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POST, HEAD, and the other standard HTTP methods. The biggest difference is that WebDAV supports, and for some methods, requires, an XML message body for the WebDAV methods. We explain some of the most commonly used WEBDAV methods in this section. Other methods in the WebDAV specification are MOVE, COPY, LOCK, and UNLOCK. The versioning extensions to WebDAV (RFC 3253) also define the VERSION-CONTROL, REPORT, CHECKOUT, CHECKIN, and UNCHECKOUT methods. Other related specifications are WebDAV Ordered Collections (RFC 3648) and WebDAV Access Control (RFC 3744).

Specifies that attributes of the XML elements are supplying column values for the relational rowset. This is the default. Specifies that attributes of the XML elements are supplying column values for the relational rowset. When combined with a flag value of 2, attributes are picked up as column values and then element values are assigned to the remaining columns. Specifies that elements of the source XML are supplying column values for the relational rowset. This flag can be combined with 1 or 2 and indicates that the consumed data should not be copied to the overflow property @mp:xmltext.

Use the PROPFIND method to access the properties of a resource. The client will ask for a set of properties by name for a given WebDAV resource. The server can also return all of the properties for the resource. The client may also ask for all of the resource s properties along with all of its children s properties up to a given depth. The depth may be 0, 1, or infinity. An infinity depth returns the properties of all resources under the named resource. If your WebDAV client needs to browse through content in the server s repository, the PROPFIND method is useful for determining what the current resource s properties are and the names and types of resources under the current resource. You can easily create a directory listing style interface. If you use a depth of 1 or infinity, your application could cache the properties to improve performance.

Now, from your code, you can use WebConfigurationManager (found in System.Web. Configuration) to access the connection string like this:

Further, the WITH clause of OPENXML specifies the structure of the resultant rowset. The structure can be specified as a comma-separated list of column names and their data types. In our example, we have three columns: EmployeeID, FirstName, and LastName. Note that these column names are the same as the attribute names in the source XML markup. Thus the rowset returned from the SELECT statement and OPENXML is fed to the INSERT statement. The INSERT statement then adds the data to the Employees table. In our example, it will add two rows. After the INSERT operation is done, the XML document is removed from memory by using another system stored procedure: sp_xml_removedocument. This accepts the handle of an XML document loaded previously by using sp_xml_preparedocument and cleans up the memory consumed by the document. Calling sp_xml_removedocument is very important because failing to do so can waste valuable memory of your application.

Client applications use the PROPPATCH method to create, modify, or remove properties on a resource. You can both set and remove one or more properties in a single request. The PROPPATCH method is an all or nothing proposition if any of the requests to set or modify a property fail, none of the requests will be permanent. Any changes before the failed request will be set back to the way they were. If a PROPPATCH call fails, you will get an error message back explaining what the problem was.

string connectionString = WebConfigurationManager.ConnectionStrings["AW"].ConnectionString;

The MKCOL method creates a new collection resource. The request s path should not already exist. If the path does exist, the MKCOL method will not work. Another condition to consider is that the specified path s parent collections must already exist only one collection will be created.

Note A thorough discussion of the OPENXML clause is outside the scope of this book. The aim here is to

15

Visual Studio gives you a nice tool to help you build your connection strings. This tool also works with the Express editions. From the tools menu in Visual Studio, select Connect to Database. The Add Connection dialog box will appear. From here, fill out the details for your database, including the server instance name, the database to connect to, and the sign-on credentials. You can see an example of this in Figure 4-14.