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PROJECT OVERVIEW

Hyun J. Moon and Carlo Zaniolo

University of California, Los Angeles

CS143, Fall 2004

Projects

Two Projects Project1

Defining and Querying Databases in SQLUsing IBM DB2

Techniques: DB2, JDBC (Java Database Connectivity)

Project2Web-based Online Access of Databases: online

access/update of a movie databaseTechniques: DB2, JDBC, HTML, Java Servlet

Hot topics! Good for job hunting! Start early, really early!

Project SEASNET Account

Each student is assigned a seas account for the project (not your personal seas account)Pick it up in the break of discussion or office hoursThe login/passwd will be explicitly used in your project

Change your passwd to anything except your private passwd Change your home directory permissions:chmod go-rxw dir

Project SEASNET Account (cont’d)

3 machines to login landfair.seas.ucla.edu lindbrook.seas.ucla.edu westholme.seas.ucla.edu

To decide which machine you need to login: LAST_2_DIGITS_OF_YOUR_STUDENT_ID mode 3

mod value Machine name Database name

0 landfair studbl

1 lindbrook studbn

2 westholme studbw

Project DBMS: IBM DB2

IBM DB2 (also Universal Database Server) Why DB2

Garner 2002 on RDBMS market share (new licenses) IBM 34.6% ORCL 32.0% MSFT: 16.3% SYBASE: 2.6%

DB2 is cheap: at least 4 times cheaper than OracleDB2 is the standardDB2 is free for education/research useDB2 is small and simple

Setup DB2 Environments

DB2 environments like path for db2 libraries, executable files, DB2 Java CLASSPATH

csh/tcsh:source /u/cs/class/cs143v/cs143vta/sqllib/db2cshrc or put it into .cshrc to run automatically after login

bash:source /u/cs/class/cs143v/cs143vta/sqllib/db2profileor put it into .bashrc to run automatically after login

Test DB2

Set your db2 environments first connect to a database:

$ db2 connect to sample1 user yourlogin type your passwd$ db2 “select * from cs143vta.staff”Other sample tables:

album, cl_sched, department, emp_act, emp_photo, emp_resume, employee, in_tray, org, project, sales, staff

Get help on DB2:http://www.seas.ucla.edu/db2/

Use DB2

Many ways:command lineFrom applications: embedded SQL, JDBC, Stored

Procedures, etc.

Command line:DB2 shell: $db2; then input SQL commands dynamicallyThrough OS command line: $db2 SQL commandSQL script files: put SQL scripts in a script file, and run as:

$db2 –tf <filename>

Use DB2: DB2 Command Line

DB2 command line: enter $db2 <enter>You can enter SQL commands + DB2 system

commandsenter ? for help, or ? cmdname for a specific commandcommonly used: (no semicolon at the end please)

connect to dbname (connect to database dbname) list tables (list tables of your schema) list database directory (list all database directory) connect reset (drop your connection to the database) terminate (terminate current session and exit db2 interactive

mode. Always leave your session this way!) echo abc (make comments to your codes)

Use DB2 (cont’d)

Similar as db2 command line except beginning with “db2” $db2 connect to dbname $db2 “select * from cs143vta.staff” (SQL needs to be quoted on UNIX)

SQL script file put SQL scripts to a file query.sql seperated by semicolons:

connect to studbn user xxx using yyy; echo test sql script; create table emp(empno int, name varchar(32) ); insert into emp values(10, ‘Joe Doe’); select * from emp; connect reset terminate;

Run as: $db2 –tf query.sql

Connect to DB2

DB2 has 1 or more instances: cs143vta Each instance can have databases

3 project databases: studbl, studbn, studbw

To access a database, the user must have the privilege to connect to that database

For DB2, a user to a database must also be a user to the OS

Connect to a database named sample1: connect to sample1 [user userid] [using passwd] If locally: you can ignore userid/passed In our project, you will connect remotely

Always run “terminate” after you finish

Schema

Schema: a named collection of objects such as tables. Such objects have to be unique inside the schema

When you create an object (e.g., a table), a default schema name is automatically created

e.g., create table test(a int); a schema named your login, e.g., cs143vxy is automatically created.

You can refer to the table as cs143vxy.test, or test (schema cs143vxy, your loginname is implied)

A Sample Table

A sample employee relation: employee(id, firstname, lastname, gender, hiredate, deptno, title,

salary)

connect to studbn user xxx passwd yyy;drop table employee;create table employee (id char(8), firstname varchar(24),lastname varchar(24),sex char(1),hiredate date,deptno char(8),title varchar(24) not null,salary integer);insert into employee values(‘10001’, ‘Joe’, ‘Doe’, ‘F’, ’10/02/2003’, ‘d01’, ‘Engineer’, ‘50000’);

Run as: $db2 –tf query.sql

DB2 Built-in Data Types

Date/Time: Date(10/02/2003), Time(17:12:25), Timestamp(2003-10-02-

17.12.32.963078)

String: char (fixed length), varchar(variable length), clob( character

LOB), blob(binary LOB). e.g., char(4): n <254. varchar(32): n<4000 clob(2M)

Numeric: REAL, DOUBLE SMALLINT(16bits), INTEGER(32bits), BIGINT(64bits),

DECIMAL. e.g., DECIMAL(5,2): 5: scale, 2 is the # of digits after the decimal point

Maximum length in a row: 4005 for 4KBytes pages

Load Data

Import example:

Normally data files can be: ASC (non-delimited ASCII format) DEL (delimited ASCII format, default delimiter: ,) IXF (integrated exchange format)

Refresh data: I. drop tables + create tables + load data II. delete from emp + load data

IMPORT FROM datafile OF DELRESTARTCOUNT 100MESSAGES import.msg insert INTO employee;

DB2 Setup

You can work on your project on your own DB2 and copy it over to seas account, but make sure it works!

DB2 download: http://www.ibm.com/db2, download

For windows, when you setup, you need to create an administration account, e.g., db2admin

To start up db2, run with an Administrator account: c:>db2cmd (setup db2 environment) c:>db2start (start up db2 instance) c:>db2jstrt (start up java connection) c:>db2admin start (startup admin server so you can run DB2 control

center) c:>db2cc (Control Center, a GUI for administration) c:>db2stop (stop db2) c:>db2admin stop (stop db2 admin server)

Project 1

Defining and Querying Databases in SQLUsing IBM DB2

Due: Noon Tuesday, Nov 2 Tasks

Define and create tablesLoad data into the tablesWrite queries as SQL scriptsWrite queries with JDBC

Start early!

JDBC

JDBC (Java Database Connectivity) API: a standard SQL database access interfacesame API for all databases

Environment (already setup if you set db2 env)Java and javacdb2java.zip (jdbc lib)

Sample files: /w/class.01/cs/cs143v/cs143vta/sample-code

Establishing a Connection

Load the vendor specific driver: Class.forName("COM.ibm.db2.jdbc.app.DB2Driver") (on local) Class.forName("COM.ibm.db2.jdbc.net.DB2Driver") (remote)

Make the connection connection url: e.g., jdbc:db2://national.seas.ucla.edu/studbn username, passwd Connection con = DriverManager.getConnection(url, userid, passwd);

Creating JDBC Statements and Send Queries

A JDBC Statement object is used to send your SQL statements to the DBMS Statement stmt = con.createStatement();

Execute the query:For select queries:

ResultSet rs = stmt.executeQuery("SELECT * from employee");

For update/insert/delete/or DDL queries: ResultSet rs = stmt.executeUpdate(“delete from employee

where empno=‘1’ ");

Accessing ResultSet

rs.next() returns false when there are no more rows

while (rs.next()) { String a = rs.getString(1); String str = rs.getString(2); }

Help: http://java.sun.com/j2se/1.4.2/docs/api/

accessDatabase.java

Academic Honesty Policy

You are expected to submit your own original work It is encouraged to discuss the project with peer

students, provided that you indicate their names in your submission.

All code must be written up independently. Any suspected academic dishonesty will be

reported to the Dean of Students for disciplinary action, which may result in suspension or dismissal from the University.