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Perl -connecting to DB taking query input from user

by MVRS (Acolyte)
on Mar 06, 2013 at 01:28 UTC ( #1021923=perlquestion: print w/replies, xml ) Need Help??
MVRS has asked for the wisdom of the Perl Monks concerning the following question:

my code unable take the input from the User input $Strain my out put is nareshmvr@ubuntu:~/Desktop/db/sampledb$ perl Please Enter the Strain Name : M18 ssnareshmvr@ubuntu:~/Desktop/db/sampledb$

#!/usr/bin/perl -w #use Strict; use DBI; print "Please Enter the Strain Name : \n"; my $Strain = <>; $dbh = DBI->connect('dbi:mysql:sampledb','root','******') or die "Connection Error: $DBI::errstr\n"; $sql = "SELECT feature.fastaId,feature.contigId,feature.orfId,strain. +strainName,sequence.ntseq,sequence.aaseq from feature left join strai +n on left join sequence on +d where strainName ='$Strain';"; print "ss"; $sth = $dbh->prepare($sql); $sth->execute or die "SQL Error: $DBI::errstr\n"; while (@row = $sth->fetchrow_array) { print "@row\n"; }

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Re: Perl -connecting to DB taking query input from user
by graff (Chancellor) on Mar 06, 2013 at 02:22 UTC
    If you really want to prompt for input from the user after the program starts, then the advice in the first reply will take care of the immediate problem. But I would recommend using a command-line argument, which your script sees as $ARGV[0] (you run your script via a command-line shell, don't you?)

    Apart from that, you'll be better off using a placeholder in the sql query string, and passing the value to search for as a parameter when you execute the query:

    #!/usr/bin/perl use strict; # don't comment this out, and don't capitalize it. use DBI; my $Strain; if ( @ARGV ) { $Strain = shift; # get your target string from the command line } else { print "Please Enter the Strain Name: "; $Strain = <>; chomp $Strain; } $dbh = DBI->connect('dbi:mysql:sampledb','root','******') or die "Connection Error: $DBI::errstr\n"; $sql = <<EOS; # let's make it easier to read while we're at it SELECT feature.fastaId, feature.contigId, feature.orfId, strain.strainName, sequence.ntseq, sequence.aaseq from feature left join strain on left join sequence on where strainName = ? EOS $sth = $dbh->prepare($sql); $sth->execute( $Strain ) or die "SQL Error: $DBI::errstr\n"; while (@row = $sth->fetchrow_array) { print "@row\n"; }

      thank you graff its working fine

Re: Perl -connecting to DB taking query input from user
by kielstirling (Scribe) on Mar 06, 2013 at 01:51 UTC
    I don't understand?? But have noticed that you are passing $Strain with a \n on it. Try
    chomp(my $Strain = <>);
    see perldoc -f chomp
      Insted of giving Where strainName = 'xxxxx'in the query , i want to give it as the user input

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