Ivor Horton's Beginning Visual C++® 2005

Chapter 19. Connecting to Data Sources

In this chapter, I will show you to how you can interface to a database using Visual C++ and the MFC and access the data from it. This is by no means a comprehensive discussion of the possibilities, because a full discussion of database application development using Visual C++ would occupy a very substantial book in its own right. In this chapter, however, you will look at how you can read from a database in this chapter, and in the next chapter you will explore the basics of how you can update a database. Of course, you can access data sources in CLR applications, and you'll look at this in Chapter 22.

In this chapter, you will learn about:

• SQL and how it is used

• How to retrieve data using the SQL SELECT operation

• What database services are supported by MFC

• What a recordset object is, and how it links to a relational database table

• How a recordset object can retrieve information from a database

• How a record view can display information from a recordset

• How to create a project for a database program

• How to add recordsets to your program

• How to handle multiple record views

Database Basics

This is not the place for a detailed dissertation on database technology, but I do need to make sure that we have a common understanding of database terminology. Databases come in a variety of flavors but the majority these days are relational databases. It is relational databases that I will be talking about throughout this chapter.

In a relational database, your data ...