vb.net qr code sample Figure 9-20. northwndDataSet.xsd in DataSet Designer in Visual Basic .NET

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Figure 9-20. northwndDataSet.xsd in DataSet Designer
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s You could have simply double-clicked northwndDataSet.xsd in Solution Explorer to get to DataSet Tip
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Designer, but we wanted you to see an alternative. VBE is full (perhaps too full) of them.
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CHAPTER 9 s INTRODUCING DATA BINDING
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Click CustomersTableAdapter in the diagram and look at the Properties window. All four commands are listed. Expand any of them and you see the SQL that was generated. For example, expand the UpdateCommand property, click the CommandText label, and click the ellipsis that appears over the command text value. You see the Query Builder window, as in Figure 9-21. You can customize the SQL for any command with Query Builder.
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Figure 9-21. Query Builder window
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s Many (perhaps most) professional Windows application developers believe that the best practice is to Tip
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minimize reliance on generated code, especially for updates. More precise management of how a control interacts with a database is often desirable and sometimes essential. That s why we focus on console applications in this book. They force you to write your own code, so you can code whatever you need, even for Windows applications. At any rate, it gives you insight into what the code generated for a control has to do, so you can dig into it and see what it s doing when things don t work as expected.
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This chapter covered the fundamentals of data binding and showed you how to use both simple and complex data binding. It then focused on data grids to display and update database data. This was only a start, and you ll find plenty of other things to study about
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CHAPTER 9 s INTRODUCING DATA BINDING
data binding as you advance in Visual Basic database programming, but we hope you re now comfortable with the concepts and can clearly see that knowing how to code data access and update logic yourself for console programs is still extremely important, even when all code is generated for you by Windows Forms (and Web Forms) controls. In the next chapter, you ll return to T-SQL and see how to create tables and relationships between tables.
CHAPTER
Understanding Tables and Relationships
n this chapter we ll discuss tables and relationships between tables. These issues are fundamental database design issues, but this isn t a tutorial on the art of database design, which is one of the most challenging tasks in computing, a task that is seldom done all that well. Our goal here is to familiarize you with some concepts and terminology that are essential for navigating a relational database, that is, move from table to table to access related data, which we ll do in 11. In this chapter, we ll cover the following: Creating and dropping tables Relationships among tables Primary and foreign keys Data (entity and referential) integrity Normalization and denormalization
Managing Tables
Tables are the fundamental components of a relational database. In fact, both data and relationships are stored simply as data in tables. Tables (called tuples, which rhymes with couples, in the relational model) are composed of rows and columns. Each column (called an attribute in the relational model) represents a piece of information. For example, the LastName column in Northwind s Employees table represents the last name for each employee. A table must have one or more columns. In the Employees table, each row is an instance of an employee. A table can have zero or more rows.
CHAPTER 10 s UNDERSTANDING TABLES AND RELATIONSHIPS
Each column in a table is strongly typed, just like every variable in Visual Basic, but a difference (called impedance) exists between SQL data types and Visual Basic types. In s 3 and 7 we described how SQL data types are mapped to .NET types to handle this difference.
Creating Tables
Creating your own tables to experiment with is an easy, and often convenient, thing to do. You can create a table in two ways: Using a visual tool that generates a CREATE TABLE statement Manually coding a CREATE TABLE statement
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