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POHow can I get column names and row data in order with DBI in Perl?
 

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  1. POHow can I get column names and row data in order with DBI in Perl?
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    <p>I'm using DBI to query a SQLite3 database. What I have works, but it doesn't return the columns in order. Example:</p> <pre><code>Query: select col1, col2, col3, col4 from some_view; Output: col3, col2, col1, col4 3, 2, 1, 4 3, 2, 1, 4 3, 2, 1, 4 3, 2, 1, 4 ... (values and columns are just for illustration) </code></pre> <p><strong>I know this is happening because I'm using a hash</strong>, but how else do I get the column names back if I only use an array? All I want to do is get something like this for any <strong>arbitrary</strong> query:</p> <pre><code> col1, col2, col3, col4 1, 2, 3, 4 1, 2, 3, 4 1, 2, 3, 4 1, 2, 3, 4 ... </code></pre> <p>(That is, I need the output is in the right order and with the column names.)</p> <p>I'm very much a Perl novice, but I really thought this would be a simple problem. (I've done this before in Ruby and PHP, but I'm having trouble tracking down what I'm looking for in the Perl documentation.)</p> <p>Here's a pared down version of what I have at the moment:</p> <pre><code>use Data::Dumper; use DBI; my $database_path = '~/path/to/db.sqlite3'; $database = DBI-&gt;connect( "dbi:SQLite:dbname=$database_path", "", "", { RaiseError =&gt; 1, AutoCommit =&gt; 0, } ) or die "Couldn't connect to database: " . DBI-&gt;errstr; my $result = $database-&gt;prepare('select col1, col2, col3, col4 from some_view;') or die "Couldn't prepare query: " . $database-&gt;errstr; $result-&gt;execute or die "Couldn't execute query: " . $result-&gt;errstr; ########################################################################################### # What goes here to print the fields that I requested in the query? # It can be totally arbitrary or '*' -- "col1, col2, col3, col4" is just for illustration. # I would expect it to be called something like $result-&gt;fields ########################################################################################### while (my $row = $result-&gt;fetchrow_hashref) { my $csv = join(',', values %$row); print "$csv\n"; } $result-&gt;finish; $database-&gt;disconnect; </code></pre>
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