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query can t return. To avoid empty columns, create a view that only includes the information you want in the query. For more information on creating views, see 4.

public override int AttributeCount { get {return m_dataRecord.FieldCount;} } // Indexer property that works by index and name public override string this[int i] { get {return m_dataRecord.GetValue(i).ToString();} } public override string this[string name] { get {return m_dataRecord[name].ToString();} } // Return the value of the current attribute public override string Value { get { if(m_readState != ReadState.Interactive) return ""; string buf = ""; if (NodeType == XmlNodeType.Attribute) buf = this[m_currentAttributeIndex].ToString(); return buf; } } The Read method calls into the Read method of the data reader and updates its state accordingly, as shown in the following code. The Close method closes the data reader and resets the internal state. public override bool Read() { // Read the new row and set the state bool canReadMore = m_dataReader.Read(); m_readState = (canReadMore ReadState.Interactive :ReadState.EndOfFile); return canReadMore; } 301

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public override void Close() { m_dataReader.Close(); m_readState = ReadState.Closed; } The XML data reader object can work atop any provider-specific data readers, thus providing a free XML transformation service that is functionally equivalent to ExecuteXmlReader. The so-called XML transformation takes place on the client, but the connection with the database remains open until you close the reader. Note A custom XML reader does not really transform rows into XML schemas. The XmlDataReader object simply causes a data record to look like an XML fragment. You can derive new classes from XmlDataReader to support more complex XML schemas. For such simple XML layouts at least, this approach is even slightly more efficient than using FOR XML. Both solutions use an underlying data reader and expose an XML reader, but XmlDataReader requires no server-side rowset-to-XML transformation.

9. Adjust column widths as necessary. We ll discuss the third option on the options menu, Create Refreshable Web Query, in the next section.

Using XML with OLE DB Data Providers Let's see how to use the XmlDataReader class with an instance of the OLE DB data reader. As usual, you create an OleDbCommand object, execute the command, and get a living instance of the OleDbDataReader class. Next you pass the OLE DB data reader to the XmlDataReader constructor, as shown here: string nwind, query; nwind = "PROVIDER=sqloledb;SERVER=localhost;" + "DATABASE=northwind;UID=sa;"; query = "SELECT employeeid, firstname, lastname," + " title FROM employees"; OleDbConnection conn = new OleDbConnection(nwind); OleDbCommand cmd = new OleDbCommand(query, conn); // Create the XML data reader conn.Open(); OleDbDataReader dr = cmd.ExecuteReader(); XmlDataReader reader = new XmlDataReader(dr); ProcessDataReader(reader); reader.Close(); conn.Close(); The reader can be used on demand to walk through the contents of the result set, as shown here: private void ProcessDataReader(XmlReader reader) { ResultsListBox.Items.Clear(); 302

In a refreshable web query, the data is updated either automatically or when you manually refresh the query. Refreshable web queries can return three different kinds of data, all of which are found in SharePoint: a single table (such as a library or list), multiple tables (from a page with multiple web parts), or formatted or plain text. To create a refreshable web query from SharePoint, follow these steps: 1. Open the SharePoint library (or list) in your browser. 2. Select the data you want to query in Excel. 3. Choose Edit Copy from the Internet Explorer menu. 4. Open Excel. 5. Select a cell and paste the data. 6. Before you deselect the pasted range, click the Paste Options button to open the options menu. 7. Choose Create Refreshable Web Query to open the New Web Query dialog box (see Figure 8-4).

while(reader.Read()) ResultsListBox.Items.Add(reader.ReadOuterXml()); reader.Close(); }

emplates go a long way to simplifying the document creation process. But Word offers other tools that will make the process even easier. You can use these tools on their own or in conjunction with templates.

This code generates the output shown in Figure 8-4.

8. Move the pointer to the yellow table-selection icon at the upper left corner of the data table you want to import. A border appears around the data that will be imported. Click the icon to select the data (see Figure 8-5). The icon changes to a green check mark. You can select multiple ranges for a single query. For more control over positioning, create multiple queries in one worksheet.

By design, a data reader object works while connected, and so do any XML readers you might build on top of it However, the NET Framework provides a class that has the ability to expose a disconnected set of rows a DataSet object as XML The DataSet object is designed as a disconnected object with no relationship to any living instance of a DBMS The XmlDataDocument class takes a DataSet object and transforms it into an XML DOM object that is, the XmlDocument class we analyzed in 5 In a nutshell, the XmlDataDocument class provides a client-side and an XML DOM representation of a disconnected set of rows Let's see how The XmlDataDocument Class The XmlDataDocument class inherits from XmlDocument, and although it is defined in the systemdata assembly, it belongs to the SystemXml namespace.

A combined use of the XmlDataDocument class and the DataSet class provides access to the same data using two otherwise alternative approaches: relational and hierarchical When a DataSet class and an XmlDataDocument class are synchronized, they work on the same set of data and detect each other's changes in real time The XmlDataDocument class has a DataSet property that is bound to the related DataSet object The class does not duplicate the DataSet contents but simply holds a reference to the object When the DataSet property is set, the XmlDataDocument registers a listener module for each DataSet event that indicates a change in the data By hooking the events, the XmlDataDocument class can stay in sync with the DataSet contents Event hooking also works the other way around In 5, we saw that whenever an application changes the contents of the XML DOM, a NodeChanged event fires.

9. Click Import to open the Import Data dialog box. 10. Choose a location for the query results and click OK to create the query and return the data to Excel. The External Data toolbar appears when a web query is open in Excel (see Figure 8-6).

Mail Merge is one of the easiest ways to automate the creation of documents. Mail Merge takes information from a data file and inserts it in a file that contains other text.

The XmlDataDocument class registers an event handler for NodeChanged and passes the changes down to the referenced DataSet object..

If you prefer, you can choose Data Import External Data New Web Query to open the New Web Tip

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