Perl and MySQL

• Using apache server with perl cgi

• Using MySQL

• Need to install dbi and dbd modules to your perl installation.

• There are some good examples on this site: http://www.tutorialspoint.com/perl/perl_cgi.htm

Using perl with mysql• If you are using ActivePerl, you may use ppm to install DBD-mysql.

For Perl 5.6, upgrade to Build 623 or later, then it is sufficient to runC:\perl>ppm install DBI C:\perl>ppm install DBD::mysql • If you need an HTTP proxy, you might need to set the environment

variable http_proxy, for example like this:• set http_proxy=http://myproxy.com:8080/ • As of this writing, DBD::mysql is missing in the ActivePerl 5.8.0

repository. However, Randy Kobes has kindly donated an own distribution and the following might succeed:

• C:\>ppm install http://theoryx5.uwinnipeg.ca/ppms/DBD-mysql.ppd

Perl and db queries

• Using apache server with perl cgi

• Using MySQL

• Need to install dbi and dbd modules to your perl installation.

• See next slide screen shot for

C:\perl>ppm install dbi

C:\perl>ppm install DBI

Installing dbd:mysql (not in perl5.8)c;:\>ppm install

http://theoryx5.uwinnipeg.ca/ppms/DBD-mysql.ppd

Using perl with mysql• If you are using ActivePerl, you may use ppm to install DBD-mysql.

For Perl 5.6, upgrade to Build 623 or later, then it is sufficient to runC:\perl>ppm install DBI C:\perl>ppm install DBD::mysql • If you need an HTTP proxy, you might need to set the environment

variable http_proxy, for example like this:• set http_proxy=http://myproxy.com:8080/ • As of this writing, DBD::mysql is missing in the ActivePerl 5.8.0

repository. However, Randy Kobes has kindly donated an own distribution and the following might succeed:

• C:\>ppm install http://theoryx5.uwinnipeg.ca/ppms/DBD-mysql.ppd

You’ll need a table in some mysql database

Using mysql

• You’ll need a network connection for this install

• Create a command prompt in perl/bin and run the ppm (program package manager)

• Type – Install DBI

Using mysql: DOS window –lots of stuff installed

C:\PERL\BIN>ppmPPM - Programmer's Package Manager version 3.2.Copyright (c) 2001 ActiveState Corp. All Rights Reserved.ActiveState is a division of Sophos.Entering interactive shell. Using Term::ReadLine::Perl as readline library.Type 'help' to get started.ppm> install DBI====================Install 'DBI' version 1.50 in ActivePerl 5.8.7.813.====================Downloaded 558143 bytes.Extracting 73/73: blib/arch/auto/DBI/Driver_xst.hInstalling C:\Perl\site\lib\auto\DBI\dbd_xsh.hInstalling C:\Perl\site\lib\auto\DBI\DBI.bsInstalling C:\Perl\site\lib\auto\DBI\DBI.dllInstalling C:\Perl\site\lib\auto\DBI\DBI.expInstalling C:\Perl\site\lib\auto\DBI\dbi_sql.hInstalling C:\Perl\site\lib\auto\DBI\Driver.xstInstalling C:\Perl\site\lib\auto\DBI\Driver_xst.hInstalling C:\Perl\site\lib\DBI\ProfileDumper\Apache.pmInstalling C:\Perl\site\lib\DBI\SQL\Nano.pmInstalling C:\Perl\site\lib\Win32\DBIODBC.pmInstalling C:\Perl\bin\dbiprofInstalling C:\Perl\bin\dbiprof.batInstalling C:\Perl\bin\dbiproxyInstalling C:\Perl\bin\dbiproxy.batSuccessfully installed DBI version 1.50 in ActivePerl 5.8.7.813.ppm> exit

C:\PERL\BIN>

Install mysql connector from ppmppm> install http://theoryx5.uwinnipeg.ca/ppms/DBD-mysql.ppd====================Install 'DBD-mysql' version 3.0002 in ActivePerl 5.8.7.813.====================Downloaded 637299 bytes.Extracting 43/43: blibInstalling C:\Perl\site\lib\auto\DBD\mysql\mysql.bsInstalling C:\Perl\site\lib\auto\DBD\mysql\mysql.dllInstalling C:\Perl\site\lib\auto\DBD\mysql\mysql.expInstalling C:\Perl\site\lib\auto\DBD\mysql\mysql.libInstalling C:\Perl\html\site\lib\Mysql.htmlInstalling C:\Perl\html\site\lib\Bundle\DBD\mysql.htmlInstalling C:\Perl\html\site\lib\DBD\mysql.htmlInstalling C:\Perl\html\site\lib\DBD\mysql\INSTALL.htmlFiles found in blib\arch: installing files in blib\lib into architecture dependent library treeInstalling C:\Perl\site\lib\Mysql.pmInstalling C:\Perl\site\lib\Bundle\DBD\mysql.pmInstalling C:\Perl\site\lib\DBD\mysql.pmInstalling C:\Perl\site\lib\DBD\mysql\GetInfo.pmInstalling C:\Perl\site\lib\DBD\mysql\INSTALL.podInstalling C:\Perl\site\lib\Mysql\Statement.pmSuccessfully installed DBD-mysql version 3.0002 in ActivePerl 5.8.7.813.ppm>

Listing dbi drivers perlscript (save in perl/bin)

use strict;

use warnings;

use DBI;

print map "$_\n",

DBI->available_drivers;

Listing dbi drivers

C:\PERL\BIN>perl dbidrivers.plDBMExamplePFileProxySpongemysql

C:\PERL\BIN>

Mysqltest.pl

• running perlscript on the commandline with db connection

• Need an accounts table in mysql containing fields: idnum, name and balance

The script: Mysqltest.pl

use DBI;my $dsn = "DBI:mysql:database=test;host=localhost";my $dbh = DBI->connect($dsn, 'root', '',

{RaiseError => 1}) ||die $DBI::errstr;my $sth = $dbh->prepare(qq{ SELECT idnum,name, balance FROM

accounts });

$sth->execute || die "Error fetching data: $DBI::errstr";

while (my ($idnum,$name, $balance) = $sth->fetchrow_array) { print qq{ $name has balance: $balance \n};}

$dbh->disconnect;

Running mysqltest.pl

C:\PERL\BIN>perl mysqltest.pl bob smith has balance: 1234567.99 sue jones has balance: 11223344.77 allison douglas has balance: 23456.64 wilson pickett has balance: 123.45 Venus Williams has balance: 98776587.11 R2D2 has balance: 12.88 Burt Lancaster has balance: 654832.11 Katie has balance: 389 Pop-Eye has balance: 34.16

C:\PERL\BIN>

You’ll need a table in some mysql database

Perlscript: part1#!C:\perl\bin\perl.exeprint "Content-type: text/html \n\n";# PERL MODULES WE WILL BE USINGuse DBI;use DBD::mysql

# HTTP HEADER

print "starting...";

$dbh= DBI->connect("DBI:mysql:test;mysql_use_result=1", "root", "");

print "connected...";# PREPARE THE QUERYmy $sth = $dbh->prepare("SELECT * FROM students");

execute query…display results

# EXECUTE THE QUERY

print "executed query..."; if (!$sth) { die "Error:" . $dbh->errstr . "\n"; } if (!$sth->execute) { die "Error:" . $sth->errstr . "\n"; } my $names = $sth->{'NAME'}; my $numFields = $sth->{'NUM_OF_FIELDS'}; for (my $i = 0; $i < $numFields; $i++) { printf("%s%s", $i ? "," : "", $$names[$i]); } print "\n"; while (my $ref = $sth->fetchrow_arrayref) { for (my $i = 0; $i < $numFields; $i++) { printf("%s%s", $i ? "," : "", $$ref[$i]); } print "\n"; }

http://localhost/cgi-bin/dbex6.cgi

Inserting a record#!C:\perl\bin\perl.exeprint "Content-type: text/html \n\n";# PERL MODULES WE WILL BE USINGuse DBI;use DBD::mysql# HTTP HEADERprint "starting...";$dbh= DBI->connect("DBI:mysql:test;mysql_use_result=1", "root", "");print "connected...";# PREPARE THE QUERY$query = "INSERT INTO students ( name,id, grade) VALUES ( 'tomatoes', '11111','4')";my $sth = $dbh->prepare($query);# EXECUTE THE QUERY if (!$sth) { die "Error:" . $dbh->errstr . "\n"; } if (!$sth->execute) { die "Error:" . $sth->errstr . "\n"; } print "executed query...";

Updating records#!C:\perl\bin\perl.exeprint "Content-type: text/html \n\n";# PERL MODULES WE WILL BE USINGuse DBI;use DBD::mysql# HTTP HEADERprint "starting...";$user = “user";$pw = "pw";print "defined vars...";# DATA SOURCE NAME$dsn = "DBI:mysql:test:localhost:3306";# PERL DBI CONNECT$dbh= DBI->connect("DBI:mysql:test;mysql_use_result=1", $user,$pw)|| die "Database connection not made: $DBI::errstr";print "connected...";$dbh->{RaiseError} = 1; my $sth = $dbh->prepare("UPDATE students SET id = '1212' WHERE name = 'john'"); print "defined sth...";$sth->execute(); print "executed..";$sth->finish; $dbh->disconnect; exit; __END__

Updating records

Updating multiple records

Updating multiple records$dbh= DBI->connect("DBI:mysql:test;mysql_use_result=1", $user,

$pw)|| die "Database connection not made: $DBI::errstr";print "connected...";my @names = ("john", "Katie", "tomatoes"); $dbh->{RaiseError} = 1; my $sth = $dbh->prepare("UPDATE students SET grade= '99.9' WHERE name = ?"); print "defined sth..."; foreach $value (@names){

$sth->execute($value);}

print "executed..";$sth->finish; $dbh->disconnect;

Using Bind Values

There may be a case when values to be entered into the table are not given in advance. In such a case, binding values are used. A question mark is used in place of actual value and then actual values are passed through the execute() API.

Example: bind and execute using form parameters

my($name, $street, $city) =

(param("name"), param("street"),

param("city"));#params from a form

my $sth = $dbh->prepare("INSERT INTO TEST_TABLE (NAME, STREET, CITY) values (?,?,?)");

$sth->execute($name,$street,$city) or die $DBI::errstr;

$sth->finish();

$dbh->commit or die $DBI::errstr;

bind and execute for an arbitrary query

$age = param(‘age’);#or read from a file or from input my $sth = $dbh->prepare("SELECT FIRST_NAME,

LAST_NAME FROM TEST_TABLE WHERE AGE > ?"); $sth->execute( $age ) or die $DBI::errstr; print "Number of rows found :" + $sth->rows; while (my @row = $sth->fetchrow_array()) { my ($first_name, $last_name ) = @row; print "First Name = $first_name, Last Name = $last_name\

n"; } $sth->finish();

An html to perform sql

Perl performs query