comment on

After two days of reading the CPAN doc on DBI and saying to myself "I KNOW it's here somewhere", I have to ask for help.

The following, I believe, retrieves *all* available metadata info for each column, and puts it into an array:

# Get all columns for each table of interest
#
my $sth_column_info
    = $dbh->column_info( $catalog, $schema, $table, undef );

my $aoa_ref = $sth_column_info->fetchall_arrayref;
$tables{$table} = $aoa_ref;

# Debugging only...
#
say $table;
for my $aref (@$aoa_ref) {
    my @list = map $_ // 'undef', @$aref;
    say join '|', @list;
}
[download]

Here is some sample output:

dw_contact_source
undef|dwcust1|dw_contact_source|contact_id|4|BIGINT|20|undef|undef|10|
+0|undef|undef|4|undef|undef|1|NO|undef|undef|undef|undef|undef|undef|
+undef|undef|undef|undef|undef|undef|undef|undef|undef|undef|undef|und
+ef|1|bigint(20)|undef|0
undef|dwcust1|dw_contact_source|company_id|4|SMALLINT|6|undef|undef|10
+|0|undef|undef|4|undef|undef|2|NO|undef|undef|undef|undef|undef|undef
+|undef|undef|undef|undef|undef|undef|undef|undef|undef|undef|undef|un
+def|1|smallint(6)|undef|0
undef|dwcust1|dw_contact_source|contact_type_id|4|TINYINT|4|undef|unde
+f|10|0|undef|undef|4|undef|undef|3|NO|undef|undef|undef|undef|undef|u
+ndef|undef|undef|undef|undef|undef|undef|undef|undef|undef|undef|unde
+f|undef||tinyint(4)|undef|0
undef|dwcust1|dw_contact_source|insert_date|11|DATETIME|19|undef|0|und
+ef|0|undef|undef|9|-79|undef|4|NO|undef|undef|undef|undef|undef|undef
+|undef|undef|undef|undef|undef|undef|undef|undef|undef|undef|undef|un
+def||datetime|undef|0
undef|dwcust1|dw_contact_source|update_date|11|DATETIME|19|undef|0|und
+ef|0|undef|undef|9|-79|undef|5|NO|undef|undef|undef|undef|undef|undef
+|undef|undef|undef|undef|undef|undef|undef|undef|undef|undef|undef|un
+def||datetime|undef|0
[download]

My questions are:

* Where is each field documented?

* Where is a list of translations for the codes appearing in some fields?

* Are there any helpful constants or other symbols anywhere, for referring to the columns and the codes within?

* If there *are* helpful symbols identifying these various fields, how can I use them in a call to fetchall_arrayref? (I tried fetchall_arrayref(qw/COLUMN_NAME .../), choosing some symbol-like strings from the documentation, but only got back undefs.)

I'd be very grateful if someone could help me move past this point of complete frustration!

In reply to DBI: interpreting column_info() by ibm1620

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