Visual Basic.NET How to Program (PDF)

888 Database, SQL and ADO .NET Chapter 19
Outline
19.1 Introduction
19.2 Relational Database Model
19.3 Relational Database Overview: Books Database
19.4 Structured Query Language (SQL)
19.4.1 Basic SELECT Query
19.4.2 WHERE Clause
19.4.3 ORDER BY Clause
19.4.4 Merging Data from Multiple Tables: INNER JOIN
19.4.5 Joining Data from Tables Authors, AuthorISBN,
Titles and Publishers
19.4.6 INSERT Statement
19.4.7 UPDATE Statement
19.4.8 DELETE Statement
19.5 ADO .NET Object Model
19.6 Programming with ADO .NET: Extracting Information from a DBMS
19.6.1 Connecting to and Querying an Access Data Source
19.6.2 Querying the Books Database
19.7 Programming with ADO .NET: Modifying a DBMS
19.8 Reading and Writing XML Files
Summary Terminology Self-Review Exercises Answers to Self-Review Exercises Exercises
Bibliography
19.1 Introduction
A database is an integrated collection of data. Many different strategies exist for organizing
data in databases to facilitate easy access to and manipulation of the data. A database management
system (DBMS) provides mechanisms for storing and organizing data in a manner
that is consistent with the database’s format. Database management systems enable programmers
to access and store data without worrying about the internal representation of databases.
Today’s most popular database systems are relational databases. Almost universally,
relational databases use a language called Structured Query Language (SQL—pronounced
as its individual letters or as “sequel”) to perform queries (i.e., to request information that
satisfies given criteria) and to manipulate data. [Note: The writing in this chapter assumes
that SQL is pronounced as its individual letters. For this reason, we often precede SQL with
the article “an” as in “an SQL database” or “an SQL statement.”]
Some popular, enterprise-level relational database systems include Microsoft SQL
Server, Oracle, Sybase, DB2, Informix and MySQL. This chapter presents examples
using Microsoft Access—a relational database system that comes with Microsoft Office.