tableAddKey (tab_fqname) - if the table has not got a column of the form _Slony-I_<clustername>_rowID, then add it as a bigint, defaulted to nextval() for a sequence created for the cluster.
declare
p_tab_fqname alias for $1;
v_tab_fqname_quoted text default '';
v_attkind text default '';
v_attrow record;
v_have_serial bool default 'f';
begin
v_tab_fqname_quoted := slon_quote_input(p_tab_fqname);
--
-- Loop over the attributes of this relation
-- and add a "v" for every user column, and a "k"
-- if we find the Slony-I special serial column.
--
for v_attrow in select PGA.attnum, PGA.attname
from "pg_catalog".pg_class PGC,
"pg_catalog".pg_namespace PGN,
"pg_catalog".pg_attribute PGA
where slon_quote_brute(PGN.nspname) || '.' ||
slon_quote_brute(PGC.relname) = v_tab_fqname_quoted
and PGN.oid = PGC.relnamespace
and PGA.attrelid = PGC.oid
and not PGA.attisdropped
and PGA.attnum > 0
order by attnum
loop
if v_attrow.attname = '_Slony-I_schemadoc_rowID' then
v_attkind := v_attkind || 'k';
v_have_serial := 't';
else
v_attkind := v_attkind || 'v';
end if;
end loop;
--
-- A table must have at least one attribute, so not finding
-- anything means the table does not exist.
--
if not found then
raise exception 'Slony-I: table % not found', v_tab_fqname_quoted;
end if;
--
-- If it does not have the special serial column, we
-- have to add it. This will be only half way done.
-- The function to add the table to the set must finish
-- these definitions with NOT NULL and UNIQUE after
-- updating all existing rows.
--
if not v_have_serial then
execute 'lock table ' || v_tab_fqname_quoted ||
' in access exclusive mode';
execute 'alter table only ' || v_tab_fqname_quoted ||
' add column "_Slony-I_schemadoc_rowID" bigint;';
execute 'alter table only ' || v_tab_fqname_quoted ||
' alter column "_Slony-I_schemadoc_rowID" ' ||
' set default "pg_catalog".nextval(''sl_rowid_seq'');';
v_attkind := v_attkind || 'k';
end if;
--
-- Return the resulting Slony-I attkind
--
return v_attkind;
end;