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CHAPTER 7 XML IN A DO.NE T
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To loop through the results, you can use its Read() method that advances the record pointer to the next row. Note that DataReader does not have MoveXxxx()-style methods as ADO has. This helps to avoid the common programming mistake of forgetting to call MoveNext() in Do...While loops. Also, note that for DataReader only one row remains in memory at a time, so DataReader can improve the performance and memory footprint of your application significantly as compared to traditional dynamic cursors.
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DataAdapter (SqlDataAdapter and OleDbDataAdapter)
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In the section about disconnected data access, you learned that ADO.NET offers a way to work with disconnected data via the DataSet class. The DataSet needs to be populated from the data residing in the data source. Similarly, after you are finished with the data modifications, the data needs to be updated in the underlying data source, and the DataAdapter class is designed just for that. Note that the DataSet class is the same for any kind of data provider (SQL or OLEDB), but DataAdapter has separate implementations (SqlDataAdapter and OleDbDataAdapter). This is because, unlike DataSet, which is totally unaware of the underlying data source, DataAdapter needs to communicate with the underlying data source.
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DataSet
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The DataSet object is at the heart of ADO.NET disconnected architecture. DataSet is somewhat analogous to the Recordset object of ADO, but, unlike Recordset, DataSet always works in a disconnected fashion. Also, DataSet can have more than one set of data. A DataSet is represented as an XML document over the network, which makes it a great choice for passing data from one component layer to another. It can also be used to integrate heterogeneous systems. A DataSet can be considered an in-memory representation of a database. Just as a database consists of one or more tables, a DataSet consists of one or more DataTable objects. Each DataTable is a set of DataRow objects. Just like a database, DataTable objects can have relations and constraints. Also, they need not always be populated from the database but can be created and populated programmatically also.
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In the preceding sections, you saw that the SqlCommand object is used to execute SQL commands and stored procedures against a database. To execute SELECT queries and retrieve the results as XML data, you need to use the ExecuteXmlReader() method of the SqlCommand object. This method executes the SELECT query or stored procedure and returns the results in the form of an XmlReader object. You can then navigate through and access values from the XmlReader, as you learned in 3.
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Using the ExecuteXmlReader() Method
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When you use the ExecuteXmlReader() method of SqlCommand, the SELECT query must have the FOR XML clause specified in it. You will learn about the FOR XML clause in detail in 10. For
C HA PTER 7 XML IN ADO. NET
now it is sufficient to know that this clause ensures that an XML representation of the result set is returned and it must be present. To see how ExecuteXmlReader() works, you will develop an application like the one shown in Figure 7-1.
Figure 7-1. Application for retrieving SQL Server data in XML format As you can see, the application consists of a text box for entering SELECT queries. The Execute button allows you to execute the query. The XML results returned from the query are displayed in a browser window. Before you write the code for the Click event handler of the Execute button, make sure to including the namespaces as shown in Listing 7-1. Listing 7-1. Importing Relevant Namespaces using using using using using System.Data; System.Data.SqlClient; System.Xml; System.IO; System.Diagnostics;
The Click event handler of the Execute button contains the code shown in Listing 7-2. Listing 7-2. Using the ExecuteXmlReader() Method private void button1_Click(object sender, EventArgs e) { SqlConnection cnn = new SqlConnection(@"data source=.\sqlexpress;initial catalog=northwind;integrated security=true"); SqlCommand cmd = new SqlCommand(); cmd.Connection = cnn; cmd.CommandType = CommandType.Text; cmd.CommandText = textBox1.Text + " FOR XML AUTO"; cnn.Open();
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