SQL VISUAL QUICKSTART GUIDE- P5 pdf

Alternatively, if Control Center is open, choose Tools > Command Editor or click.. To start the db2command-line processor in Windows: ◆ At a command prompt, type db2cmdand then press Ent

IBM DB2

IBM DB2 is a commercial DBMS that sup-ports very large databases and numbers of transactions It runs on many operating sys-tems and hardware platforms and is com-plex enough to require a full-time database administrator (DBA) to run and maintain it Learn about DB2 products at

www.ibm.com/db2and download a free 90-day trial copy of DB2 or a (permanently) free copy of IBM DB2 Express-C

This book covers DB2 9.5 but also includes tips for earlier versions, back to 8.0 To deter-mine which version of DB2 you’re running, run the DB2 command-line command db2level

or run the query SELECT service_level FROM SYSIBMADM.ENV_INST_INFO;

To run SQL programs, use the Command

Center graphical tool in DB2 8.x, the

Command Editor graphical tool in DB2 9.x,

or the db2command-line processor (CLP)

To use Command Center (DB2 8. x):

1. Start Command Center

This procedure varies by platform

In Windows, for example, choose Start > All Programs > IBM DB2 > Command Line Tools > Command Center In Unix and Linux, use the command db2cctr Alternatively, if Control Center is open, choose Tools > Command Center or click

2. Choose the command-type SQL Statements and DB2 CLP Commands

3. Click the Interactive tab

4. In the Database Connection box, click , expand the object tree until you find the Databases folder, select a database, and then click OK

5. To run SQL interactively, in the Command box, type or paste an SQL

statement (Figure 1.27).

or

To run an SQL script, click the Scripts tab, choose Script > Import, navigate to and select the script file, and then click OK

6. Click or press Ctrl+Enter

or

Choose Interactive > Execute or Script > Execute

Interactive-SQL results appear in the

Results tab (Figure 1.28) SQL-script

Command Center.

To use Command Editor (DB2 9. x):

1. Start Command Editor

This procedure varies by platform

In Windows, for example, choose

Start > All Programs > IBM DB2 >

[db2_copy_name] > Command Line

Tools > Command Editor In Unix and

Linux, use the command db2ce

Alternatively, if Control Center is open,

choose Tools > Command Editor or

click

2. On the Commands tab, choose a

data-base in the Target list

If the desired database doesn’t appear in

the Target list, click Add (to the right of

the list), choose a database, and then

click OK

3. To run SQL interactively, type or paste an

SQL statement in the top box of the

Commands tab (Figure 1.29).

or

To run an SQL script, choose Selected >

Open (or press Ctrl+O), navigate to and

select the script file, and then click OK

4. Click or press Ctrl+Enter

or

Choose Selected > Execute

Command Editor displays the results in

the Query Results tab (Figure 1.30) The

bottom box of the Commands tab shows

query-processing information

Command Editor.

For technical reasons involving parent and

child processes, (only) Microsoft Windows

users must start the db2command-line

processor with a special preliminary step

To start the db2command-line

processor in Windows:

◆ At a command prompt, type db2cmdand then press Enter

or

For DB2 8.x, choose Start > All Programs >

IBM DB2 > Command Line Tools >

Command Window

or

For DB2 9.x, choose Start > All Programs > IBM DB2 > [db2_copy_name] >

Command Line Tools > Command

Window

A new DB2 CLP command-prompt win-dow appears

✔ Tips

■ You must use the DB2 CLP window for

alldb2commands (described next) If

you try to run db2at a regular Windows

command prompt, DB2 responds with

the error “Command line environment

not initialized.”

■ If you launch a new DB2 CLP window via the db2cmdcommand, you can close the

original command-prompt window

■ In the DB2 CLP window, change (cd)

your working directory if necessary

before you run db2commands

To use the db2command-line

processor interactively:

1. At a command prompt, type

db2 -t

and then press Enter The -toption

tells db2that a semicolon (;) terminates

statements

Thedb2 =>prompt appears

2. At the db2prompt, type

connect to dbname;

and then press Enter dbname is the

name of the database to use

3. Type an SQL statement The statement

can span multiple lines Terminate it

with a semicolon and then press Enter to

display the results (Figure 1.31).

✔ Tip

■ Alternatively, you can avoid the db2 =>

prompt by typing commands and SQL

statements right on the command line

For example:

db2 connect to books

db2 SELECT * FROM authors

If you omit the -toption, as here, don’t

terminate commands and SQL

state-ments with a semicolon

interactive mode.

To use the db2command-line processor in script mode:

1. At a command prompt, type:

db2 connect to dbname

dbname is the name of the database

to use

2. At a command prompt, type:

db2 -t -f sql_script

sql_script is a text file containing SQL

statement(s) and can include an absolute

or relative pathname The -toption tells db2that a semicolon (;) terminates statements

3. Press Enter to display the results

(Figure 1.32).

✔ Tips

■ In step 2, add the option -vif you want

to echo the contents of sql_script in the

output

■ An alternative script tool is db2batch

mode.

To exit the db2command-line tool:

◆ At the db2prompt, type quit;and then

press Enter (Omit the semicolon if

you didn’t use the -toption when you

started db2.)

To show db2command-line options:

◆ At a command prompt, type db2 ?and

then press Enter

This command displays a few pages that

speed by quickly To view one page at a

time, instead type db2 ? | moreand then

press Enter Tap the spacebar to advance

pages (Figure 1.33).

✔ Tips

■ To get help while you’re at a db2 =>

prompt, type ?;and then press Enter

(Omit the semicolon if you didn’t use

the -toption when you started db2.)

■ DB2 for Linux, Unix, and Windows

(“LUW” in IBM-speak) differs somewhat

from DB2 on other platforms This

sec-tion covers LUW DB2 If you’re running

non-LUW DB2 (on z/OS or OS/390, for

example), your commands might differ

MySQL (pronounced my-es-kyoo-el) is an

open-source DBMS that supports large data-bases and numbers of transactions MySQL

is known for its speed and ease of use It’s free for personal use and runs on many operating systems and hardware platforms

You can download it at www.mysql.com This book covers MySQL 5.1 but also includes tips for earlier versions, back to 4.0

To determine which version of MySQL you’re running, run the MySQL command-line command mysql -Vor run the query

SELECT VERSION();

To run SQL programs, use the mysql

command-line tool

✔ Tip

■ To open a command prompt in Windows, choose Start > All Programs > Accessories > Command Prompt

To use the mysqlcommand-line tool interactively:

1. At a command prompt, type:

mysql -h host -u user -p dbname

host is the host name, user is your MySQL user name, and dbname is the name of

the database to use MySQL will prompt you for your password (for a passwordless user, either omit the -poption or press Enter at the password prompt)

2. Type an SQL statement The statement

interactive mode.

To use the mysqlcommand-line tool

in script mode:

1. At a command prompt, type:

mysql -h host -u user -p -t

➞ dbname < sql_script

host is the host name, user is your

MySQL user name, and dbname is the

name of the database to use MySQL

will prompt you for your password (for

a passwordless user, either omit the -p

option or press Enter at the password

prompt) The -toption formats the

results as a table; omit this option if you

want tab-delimited output dbname is

the name of the database to use The <

redirection operator reads from the file

sql_script, which is a text file containing

SQL statement(s) and can include an

absolute or relative pathname

2. Press Enter to display the results

(Figure 1.35).

mode.

To exit the mysqlcommand-line tool:

◆ Type quitor\qand then press Enter

To show mysqlcommand-line options:

◆ At a command prompt, type mysql -?

and then press Enter

This command displays a few pages that speed by To view one page at a time, type mysql -? | moreand then press Enter Tap the spacebar to advance pages

(Figure 1.36).

✔ Tips

■ If MySQL is running on a remote net-work computer, ask your database administrator (DBA) for the connection parameters If you’re running MySQL locally (that is, on your own computer),

then set host tolocalhost, set user to

root, and use the password you assigned

torootwhen you set up MySQL

■ As an alternative to the command prompt, you can use the graphical tools

at www.mysql.com/products/tools

■ You can learn more about open-source software at www.opensource.org