.net barcode reader camera INTRODUCTION TO DATABASE TESTING in Font

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CHAPTER 8 INTRODUCTION TO DATABASE TESTING
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already have a defect to report. So, the Database Explorer window allows you to visually verify that the database structure is correct.
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DATABASE EXPLORER AND SERVER EXPLORER
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If you are using the full version of Visual Studio and not just the Express version, you will need to use Server Explorer instead. Database Explorer only exists in the Express product; all other Visual Studio products use Server Explorer. (Since the Express Editions are in Beta as of this writing, this may change). Still, the process of opening up a connection is similar in either window; you just have to click the Connect To Database button, which looks like a cylinder with a power cord (see Figure 8-3), and choose the correct Data Source from the list. Once you do that, you will have to point to the server and database you wish to open. Although Database Explorer is a bit easier to use, both work about the same way. We chose to use the Express versions of Visual Studio 2005 because they have most of the features needed and are inexpensive for our readers (free at the time of this writing). That being the case, we concentrate on pointing out important features of using Database Explorer in this chapter, but you should be able to follow along with Server Explorer without much trouble.
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Figure 8-3. Opening a connection using Server Explorer
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In Figure 8-2, we have expanded the Categories table icon and clicked on the CategoryName field. If you look at the Properties window in Figure 8-2, you can see that properties of the CategoryName field are displayed. (The properties appear grayed out only because you cannot modify them from this window.) This tells you the data type i.e., the kind of data this field can contain. The OleDbType.WChar data type might not mean a lot to you at first; however, any time you see a data type that contains the letters Char means this field may contain any kind of character data. Character data means any letters or numbers (so in character data types, the numbers will be treated just as if they are characters, which means that you can t do numeric operations on them, like adding or subtracting). Other kinds of data types will indicate numeric fields, such as integer (whole numbers) or floating-point numbers, or other kinds of data such as currency, binary, or date fields. All databases have a rich variety of data types for developers to choose from. The correct choice of data type for fields is very important in good database design. Seeing the choices of data types can help you choose the correct kinds of data with which to test the fields in your application; this is often referred to as field-level integrity testing. Note that the field s size is also indicated in the Properties window of Figure 8-2. The CategoryName field is 15 characters long. This is helpful in creating appropriate test data for
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CHAPTER 8 INTRODUCTION TO DATABASE TESTING
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this field. It also is important to note any differences in the sizes listed in the database for fields and their sizes in the presentation layer of the application. For example, what if the application you re testing has a web page that allows for 20 characters in the CategoryName field, but you can see here that the database allows only 15 Here you could create a test case to input 20 characters into the web application s CategoryName field and see what happens to it in the database. Very likely you would see data truncation, and you could then report that as a defect. Of course, it s also possible you would see a worse error, too, such as an error message or even a failure! So viewing data types and sizes in the Database Explorer window is an important way to help verify data integrity at the field level. Exercise 8-1 is a short exercise that shows you the steps for connecting to and inspecting a database and its objects.
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