1. Perl Database – Just Enough
Pepper

2. Overview Use the DBI package Define all connection info Connect to DB
use DBI;
Define all connection info
Connect to DB
Prepare an sql statement text
Execute the statement
Your preparation variable will hold the result
Fetch the result one row at a time

3. Connect Info needed to connect
What connection type (dbi driver): mysql
Dbi – database interface
What database name: (dbi_dsn): your db
What user : (dbi_user): your user
What password: (dbi_password): your password
Set into environment variables or on connect command

4. Setting Env Variables for DBI
$ENV{"DBI_DRIVER"} = "mysql";
$ENV{"DBI_DSN"} = "pepperdb";
$ENV{"DBI_USER"} = "your user";
$ENV{"DBI_PASS"} = "your password";

5. Make the connection $dbh=DBI->connect() or
die "Error opening database: $DBI::errstr\n";
$dbh is your connection variable now.
Ask $dbh for anything you want from the database
$DBI::errstr holds last error message
$dbh can be whatever name you want

6. Prepare SQL Statement
$sth=$dbh->prepare("SELECT * from tutorials_tbl;")
or die "Prepare failed: $DBI::errstr\n";
Create a statement object
It needs an sql statement string
Build it in a string or right in the prepare command argument
$sth holds what you plan to execute now
It knows it is working with $dbh

7. Execute your SQL statement
$sth->execute() or
die "Couldn't execute query: $DBI::errstr\n";
$sth now holds all the rows your query returned
Same thing you would see when you ran the query on mysql

8. Fetch your results $sth holds the resulting rows, but you want them.
Ask $sth to send back an array of the columns of one row at a time:
$sth ->fetchrow_array
Put the fetched array into variables, as many as you expect (one per column)
( $id, $name) = $sth ->fetchrow_array

9. Repeat for all rows Surround with while:
while (( $id, $name) = $sth ->fetchrow_array) {
print "$name has ID $id\n"; }

10. Clean-up Close the statement object Disconnect from the database
$sth->finish();
Disconnect from the database
$dbh->disconnect || die "Failed to disconnect\n";

11. Database summary Use the DBI package Define all connection info
Connect to DB
Prepare an sql statement text
Execute the prepared statement
Your preparation variable will hold the result
Fetch the result one row at a time

12. Web + Database
Create a perl script that uses a preset search word input form
Insert your code inside the yourpage method
Fill in your env variables for db connection
Connect, Prepare a statement, Execute Query
Fetch and Display your results
Place script in public_html
Set permissions (chmod o+rx your script.pl)
Run as dir>/<yourscript>