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require 'active_record/connection_adapters/sqlserver/showplan/printer_table'
require 'active_record/connection_adapters/sqlserver/showplan/printer_xml'
module ActiveRecord
module ConnectionAdapters
module Sqlserver
module Showplan
OPTION_ALL = 'SHOWPLAN_ALL'
OPTION_TEXT = 'SHOWPLAN_TEXT'
OPTION_XML = 'SHOWPLAN_XML'
OPTIONS = [OPTION_ALL, OPTION_TEXT, OPTION_XML]
def explain(arel, binds = [])
sql = to_sql(arel)
result = with_showplan_on { do_exec_query(sql, 'EXPLAIN', binds) }
printer = showplan_printer.new(result)
printer.pp
end
protected
def with_showplan_on
set_showplan_option(true)
yield
ensure
set_showplan_option(false)
end
def set_showplan_option(enable = true)
sql = "SET #{option} #{enable ? 'ON' : 'OFF'}"
raw_connection_do(sql)
rescue Exception => e
raise ActiveRecordError, "#{option} could not be turned #{enable ? 'ON' : 'OFF'}, perhaps you do not have SHOWPLAN permissions?"
end
def option
(SQLServerAdapter.showplan_option || OPTION_ALL).tap do |opt|
raise(ArgumentError, "Unknown SHOWPLAN option #{opt.inspect} found.") if OPTIONS.exclude?(opt)
end
end
def showplan_all?
option == OPTION_ALL
end
def showplan_text?
option == OPTION_TEXT
end
def showplan_xml?
option == OPTION_XML
end
def showplan_printer
case option
when OPTION_XML then PrinterXml
when OPTION_ALL, OPTION_TEXT then PrinterTable
else PrinterTable
end
end
end
end
end
end
Version data entries
22 entries across 22 versions & 2 rubygems