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var MySpeedBoat = new Vehicles.SpeedBoat('Intimidator', '10', 'Arnie', '100cc'); alert(MySpeedBoat.getBoatDetails());

Most organizations do not have an enterprise-wide standard for their content metadata yet. Creating one makes the portal project much easier. Metadata is any descriptive information about content that can provide context, such as the title, creator, timestamp, or description. Traditionally, content cataloging has been a field where librarians excel, but it is certainly possible for content creators to learn how to provide correct metadata. One standard for metadata is the Dublin Core Metadata Element Set (www.dublincore.org/documents/dces/). This set of 15 metadata elements contains fields for Title Creator Subject Description

1

Before seeing an example of how to populate a DataSet and update the data source, you need to understand the architecture of DataAdapter. Take a look at Figure 7-4.

Inheritance like this has limitations the only methods that your class can use are those in the class that it inherits from (and the class that its parent class inherits from, and so on). In cases where you might want to implement common methods across different classes, you cannot do it with inheritance. For example, the speedboat implements throttle opening and closing, and you may want to implement these for a motorcycle also. You can t derive a motorcycle from a boat, so you d end up having to implement them twice, and can end up with differences as a result, making for an untidy API (i.e., Motorcycle could have ThrottleOpen while SpeedBoat has openThrottle), which isn t desirable. The concept of interfaces is defined to help avoid this. You ll see how this works in JavaScript in the next section.

Publisher Contributor Date Type Format Identifier Source Language Relation Coverage Rights The metadata can be stored inside the HTML document within <META> tags, as elements in an XML document, in a database, or in a Resource Description Framework (RDF) file that is separate from the content file. If your content repositories do not have this information, you will need to create the metadata from the existing content. This can be a time-consuming manual process, but commercial tools for metadata extraction are available.

Figure 7-4. DataAdapter architecture As shown in Figure 7-4, DataAdapter uses four Command objects for executing SELECT, INSERT, UPDATE, and DELETE queries. Each command is represented by the SelectCommand, InsertCommand, UpdateCommand, and DeleteCommand properties of the DataAdapter, respectively. Note that these Command objects are the same as you saw in connected data access. However, each one is assigned a specific task of selecting, inserting, updating, and deleting records from the data source. As with standard Command objects, the CommandText property of these command objects can be any valid SQL query or stored procedure. DataAdapter provides the Fill() method that uses the Command object specified by the SelectCommand property and populates the DataSet. If you change the DataSet populated by the preceding method and want to propagate the changes back to the underlying data source, you need to set other properties (InsertCommand, UpdateCommand, and so forth) of valid Command instances. DataAdapter provides another method called Update() that uses the Command objects specified by the InsertCommand, UpdateCommand, and DeleteCommand properties and takes the changes from a DataSet back to the underlying data source.

An interface can be used to specify a function prototype that crosses different class types, and is not dependent on an inheritance tree. You can define functions that need to be in common across such classes those that inherit from different base classes by building them as an interface and having the class implement that interface.