Download Use DB2

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 SQL
Using IBM DB2
 Techniques:

DB2, JDBC (Java Database Connectivity)
Project2
 Web-based
Online Access of Databases: online
access/update of a movie database
 Techniques:
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 hours
 The
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
 IBM
2002 on RDBMS market share (new licenses)
34.6% ORCL 32.0% MSFT: 16.3% SYBASE: 2.6%
 DB2
is cheap: at least 4 times cheaper than Oracle
 DB2
is the standard
 DB2
is free for education/research use
 DB2
is small and simple
Setup DB2 Environments

DB2 environments like path for db2 libraries,
executable files, DB2 Java CLASSPATH

csh/tcsh:
 source
 or

/u/cs/class/cs143v/cs143vta/sqllib/db2cshrc
put it into .cshrc to run automatically after login
bash:
 source
 or
/u/cs/class/cs143v/cs143vta/sqllib/db2profile
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
line
 From
applications: embedded SQL, JDBC, Stored
Procedures, etc.

Command line:
 DB2
shell: $db2; then input SQL commands dynamically
 Through
 SQL
OS command line: $db2 SQL command
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
commands
 enter
? for help, or ? cmdname for a specific command
 commonly
 connect
used: (no semicolon at the end please)
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
 If
locally: you can ignore userid/passed
 In

to sample1 [user userid] [using passwd]
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:
IMPORT FROM datafile OF DEL
RESTARTCOUNT 100
MESSAGES import.msg insert INTO employee;
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
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 SQL
Using IBM DB2
Due: Noon Tuesday, Nov 2

Tasks
 Define

and create tables
 Load
data into the tables
 Write
queries as SQL scripts
 Write
queries with JDBC
Start early!
JDBC

JDBC (Java Database Connectivity) API: a
standard SQL database access interface
 same API

for all databases
Environment (already setup if you set db2 env)
 Java
and javac
 db2java.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")
 Class.forName("COM.ibm.db2.jdbc.net.DB2Driver")

(on local)
(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
 For
rs = stmt.executeQuery("SELECT * from employee");
update/insert/delete/or DDL queries:
rs = stmt.executeUpdate(“delete from employee
where empno=‘1’ ");
 ResultSet
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.