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eventstore

1.4.2
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Event store using PostgreSQL for persistence.

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eventstore priv event_store migrations v1.3.2.sql
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priv/event_store/migrations/v1.3.2.sql 

DO $migration$

BEGIN

  CREATE OR REPLACE FUNCTION notify_events()

    RETURNS trigger AS $$

  DECLARE

    old_stream_version bigint;

    channel text;

    payload text;

  BEGIN

      -- Payload text contains:

      --  * `stream_uuid`

      --  * `stream_id`

      --  * first `stream_version`

      --  * last `stream_version`

      -- Each separated by a comma (e.g. 'stream-12345,1,1,5')



      IF TG_OP = 'UPDATE' THEN

        old_stream_version := OLD.stream_version + 1;

      ELSE

        old_stream_version := 1;

      END IF;



      channel := TG_TABLE_SCHEMA || '.events';

      payload := NEW.stream_uuid || ',' || NEW.stream_id || ',' || old_stream_version || ',' || NEW.stream_version;



      -- Notify events to listeners

      PERFORM pg_notify(channel, payload);



      RETURN NULL;

  END;

  $$ LANGUAGE plpgsql;



  -- Record schema migration

  INSERT INTO schema_migrations (major_version, minor_version, patch_version) VALUES (1, 3, 2);

END;

$migration$ LANGUAGE plpgsql;