CA 94301";}]
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Figure 9-6. The Registration Information section contains the basic information for a user account.
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SQL Server allows you to rename objects using the predefined stored procedure sp_rename. In the following example, you ll see how to use it to change a stored procedure s name.
</Person> <Company> <CompanyName>CompanyName_2</CompanyName> </Company> <Address> <AddressLine>AddressLine_1</AddressLine> </Address> All messages in BizTalk are passed through the MessageBox wrapped in a SOAP envelope. A SOAP envelope consists of two sections: the Header and the Body, wrapped in an envelope, as shown in Listing 2 3. The Header can be common across all schemas, while the Body contains the actual XML instance of any given schema. Adding and accessing fields within orchestrations at the SOAP Header level is made available in a simple and straightforward way. This is a powerful and useful tool that has multiple applications depending on the solution architecture. Listing 2 3. Sample SOAP Envelope Structure <soap:Envelope xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:soap="http://schemas.xmlsoap.org/soap/envelope/" <soap:Header> <MessageId>uuid:bbbb-cccc-dddd-eeee</MessageId> <TraceFlag>true</TraceFlag> </soap:Header> <soap:Body> <Person><Name>Name_1</Name></Person> </soap:Body> </soap:Envelope> In Listing 2 3, the Header contains two fields and the Body consists of an XML document that is an instance of the Person schema. This is an actual representation of what a document looks like when placed in the MessageBox by an orchestration when using the SOAPHeader property schema and Person schema described in this recipe. By default, BizTalk will strip the XML document out of the envelope s Body and deliver it to the appropriate subscribers. These subscribers see the XML document that was originally contained in the Body and do not have context to the Header. However, if a SOAPHeader property schema has been defined, the subscriber will also have access to the envelope s Header information. The SOAPHeader property schema shows which fields will be promoted and available at the Header level on all schemas within a given project. The SOAPHeader property schema must reference the namespace http://schemas.microsoft.com/BizTalk/2003/SOAPHeader and have each of the elements on it with their Property Schema Base set to MessageContextPropertyBase. The steps for creating a SOAPHeader property schema are as follows: 1. 2. Add a new schema to a BizTalk project. In the Properties window of the schema, set the Target Namespace to the BizTalk SOAPHeader namespace and the Schema Type to Property, as shown in Figure 2 42.
@property (nonatomic, readonly) NSInputStream *inputStream @property (nonatomic, readonly) NSOutputStream *outputStream
To make your message board venture succeed, you ll want to have a grasp of the important concepts of successful message board administration.
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If we installed SQL Server with mixed mode, this means we can use either Windows authentication, as has just been covered, or SQL Server authentication. How does mixed mode differ from Windows authentication mode To start with, you need to supply a user ID and password to connect rather than Windows taking the ID of the logged in account. There is no assumption that the username supplied is a valid ID. Using mixed mode is also appropriate in many cases when working with ISPs. To clarify this, if you are working on your remote data at a local client machine, the remote machine would need to know the credentials of your login, and the easiest method is to use SQL Server authentication. There is also another argument for mixed mode. We may wish for some reason (for example, for auditing purposes) that the user log on to SQL Server using a different username from that of his or her Windows account. We could be working on a large SQL Server development project that will have developers joining and leaving the team as the need arises. In this case, it might be necessary to create temporary usernames, as opposed to permanent IDs linked to the developers Windows usernames. In SQL Server, we could create usernames of Developer1, Developer2, etc. These usernames can have different access rights within SQL Server. Another situation would be the case of an Internet-based application where there is just no way we could create a username for every visitor to our site. Therefore, we would create generic login ID using a specific ID created for the web site. Whatever the reason, there is a need to have usernames not linked with the Windows usernames. You will learn how to add usernames to SQL Server (as opposed to adding Windows users) when I talk about security in 4. This leaves one area of security left that needs to be discussed here: the sa login.
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