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SQL Server 2000 has an external set of components that allow users to access database information in the form of an XML document
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through the HTTP protocol. It is important to understand that these components are external. The most important of these is the ISAPI filter that works within IIS (Internet Information Server a Web server), rather than within SQL Server (see Figure 12-11). It retrieves database information through a SQL Server 2000 OLE DB provider (SQLOLEDB). The OLE DB provider itself has been modified to use a new SQLXML.dll component and to support retuning of the result in the form of a stream. Figure 12-11 illustrates the transfer of information from a client computer to the server and back.
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One new component delivered with SQL Server 2000 is an MMC snap-in called IIS Virtual Directory Management for SQL Server. This snap-in provides a graphical user interface for configuring database access through HTTP. Behind the scenes, it operates using the IIS Virtual Directory Management for SQL Server Object Model.
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This tool can operate on any edition of Windows NT or Windows 2000. Computers with Windows NT must also have IIS 4.0 or higher (or Peer Web Services 4.0 or higher on Windows NT Workstation) and MMC 1.2 or higher. The configuration of database access requires only one operation the administrator needs to create a virtual directory. Apart from the usual information (such as name and path), this virtual directory must contain information for accessing the database (login, password, database, server name, database name, and the type of access allowed through the URL and virtual names). Before we explain what a virtual name is, let s first say that there are three types of access that end users can accomplish through IIS:
dbobject Users can issue a Select statement as a part of an HTTP request and access a database object (such as a table or a view). template Users can specify a template that is a valid XML document and contains one or more Transact-SQL statements. SQL Server will execute, and the information will be included in the result. schema The URL can be specified to execute an XPath query against the annotated mapping schema file.
A virtual name is a part of a URL that specifies and executes a dbobject, a template, or a schema. Let s now demonstrate how you can configure IIS to provide access to SQL Server: 1. Launch IIS Virtual Directory Management for SQL Server: Start | Programs | Microsoft SQL Server | Configure SQL XML Support in IIS. 2. When the application appears on the screen, expand the server to display the Default Web Site. Select it and then select Action | New | Virtual Directory. The application displays the New Virtual Directory Properties dialog box. 3. Set the name and the physical path of the virtual directory (see Figure 12-12).
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Figure 12-12.
Configuring a new virtual directory
4. Select the Security tab and define the authentication method that the user will use to connect to the database:
SQL Server 2000 Stored Procedure Programming
5. Select the Data Source tab to define the server and the database containing the source information:
6. Select the Settings tab to specify the type of access to allow through the virtual directory. For training purposes, let s allow them all (although on a production server you will probably allow only templates or XPath).
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7. Select the Virtual Names tab to associate a specific type of access and optional directory to a virtual name:
8. Click the New button. The application displays the Virtual Name Configuration dialog box. Type a new name, specify a type, select an existing path that will store files, and then click Save:
9. Repeat step 8 to create virtual names for other types, and then click OK in the New Virtual Directory Properties dialog box. The application creates a virtual directory (see Figure 12-13).
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