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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 SQL Using IBM DB2 Techniques: DB2, JDBC (Java Database Connectivity) Project2

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project overview

PROJECT OVERVIEW

Hyun J. Moon and Carlo Zaniolo

University of California, Los Angeles

CS143, Fall 2004

projects
Projects
  • Two Projects
  • Project1
    • Defining and Querying Databases in SQLUsing 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
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
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
project dbms ibm db2
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 Oracle
    • DB2 is the standard
    • DB2 is free for education/research use
    • DB2 is small and simple
setup db2 environments
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/db2profile
    • or put it into .bashrc to run automatically after login
test db2
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
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 OS command line: $db2 SQL command
    • SQL script files: put SQL scripts in a script file, and run as:
      • $db2 –tf <filename>
use db2 db2 command line
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 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
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
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
  • 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 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
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
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 DEL

RESTARTCOUNT 100

MESSAGES import.msg insert INTO employee;

db2 setup
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
Project 1

Defining and Querying Databases in SQLUsing IBM DB2Due: 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!
slide18
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
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
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
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/
academic honesty policy
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.