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CIS 270—Application
Development II
Chapter 25—Accessing
Databases with JDBC
25.1 Introduction
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A _________ is an organized collection of data.
A database management system (DBMS) is software
that stores and organizes data in a special format.
The most popular type of database is a relational
database where data are stored in related _______.
Popular relational database management systems
(RDBMSs) include Access, Oracle, DB2, and MySQL.
SQL (structured ______ language) is the standard
RDBMS language for manipulating data.
Java communicates with RDBMSs using the ____ API
and drivers that implement it to a given database. 2
25.2 Relational Databases
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A relational database is a logical representation of
data that allows data access w/o consideration of the
__________ structure of the data.
Data are stored in tables. The table represents a
particular entity (Employee). Columns represent the
_________ of an entity (ssn). A ________ represents
a specific instance of an entity (employee John Doe).
A primary ___ for a table is a column (field), or group
of columns, that uniquely identifies a row (record).
A ________ key is a column in one table that is a
primary key in another related table.
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25.3 The books Database
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Four tables:
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authors
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publishers
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isbn, title, editionNumber, copyright, publisherID, imageFile, price
authorISBN
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publisherID, publisherName
titles
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authorID, firstName, lastName
authorID, isbn
authors
authorID
firstName
lastName
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______-relationship diagram
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ERD
n
authorISBN
authorID
isbn
publishers
publisherID
publisherName
n
1
1
n
titles
isbn
title
editionNumber
copyright
publisherID
imageFile
price
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25.4.1-3 SELECT
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SELECT * FROM titles (select all _______ from
titles)
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SELECT isbn, title, price FROM titles (only
certain columns)
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SELECT * FROM titles WHERE copyright > 2000
(only certain ______)
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SELECT * FROM authors WHERE lastname LIKE ‘D%’
(last name starts with D)
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SELECT * FROM authors ORDER BY lastName,
firstName (sort ___________ by default)
SELECT isbn, title, price FROM titles WHERE
price < 20 ORDER BY price DESC
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25.4.4 INNER JOIN
SELECT firstName, lastName, isbn
FROM authors
INNER JOIN authorISBN
ON authors.authorID = authorISBN.authorID
ORDER BY lastName, firstName
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This SQL statement lists the authors with their
ISBNs
SELECT determines the __________
FROM and INNER JOIN determines the two _______
ON specifies the common columns
ORDER BY specifies sorting
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25.4.5-7
INSERT, UPDATE, DELETE
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Insert a row in a table
INSERT INTO authors (firstName, lastName)
VALUES ( ‘Sue’, ‘Smith’ )
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Update a row in a table
UPDATE authors
SET lastName = ‘Jones’
WHERE lastName = ‘Smith’ AND firstName = ‘Sue’
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Delete a row in a table
DELETE FROM authors
WHERE authorID = 5
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Using JDBC
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The four basic steps involved with using JDBC to
connect to a database are:
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Load the appropriate JDBC driver
Request a connection to the database
Send SQL to the database
Process results, if appropriate
See
http://www.onjava.com/pub/a/onjava/synd/2001/08
/21/jdbc.html for more information.
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DisplayAuthors.java I
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Import package sql
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Identify driver class JdbcOdbcDriver
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import java.sql.*;
static final String JDBC_DRIVER =
"sun.jdbc.odbc.JdbcOdbcDriver";
Identify database file (books.mdb)
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static final String DATABASE_URL =
“jdbc:odbc:books”;
“jdbc:odbc:books” contains the communication
___________ (jdbc), subprotocol (odbc), and database
name (books)
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DisplayAuthors.java II
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Create a Connection object to connect the Java
program to the ___________
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private Connection connection =
DriverManager.getConnection( DATABASE_URL );
Set the location of the database with the property
name and value
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System.setProperty( “odbc.system.home”,
“C:/” );
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DisplayAuthors.java III
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Get the specified Class object (JdbcOdbcDriver)
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Create a Statement object for submitting _______
statements to the database
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Class.forName( JDBC_DRIVER );
private Statement statement =
connection.createStatement();
Execute an SQL statement and store results in a
ResultSet object.
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ResultSet resultSet =
statement.executeQuery(
“SELECT * FROM authors” );
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Setting Up ODBC Data Sources
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Open Microsoft Windows Control Panel.
Double-click the Administrative Tools icon.
Double-click on the Data Sources (ODBC) icon.
Select the User DSN tab.
To define a new data source for a currently
installed driver, click Add.
Complete the dialog boxes.
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Select Microsoft Access Driver, Finish
Enter a Data Source Name (such as “books”)
Click Select… and select the database, click OK
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