database/postgres
1
0
Fork 0
mirror of https://github.com/postgres/postgres.git synced 2025-07-08 11:42:09 +03:00
Code Activity

Add temporal FOREIGN KEY contraints

Browse Source 
Add PERIOD clause to foreign key constraint definitions.  This is
supported for range and multirange types.  Temporal foreign keys check
for range containment instead of equality.

This feature matches the behavior of the SQL standard temporal foreign
keys, but it works on PostgreSQL's native ranges instead of SQL's
"periods", which don't exist in PostgreSQL (yet).

Reference actions ON {UPDATE,DELETE} {CASCADE,SET NULL,SET DEFAULT}
are not supported yet.

Author: Paul A. Jungwirth <pj@illuminatedcomputing.com>
Reviewed-by: Peter Eisentraut <peter@eisentraut.org>
Reviewed-by: jian he <jian.universality@gmail.com>
Discussion: https://www.postgresql.org/message-id/flat/CA+renyUApHgSZF9-nd-a0+OPGharLQLO=mDHcY4_qQ0+noCUVg@mail.gmail.com
This commit is contained in:
Peter Eisentraut
2024-03-24 07:37:13 +01:00
parent b1fe8efdf1
commit 34768ee361
16 changed files with 2790 additions and 118 deletions
Download Patch File Download Diff File Expand all files Collapse all files

17
src/backend/utils/adt/ruleutils.c
View File

@ -338,7 +338,7 @@ static char *pg_get_viewdef_worker(Oid viewoid,
int prettyFlags, int wrapColumn);
static char *pg_get_triggerdef_worker(Oid trigid, bool pretty);
static int decompile_column_index_array(Datum column_index_array, Oid relId,
StringInfo buf);
bool withPeriod, StringInfo buf);
static char *pg_get_ruledef_worker(Oid ruleoid, int prettyFlags);
static char *pg_get_indexdef_worker(Oid indexrelid, int colno,
const Oid *excludeOps,
@ -2253,7 +2253,8 @@ pg_get_constraintdef_worker(Oid constraintId, bool fullCommand,
val = SysCacheGetAttrNotNull(CONSTROID, tup,
Anum_pg_constraint_conkey);
decompile_column_index_array(val, conForm->conrelid, &buf);
/* If it is a temporal foreign key then it uses PERIOD. */
decompile_column_index_array(val, conForm->conrelid, conForm->conperiod, &buf);
/* add foreign relation name */
appendStringInfo(&buf, ") REFERENCES %s(",
@ -2264,7 +2265,7 @@ pg_get_constraintdef_worker(Oid constraintId, bool fullCommand,
val = SysCacheGetAttrNotNull(CONSTROID, tup,
Anum_pg_constraint_confkey);
decompile_column_index_array(val, conForm->confrelid, &buf);
decompile_column_index_array(val, conForm->confrelid, conForm->conperiod, &buf);
appendStringInfoChar(&buf, ')');
@ -2350,7 +2351,7 @@ pg_get_constraintdef_worker(Oid constraintId, bool fullCommand,
if (!isnull)
{
appendStringInfoString(&buf, " (");
decompile_column_index_array(val, conForm->conrelid, &buf);
decompile_column_index_array(val, conForm->conrelid, false, &buf);
appendStringInfoChar(&buf, ')');
}
@ -2385,7 +2386,7 @@ pg_get_constraintdef_worker(Oid constraintId, bool fullCommand,
val = SysCacheGetAttrNotNull(CONSTROID, tup,
Anum_pg_constraint_conkey);
keyatts = decompile_column_index_array(val, conForm->conrelid, &buf);
keyatts = decompile_column_index_array(val, conForm->conrelid, false, &buf);
if (conForm->conperiod)
appendStringInfoString(&buf, " WITHOUT OVERLAPS");
@ -2591,7 +2592,7 @@ pg_get_constraintdef_worker(Oid constraintId, bool fullCommand,
*/
static int
decompile_column_index_array(Datum column_index_array, Oid relId,
StringInfo buf)
bool withPeriod, StringInfo buf)
{
Datum *keys;
int nKeys;
@ -2610,7 +2611,9 @@ decompile_column_index_array(Datum column_index_array, Oid relId,
if (j == 0)
appendStringInfoString(buf, quote_identifier(colName));
else
appendStringInfo(buf, ", %s", quote_identifier(colName));
appendStringInfo(buf, ", %s%s",
(withPeriod && j == nKeys - 1) ? "PERIOD " : "",
quote_identifier(colName));
}
return nKeys;