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CREATE LIKE INCLUDING COMMENTS and STORAGE, and INCLUDING ALL shortcut. Itagaki Takahiro.

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This commit is contained in:
Andrew Dunstan
2009-10-12 19:49:24 +00:00
parent 0adaf4cb31
commit faa1afc6c1
15 changed files with 564 additions and 117 deletions
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105
src/backend/commands/comment.c
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@@ -7,7 +7,7 @@
* Copyright (c) 1996-2009, PostgreSQL Global Development Group
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/commands/comment.c,v 1.107 2009/06/11 14:48:55 momjian Exp $
* $PostgreSQL: pgsql/src/backend/commands/comment.c,v 1.108 2009/10/12 19:49:24 adunstan Exp $
*
*-------------------------------------------------------------------------
*/
@@ -462,6 +462,61 @@ DeleteSharedComments(Oid oid, Oid classoid)
heap_close(shdescription, RowExclusiveLock);
}
/*
* GetComment -- get the comment for an object, or null if not found.
*/
char *
GetComment(Oid oid, Oid classoid, int32 subid)
{
Relation description;
ScanKeyData skey[3];
SysScanDesc sd;
TupleDesc tupdesc;
HeapTuple tuple;
char *comment;
/* Use the index to search for a matching old tuple */
ScanKeyInit(&skey[0],
Anum_pg_description_objoid,
BTEqualStrategyNumber, F_OIDEQ,
ObjectIdGetDatum(oid));
ScanKeyInit(&skey[1],
Anum_pg_description_classoid,
BTEqualStrategyNumber, F_OIDEQ,
ObjectIdGetDatum(classoid));
ScanKeyInit(&skey[2],
Anum_pg_description_objsubid,
BTEqualStrategyNumber, F_INT4EQ,
Int32GetDatum(subid));
description = heap_open(DescriptionRelationId, AccessShareLock);
tupdesc = RelationGetDescr(description);
sd = systable_beginscan(description, DescriptionObjIndexId, true,
SnapshotNow, 3, skey);
comment = NULL;
while ((tuple = systable_getnext(sd)) != NULL)
{
Datum value;
bool isnull;
/* Found the tuple, get description field */
value = heap_getattr(tuple, Anum_pg_description_description, tupdesc, &isnull);
if (!isnull)
comment = TextDatumGetCString(value);
break; /* Assume there can be only one match */
}
systable_endscan(sd);
/* Done */
heap_close(description, AccessShareLock);
return comment;
}
/*
* CommentRelation --
*
@@ -1064,12 +1119,8 @@ CommentConstraint(List *qualname, char *comment)
List *relName;
char *conName;
RangeVar *rel;
Relation pg_constraint,
relation;
HeapTuple tuple;
SysScanDesc scan;
ScanKeyData skey[1];
Oid conOid = InvalidOid;
Relation relation;
Oid conOid;
/* Separate relname and constraint name */
nnames = list_length(qualname);
@@ -1088,50 +1139,12 @@ CommentConstraint(List *qualname, char *comment)
aclcheck_error(ACLCHECK_NOT_OWNER, ACL_KIND_CLASS,
RelationGetRelationName(relation));
/*
* Fetch the constraint tuple from pg_constraint. There may be more than
* one match, because constraints are not required to have unique names;
* if so, error out.
*/
pg_constraint = heap_open(ConstraintRelationId, AccessShareLock);
ScanKeyInit(&skey[0],
Anum_pg_constraint_conrelid,
BTEqualStrategyNumber, F_OIDEQ,
ObjectIdGetDatum(RelationGetRelid(relation)));
scan = systable_beginscan(pg_constraint, ConstraintRelidIndexId, true,
SnapshotNow, 1, skey);
while (HeapTupleIsValid(tuple = systable_getnext(scan)))
{
Form_pg_constraint con = (Form_pg_constraint) GETSTRUCT(tuple);
if (strcmp(NameStr(con->conname), conName) == 0)
{
if (OidIsValid(conOid))
ereport(ERROR,
(errcode(ERRCODE_DUPLICATE_OBJECT),
errmsg("table \"%s\" has multiple constraints named \"%s\"",
RelationGetRelationName(relation), conName)));
conOid = HeapTupleGetOid(tuple);
}
}
systable_endscan(scan);
/* If no constraint exists for the relation specified, notify user */
if (!OidIsValid(conOid))
ereport(ERROR,
(errcode(ERRCODE_UNDEFINED_OBJECT),
errmsg("constraint \"%s\" for table \"%s\" does not exist",
conName, RelationGetRelationName(relation))));
conOid = GetConstraintByName(RelationGetRelid(relation), conName);
/* Call CreateComments() to create/drop the comments */
CreateComments(conOid, ConstraintRelationId, 0, comment);
/* Done, but hold lock on relation */
heap_close(pg_constraint, AccessShareLock);
heap_close(relation, NoLock);
}