From: Darren Chamberlain <dlc@sevenroot.org>
Date: Thu, 21 Mar 2002 15:47:08 +0000 (+0000)
Subject: Modified POD to include a complex description of the format of the data structure... 
X-Git-Tag: v0.01~58^2~10
X-Git-Url: http://git.shadowcat.co.uk/gitweb/gitweb.cgi?a=commitdiff_plain;h=8295a8cca61986fbccca2c381867219a9403640c;p=dbsrgits%2FSQL-Translator.git

Modified POD to include a complex description of the format of the data structure returned by parse.
Added myself to the AUTHORS section.
---

diff --git a/lib/SQL/Translator/Parser.pm b/lib/SQL/Translator/Parser.pm
index 5e7cda9..6bae3b8 100644
--- a/lib/SQL/Translator/Parser.pm
+++ b/lib/SQL/Translator/Parser.pm
@@ -1,7 +1,7 @@
 package SQL::Translator::Parser;
 
 # ----------------------------------------------------------------------
-# $Id: Parser.pm,v 1.1.1.1.2.1 2002-03-15 20:13:46 dlc Exp $
+# $Id: Parser.pm,v 1.1.1.1.2.2 2002-03-21 15:47:08 dlc Exp $
 # ----------------------------------------------------------------------
 # Copyright (C) 2002 Ken Y. Clark <kycl4rk@users.sourceforge.net>,
 #                    darren chamberlain <darren@cpan.org>
@@ -23,7 +23,7 @@ package SQL::Translator::Parser;
 
 use strict;
 use vars qw( $VERSION );
-$VERSION = sprintf "%d.%02d", q$Revision: 1.1.1.1.2.1 $ =~ /(\d+)\.(\d+)/;
+$VERSION = sprintf "%d.%02d", q$Revision: 1.1.1.1.2.2 $ =~ /(\d+)\.(\d+)/;
 
 sub parse { "" }
 
@@ -33,6 +33,7 @@ sub parse { "" }
 # Enough! or Too much.
 # William Blake
 #-----------------------------------------------------
+__END__
 
 =head1 NAME
 
@@ -40,15 +41,131 @@ SQL::Translator::Parser - base object for parsers
 
 =head1 DESCRIPTION
 
-Parser modules that get invoked by SQL::Translator need to implement
-a single function: B<parse>.  This function will be called by the
-SQL::Translator instance as $class::parse($data_as_string).  Other
-than that, the classes are free to define any helper functions, or
-use any design pattern internally that make the most sense.
+Parser modules that get invoked by SQL::Translator need to implement a
+single function: B<parse>.  This function will be called by the
+SQL::Translator instance as $class::parse($tr, $data_as_string), where
+$tr is a SQL::Translator instance.  Other than that, the classes are
+free to define any helper functions, or use any design pattern
+internally that make the most sense.
 
-=head1 AUTHOR
+=head1 FORMAT OF THE DATA STRUCTURE
 
-Ken Y. Clark, kclark@logsoft.com
+The data structure returned from the B<parse> function has a very
+particular format.
+
+=over 4
+
+=item o
+
+The data structure should be a reference to a hash, the keys of which
+are table names.
+
+=item o
+
+The values associated with each table should also be a reference to a
+hash.  This hash should have several keys, enumerated below.
+
+=back
+
+=over 15
+
+=item B<type>
+
+This is the type of the table, if applicable, as a string, or undef if not (for
+example, if the database does not have multiple options).  For MySQL,
+this value might include MyISAM, HEAP, or similar.
+
+=item B<indeces>
+
+The indeces keys is a reference to an array of hashrefs.  Each hashref
+defines one index, and has the keys 'name' (if defined, it will be a
+string), 'type' (a string), and 'fields' (a reference to another
+array).  For example, a table in a MySQL database with two indexes,
+created as:
+
+  PRIMARY KEY (id),
+  KEY foo_idx (foo),
+  KEY foo_bar_idx (foo, bar),
+
+would be described in the indeces element as:
+
+  [
+    {
+      'type' => 'primary_key',
+      'fields' => [
+                    'id'
+                  ],
+      'name' => undef,
+    },
+    {
+      'type' => 'normal',
+      'fields' => [
+                    'foo'
+                  ],
+      'name' => 'foo_idx',
+    },
+    {
+      'type' => 'normal',
+      'fields' => [
+                    'foo',
+                    'bar',
+                  ],
+      'name' => 'foo_bar_idx',
+    },
+  ]
+
+=item B<fields>
+
+The fields element is a refernce to a hash; the keys of this hash are
+the row names from the table, and each value fills in this template:
+
+  { 
+    type           => 'field',
+    name           => '',     # same as the key
+    data_type      => '',     # in the db's jargon,
+                              # i.e., MySQL => int, Oracale => INTEGER
+    size           => '',     # int
+    null           => 1 | 0,  # boolean
+    default        => '',
+    is_auto_inc    => 1 1 0,  # boolean
+    is_primary_key => 1 | 0,  # boolean
+  } 
+
+So a row defined as:
+
+  username CHAR(8) NOT NULL DEFAULT 'nobody',
+  KEY username_idx (username)
+
+would be represented as:
+
+  'fields => {
+    'username' => { 
+      type           => 'field',
+      name           => 'username',
+      data_type      => 'char',
+      size           => '8',
+      null           => undef,
+      default        => 'nobody',
+      is_auto_inc    => undef,
+      is_primary_key => undef,
+    },
+  },
+  'indeces' => [
+    {
+      'name' => 'username_idx',
+      'fields' => [
+                    'username'
+                  ],
+      'type' => 'normal',
+    },
+  ],
+
+=back
+
+
+=head1 AUTHORS
+
+Ken Y. Clark, E<lt>kclark@logsoft.comE<gt>, darren chamberlain E<lt>darren@cpan.orgE<gt>
 
 =head1 SEE ALSO