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Top Forums Shell Programming and Scripting perl DBI: populate a scalar from a select statement Post 302372293 by hcclnoodles on Tuesday 17th of November 2009 03:17:27 PM
Old 11-17-2009
perl DBI: populate a scalar from a select statement

hi

every resource i see regarding DBI refers to retrieving data from a database into and array or a hash, but i havent seen anything on how to pull out a single value to a scalar

in my database i have a field called "forcewrite" with a value of "6". I am trying to connect to the database, pull this value straight out to a scalar variable, so i can evaluate it later... is there a way to do this ..?

I tried this but this just returns a value of "1" everytime i run it (im assuming it must be an error code or something because im not sure where its getting the "1" from)


Code:
#!/usr/bin/perl -w
use DBI;
my $primac = "6666.5555.4444";
my $dbh = DBI->connect("DBI:mysql:myDB","username","password",) or die $DBI::errstr;
my $force = $dbh->do("SELECT forcewrite FROM table WHERE primac = '$primac'") or die $DBI::errstr;
print "$force\n";

Is there a way to pull a value from a DB straight into a scalar ?

---------- Post updated at 08:17 PM ---------- Previous update was at 08:06 PM ----------

ive managed to get it working this way ...just would be nice if i could go straight to a scalar as opposed to the first element of an array... oh well

Code:
#!/usr/bin/perl -w
use DBI;
my $primac = "6666.5555.4444";
my $dbh = DBI->connect("DBI:mysql:myDB","username","password",) or die $DBI::errstr;
my $sth = $dbh->prepare("SELECT forcewrite FROM admin WHERE primac = '$primac'") or die $DBI::errstr;
$sth->execute() or die  $DBI::errstr;
my $force = ($sth->fetchrow_array())[0];
print "$force\n";

 

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Authen::Simple::DBI(3pm)				User Contributed Perl Documentation				  Authen::Simple::DBI(3pm)

NAME
Authen::Simple::DBI - Simple DBI authentication SYNOPSIS
use Authen::Simple::DBI; my $dbi = Authen::Simple::DBI->new( dsn => 'dbi:SQLite:dbname=database.db', statement => 'SELECT password FROM users WHERE username = ?' ); if ( $dbi->authenticate( $username, $password ) ) { # successfull authentication } # or as a mod_perl Authen handler PerlModule Apache::DBI PerlModule Authen::Simple::Apache PerlModule Authen::Simple::DBI PerlSetVar AuthenSimpleDBI_dsn "dbi:SQLite:dbname=database.db" PerlSetVar AuthenSimpleDBI_statement "SELECT password FROM users WHERE username = ?" <Location /protected> PerlAuthenHandler Authen::Simple::DBI AuthType Basic AuthName "Protected Area" Require valid-user </Location> DESCRIPTION
DBI authentication. METHODS
* new This method takes a hash of parameters. The following options are valid: * dsn Database Source Name. Required. dsn => 'dbi:SQLite:dbname=database.db' dsn => 'dbi:mysql:database=database;host=localhost;' * statement SQL statement. The statement must take a single string argument (username) and return a single value (password). Required. statement => 'SELECT password FROM users WHERE username = ?' * username Database username. username => 'username' * password Database password. password => 'secret' * log Any object that supports "debug", "info", "error" and "warn". log => Log::Log4perl->get_logger('Authen::Simple::DBI') * authenticate( $username, $password ) Returns true on success and false on failure. SEE ALSO
Authen::Simple. Authen::Simple::Password. DBI. AUTHOR
Christian Hansen "ch@ngmedia.com" COPYRIGHT
This program is free software, you can redistribute it and/or modify it under the same terms as Perl itself. perl v5.8.8 2008-02-29 Authen::Simple::DBI(3pm)
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