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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.

This specifies that additional debugging information should be switched off (the default). Setting this flag to true is a recommended first step when debugging problems:

var a = ['Item 1', 'Item 2', 'Item 3', 'Item 4']; var b = Array.contains(a,"Item 2"); // returns 'true' Var c = Array.contains(a,"Green"); // returns 'false'

System.setProperty("sun.security.krb5.debug", "false");

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.

We then invoke the jaasLogin() method to retrieve a subject. The method establishes a LoginContext object, which is populated with the name of the entry from our configuration file (ClientAuthentication) and a CallbackHandler. When the login method is invoked on the LoginContext object, the LoginModule specified in the configuration file is instantiated. This then establishes a connection to the appropriate server, and carries out the appropriate login conversation (in our case to a Kerberos 5 server). When additional information is required to complete the login, the handle(Callback[]) method of our CallbackHandler

You can remove the first item from an array (a process called dequeuing) by using the Array.dequeue command and passing it the array in question. This is useful if you want to implement a first-in, first-out list using a JavaScript array, with the add method adding to the tail of the list, and the dequeue method removing from the head of the list.

is invoked with the array populated with suitable Callback objects. It is the client s responsibility to populate these Callback objects with appropriate data. In the case of a Kerberos 5 login, we require only a username and password. The following code carries out this task:

If you select the newly added radio button titled Save Schema, only the schema of the DataSet will be saved. Listing 7-12 shows the modified version of the code. Listing 7-12. Using the WriteXmlSchema() 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 (radioButton4.Checked) { ds.WriteXmlSchema(textBox1.Text); } if (checkBox1.Checked) { Process.Start(textBox1.Text); } } Notice the code marked in bold. The code calls the WriteXmlSchema() method by passing the file in which the schema information will be stored. You will observe that the schema obtained by this method is the same as that obtained by the WriteXml() method with XmlWriteMode.WriteSchema. However, no data is written to the file.

var a = ['Item 1', 'Item 2', 'Item 3', 'Item 4']; var b = Array.dequeue(a); // b will now contain 'Item 2', 'Item 3', 'Item 4'

for (int i = 0; i < callbacks.length; i++) { Callback callback = callbacks[i]; if (callback instanceof NameCallback) { ((NameCallback) callback).setName(principal); } else if (callback instanceof PasswordCallback) { ((PasswordCallback) callback).setPassword( password.toCharArray()); } }