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A globally unique identifier (GUID) is a 16-byte value that is guaranteed to be globally unique (it is generated through a complex algorithm involving your network MAC address) and can be easily generated in .NET with the System.Guid.NewGuid() method call. The fact that GUIDs are always guaranteed to be globally unique makes them suitable to be used internally as record identifiers. It is not uncommon to represent for example, user, customer, or invoice IDs as GUID values in the database. Oracle does not provide a data type that can natively store GUID values. The Oracle ROWID and UROWID data types, although sounding conspicuously like GUID data types, do not resemble a GUID in any way: ROWIDs store the address of a particular row in a table. The closest (and most efficient) match we have is the RAW(16) data type. The RAW data type is basically a binary data type of a configurable size. RAW(16) suits us well; it stores all 16 bytes required for a GUID value. Let s try saving and loading a GUID from an Oracle table. Before you run the code sample below, create the table shown in Listing 4-24 via SQL*Plus.

You can customize this section to perform your own error handling or logging. However, once again you are forced to place your database code in the form. This is one of only two areas of code that you can customize with automatic data binding. The other area is the code that saves the record and triggers and update when the user clicks a button in the navigation bar:

Unified Modeling Language (UML)

private void bindingNavigatorSaveItem_Click(object sender, EventArgs e) { if (this.Validate()) { this.productsBindingSource.EndEdit(); this.productsTableAdapter.Update(this.storeDataSet.Products); } else { MessageBox.Show(this, "Validation errors occurred.", "Save", MessageBoxButtons.OK, MessageBoxIcon.Warning); } } This just isn t flexible enough for a professional application. In fact, trying to use this design is likely to leave you with an application that s poorly organized and difficult to maintain or optimize. In the following sections, you ll consider whether there s any way to redeem this design-time data-binding support.

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CREATE TABLE "EDZEHOO"."GUIDTEST" (

There is one feature that you get with automatically generated data sources that can be worthwhile strongly typed DataSet classes. When you add a data source, you end up with several new classes: One table adapter class for each table in the data source. One derived DataSet class for your database. One DataRow and one DataTable class for each table in the data source. The table adapter encapsulates the data access logic. It plays the same conceptual role as StoreDB in the earlier examples, although it s much less flexible. You may use the table adapter for quick one-off mockups, but you re unlikely to use it in a large-scale application. The DataSet, DataRow, and DataTable classes are data objects that model your data. They derive from the familiar DataSet, DataRow, and DataTable classes you already know, but they hard wire in the database schema. For example, in the previous example you ll end up with a ProductsDataTable and a ProductsDataRow class, which have the structure of the Products table hard wired into them. These custom data classes have two advantages. First, when you query information from the database no schema information is needed because it s already in your objects. Thus, ADO.NET can fill the DataTable more efficiently (without making an initial query to determine the table schema). The other advantage is that it s easier to program with these classes because you can use strongly typed properties instead of string-based field and table lookup. For example, you could take this code:

The need to accurately model complex system concepts and functions has existed from the early days of software engineering How do you represent all these interrelated actions and complexities in a way that developers and other team members can understand By the same token, as software projects became more complex, and more people were involved in the creation of software, it became necessary to have a common way of expressing software system concepts, like object classes and object associations Unified Modeling Language (UML) has become the de-facto standard in addressing this need3 UML gives software developers a tool set for mapping out a conceptual model of their systems through a set of defined diagramming techniques Each type of diagram in the UML toolbox addresses a different facet of the overall design process.

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