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Listing 11-27. Using COLUMN FORMAT, HEADING, JUSTIFY, and LIKE SQL> 2 3 4 select , , from empno, ename, bdate msal as salary comm as commission employees;

Figure 2-13. This is a confirmation screen. If any of the parameters are incorrect, you can click the Back button and update the location of installation files, or change the type of installation (server or workstation).

__PACKAGE__->load_components("Tree::AdjacencyList", "Core"); __PACKAGE__->table("collections"); __PACKAGE__->add_columns( "collectionid", { data_type => "INTEGER", is_nullable => 0, size => undef }, "collectionname", { data_type => "TEXT", is_nullable => 0, size => undef }, "parentcollectionid", { data_type => "INT", is_nullable => 0, size => undef }, ); __PACKAGE__->set_primary_key("collectionid"); __PACKAGE__->belongs_to( "parentcollectionid", "Zotero::Schema::Result::Collections", { collectionid => "parentcollectionid" }, ); __PACKAGE__->has_many( "collections", "Zotero::Schema::Result::Collections", { "foreign.parentcollectionid" => "self.collectionid" }, ); # Created by DBIx::Class::Schema::Loader v0.04005 @ 2009-04-26 01:13:03 # DO NOT MODIFY THIS OR ANYTHING ABOVE! md5sum:SHNC6d0LncXwqIkdPgDgKg __PACKAGE__->parent_column("parentcollectionID"); 1; While the relationships themselves contain sufficient information to reconstruct the tree structure, the Tree::AdjacencyList component makes doing so a lot more convenient. To illustrate this, we ll create the following class in Zotero::ResultSet::Collections (you ll have to create the ResultSet directory yourself). This code outputs a data structure that is suitable for serializing in JSON format, either from the bottom root of the tree (in get_collections_tree) or from a specific node (in get_children). package Zotero::ResultSet::Collections; use warnings; use strict; use base qw/DBIx::Class::ResultSet/; sub get_collections_tree { my $self = shift; my @res; my $rs = $self->search( {parentcollectionid => undef}, {order_by => [ 'collectionname' ] }, );

EMPNO ENAME BDATE SALARY COMMISSION ------ -------- ----------- -------- ---------7369 SMITH 17-DEC-1965 800 7499 ALLEN 20-FEB-1961 1600 300 7521 WARD 22-FEB-1962 1250 500 ... 14 rows selected. SQL> SQL> SQL> SQL> SQL> col col col col / ename salary commission salary format format like heading a20 heading last_name justify center $9999.99 salary month|salary month BDATE salary COMMISSION ----------- --------- ---------17-DEC-1965 $800.00 20-FEB-1961 $1600.00 $300.00 22-FEB-1962 $1250.00 $500.00

EMPNO last_name ------ -------------------7369 SMITH 7499 ALLEN 7521 WARD ... 14 rows selected. SQL>

Figure 2-15. The final dialog of the installation wizard. If you select the Open the README file checkbox, then click the Finish button, and if the intallation computer has Adobe Reader installed, a .PDF document opens that details upgrades and enhancements made to Concordance since its last version.

while (my $node = $rs->next) { push @res, $self->get_children($node); } return \@res; } sub get_children { my ($self, $node ) = @_; my $res = {}; $res->{title} = $node->collectionname ; $res->{key} = $node->collectionid; my @kids = $node->children; $res->{expand} = 1; if (@kids) { my @children; foreach (@kids) { push @children, [$self->get_children($_)]; } $res->{children} = \@children; } return $res; } 1; Note that the use of recursion in this recipe is safe because DBIx::Class::Tree already does constraint checking to ensure that there are no infinite loops in our tree structure already. You ll need to write your own component to cope with graph data structures (e.g., nodes with multiple parents) stored in a database (or check CPAN to see if anyone else has done so) if you need this. You can see that we now have methods on our resultset to retrieve the whole tree (get_ collections_tree) and another method to retrieve the tree from a particular node. To understand how these subroutines work, we suggest writing a test case and stepping through them with the Perl debugger. Before we get this working in Catalyst, we have to make our Catalyst model and define the DSN. We can make the Catalyst model with Catalyst::Helper::Model::DBIC::Schema: $ script/myapp_create.pl model Zotero::Schema DBIC::Schema \ Zotero::Schema We also have to remember to put the connection information into myapp.conf: <Model Zotero::Schema> connect_info dbi::SQLite:dbname=__path_to('zotero.sqlite')__ </Model>

Note the effects of the vertical bar (|) in the COL SALARY command and the LIKE option for the COMMISSION column. Listings 11-27 and 11-28 illustrate an important property of the COLUMN command: you must always specify the column alias, not the original column name, as its argument. Listing 11-28. Using COLUMN NOPRINT, ON, OFF SQL> SQL> 2 3 4 col COMM NOPRINT select empno, ename, bdate , msal as salary , comm as commission from employees; -- Note the column name -- and the column alias