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NAME="FUNCTION.DETERMINEATTKINDUNIQUE-P-IDX-NAME-TEXT-P-TAB-FQNAME-NAME"
>8.45. determineattkindunique(p_idx_name text, p_tab_fqname name)</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
>text</P
>
determineAttKindUnique (tab_fqname, indexname)
Given a tablename, return the Slony-I specific attkind (used for the
log trigger) of the table. Use the specified unique index or the
primary key (if indexname is NULL).
</P><PRE
CLASS="PROGRAMLISTING"
>declare
v_tab_fqname_quoted text default '';
v_idx_name_quoted text;
v_idxrow record;
v_attrow record;
v_i integer;
v_attno int2;
v_attkind text default '';
v_attfound bool;
begin
v_tab_fqname_quoted := slon_quote_input(p_tab_fqname);
v_idx_name_quoted := slon_quote_brute(p_idx_name);
--
-- Ensure that the table exists
--
if (select PGC.relname
from "pg_catalog".pg_class PGC,
"pg_catalog".pg_namespace PGN
where slon_quote_brute(PGN.nspname) || '.' ||
slon_quote_brute(PGC.relname) = v_tab_fqname_quoted
and PGN.oid = PGC.relnamespace) is null then
raise exception 'Slony-I: table % not found', v_tab_fqname_quoted;
end if;
--
-- Lookup the tables primary key or the specified unique index
--
if p_idx_name isnull then
raise exception 'Slony-I: index name must be specified';
else
select PGXC.relname, PGX.indexrelid, PGX.indkey
into v_idxrow
from "pg_catalog".pg_class PGC,
"pg_catalog".pg_namespace PGN,
"pg_catalog".pg_index PGX,
"pg_catalog".pg_class PGXC
where slon_quote_brute(PGN.nspname) || '.' ||
slon_quote_brute(PGC.relname) = v_tab_fqname_quoted
and PGN.oid = PGC.relnamespace
and PGX.indrelid = PGC.oid
and PGX.indexrelid = PGXC.oid
and PGX.indisunique
and slon_quote_brute(PGXC.relname) = v_idx_name_quoted;
if not found then
raise exception 'Slony-I: table % has no unique index %',
v_tab_fqname_quoted, v_idx_name_quoted;
end if;
end if;
--
-- Loop over the tables attributes and check if they are
-- index attributes. If so, add a "k" to the return value,
-- otherwise add a "v".
--
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
v_attfound = 'f';
v_i := 0;
loop
select indkey[v_i] into v_attno from "pg_catalog".pg_index
where indexrelid = v_idxrow.indexrelid;
if v_attno isnull or v_attno = 0 then
exit;
end if;
if v_attrow.attnum = v_attno then
v_attfound = 't';
exit;
end if;
v_i := v_i + 1;
end loop;
if v_attfound then
v_attkind := v_attkind || 'k';
else
v_attkind := v_attkind || 'v';
end if;
end loop;
-- Strip off trailing v characters as they are not needed by the logtrigger
v_attkind := pg_catalog.rtrim(v_attkind, 'v');
--
-- Return the resulting attkind
--
return v_attkind;
end;</PRE
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