Hello Monks!

I am running sql queries on a spreadsheet. Some of the cells have no value in them. For example, some patients have no record of their viral DNA level at treatment week 12 (column dnatw12). When I try to skip these blank fields using 'IS NOT NULL' I get an error message {DBD::CSV::st execute failed: Can't locate object method "do_err" via package "SQL::Statement::Function::NumericEval"}

My Perl code for the sql search is below

#!/usr/bin/perl

use strict;
use warnings;
use Text::CSV;
use DBI;

sub RunSqlSearch;


my $spreadsheet = 'newCsv.csv'; 
my $query = qq(SELECT sid,genotype, dnabl, dnatw12 FROM $spreadsheet W
+HERE genotype = 'a' AND (dnatw12/dnabl)<0.5 AND dnatw12 IS NOT NULL )
+;   
my ($queryResult) = RunSqlSearch($query);
print "Your query $query returned the following result:\n$queryResult\
+n";

sub RunSqlSearch($){
    
    my $query = $_[0]; 
    
    # error check #
    if ($query eq ""){die "From runSqlQuery2 -  No value entered for $
+query $!\n";}
        
     # Connect to the database, (the directory containing our csv file
+(s))
    my $dbh = DBI->connect ("dbi:CSV:", undef, undef, {
          f_dir                       => ".",
#          f_ext                       => ".csv/r",
          f_encoding                  => "utf-8",
          csv_eol                    => "\n",
          RaiseError                => 1,
          }) or die $DBI::errstr;
    
    # Output using sql query #
    my $sth = $dbh->prepare($query);
    if($sth){
        $sth ->finish();
    }
    $sth->execute;
    
    my @row;
    my $queryResult="";
    my @queryResult;
    while (@row = $sth->fetchrow_array) {
        push @queryResult, @row;
        $queryResult .= join("\t",@row) . "\n";
    }  
        
    # output arguments #
    if ($queryResult eq ""){$queryResult = "No result found";}
    return ($queryResult);
    
    $sth->finish();
    $dbh->disconnect(); 
}
[download]

My full error message is below

DBD::CSV::st execute failed: Can't locate object method "do_err" via p
+ackage "SQL::Statement::Function::NumericEval" at C:/Strawberry/perl/
+vendor/lib/SQL/Statement/Function.pm line 216, <GEN1> line 37.
 [for Statement "SELECT sid,genotype, dnabl, dnatw8 FROM newCsv.csv WH
+ERE genotype = 'a' AND (dnatw12/dnabl)<0.5 AND dnatw12 IS NOT NULL "]
+ at C:/Users/Sandy/Documents/PC_Bioinformatics_MSc/Project/Perl/runSQ
+LQuery2.pl line 38, <GEN1> line 37.
DBD::CSV::st execute failed: Can't locate object method "do_err" via p
+ackage "SQL::Statement::Function::NumericEval" at C:/Strawberry/perl/
+vendor/lib/SQL/Statement/Function.pm line 216, <GEN1> line 37.
 [for Statement "SELECT sid,genotype, dnabl, dnatw8 FROM newCsv.csv WH
+ERE genotype = 'a' AND (dnatw12/dnabl)<0.5 AND dnatw12 IS NOT NULL "]
+ at C:/Users/Sandy/Documents/PC_Bioinformatics_MSc/Project/Perl/runSQ
+LQuery2.pl line 38, <GEN1> line 37.
[download]

When I run a query using columns that do not contain blanks - details for treatment week 8 are complete for all patients e.g. qq(SELECT sid,genotype, dnabl, dnatw8 FROM $spreadsheet WHERE genotype = 'a' AND (dnatw8/dnabl)<0.5 AND dnatw8 IS NOT NULL ); The query works perfectly.

I would be very grateful for any advice from the Monastery

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