defmodule EctoPSQLExtras.Locks do
  def title do
    "Queries with active exclusive locks"
  end

  def query do
"""
/* Queries with active exclusive locks */

SELECT
  pg_stat_activity.pid,
  pg_class.relname,
  pg_locks.transactionid,
  pg_locks.granted,
  pg_locks.mode,
  pg_stat_activity.query AS query_snippet,
  age(now(),pg_stat_activity.query_start) AS "age"
FROM pg_stat_activity,pg_locks left
OUTER JOIN pg_class
  ON (pg_locks.relation = pg_class.oid)
WHERE pg_stat_activity.query <> '<insufficient privilege>'
  AND pg_locks.pid = pg_stat_activity.pid
  AND pg_locks.mode IN ('ExclusiveLock', 'AccessExclusiveLock', 'RowExclusiveLock')
  AND pg_stat_activity.pid <> pg_backend_pid() order by query_start;
"""
  end
end