123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108 |
- # frozen_string_literal: true
-
- # Redmine - project management software
- # Copyright (C) 2006-2022 Jean-Philippe Lang
- #
- # This program is free software; you can redistribute it and/or
- # modify it under the terms of the GNU General Public License
- # as published by the Free Software Foundation; either version 2
- # of the License, or (at your option) any later version.
- #
- # This program is distributed in the hope that it will be useful,
- # but WITHOUT ANY WARRANTY; without even the implied warranty of
- # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- # GNU General Public License for more details.
- #
- # You should have received a copy of the GNU General Public License
- # along with this program; if not, write to the Free Software
- # Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
-
- module Redmine
- # Helper module to get information about the Redmine database
- module Database
- class << self
- # Returns true if the database is SQLite
- def sqlite?
- ActiveRecord::Base.connection.adapter_name =~ /sqlite/i
- end
-
- # Returns true if the database is PostgreSQL
- def postgresql?
- /postgresql/i.match?(ActiveRecord::Base.connection.adapter_name)
- end
-
- # Returns the PostgreSQL version or nil if another DBMS is used
- def postgresql_version
- postgresql? ? ActiveRecord::Base.connection.send(:postgresql_version) : nil
- end
-
- # Returns true if the database is a PostgreSQL >=9.0 database with the unaccent extension installed
- def postgresql_unaccent?
- if postgresql?
- return @postgresql_unaccent unless @postgresql_unaccent.nil?
-
- begin
- sql =
- "SELECT name FROM pg_available_extensions " \
- "WHERE installed_version IS NOT NULL and name = 'unaccent'"
- @postgresql_unaccent =
- postgresql_version >= 90000 &&
- ActiveRecord::Base.connection.select_value(sql).present?
- rescue
- false
- end
- else
- false
- end
- end
-
- # Returns true if the database is MySQL
- def mysql?
- /mysql/i.match?(ActiveRecord::Base.connection.adapter_name)
- end
-
- # Returns a SQL statement for case/accent (if possible) insensitive match
- def like(left, right, options={})
- neg = (options[:match] == false ? 'NOT ' : '')
-
- if postgresql?
- if postgresql_unaccent?
- "unaccent(#{left}) #{neg}ILIKE unaccent(#{right})"
- else
- "#{left} #{neg}ILIKE #{right}"
- end
- elsif mysql?
- "#{left} #{neg}LIKE #{right}"
- else
- "#{left} #{neg}LIKE #{right} ESCAPE '\\'"
- end
- end
-
- # Returns a SQL statement to cast a timestamp column to a date given a time zone
- # Returns nil if not implemented for the current database
- def timestamp_to_date(column, time_zone)
- if postgresql?
- if time_zone
- identifier = ActiveSupport::TimeZone.find_tzinfo(time_zone.name).identifier
- "(#{column}::timestamptz AT TIME ZONE '#{identifier}')::date"
- else
- "#{column}::date"
- end
- elsif mysql?
- if time_zone
- user_identifier = ActiveSupport::TimeZone.find_tzinfo(time_zone.name).identifier
- local_identifier = ActiveSupport::TimeZone.find_tzinfo(Time.zone.name).identifier
- "DATE(CONVERT_TZ(#{column},'#{local_identifier}', '#{user_identifier}'))"
- else
- "DATE(#{column})"
- end
- end
- end
-
- # Resets database information
- def reset
- @postgresql_unaccent = nil
- end
- end
- end
- end
|