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Since database design and development is a major undertaking that would at present get in the way of our real goal of developing Visual Basic NET code to access databases, we will make use of one of Microsoft s existing database examples to describe a three-tiered approach to database applications programming The Biblio example database has been provided with versions of Microsoft Access, Visual Studio and Visual Basic over several versions, the most recent being Biblio2002 (see Figure 125) This is a database containing related tables of Publishers, Authors and books (Titles), and includes one link table (Title Author) to take care of the manyto-many relationship between authors and books (one author can have written many books, one book can have many authors) as described earlier (see Figure 123) If you have installed a version of MSDE then you will be able to access this database using the classes in the SystemDataSqlClient namespace If not, you should have the Access equivalent database le (Biblio2002mdb) Alternatively, almost any earlier version of the Bibliomdb Access database should be adequate for the program examples here One useful thing to notice about Figure 125 is that although it was drawn to show the relationships between database tables in the Biblio database, it is in fact a UML class diagram and can be used to infer the class model of an application program for working with this database When we come to writing code to manipulate the database later in this chapter, we will create a rationalized version of this model (there will be no need for a link table in the object-oriented world) Before that, we should have a look at a simpler situation where we can access the information in one of the tables

The following test program illustrates assignment conversions on reference values, but fails to compile, as described in its comments This example should be compared to the preceding one

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public class Point { int x, y; } public interface Colorable { void setColor(int color); } public class ColoredPoint extends Point implements Colorable { int color; public void setColor(int color) { thiscolor = color; } } class Test { public static void main(String[] args) { Point p = new Point(); ColoredPoint cp = new ColoredPoint(); // Okay because ColoredPoint is a subclass of Point: p = cp; // Okay because ColoredPoint implements Colorable: Colorable c = cp;

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// Assignments to variables of array type: byte[] b = new byte[4]; a = b; // error: these are not arrays // of the same primitive type Point3D[] p3da = new Point3D[3]; Point[] pa = p3da; // ok: since we can assign a // Point3D to a Point p3da = pa; // error: (cast needed) since a Point // can't be assigned to a Point3D

The rst requirement to enable us to access a database from a NET program is to establish a connection to it, for which we use a connection class Version 10 of Visual Studio NET provides two types of connection class: SqlConnection and OleDbConnection The rst is for use with Microsoft SQL server and MSDE database environments and provides a very ef cient connection to either of these database servers The second type is a generic database connection class that uses OleDb, which stands for Database Object Linking and Embedding OleDb is an earlier database connection model used extensively in Visual Basic 60 programs to access database engines Because the OleDb connection class must connect to a database using an additional layer of code running in a separate process, it is far less ef cient than the direct access route that the SqlConnection class provides To create a connection, the Connection object must be given a connection string The connection string is simply a piece of text that contains the database access details For a SqlConnection, this includes the name of the server, the catalogue (database) to open, the security protocol by which the object is to be granted access, the name of the workstation from which the database program is running, etc A connection string for an OleDbConnection will vary in format depending on the database server that it is to access A connection to an Access database le can be quite simple compared to some of the server-based variants A typical connection string (the one that connects to the example databases on my laptop PC) is shown broken into sections in Table 124 Note that the sections shown would be joined into a single string, with semicolon delimiters between sections Creating a connection string can be a complex business if you want to write it yourself, but fortunately Visual Studio gives us an easy way to generate one Using the Server Explorer window (which normally inhabits the same location in the Visual Studio IDE as the Toolbox, on a separate tab) you can drill down to a speci c server and drag the required database element on to a form This will create two components in the form s component tray: a Connection object and a Data Adapter object You can then determine the connection string from the properties of the connection Appendix 2 shows you how to create connections and.

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