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C HA PTER 7 XML IN ADO. NET
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Note DiffGram is a special XML format that stores original as well as current row values. SQL Server 2000
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introduced capabilities to update the database via UpdateGrams. DiffGram is a subset of UpdateGram and can be used to update a SQL Server database over the Web.
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If selected, the check box opens the saved XML file in a browser. The Save button actually writes the DataSet to the specified file. The Click event handler of the Save button contains the code shown in Listing 7-11. Listing 7-11. Using the WriteXml() Method private void button1_Click(object sender, EventArgs e) { DataSet ds = new DataSet(); SqlDataAdapter da = new SqlDataAdapter("SELECT employeeid,firstname,lastname,homephone,notes FROM employees", @"data source=.\sqlexpress;initial catalog=northwind; integrated security=true"); da.Fill(ds, "employees"); if (radioButton1.Checked) { ds.WriteXml(textBox1.Text, XmlWriteMode.IgnoreSchema); } if (radioButton2.Checked) { ds.WriteXml(textBox1.Text, XmlWriteMode.WriteSchema); } if (radioButton3.Checked) { foreach (DataRow row in ds.Tables[0].Rows) { row.SetModified(); } ds.WriteXml(textBox1.Text, XmlWriteMode.DiffGram); } if (checkBox1.Checked) { Process.Start(textBox1.Text); } }
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CHAPTER 7 XML IN A DO.NE T
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The code creates a new DataSet and a SqlDataAdapter. One of the overloads of the SqlDataAdapter constructors accepts the SELECT query and database connection string, and it is this overload that we use. The DataSet is then filled by using the Fill() method of the DataAdapter. The name of the DataTable is specified as employees. Then a series of if conditions check the status of the radio buttons. In each of the if conditions, the WriteXml() method of the DataSet class is called, which writes the contents of the DataSet to the specified stream or disk file. Notice that although each of the if conditions calls WriteXml(), the second parameter XmlWriteMode is different in each case. The XmlWriteMode enumeration governs two things. First, it specifies whether schema information is to be written along with the XML contents. Second, it decides whether the output XML data will contain just the current values or both the original and current values. As you saw in the preceding example, the latter format is called DiffGram. The three possible values of the XmlWriteMode enumeration are shown in Table 7-2. Table 7-2. XmlWriteMode Values
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IgnoreSchema WriteSchema DiffGram
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Writes the contents of the DataSet as XML data. No XSD schema information is written. Writes the contents of the DataSet as XML data. Also, writes XSD schema information along with the data. Writes the contents of the DataSet as DiffGram XML markup. The DiffGram stores the current as well as original column values.
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Notice the if condition for radioButton3. Because we have not made any changes to the DataSet as such, the code deliberately marks each row as modified. This is done by using the SetModified() method of the DataRow class. This way, we will be able to see how the DiffGram format stores old and new values. Finally, the saved XML file is opened in a browser by using the Start() method of the Process class. Figure 7-7 shows a sample run of the application without saving any schema information. Similarly, Figures 7-8 and 7-9 show the output XML file with schema information and DiffGram, respectively. Notice how the schema information is emitted in Figure 7-8. Also, examine Figure 7-9 carefully. This XML output is in DiffGram format. See how the <diffgr:before> section stores the original values of the DataRows, whereas the current values are displayed at the top.
C HA PTER 7 XML IN ADO. NET
Figure 7-7. Writing DataSet as XML without schema information
Figure 7-8. Writing DataSet as XML with schema information
CHAPTER 7 XML IN A DO.NE T
Figure 7-9. Writing DataSet as XML in DiffGram format
Saving Only the Schema
The WriteXml() method writes data and optionally XSD schema information. What if you need to extract only the schema information and not the data itself The WriteXmlSchema() method does that job by writing only the schema of the DataSet and not the data. To illustrate the use of WriteXmlSchema(), you can modify the preceding application to include an additional radio button. The new interface of the application is shown in Figure 7-10.
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