29.1 Introduction to Database
Every day we come across many types of information. Some examples are names, addresses, money, date and stock quotes. A professional handles even more data. For example, a doctor needs to keep track of patients’ personal and medical information. The information includes names, addresses, phone numbers, blood pressure readings, blood sugar readings, surgical history, medicines prescribed in the past and more. On the other hand, businesses have to manage a large amount of data pertaining to products and customers. All these data need to be organized into a database for the ease of data management.
In the past, people typically deal with data manually like using cards and folders. However, in present day fast paced global environment and Information age, it is no longer feasible to manage data manually. Most data are now managed using computer-based database management systems.
29.2 Creating a Database Application in Visual Basic 2010
A database management system typically deals with storing, modifying, and extracting information from a database. It can also add, edit and delete records from the database. However, a DBMS can be very difficult to handle by ordinary people or business men who have no technological backgrounds. Fortunately, we can create user-friendly database applications to handle the aforementioned jobs with the DBMS running in the background. One of the best programs that can create such database application is none other than Visual Basic 2010.
To begin building the database project in Visual Basic 2010, launch Visual Basic 2010. You can name your project as Database Project 1 or whatever name you wish to call it. Next, change the default form’s Text property to Contacts as we will be building a database of a contact list. There are a few objects in ADO.NET that are required to build the database. There are:
- SqlConnection- to connect to a data source in SQL Server
- DataTable -to store data for navigation and manipulation
- DataAdapter- to populate a DataReader
The aforementioned objects belong to the System.Data and the System.XML namespace. Therefore, we have to reference them in the beginning before we can work with them. To reference the ADO.NET object, choose project from the menu then select Database Project 1 properties to display the project properties. Next click the References tab to show the active references for the project, as shown in Figure 29.1
Under imported namespaces, make sure system.data, System.Data.Sqlclient is selected, otherwise, check them. Having done that you need to click the Save All button on the toolbar and then return to the Visual Basic 2010 IDE.
We shall proceed to create the connection to the database source file in the next lesson.