This patch implements ORACLE's COMMENT SQL command.
>From the ORACLE 7 SQL Language Reference Manual:
-----------------------------------------------------
COMMENT
Purpose:
To add a comment about a table, view, snapshot, or
column into the data dictionary.
Prerequisites:
The table, view, or snapshot must be in your own
schema
or you must have COMMENT ANY TABLE system privilege.
Syntax:
COMMENT ON [ TABLE table ] |
[ COLUMN table.column] IS 'text'
You can effectively drop a comment from the database
by setting it to the empty string ''.
-----------------------------------------------------
Example:
COMMENT ON TABLE workorders IS
'Maintains base records for workorder information';
COMMENT ON COLUMN workorders.hours IS
'Number of hours the engineer worked on the task';
to drop a comment:
COMMENT ON COLUMN workorders.hours IS '';
The current patch will simply perform the insert into
pg_description, as per the TODO. And, of course, when
the table is dropped, any comments relating to it
or any of its attributes are also dropped. I haven't
looked at the ODBC source yet, but I do know from
an ODBC client standpoint that the standard does
support the notion of table and column comments.
Hopefully the ODBC driver is already fetching these
values from pg_description, but if not, it should be
trivial.
Hope this makes the grade,
Mike Mascari
(mascarim@yahoo.com)
This commit is contained in:
Bruce Momjian
parent
55fa71a9e9
commit
7acc237744
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@ -7,7 +7,7 @@
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*
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*
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* IDENTIFICATION
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* $Header: /cvsroot/pgsql/src/backend/catalog/heap.c,v 1.103 1999/10/07 05:48:03 tgl Exp $
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* $Header: /cvsroot/pgsql/src/backend/catalog/heap.c,v 1.104 1999/10/15 01:49:39 momjian Exp $
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*
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*
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* INTERFACE ROUTINES
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@ -38,6 +38,7 @@
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#include "catalog/index.h"
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#include "catalog/indexing.h"
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#include "catalog/pg_attrdef.h"
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#include "catalog/pg_description.h"
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#include "catalog/pg_index.h"
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#include "catalog/pg_inherits.h"
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#include "catalog/pg_ipl.h"
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@ -67,6 +68,7 @@ static void AddNewRelationTuple(Relation pg_class_desc,
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Relation new_rel_desc, Oid new_rel_oid, unsigned natts,
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char relkind, char *temp_relname);
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static void AddToNoNameRelList(Relation r);
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static void DeleteAttributeTuples(Relation rel);
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static void DeleteRelationTuple(Relation rel);
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static void DeleteTypeTuple(Relation rel);
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@ -861,10 +863,11 @@ heap_create_with_catalog(char *relname,
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* 2) remove inheritance information
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* 3) remove indexes
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* 4) remove pg_class tuple
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* 5) remove pg_attribute tuples
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* 6) remove pg_type tuples
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* 7) RemoveConstraints ()
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* 8) unlink relation
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* 5) remove pg_attribute tuples and related descriptions
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* 6) remove pg_description tuples
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* 7) remove pg_type tuples
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* 8) RemoveConstraints ()
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* 9) unlink relation
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*
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* old comments
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* Except for vital relations, removes relation from
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@ -1269,18 +1272,152 @@ DeleteAttributeTuples(Relation rel)
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attnum++)
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{
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if (HeapTupleIsValid(tup = SearchSysCacheTupleCopy(ATTNUM,
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ObjectIdGetDatum(RelationGetRelid(rel)),
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Int16GetDatum(attnum),
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ObjectIdGetDatum(RelationGetRelid(rel)),
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Int16GetDatum(attnum),
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0, 0)))
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{
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heap_delete(pg_attribute_desc, &tup->t_self, NULL);
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pfree(tup);
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DeleteComments(tup->t_data->t_oid);
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heap_delete(pg_attribute_desc, &tup->t_self, NULL);
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pfree(tup);
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}
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}
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heap_close(pg_attribute_desc, RowExclusiveLock);
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}
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/* ----------------------------------------------------------
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* CreateComments
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*
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* This routine is handed the oid and the command associated
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* with that id and will insert, update, or delete (if the
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* comment is an empty string or a NULL pointer) the associated
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* comment from the system cataloge, pg_description.
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*
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* ----------------------------------------------------------
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*/
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void
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CreateComments(Oid oid, char *comment)
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{
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Relation description;
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TupleDesc tupDesc;
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HeapScanDesc scan;
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ScanKeyData entry;
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HeapTuple desctuple, searchtuple;
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Datum values[Natts_pg_description];
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char nulls[Natts_pg_description];
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char replaces[Natts_pg_description];
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bool modified = false;
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int i;
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/*** Open pg_description, form a new tuple, if necessary ***/
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description = heap_openr(DescriptionRelationName, RowExclusiveLock);
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tupDesc = description->rd_att;
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if ((comment != NULL) && (strlen(comment) > 0)) {
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for (i = 0; i < Natts_pg_description; i++) {
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nulls[i] = ' ';
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replaces[i] = 'r';
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values[i] = (Datum) NULL;
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}
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i = 0;
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values[i++] = ObjectIdGetDatum(oid);
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values[i++] = (Datum) fmgr(F_TEXTIN, comment);
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}
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/*** Now, open pg_description and attempt to find the old tuple ***/
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ScanKeyEntryInitialize(&entry, 0x0, Anum_pg_description_objoid, F_OIDEQ,
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ObjectIdGetDatum(oid));
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scan = heap_beginscan(description, false, SnapshotNow, 1, &entry);
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searchtuple = heap_getnext(scan, 0);
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/*** If a previous tuple exists, either delete it or prepare a replacement ***/
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if (HeapTupleIsValid(searchtuple)) {
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/*** If the comment is blank, call heap_delete, else heap_replace ***/
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if ((comment == NULL) || (strlen(comment) == 0)) {
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heap_delete(description, &searchtuple->t_self, NULL);
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} else {
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desctuple = heap_modifytuple(searchtuple, description, values, nulls, replaces);
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setheapoverride(true);
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heap_replace(description, &searchtuple->t_self, desctuple, NULL);
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setheapoverride(false);
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modified = TRUE;
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}
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} else {
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desctuple = heap_formtuple(tupDesc, values, nulls);
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heap_insert(description, desctuple);
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modified = TRUE;
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}
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/*** Complete the scan, update indices, if necessary ***/
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heap_endscan(scan);
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if (modified) {
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if (RelationGetForm(description)->relhasindex) {
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Relation idescs[Num_pg_description_indices];
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CatalogOpenIndices(Num_pg_description_indices, Name_pg_description_indices, idescs);
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CatalogIndexInsert(idescs, Num_pg_description_indices, description, desctuple);
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CatalogCloseIndices(Num_pg_description_indices, idescs);
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}
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pfree(desctuple);
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}
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heap_close(description, RowExclusiveLock);
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}
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/* --------------------------------
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* DeleteComments
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*
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* This routine is used to purge any comments
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* associated with the Oid handed to this routine,
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* regardless of the actual object type. It is
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* called, for example, when a relation is destroyed.
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* --------------------------------
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*/
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void
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DeleteComments(Oid oid)
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{
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Relation description;
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TupleDesc tupDesc;
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ScanKeyData entry;
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HeapScanDesc scan;
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HeapTuple searchtuple;
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description = heap_openr(DescriptionRelationName, RowExclusiveLock);
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tupDesc = description->rd_att;
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/*** Now, open pg_description and attempt to find the old tuple ***/
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ScanKeyEntryInitialize(&entry, 0x0, Anum_pg_description_objoid, F_OIDEQ,
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ObjectIdGetDatum(oid));
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scan = heap_beginscan(description, false, SnapshotNow, 1, &entry);
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searchtuple = heap_getnext(scan, 0);
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/*** If a previous tuple exists, delete it ***/
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if (HeapTupleIsValid(searchtuple)) {
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heap_delete(description, &searchtuple->t_self, NULL);
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}
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/*** Complete the scan, update indices, if necessary ***/
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heap_endscan(scan);
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heap_close(description, RowExclusiveLock);
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}
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/* --------------------------------
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* DeleteTypeTuple
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*
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@ -1471,6 +1608,13 @@ heap_destroy_with_catalog(char *relname)
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*/
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DeleteAttributeTuples(rel);
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/* ----------------
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* delete comments
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* ----------------
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*/
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DeleteComments(RelationGetRelid(rel));
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if (istemp)
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remove_temp_relation(rid);
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@ -8,7 +8,7 @@
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*
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*
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* IDENTIFICATION
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* $Header: /cvsroot/pgsql/src/backend/catalog/indexing.c,v 1.47 1999/09/30 10:31:42 wieck Exp $
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* $Header: /cvsroot/pgsql/src/backend/catalog/indexing.c,v 1.48 1999/10/15 01:49:39 momjian Exp $
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*
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*-------------------------------------------------------------------------
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*/
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@ -55,6 +55,9 @@ char *Name_pg_trigger_indices[Num_pg_trigger_indices] = {TriggerRelidIndex,
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TriggerConstrNameIndex,
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TriggerConstrRelidIndex};
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char *Name_pg_description_indices[Num_pg_description_indices] = {DescriptionObjIndex};
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static HeapTuple CatalogIndexFetchTuple(Relation heapRelation,
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Relation idesc,
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@ -7,7 +7,7 @@
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*
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*
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* IDENTIFICATION
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* $Header: /cvsroot/pgsql/src/backend/commands/Attic/creatinh.c,v 1.48 1999/10/03 23:55:27 tgl Exp $
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* $Header: /cvsroot/pgsql/src/backend/commands/Attic/creatinh.c,v 1.49 1999/10/15 01:49:39 momjian Exp $
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*
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*-------------------------------------------------------------------------
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*/
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@ -16,10 +16,12 @@
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#include "access/heapam.h"
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#include "catalog/catname.h"
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#include "catalog/indexing.h"
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#include "catalog/heap.h"
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#include "catalog/pg_inherits.h"
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#include "catalog/pg_ipl.h"
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#include "catalog/pg_type.h"
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#include "catalog/pg_description.h"
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#include "commands/creatinh.h"
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#include "utils/syscache.h"
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@ -232,6 +234,52 @@ TruncateRelation(char *name)
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heap_truncate(name);
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}
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/*------------------------------------------------------------------
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* CommentRelation --
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* Adds a comment to pg_description for the associated
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* relation or relation attribute.
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*
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* Note:
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* The comment is dropped on the relation or attribute if
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* the comment is an empty string.
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*------------------------------------------------------------------
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*/
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void
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CommentRelation(char *relname, char *attrname, char *comments)
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{
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Relation relation;
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HeapTuple attrtuple;
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Oid oid;
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/*** First ensure relname is valid ***/
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relation = heap_openr(relname, AccessShareLock);
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/*** Now, if an attribute was specified, fetch its oid, else use relation's oid ***/
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if (attrname != NULL) {
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attrtuple = SearchSysCacheTuple(ATTNAME, ObjectIdGetDatum(relation->rd_id),
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PointerGetDatum(attrname), 0, 0);
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if (!HeapTupleIsValid(attrtuple)) {
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elog(ERROR, "CommentRelation: attribute \"%s\" is not an attribute of relation \"%s\"",
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attrname, relname);
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}
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oid = attrtuple->t_data->t_oid;
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} else {
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oid = RelationGetRelid(relation);
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}
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/*** Call CreateComments() to create/drop the comments ***/
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CreateComments(oid, comments);
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/*** Now, close the heap relation ***/
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heap_close(relation, AccessShareLock);
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}
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/*
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* MergeAttributes
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* Returns new schema given initial schema and supers.
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@ -10,7 +10,7 @@
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*
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*
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* IDENTIFICATION
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* $Header: /cvsroot/pgsql/src/backend/parser/gram.y,v 2.108 1999/10/07 04:23:12 tgl Exp $
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* $Header: /cvsroot/pgsql/src/backend/parser/gram.y,v 2.109 1999/10/15 01:49:41 momjian Exp $
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*
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* HISTORY
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* AUTHOR DATE MAJOR EVENT
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@ -118,7 +118,7 @@ Oid param_type(int t); /* used in parse_expr.c */
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%type <node> stmt,
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AddAttrStmt, ClosePortalStmt,
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CopyStmt, CreateStmt, CreateAsStmt, CreateSeqStmt, DefineStmt, DestroyStmt,
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TruncateStmt,
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TruncateStmt, CommentStmt,
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ExtendStmt, FetchStmt, GrantStmt, CreateTrigStmt, DropTrigStmt,
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CreatePLangStmt, DropPLangStmt,
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IndexStmt, ListenStmt, UnlistenStmt, LockStmt, OptimizableStmt,
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@ -314,7 +314,7 @@ Oid param_type(int t); /* used in parse_expr.c */
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*/
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%token ABORT_TRANS, ACCESS, AFTER, AGGREGATE, ANALYZE,
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BACKWARD, BEFORE, BINARY,
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CACHE, CLUSTER, COPY, CREATEDB, CREATEUSER, CYCLE,
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CACHE, CLUSTER, COMMENT, COPY, CREATEDB, CREATEUSER, CYCLE,
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DATABASE, DELIMITERS, DO,
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EACH, ENCODING, EXCLUSIVE, EXPLAIN, EXTEND,
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FORWARD, FUNCTION, HANDLER,
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@ -402,6 +402,7 @@ stmt : AddAttrStmt
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| DefineStmt
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| DestroyStmt
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| TruncateStmt
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| CommentStmt
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| DropPLangStmt
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| DropTrigStmt
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| DropUserStmt
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@ -1539,6 +1540,32 @@ TruncateStmt: TRUNCATE TABLE relation_name
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}
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;
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/*****************************************************************************
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*
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* QUERY:
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* comment on [ table <relname> | column <relname>.<attribute> ]
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* is 'text'
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*
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*****************************************************************************/
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CommentStmt: COMMENT ON COLUMN relation_name '.' attr_name IS Sconst
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{
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CommentStmt *n = makeNode(CommentStmt);
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n->relname = $4;
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n->attrname = $6;
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n->comment = $8;
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$$ = (Node *) n;
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}
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| COMMENT ON TABLE relation_name IS Sconst
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{
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CommentStmt *n = makeNode(CommentStmt);
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n->relname = $4;
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n->attrname = NULL;
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n->comment = $6;
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$$ = (Node *) n;
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}
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;
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/*****************************************************************************
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*
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* QUERY:
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@ -5011,6 +5038,7 @@ ColId: IDENT { $$ = $1; }
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| BACKWARD { $$ = "backward"; }
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| BEFORE { $$ = "before"; }
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| CACHE { $$ = "cache"; }
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| COMMENT { $$ = "comment"; }
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| COMMITTED { $$ = "committed"; }
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| CONSTRAINTS { $$ = "constraints"; }
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| CREATEDB { $$ = "createdb"; }
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@ -5081,6 +5109,7 @@ ColId: IDENT { $$ = $1; }
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| TIMEZONE_HOUR { $$ = "timezone_hour"; }
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| TIMEZONE_MINUTE { $$ = "timezone_minute"; }
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| TRIGGER { $$ = "trigger"; }
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| TRUNCATE { $$ = "truncate"; }
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| TRUSTED { $$ = "trusted"; }
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| TYPE_P { $$ = "type"; }
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| VALID { $$ = "valid"; }
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|
|
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|
|
@ -7,7 +7,7 @@
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*
|
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*
|
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* IDENTIFICATION
|
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* $Header: /cvsroot/pgsql/src/backend/parser/keywords.c,v 1.62 1999/09/29 16:06:08 wieck Exp $
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* $Header: /cvsroot/pgsql/src/backend/parser/keywords.c,v 1.63 1999/10/15 01:49:41 momjian Exp $
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*
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*-------------------------------------------------------------------------
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*/
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@ -60,6 +60,7 @@ static ScanKeyword ScanKeywords[] = {
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{"coalesce", COALESCE},
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{"collate", COLLATE},
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{"column", COLUMN},
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{"comment", COMMENT},
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{"commit", COMMIT},
|
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{"committed", COMMITTED},
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{"constraint", CONSTRAINT},
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|
|
|
|||
|
|
@ -9,7 +9,7 @@
|
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*
|
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*
|
||||
* IDENTIFICATION
|
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* $Header: /cvsroot/pgsql/src/backend/tcop/utility.c,v 1.69 1999/09/30 01:12:36 tgl Exp $
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* $Header: /cvsroot/pgsql/src/backend/tcop/utility.c,v 1.70 1999/10/15 01:49:43 momjian Exp $
|
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*
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*-------------------------------------------------------------------------
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*/
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|
@ -233,6 +233,28 @@ ProcessUtility(Node *parsetree,
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}
|
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break;
|
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|
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case T_CommentStmt:
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{
|
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|
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CommentStmt *statement;
|
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|
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statement = ((CommentStmt *) parsetree);
|
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|
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PS_SET_STATUS(commandTag = "COMMENT");
|
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CHECK_IF_ABORTED();
|
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|
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#ifndef NO_SECURITY
|
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if (!pg_ownercheck(userName, statement->relname, RELNAME))
|
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elog(ERROR, "you do not own class \"%s\"", statement->relname);
|
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#endif
|
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|
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CommentRelation(statement->relname, statement->attrname,
|
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statement->comment);
|
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}
|
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break;
|
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|
||||
|
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|
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case T_CopyStmt:
|
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{
|
||||
CopyStmt *stmt = (CopyStmt *) parsetree;
|
||||
|
|
|
|||
|
|
@ -6,7 +6,7 @@
|
|||
*
|
||||
* Copyright (c) 1994, Regents of the University of California
|
||||
*
|
||||
* $Id: heap.h,v 1.22 1999/10/03 23:55:35 tgl Exp $
|
||||
* $Id: heap.h,v 1.23 1999/10/15 01:49:44 momjian Exp $
|
||||
*
|
||||
*-------------------------------------------------------------------------
|
||||
*/
|
||||
|
|
@ -32,6 +32,9 @@ extern void heap_destroy_with_catalog(char *relname);
|
|||
extern void heap_truncate(char *relname);
|
||||
extern void heap_destroy(Relation rel);
|
||||
|
||||
extern void CreateComments(Oid object, char *comments);
|
||||
extern void DeleteComments(Oid object);
|
||||
|
||||
extern void AddRelationRawConstraints(Relation rel,
|
||||
List *rawColDefaults,
|
||||
List *rawConstraints);
|
||||
|
|
|
|||
|
|
@ -6,7 +6,7 @@
|
|||
*
|
||||
* Copyright (c) 1994, Regents of the University of California
|
||||
*
|
||||
* $Id: pg_description.h,v 1.8 1999/02/13 23:21:09 momjian Exp $
|
||||
* $Id: pg_description.h,v 1.9 1999/10/15 01:49:44 momjian Exp $
|
||||
*
|
||||
* NOTES
|
||||
* the genbki.sh script reads this file and generates .bki
|
||||
|
|
@ -65,3 +65,4 @@ typedef FormData_pg_description *Form_pg_description;
|
|||
*/
|
||||
|
||||
#endif /* PG_DESCRIPTION_H */
|
||||
|
||||
|
|
|
|||
|
|
@ -6,7 +6,7 @@
|
|||
*
|
||||
* Copyright (c) 1994, Regents of the University of California
|
||||
*
|
||||
* $Id: creatinh.h,v 1.10 1999/09/23 17:03:16 momjian Exp $
|
||||
* $Id: creatinh.h,v 1.11 1999/10/15 01:49:46 momjian Exp $
|
||||
*
|
||||
*-------------------------------------------------------------------------
|
||||
*/
|
||||
|
|
@ -18,5 +18,6 @@
|
|||
extern void DefineRelation(CreateStmt *stmt, char relkind);
|
||||
extern void RemoveRelation(char *name);
|
||||
extern void TruncateRelation(char *name);
|
||||
extern void CommentRelation(char *name, char *attr, char *comment);
|
||||
|
||||
#endif /* CREATINH_H */
|
||||
|
|
|
|||
|
|
@ -6,7 +6,7 @@
|
|||
*
|
||||
* Copyright (c) 1994, Regents of the University of California
|
||||
*
|
||||
* $Id: nodes.h,v 1.54 1999/10/02 21:33:33 tgl Exp $
|
||||
* $Id: nodes.h,v 1.55 1999/10/15 01:49:47 momjian Exp $
|
||||
*
|
||||
*-------------------------------------------------------------------------
|
||||
*/
|
||||
|
|
@ -152,6 +152,7 @@ typedef enum NodeTag
|
|||
T_DefineStmt,
|
||||
T_DestroyStmt,
|
||||
T_TruncateStmt,
|
||||
T_CommentStmt,
|
||||
T_ExtendStmt,
|
||||
T_FetchStmt,
|
||||
T_IndexStmt,
|
||||
|
|
|
|||
|
|
@ -6,7 +6,7 @@
|
|||
*
|
||||
* Copyright (c) 1994, Regents of the University of California
|
||||
*
|
||||
* $Id: parsenodes.h,v 1.84 1999/10/07 04:23:17 tgl Exp $
|
||||
* $Id: parsenodes.h,v 1.85 1999/10/15 01:49:47 momjian Exp $
|
||||
*
|
||||
*-------------------------------------------------------------------------
|
||||
*/
|
||||
|
|
@ -309,6 +309,18 @@ typedef struct TruncateStmt
|
|||
NodeTag type;
|
||||
char *relName; /* relation to be truncated */
|
||||
} TruncateStmt;
|
||||
|
||||
/* ----------------------
|
||||
* Comment On Statement
|
||||
* ----------------------
|
||||
*/
|
||||
typedef struct CommentStmt
|
||||
{
|
||||
NodeTag type;
|
||||
char *relname; /* relation to create/drop comment */
|
||||
char *attrname; /* attribute to comment on */
|
||||
char *comment; /* the actual comment */
|
||||
} CommentStmt;
|
||||
|
||||
/* ----------------------
|
||||
* Extend Index Statement
|
||||
|
|
|
|||
|
|
@ -164,6 +164,7 @@ do
|
|||
-TDestReceiver \
|
||||
-TDestroyStmt \
|
||||
-TTruncateStmt \
|
||||
-TCommentStmt \
|
||||
-TDestroydbStmt \
|
||||
-TDisplay \
|
||||
-TDl_info \
|
||||
|
|
|
|||
Loading…
Reference in New Issue