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Then the code creates a SqlCommand object and sets three important properties: Connection, CommandType, and CommandText. The Connection property specifies the SqlConnection instance that is to be used for firing queries. The CommandType property is an enumeration of type CommandType and indicates the type of command being executed. In our example, it is a plain SQL statement and hence set to CommandType.Text. The CommandText property specifies the SQL query or name of the stored procedure to be executed. In our example, the query is being supplied via the text box. While assigning the CommandText property, the FOR XML AUTO clause is appended to the original query. This clause indicates that the results are returned as a sequence of elements, where the element name is the same as the table name, attribute names are the same as column names, and attribute values are the same as column values. The connection is then established by using the Open() method of the SqlConnection class. The query is executed against the database by using the ExecuteXmlReader() method, which, as you saw, returns an instance of XmlReader that points to the result set. In our example, the code creates a physical disk file named temp.xml, iterates through the XmlReader by using its Read() method, and writes the XML data to the file. Notice the use of the ReadOuterXml() method to retrieve the XML data. Also, note that the XML data returned by ExecuteXmlReader() is in the form of elements and doesn t have a root node as such, so the code adds a <root> element to enclose all the returned data.

Here, the first thing we do is declare the SpeedBoat class in the Vehicles namespace. It takes the same base types as Boat, but adds an engine type. Within this function, you pass the initial values to the base class with the initializeBase command, meaning that you don t have to handle boatSize, boatType, and boatName with getters and setters they re already done in the base class. Engine type and current speed are properties unique to the speedboat, so these have local member variables declared for them.

if (failedKeys.size() > 0) { String errMsg = "Preference values must be at least 4 characters long"; throw new ValidatorException(errMsg, failedKeys); } } }

After the writing of XML data is done, the StreamWriter, XmlReader, and SqlConnection are closed by using the Close() method of the respective classes. The Process class (residing in the System.Diagnostics namespace) opens the temp.xml file in a new browser window. If you run the application and supply a SELECT query, you should see the output shown in Figure 7-2.

Here is the portlet.xml deployment descriptor, with the validator reference:

Vehicles.SpeedBoat = function(boatSize, boatType, boatName, engineType) { Vehicles.SpeedBoat.initializeBase(this,[boatSize, boatType, boatName]); this._engineType = engineType; this._currentSpeed = 0; }

< xml version="1.0" encoding="UTF-8" > <portlet-app xmlns="http://java.sun.com/xml/ns/portlet/portlet-app_1_0.xsd" version="1.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/portlet/portlet-app_1_0.xsd http://java.sun.com/xml/ns/portlet/portlet-app_1_0.xsd"> <portlet> <description>Preferences Validation Portlet</description> <portlet-name>PreferencesValidationPortlet</portlet-name> <display-name>Preferences Validation Portlet</display-name> <portlet-class>com.portalbook.portlets.PreferencesValidationPortlet </portlet-class> <expiration-cache>0</expiration-cache> <supports> <mime-type>text/html</mime-type> <portlet-mode>VIEW</portlet-mode> </supports> <supported-locale>en</supported-locale> <portlet-info> <title>Preferences Validation Portlet</title> <short-title>Validation</short-title> <keywords>Preferences,Validation</keywords> </portlet-info>

Figure 7-2. XML data returned by the ExecuteXmlReader() method Figure 7-2 shows the output for the following query: SELECT firstname, lastname FROM employees As you can see, the element name is the same as the table name, and columns appear as attributes.

Now that you have the class declared, you need to create the prototype, which contains the functions that are used as getters, setters, and object methods. The engine type requires a getter and a setter, so these are set up here:

<portlet-preferences> <preferences-validator> com.portalbook.portlets.ExamplePreferencesValidator </preferences-validator> </portlet-preferences> </portlet> </portlet-app>

In the preceding section, you learned the connected way of working by using ADO.NET and XmlReader. However, for building scalable applications, connected data access poses problems of its own. In such circumstances, disconnected data access is strongly preferred. In fact, disconnected data access is the core feature of ADO.NET. Two classes DataSet and SqlDataAdapter together provide a way to work with database data in disconnected mode. The DataSet object is a totally disconnected one and can even be created manually. The SqlDataAdapter class fills the DataSet with data from a database and later propagates the changes made to the DataSet back to the database. In the next sections, you will learn the architecture of DataSet and DataAdapter, and how to work with them.

Figure 7-1 shows an example of the validation in action. Figure 7-2 shows our example portlet with some invalid input.

getEngineType: function(){ return this._engineType; }, setEngineType: function(){ this._engineType = engineType; },

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