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module Gitlab
module Database
def self.adapter_name
connection.adapter_name
end
def self.mysql?
adapter_name.casecmp('mysql2').zero?
end
def self.postgresql?
adapter_name.casecmp('postgresql').zero?
end
def self.version
database_version.match(/\A(?:PostgreSQL |)([^\s]+).*\z/)[1]
end
def self.nulls_last_order(field, direction = 'ASC')
order = "#{field} #{direction}"
if Gitlab::Database.postgresql?
order << ' NULLS LAST'
else
# `field IS NULL` will be `0` for non-NULL columns and `1` for NULL
# columns. In the (default) ascending order, `0` comes first.
order.prepend("#{field} IS NULL, ") if direction == 'ASC'
end
order
end
def true_value
if Gitlab::Database.postgresql?
"'t'"
else
1
end
end
def false_value
if Gitlab::Database.postgresql?
"'f'"
else
0
end
end
private
def self.connection
ActiveRecord::Base.connection
end
def self.database_version
row = connection.execute("SELECT VERSION()").first
if postgresql?
row['version']
else
row.first
end
end
end
end
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