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Note Read-only and forward-only cursors are often called fire-hose cursors. They are one of the most

//set the preferences prefs.setValue("pref1", pref1); prefs.setValue("pref2", pref2); //store the preferences prefs.store(); } }

You can see the full listing for this class, saved as Boat.js, in Listing 14-1.

Initial values may be set for preferences in the portlet deployment descriptor, and these portlet preferences may also be marked read-only in the descriptor. You do not need to define preferences in the deployment descriptor; any preference can be created programmatically. Here is a section of a portlet deployment descriptor that populates two preferences with values for all users and declares one of them to be read-only:

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.

<portlet-preferences> <preference> <name>WelcomeScreen</name> <value>Beginner</value> <modifiable>0</modifiable> </preference> <preference> <name>PreferredDatabases</name> <value>AccountActivity</value> <value>CustomerReturns</value> <value>HumanResources</value> </preference> </portlet-preferences>

// JScript File Type.registerNamespace("Vehicles"); Vehicles.Boat = function(boatType, boatSize, boatName) { this._boatType = boatType; this._boatSize = boatSize; this._boatName = boatName; } Vehicles.Boat.prototype = { getBoatType: function() { return(this._boatType); }, getBoatSize: function() { return(this._boatSize); }, getBoatName: function() { return(this._boatName); }, getBoatDetails: function() { var strDetails = this._boatName + " is a " + this._boatType + " boat that is size: " + this._boatSize; return(strDetails); }, dispose: function() { alert("destroying " + this.getBoatName()); } } Vehicles.Boat.registerClass('Vehicles.Boat');

The WelcomeScreen preference is read-only, and the PreferredDatabases preference is populated with several values. You will need to determine which settings should be portlet-wide configuration settings and which should be user-configurable. In this case, it is conceivable that we could implement an advanced welcome screen in the future, and then provide a way for users to switch themselves. We also present users with a set of preferred databases as a set of defaults that can be updated by each user.

DataAdapter (SqlDataAdapter and OleDbDataAdapter)

To use this class in a page, create a new ASPX page containing a ScriptManager component. This ensures that the ASP .NET AJAX libraries are downloaded to the client at

The user s preferences can be validated when stored by the portlet container, if you create a preferences validator. The portlet container will validate the preferences any time the portlet stores preferences. Also, the portlet container will validate the portlet s preferences if the portal allows users to edit their portlet preferences outside of the portlet with a vendor-supplied administrative portlet or other tools. If the validation fails, none of the preferences is stored. The store() method on the PortletPreferences object either saves all of the preferences or none of them. In addition to a ValidationException, the store() method throws an IOException if the portal cannot access its preferences store or an IllegalStateException if called during render request handling. Each portlet may define a validator that implements the PreferencesValidator interface in the portlet preferences section of the portlet.xml deployment descriptor:

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.