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Mojo-DB-Results-Role-Struct-v0.1.1
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 / Mojo::DB::Results::Role::Struct

NAME

Mojo::DB::Results::Role::Struct - Database query results as structs

SYNOPSIS

  use Mojo::SQLite;
  my $sqlite = Mojo::SQLite->new(...);
  my $results = $sqlite->db->query('SELECT * FROM "table" WHERE "foo" = ?', 42);
  my $struct = $results->with_roles('Mojo::DB::Results::Role::Struct')->structs->first;
  my $bar = $struct->bar; # dies unless column "bar" exists

  use Mojo::Pg;
  my $pg = Mojo::Pg->new(...)->with_roles('Mojo::DB::Role::ResultsRoles');
  push @{$pg->results_roles}, 'Mojo::DB::Results::Role::Struct';
  my $results = $pg->db->query('SELECT "foo", "bar" FROM "table"');
  foreach my $row ($results->structs->each) {
    my $foo = $row->foo;
    my $bar = $row->baz; # dies
  }

DESCRIPTION

This role can be applied to a results object for Mojo::Pg or similar database APIs. It provides "struct" and "structs" methods which return Struct::Dumb records, providing read-only accessors only for the expected column names. Note that a column name that is not a valid identifier is trickier to access in this manner.

  my $row = $results->struct;
  my $col_name = 'foo.bar';
  my $val = $row->$col_name;
  # or
  my $val = $row->${\'foo.bar'};

You can apply the role to a results object using "with_roles" in Mojo::Base, or apply it to all results objects created by a database manager using Mojo::DB::Role::ResultsRoles as shown in the synopsis.

METHODS

Mojo::DB::Results::Role::Struct composes the following methods.

struct

  my $struct = $results->struct;

Fetch next row from the statement handle with the result object's array method, and return it as a struct.

structs

  my $collection = $results->structs;

Fetch all rows from the statement handle with the result object's arrays method, and return them as a Mojo::Collection object containing structs.

BUGS

Report any issues on the public bugtracker.

AUTHOR

Dan Book <dbook@cpan.org>

COPYRIGHT AND LICENSE

This software is Copyright (c) 2019 by Dan Book.

This is free software, licensed under:

  The Artistic License 2.0 (GPL Compatible)

SEE ALSO

Mojo::DB::Role::ResultsRoles, Mojo::Pg, Mojo::SQLite, Mojo::mysql