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use strict;
use Data::Dumper;
...
while ( my @row = $sth->fetchrow_array ) {
    print "@row\n";
}

:!perl  test_dbi.pl                                                   
+                              
DBD::mysql::st execute failed: Unknown column 'Symbol' in 'field list'
+ at test_dbi.pl line 21.
SQL Error: Unknown column 'Symbol' in 'field list'

mysql> select Symbol from gene_info where GeneID = "812222";
...
| motif_finder |
+--------------+
1 rows in set (0.00 sec)