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85 lines
3.2 KiB
85 lines
3.2 KiB
#-- encoding: UTF-8
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#-- copyright
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# OpenProject is a project management system.
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# Copyright (C) 2012-2017 the OpenProject Foundation (OPF)
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#
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# This program is free software; you can redistribute it and/or
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# modify it under the terms of the GNU General Public License version 3.
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#
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# OpenProject is a fork of ChiliProject, which is a fork of Redmine. The copyright follows:
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# Copyright (C) 2006-2017 Jean-Philippe Lang
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# Copyright (C) 2010-2013 the ChiliProject Team
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#
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# This program is free software; you can redistribute it and/or
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# modify it under the terms of the GNU General Public License
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# as published by the Free Software Foundation; either version 2
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# of the License, or (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program; if not, write to the Free Software
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# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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#
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# See doc/COPYRIGHT.rdoc for more details.
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#++
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module OpenProject
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# This module provides some information about the currently used database
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# adapter. It can be used to write code specific to certain database
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# vendors which, while not not encouraged, is sometimes necessary due to
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# syntax differences.
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module Database
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# This method returns a hash which maps the identifier of the supported
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# adapter to a regex matching the adapter_name.
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def self.supported_adapters
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@adapters ||= ({
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mysql: /mysql/i,
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postgresql: /postgres/i
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})
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end
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# Get the raw name of the currently used database adapter.
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# This string is set by the used adapter gem.
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def self.adapter_name(connection)
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connection.adapter_name
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end
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# returns the identifier of the specified connection
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# (defaults to ActiveRecord::Base.connection)
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def self.name(connection = ActiveRecord::Base.connection)
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supported_adapters.find(proc { [:unknown, //] }) { |_adapter, regex|
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adapter_name(connection) =~ regex
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}[0]
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end
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# Provide helper methods to quickly check the database type
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# OpenProject::Database.mysql? returns true, if we have a MySQL DB
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# Also allows specification of a connection e.g.
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# OpenProject::Database.mysql?(my_connection)
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supported_adapters.keys.each do |adapter|
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(class << self; self; end).class_eval do
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define_method(:"#{adapter.to_s}?") do |connection = ActiveRecord::Base.connection|
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send(:name, connection) == adapter
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end
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end
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end
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# Return the version of the underlying database engine.
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# Set the +raw+ argument to true to return the unmangled string
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# from the database.
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def self.version(raw = false)
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case name
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when :mysql
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version = ActiveRecord::Base.connection.select_value('SELECT VERSION()')
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when :postgresql
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version = ActiveRecord::Base.connection.select_value('SELECT version()')
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raw ? version : version.match(/\APostgreSQL (\S+)/i)[1]
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end
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end
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end
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end
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