Slony-I 2.2.10 Documentation
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# 8.103. setdropsequence_int(p_seq_id integer)

Function Properties

Language: PLPGSQL

Return Type: integer

setDropSequence_int (seq_id) This processes the SET_DROP_SEQUENCE event. On remote nodes that subscribe to the set containing sequence seq_id, drop the sequence from the replication set.

    declare
    	v_set_id		int4;
    	v_local_node_id		int4;
    	v_set_origin		int4;
    	v_sub_provider		int4;
    	v_relkind			char;
    	v_sync_row			record;
    begin
    	-- ----
    	-- Grab the central configuration lock
    	-- ----
    	lock table sl_config_lock;

    	-- ----
    	-- Determine set id for this sequence
    	-- ----
    	select seq_set into v_set_id from sl_sequence where seq_id = p_seq_id;

    	-- ----
    	-- Ensure sequence exists
    	-- ----
    	if not found then
    		return 0;
    	end if;

    	-- ----
    	-- For sets with a remote origin, check that we are subscribed
    	-- to that set. Otherwise we ignore the sequence because it might
    	-- not even exist in our database.
    	-- ----
    	v_local_node_id := getLocalNodeId('_schemadoc');
    	select set_origin into v_set_origin
    			from sl_set
    			where set_id = v_set_id;
    	if not found then
    		raise exception 'Slony-I: setDropSequence_int(): set % not found',
    				v_set_id;
    	end if;
    	if v_set_origin != v_local_node_id then
    		select sub_provider into v_sub_provider
    				from sl_subscribe
    				where sub_set = v_set_id
    				and sub_receiver = getLocalNodeId('_schemadoc');
    		if not found then
    			return 0;
    		end if;
    	end if;

    	-- ----
    	-- drop the sequence from sl_sequence, sl_seqlog
    	-- ----
    	delete from sl_seqlog where seql_seqid = p_seq_id;
    	delete from sl_sequence where seq_id = p_seq_id;

    	return p_seq_id;
    end;

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