The attached patch makes the \d output for psql on a sequence show
which table/column owns the sequence. The table already showed the
dependency the other way through the default value, but going from
sequence back to table was not possible.
Comments/reviews?
--
Magnus Hagander
Me: http://www.hagander.net/
Work: http://www.redpill-linpro.com/
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index d5466f8..21e9171 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -1609,6 +1609,42 @@ describeOneTableDetails(const char *schemaname,
PQclear(result);
}
}
+ else if (tableinfo.relkind == 'S')
+ {
+ /* Footer information about a sequence */
+ PGresult *result = NULL;
+
+ /* Get the column that owns this sequence */
+ printfPQExpBuffer(&buf, "SELECT quote_ident(nspname) || '.' ||"
+ "\n quote_ident(relname) || '.' ||"
+ "\n quote_ident(attname)"
+ "\nFROM pg_class"
+ "\nINNER JOIN pg_depend ON pg_class.oid=pg_depend.refobjid"
+ "\nINNER JOIN pg_namespace ON pg_namespace.oid=pg_class.relnamespace"
+ "\nINNER JOIN pg_attribute ON ("
+ "\n pg_attribute.attrelid=pg_class.oid AND"
+ "\n pg_attribute.attnum=pg_depend.refobjsubid)"
+ "\nWHERE classid='pg_class'::regclass"
+ "\n AND objid=%s"
+ "\n AND deptype='a'",
+ oid);
+
+ result = PSQLexec(buf.data, false);
+ if (!result)
+ goto error_return;
+ else if (PQntuples(result) > 1)
+ {
+ PQclear(result);
+ goto error_return;
+ }
+ else if (PQntuples(result) == 1)
+ {
+ printfPQExpBuffer(&buf, _("Owned by: %s"),
+ PQgetvalue(result, 0, 0));
+ printTableAddFooter(&cont, buf.data);
+ }
+ PQclear(result);
+ }
else if (tableinfo.relkind == 'r' || tableinfo.relkind == 'f')
{
/* Footer information about a table */
--
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