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# frozen_string_literal: true
# Redmine - project management software
# Copyright (C) 2006- 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
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