Enlarge wiki content for MySQL databases (#1071).

Limit changed from 64KB to 16MB.

git-svn-id: svn+ssh://rubyforge.org/var/svn/redmine/trunk@3254 e93f8b46-1217-0410-a6f0-8f06a7374b81

db/migrate/20091227112908_change_wiki_contents_text_limit.rb

@@ -0,0 +1,16 @@
+class ChangeWikiContentsTextLimit < ActiveRecord::Migration
+  def self.up
+    # Migrates MySQL databases only
+    # Postgres would raise an error (see http://dev.rubyonrails.org/ticket/3818)
+    # Not fixed in Rails 2.3.5
+    if ActiveRecord::Base.connection.adapter_name =~ /mysql/i
+      max_size = 16.megabytes
+      change_column :wiki_contents, :text, :text, :limit => max_size
+      change_column :wiki_content_versions, :data, :binary, :limit => max_size
+    end
+  end
+
+  def self.down
+    # no-op
+  end
+end