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NAME="FUNCTION.SETMOVESEQUENCE-P-NEW-SET-ID-INTEGER-P-SEQ-ID-INTEGER"
>8.116. setmovesequence(p_new_set_id integer, p_seq_id integer)</A
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> <P
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>Function Properties</B
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><P
><B
>Language: </B
>PLPGSQL</P
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>Return Type: </B
>bigint</P
>
setMoveSequence(p_seq_id, p_new_set_id) - This generates the
SET_MOVE_SEQUENCE event, after validation, notably that both sets
exist, are distinct, and have exactly the same subscription lists
</P><PRE
CLASS="PROGRAMLISTING"
>declare
v_old_set_id int4;
v_origin int4;
begin
-- ----
-- Get the sequences current set
-- ----
select seq_set into v_old_set_id from sl_sequence
where seq_id = p_seq_id;
if not found then
raise exception 'Slony-I: setMoveSequence(): sequence %d not found', p_seq_id;
end if;
-- ----
-- Check that both sets exist and originate here
-- ----
if p_new_set_id = v_old_set_id then
raise exception 'Slony-I: setMoveSequence(): set ids cannot be identical';
end if;
select set_origin into v_origin from sl_set
where set_id = p_new_set_id;
if not found then
raise exception 'Slony-I: setMoveSequence(): set % not found', p_new_set_id;
end if;
if v_origin != getLocalNodeId('_schemadoc') then
raise exception 'Slony-I: setMoveSequence(): set % does not originate on local node',
p_new_set_id;
end if;
select set_origin into v_origin from sl_set
where set_id = v_old_set_id;
if not found then
raise exception 'Slony-I: set % not found', v_old_set_id;
end if;
if v_origin != getLocalNodeId('_schemadoc') then
raise exception 'Slony-I: set % does not originate on local node',
v_old_set_id;
end if;
-- ----
-- Check that both sets are subscribed by the same set of nodes
-- ----
if exists (select true from sl_subscribe SUB1
where SUB1.sub_set = p_new_set_id
and SUB1.sub_receiver not in (select SUB2.sub_receiver
from sl_subscribe SUB2
where SUB2.sub_set = v_old_set_id))
then
raise exception 'Slony-I: subscriber lists of set % and % are different',
p_new_set_id, v_old_set_id;
end if;
if exists (select true from sl_subscribe SUB1
where SUB1.sub_set = v_old_set_id
and SUB1.sub_receiver not in (select SUB2.sub_receiver
from sl_subscribe SUB2
where SUB2.sub_set = p_new_set_id))
then
raise exception 'Slony-I: subscriber lists of set % and % are different',
v_old_set_id, p_new_set_id;
end if;
-- ----
-- Change the set the sequence belongs to
-- ----
perform setMoveSequence_int(p_seq_id, p_new_set_id);
return createEvent('_schemadoc', 'SET_MOVE_SEQUENCE',
p_seq_id::text, p_new_set_id::text);
end;</PRE
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