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Very basics on DB access

Elke A. Rundensteiner

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DBMS?

Oracle Accounts already created Documentation: http://www.oracle.com

mySQL: To create an account, visit http://www.wpi.edu/Academics/CCC

Documentation: http://www.mysql.com Many other DBMS engines out there

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Oracle Version at WPI

The oracle server SID is WPI11GR2 (or, CS) Version: 11g 11.2.0.3.0 (64 bit version) System name is oracle.wpi.edu port is #1521

Problems: user names cannot have a “.” in them.

How to set up path for Oracle

If you use CCC linux systems, then you need to source /usr/local/bin/csoraenv file to setup your shell to use oracle

On CCC, if your shell is set to /bin/tcsh, then run :

source /usr/local/bin/csoraenv On CCC, if your shell is set to /bin/bash, then run : source /usr/local/bin/oraenv To figure out what the type of shell that you use, type:

echo $SHELL From your shell prompt, type : echo $PATH

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How to set up Oracle Or, set environment variables by adding the needed

settings into your .cshrc file on the ccc.wpi.edu machine (which gets sourced automatically when you log on).

setenv ORACLE_BASE /usr/local/oracle11gr203setenv ORACLE_HOME /usr/local/oracle11gr203/product/11.2.0/db_1

setenv PATH ${PATH}:${ORACLE_HOME}/binsetenv ORACLE_SID WPI11GR2 setenv TWO_TASK ${ORACLE_SID}

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How to set up Oracle Or, set environment variables by adding the needed

settings into your .cshrc file on the ccc.wpi.edu machine (which gets sourced automatically when you log on).

setenv ORACLE_BASE /usr/local/oracle11gr203setenv ORACLE_HOME /usr/local/oracle11gr203/product/11.2.0/db_1

setenv PATH ${PATH}:${ORACLE_HOME}/binsetenv ORACLE_SID WPI11GR2 setenv TWO_TASK ${ORACLE_SID}

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How to set up Oracle

If in tcsh or csh shell, your .cshrc file would be:

setenv ORACLE_BASE /usr/local/oracle11gr203setenv ORACLE_HOME ${ORACLE_BASE}/product/11.2.0/db_1setenv PATH ${PATH}:${ORACLE_HOME}/binsetenv ORACLE_SID WPI11GR2 setenv TWO_TASK WPI11GR2setenv LD_LIBRARY_PATH ${ORACLE_HOME}/lib

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How to set up Oracle

If in bash shell, your .cshrc file would be:

setenv ORACLE_BASE=/usr/local/oracle11gr203setenv ORACLE_HOME=${ORACLE_BASE}/product/11.2.0/db_1setenv PATH=${PATH}:${ORACLE_HOME}/binsetenv ORACLE_SID=WPI11GR2 setenv TWO_TASK=WPI11GR2setenv LD_LIBRARY_PATH=${ORACLE_HOME}/lib

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How to set up Oracle (contd…)

If your path is empty, then add one additional line, as below, on top of your .cshrc file :

setenv PATH .

The rest is as on previous slide

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How to set up Oracle

After editing the file “.cshrc “Please run below: or log out and

back in:

source .cshrc

Or, log out and back in.

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Problems while setting up Oracle

Important – Set up Oracle immediately and see that it is working

you may run into problems, typically due to simple typos or minor setup issues

If you have identified a project partner, start working with him/her on this to help each other

If you get really stuck, please send a message to mywpi to show a screen-dump of what happens.

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Oracle introduction

Connecting sqlplus <userName>/<PASSWORD>

Change passwd using password command You will end up submitting your passwd; therefore don’t use password that you use for other

purposes.

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Oracle useful commands

These commands can be executed from SQL shell

SELECT * FROM cat; -- lists tables you have createdSELECT table_name FROM user_tables; -- as above.

DESCRIBE <tableName>; -- describes schema for table with name tableName

help index; -- shows list of help topics;help start; -- illustrates how to use command start

exit; -- exit from SQL shell

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Using Oracle from Windows

Multiple ways: Use aquastudio software from aquafold.com. connect

to --server: oracle.wpi.edu

port: 1521 (this is the default)SID: WPI11GR2

Download oracle client for windows. Connect using sqlplus client or other tools:sqlplus rundenst/rundenst@//oracle.wpi.edu:1521/cs.wpi.edu

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Working with the Data Server

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Basic SQL Commands

CREATE TABLE student(sNum INTEGER,sName VARCHAR (30)); -- creates table student with two columns

INSERT INTO student VALUES (1, ‘Joe’); -- insert one row into the student table

SELECT * FROM student; -- select all rows from student table

DELETE FROM student; -- delete all rows in the student table

DROP TABLE student; -- drop student table

Purge recyclebin; -- purge recyclebin tables that get created.

-- Only works if you are logged onto CCC1

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Saving your Interactive Session in SQLPlus

If you want to save your output to a file (for homework)

spool <fileName>

<executeCmds to create tables ...>

spool off;