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Unlike the SqlDataSource and the ObjectDataSource, the XmlDataSource doesn t support editable binding. You can confirm this fact with a simple test just bind the XmlDataSource to GridView, and add a CommandField with edit buttons. When you try to commit the update, you ll get an error informing you that the data source doesn t support this feature. However, the XmlDataSource does provide a Save() method. This method replaces the file specified in the DataFile property with the current XML content. Although you need to add code to call the Save() method, some developers have used this technique to provide editable XML data binding. The basic technique is as follows: when the user commits a change in a control, your code retrieves the current XML content as an XmlDocument object by calling the XmlDataSource.GetXmlDocument() method. Then, your code finds the corresponding node and makes the change using the features of XmlDocument (as described earlier in this chapter). You can find and edit specific nodes, remove nodes, or add nodes. Finally, your code must call the XmlDataSource.Save() method to commit the change. Although this approach works perfectly well, it s not necessarily a great way to design a website. The XML manipulation code can become quite long, and you re likely to run into concurrency headaches if two users make different changes to the same XmlDocument at once. If you need to change XML content, it s almost always a better idea to implement the logic you need in a separate component, using the XML classes described earlier.

All file storage operations are handled by instances of , which lives at , with the default storage system specified by an import path in the setting A storage system encompasses all the necessary functions for dealing with how and where files are stored and retrieved By using this extra layer, it s possible to swap out which storage system is used, without having to make any changes to existing code This is especially important when moving from development to production, since production servers often have specialized needs for storing and serving static files In order to facilitate this level of flexibility, Django provides an API for dealing with files that goes beyond the standard function and associated object provided by Python Earlier in this chapter, Django s object was described, explaining what features are available for dealing with individual files.

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Now that you ve taken an exhaustive look at general-purpose XML and .NET, it s worth taking a look at a related topic the XML support that s built into ADO.NET. ADO.NET supports XML through the disconnected DataSet and DataTable objects. Both have the built-in intelligence to convert their collection rows into an XML document. You might use this functionality for several reasons. For example, you might want to share data with another application on another platform. Or you might simply use the XML format to serialize to disk so you can retrieve it later. In this case, you still use the same methods, although the actual data format isn t important. Table 12-2 lists all the XML methods of the DataSet. Table 12-2. DataSet Methods for Using XML

GetXml() WriteXml()

Retrieves the XML representation of the data in the DataSet as a single string. Writes the contents of the DataSet to a file or a TextWriter, XmlWriter, or Stream object. You can choose a write mode that determines if change tracking information and schema information is also written to the file. Reads XML data from a file or a TextReader, XmlReader, or Stream object and uses it to populate the DataSet. Retrieves the XML schema for the DataSet XML as a single string. No data is returned. Writes just the XML schema describing the structure of the DataSet to a file or a TextWriter, XmlWriter, or Stream object. You can choose to include the schema at the beginning of the document.

ReadXml() GetXmlSchema() WriteXmlSchema()

When looking to store, retrieve or list files, however, storage systems have a different set of tools available Deletes a file from the storage system Returns a Boolean indicating whether the specified name references a file that already exists in the storage system Returns a version of the given name that s suitable for use with the current storage system If it s already valid, it will be returned unchanged One of only two methods with default implementations, this will return filenames suitable for a local filesystem, regardless of operating system Given a valid name, this returns a version of it that s actually available for new files to be written, without overwriting any existing files Being the other method with a default behavior, this will add underscores to the end of the requested name until an available name is found.

ReadXmlSchema() InferXmlSchema()

Reads an XML schema from a file or a TextReader, XmlReader, or Stream object and uses it to configure the structure of the DataSet. Reads an XML document with DataSet contents from a file or a TextReader, XmlReader, or Stream object and uses it to infer what structure the DataSet should have. This is an alternate approach to using the ReadXmlSchema() method, but it doesn t guarantee that all the data type information is preserved.

.NET 2.0 adds support for XML directly to the DataTable class. This means you can use the ReadXml(), WriteXml(), ReadXmlSchema(), and WriteXmlSchema() methods of the DataTable to read or write XML for a single table in a DataSet.

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