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POGet all data from DB using fetchall_hashref
 

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  1. POGet all data from DB using fetchall_hashref
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    <p>I am using fetchall_hashref to get data satisfying a condition from a mysql DB.The data retrieved will be stored in a hash and then be used futhur by a javascript function.</p> <p>I want to retrieve all the rows of 3 columns and store it in a hash but not being able to do that.</p> <p>The table structure..</p> <p><a href="https://i.stack.imgur.com/1QRn4.png" rel="nofollow noreferrer">table structure</a> <img src="https://i.stack.imgur.com/UeTFE.png" alt="table structure"></p> <p>the table data..</p> <p><a href="https://i.stack.imgur.com/Oba8f.png" rel="nofollow noreferrer">table data</a> <img src="https://i.stack.imgur.com/UeTFE.png" alt="table data"></p> <p>the code being used..</p> <pre><code>#!/usr/bin/perl -w #print "Content-type: text/html\n\n"; use DBI; use CGI; use strict; use warnings; use diagnostics; use Data::Dumper; use CGI::Carp qw (fatalsToBrowser); my $q = CGI-&gt;new; print $q-&gt;header; my $dsn = "DBI:mysql:Demo:localhost"; # Data source name my $username = "mint"; # User name my $password = "MINT123"; # Password my $dbh; my $sth; my $b; my $c; # Database and statement handles $dbh = DBI-&gt;connect($dsn, $username, $password); my $hash = $dbh-&gt;selectall_hashref("SELECT `desc`,date1,riskval from FIR2 where date1 between date_sub(now(),INTERVAL 1 WEEK) and now() order by date1", 'riskval'); print Dumper($hash); $b=join(",",$hash); delete $_-&gt;{riskval} for values %$hash; $dbh-&gt;disconnect(); </code></pre> <p>The output i am getting in browser...</p> <p><img src="https://i.stack.imgur.com/UeTFE.png" alt="browser output"></p> <p>the output in putty..</p> <p><img src="https://i.stack.imgur.com/Ff3pA.png" alt="enter image description here"></p> <p>As you can see I want to print the row where "riskval" is null,the value of "riskval" is 5 in 2 places but only 1 row is getting printed..</p> <p>after i replaced selectall_hashref with selectall_arrayref i got the following error message in putty..</p> <p><img src="https://i.stack.imgur.com/aK6kD.png" alt="second error message"></p> <p>Please help..</p>
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    1. USLucy
    1. USLucy
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    1. COhash can't have multiple identical keys so you'll have to change approach by using hash of arrays or something similar.
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      1. POGet all data from DB using fetchall_hashref
      1. USСухой27
    2. COcan you give an example???
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      1. USLucy
    3. COsure, http://perldoc.perl.org/perldsc.html#Declaration-of-a-HASH-OF-ARRAYS
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      1. POGet all data from DB using fetchall_hashref
      1. USСухой27
 

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