*
*
* IDENTIFICATION
- * $Header: /cvsroot/pgsql/src/backend/commands/Attic/command.c,v 1.169 2002/03/31 06:26:30 tgl Exp $
+ * $Header: /cvsroot/pgsql/src/backend/commands/Attic/command.c,v 1.170 2002/04/01 04:35:38 tgl Exp $
*
* NOTES
* The PerformAddAttribute() code, like most of the relation
if (colDef->is_not_null)
elog(ERROR, "Adding NOT NULL columns is not implemented."
- "\n\tAdd the column, then use ALTER TABLE ADD CONSTRAINT.");
+ "\n\tAdd the column, then use ALTER TABLE ... SET NOT NULL.");
pgclass = heap_openr(RelationRelationName, RowExclusiveLock);
AlterTableCreateToastTable(myrelid, true);
}
+/*
+ * ALTER TABLE ALTER COLUMN DROP NOT NULL
+ */
+void
+AlterTableAlterColumnDropNotNull(Oid myrelid,
+ bool inh, const char *colName)
+{
+ Relation rel;
+ HeapTuple tuple;
+ AttrNumber attnum;
+ Relation attr_rel;
+ List *indexoidlist;
+ List *indexoidscan;
+
+ rel = heap_open(myrelid, AccessExclusiveLock);
+
+ if (rel->rd_rel->relkind != RELKIND_RELATION)
+ elog(ERROR, "ALTER TABLE: relation \"%s\" is not a table",
+ RelationGetRelationName(rel));
+
+ if (!allowSystemTableMods
+ && IsSystemRelationName(RelationGetRelationName(rel)))
+ elog(ERROR, "ALTER TABLE: relation \"%s\" is a system catalog",
+ RelationGetRelationName(rel));
+
+ if (!pg_class_ownercheck(myrelid, GetUserId()))
+ elog(ERROR, "ALTER TABLE: \"%s\": permission denied",
+ RelationGetRelationName(rel));
+
+ /*
+ * Propagate to children if desired
+ */
+ if (inh)
+ {
+ List *child,
+ *children;
+
+ /* this routine is actually in the planner */
+ children = find_all_inheritors(myrelid);
+
+ /*
+ * find_all_inheritors does the recursive search of the
+ * inheritance hierarchy, so all we have to do is process all of
+ * the relids in the list that it returns.
+ */
+ foreach(child, children)
+ {
+ Oid childrelid = lfirsti(child);
+
+ if (childrelid == myrelid)
+ continue;
+ AlterTableAlterColumnDropNotNull(childrelid,
+ false, colName);
+ }
+ }
+
+ /* -= now do the thing on this relation =- */
+
+ /*
+ * get the number of the attribute
+ */
+ tuple = SearchSysCache(ATTNAME,
+ ObjectIdGetDatum(myrelid),
+ PointerGetDatum(colName),
+ 0, 0);
+ if (!HeapTupleIsValid(tuple))
+ elog(ERROR, "ALTER TABLE: relation \"%s\" has no column \"%s\"",
+ RelationGetRelationName(rel), colName);
+
+ attnum = ((Form_pg_attribute) GETSTRUCT(tuple))->attnum;
+ ReleaseSysCache(tuple);
+
+ /* Prevent them from altering a system attribute */
+ if (attnum < 0)
+ elog(ERROR, "ALTER TABLE: Cannot alter system attribute \"%s\"",
+ colName);
+
+ /*
+ * Check that the attribute is not in a primary key
+ */
+
+ /* Loop over all indices on the relation */
+ indexoidlist = RelationGetIndexList(rel);
+
+ foreach(indexoidscan, indexoidlist)
+ {
+ Oid indexoid = lfirsti(indexoidscan);
+ HeapTuple indexTuple;
+ Form_pg_index indexStruct;
+ int i;
+
+ indexTuple = SearchSysCache(INDEXRELID,
+ ObjectIdGetDatum(indexoid),
+ 0, 0, 0);
+ if (!HeapTupleIsValid(indexTuple))
+ elog(ERROR, "ALTER TABLE: Index %u not found",
+ indexoid);
+ indexStruct = (Form_pg_index) GETSTRUCT(indexTuple);
+
+ /* If the index is not a primary key, skip the check */
+ if (indexStruct->indisprimary)
+ {
+ /*
+ * Loop over each attribute in the primary key and
+ * see if it matches the to-be-altered attribute
+ */
+ for (i = 0; i < INDEX_MAX_KEYS &&
+ indexStruct->indkey[i] != InvalidAttrNumber; i++)
+ {
+ if (indexStruct->indkey[i] == attnum)
+ elog(ERROR, "ALTER TABLE: Attribute \"%s\" is in a primary key", colName);
+ }
+ }
+
+ ReleaseSysCache(indexTuple);
+ }
+
+ freeList(indexoidlist);
+
+ /*
+ * Okay, actually perform the catalog change
+ */
+ attr_rel = heap_openr(AttributeRelationName, RowExclusiveLock);
+
+ tuple = SearchSysCacheCopy(ATTNAME,
+ ObjectIdGetDatum(myrelid),
+ PointerGetDatum(colName),
+ 0, 0);
+ if (!HeapTupleIsValid(tuple)) /* shouldn't happen */
+ elog(ERROR, "ALTER TABLE: relation \"%s\" has no column \"%s\"",
+ RelationGetRelationName(rel), colName);
+
+ ((Form_pg_attribute) GETSTRUCT(tuple))->attnotnull = FALSE;
+
+ simple_heap_update(attr_rel, &tuple->t_self, tuple);
+
+ /* keep the system catalog indices current */
+ if (RelationGetForm(attr_rel)->relhasindex)
+ {
+ Relation idescs[Num_pg_attr_indices];
+
+ CatalogOpenIndices(Num_pg_attr_indices, Name_pg_attr_indices, idescs);
+ CatalogIndexInsert(idescs, Num_pg_attr_indices, attr_rel, tuple);
+ CatalogCloseIndices(Num_pg_attr_indices, idescs);
+ }
+
+ heap_close(attr_rel, RowExclusiveLock);
+
+ heap_close(rel, NoLock);
+}
+
+/*
+ * ALTER TABLE ALTER COLUMN SET NOT NULL
+ */
+void
+AlterTableAlterColumnSetNotNull(Oid myrelid,
+ bool inh, const char *colName)
+{
+ Relation rel;
+ HeapTuple tuple;
+ AttrNumber attnum;
+ Relation attr_rel;
+ HeapScanDesc scan;
+ TupleDesc tupdesc;
+
+ rel = heap_open(myrelid, AccessExclusiveLock);
+
+ if (rel->rd_rel->relkind != RELKIND_RELATION)
+ elog(ERROR, "ALTER TABLE: relation \"%s\" is not a table",
+ RelationGetRelationName(rel));
+
+ if (!allowSystemTableMods
+ && IsSystemRelationName(RelationGetRelationName(rel)))
+ elog(ERROR, "ALTER TABLE: relation \"%s\" is a system catalog",
+ RelationGetRelationName(rel));
+
+ if (!pg_class_ownercheck(myrelid, GetUserId()))
+ elog(ERROR, "ALTER TABLE: \"%s\": permission denied",
+ RelationGetRelationName(rel));
+
+ /*
+ * Propagate to children if desired
+ */
+ if (inh)
+ {
+ List *child,
+ *children;
+
+ /* this routine is actually in the planner */
+ children = find_all_inheritors(myrelid);
+
+ /*
+ * find_all_inheritors does the recursive search of the
+ * inheritance hierarchy, so all we have to do is process all of
+ * the relids in the list that it returns.
+ */
+ foreach(child, children)
+ {
+ Oid childrelid = lfirsti(child);
+
+ if (childrelid == myrelid)
+ continue;
+ AlterTableAlterColumnSetNotNull(childrelid,
+ false, colName);
+ }
+ }
+
+ /* -= now do the thing on this relation =- */
+
+ /*
+ * get the number of the attribute
+ */
+ tuple = SearchSysCache(ATTNAME,
+ ObjectIdGetDatum(myrelid),
+ PointerGetDatum(colName),
+ 0, 0);
+ if (!HeapTupleIsValid(tuple))
+ elog(ERROR, "ALTER TABLE: relation \"%s\" has no column \"%s\"",
+ RelationGetRelationName(rel), colName);
+
+ attnum = ((Form_pg_attribute) GETSTRUCT(tuple))->attnum;
+ ReleaseSysCache(tuple);
+
+ /* Prevent them from altering a system attribute */
+ if (attnum < 0)
+ elog(ERROR, "ALTER TABLE: Cannot alter system attribute \"%s\"",
+ colName);
+
+ /*
+ * Perform a scan to ensure that there are no NULL
+ * values already in the relation
+ */
+ tupdesc = RelationGetDescr(rel);
+
+ scan = heap_beginscan(rel, false, SnapshotNow, 0, NULL);
+
+ while (HeapTupleIsValid(tuple = heap_getnext(scan, 0)))
+ {
+ Datum d;
+ bool isnull;
+
+ d = heap_getattr(tuple, attnum, tupdesc, &isnull);
+
+ if (isnull)
+ elog(ERROR, "ALTER TABLE: Attribute \"%s\" contains NULL values",
+ colName);
+ }
+
+ heap_endscan(scan);
+
+ /*
+ * Okay, actually perform the catalog change
+ */
+ attr_rel = heap_openr(AttributeRelationName, RowExclusiveLock);
+
+ tuple = SearchSysCacheCopy(ATTNAME,
+ ObjectIdGetDatum(myrelid),
+ PointerGetDatum(colName),
+ 0, 0);
+ if (!HeapTupleIsValid(tuple)) /* shouldn't happen */
+ elog(ERROR, "ALTER TABLE: relation \"%s\" has no column \"%s\"",
+ RelationGetRelationName(rel), colName);
+
+ ((Form_pg_attribute) GETSTRUCT(tuple))->attnotnull = TRUE;
+
+ simple_heap_update(attr_rel, &tuple->t_self, tuple);
+
+ /* keep the system catalog indices current */
+ if (RelationGetForm(attr_rel)->relhasindex)
+ {
+ Relation idescs[Num_pg_attr_indices];
+
+ CatalogOpenIndices(Num_pg_attr_indices, Name_pg_attr_indices, idescs);
+ CatalogIndexInsert(idescs, Num_pg_attr_indices, attr_rel, tuple);
+ CatalogCloseIndices(Num_pg_attr_indices, idescs);
+ }
+
+ heap_close(attr_rel, RowExclusiveLock);
+
+ heap_close(rel, NoLock);
+}
+
/*
* ALTER TABLE ALTER COLUMN SET/DROP DEFAULT
{
Relation rel;
HeapTuple tuple;
- int16 attnum;
+ AttrNumber attnum;
rel = heap_open(myrelid, AccessExclusiveLock);
RelationGetRelationName(rel));
if (!pg_class_ownercheck(myrelid, GetUserId()))
- elog(ERROR, "ALTER TABLE: \"%s\" permission denied",
+ elog(ERROR, "ALTER TABLE: \"%s\": permission denied",
RelationGetRelationName(rel));
/*
{
/* DROP DEFAULT */
Relation attr_rel;
- ScanKeyData scankeys[3];
- HeapScanDesc scan;
+ /* Fix the pg_attribute row */
attr_rel = heap_openr(AttributeRelationName, RowExclusiveLock);
- ScanKeyEntryInitialize(&scankeys[0], 0x0,
- Anum_pg_attribute_attrelid, F_OIDEQ,
- ObjectIdGetDatum(myrelid));
- ScanKeyEntryInitialize(&scankeys[1], 0x0,
- Anum_pg_attribute_attnum, F_INT2EQ,
- Int16GetDatum(attnum));
- ScanKeyEntryInitialize(&scankeys[2], 0x0,
- Anum_pg_attribute_atthasdef, F_BOOLEQ,
- BoolGetDatum(true));
-
- scan = heap_beginscan(attr_rel, false, SnapshotNow, 3, scankeys);
- AssertState(scan != NULL);
-
- if (HeapTupleIsValid(tuple = heap_getnext(scan, 0)))
- {
- HeapTuple newtuple;
- Relation irelations[Num_pg_attr_indices];
- /* update to false */
- newtuple = heap_copytuple(tuple);
- ((Form_pg_attribute) GETSTRUCT(newtuple))->atthasdef = FALSE;
- simple_heap_update(attr_rel, &tuple->t_self, newtuple);
+ tuple = SearchSysCacheCopy(ATTNAME,
+ ObjectIdGetDatum(myrelid),
+ PointerGetDatum(colName),
+ 0, 0);
+ if (!HeapTupleIsValid(tuple)) /* shouldn't happen */
+ elog(ERROR, "ALTER TABLE: relation \"%s\" has no column \"%s\"",
+ RelationGetRelationName(rel), colName);
- /* keep the system catalog indices current */
- CatalogOpenIndices(Num_pg_attr_indices, Name_pg_attr_indices, irelations);
- CatalogIndexInsert(irelations, Num_pg_attr_indices, attr_rel, newtuple);
- CatalogCloseIndices(Num_pg_attr_indices, irelations);
+ ((Form_pg_attribute) GETSTRUCT(tuple))->atthasdef = FALSE;
- /* get rid of actual default definition */
- drop_default(myrelid, attnum);
+ simple_heap_update(attr_rel, &tuple->t_self, tuple);
+
+ /* keep the system catalog indices current */
+ if (RelationGetForm(attr_rel)->relhasindex)
+ {
+ Relation idescs[Num_pg_attr_indices];
+
+ CatalogOpenIndices(Num_pg_attr_indices, Name_pg_attr_indices, idescs);
+ CatalogIndexInsert(idescs, Num_pg_attr_indices, attr_rel, tuple);
+ CatalogCloseIndices(Num_pg_attr_indices, idescs);
}
- heap_endscan(scan);
- heap_close(attr_rel, NoLock);
+ heap_close(attr_rel, RowExclusiveLock);
+
+ /* get rid of actual default definition in pg_attrdef */
+ drop_default(myrelid, attnum);
}
heap_close(rel, NoLock);
RelationGetRelationName(rel));
if (!pg_class_ownercheck(myrelid, GetUserId()))
- elog(ERROR, "ALTER TABLE: \"%s\" permission denied",
+ elog(ERROR, "ALTER TABLE: \"%s\": permission denied",
RelationGetRelationName(rel));
/*
RelationGetRelationName(rel));
if (!allowSystemTableMods
- && IsSystemRelationName(RelationGetRelationName(rel))
+ && IsSystemRelationName(RelationGetRelationName(rel)))
elog(ERROR, "ALTER TABLE: relation \"%s\" is a system catalog",
RelationGetRelationName(rel));
* normally, only the owner of a class can change its schema.
*/
if (!pg_class_ownercheck(myrelid, GetUserId()))
- elog(ERROR, "ALTER TABLE: permission denied");
+ elog(ERROR, "ALTER TABLE: \"%s\": permission denied",
+ RelationGetRelationName(rel));
heap_close(rel, NoLock); /* close rel but keep lock! */
RelationGetRelationName(rel));
if (!pg_class_ownercheck(relOid, GetUserId()))
- elog(ERROR, "ALTER TABLE: permission denied");
+ elog(ERROR, "ALTER TABLE: \"%s\": permission denied",
+ RelationGetRelationName(rel));
/*
* lock the pg_class tuple for update (is that really needed?)
insert into atacc1 (test2, test) values (1, NULL);
ERROR: ExecAppend: Fail to add null value in not null attribute test
drop table atacc1;
+-- alter table / alter column [set/drop] not null tests
+-- try altering system catalogs, should fail
+alter table pg_class alter column relname drop not null;
+ERROR: ALTER TABLE: relation "pg_class" is a system catalog
+alter table pg_class alter relname set not null;
+ERROR: ALTER TABLE: relation "pg_class" is a system catalog
+-- try altering non-existent table, should fail
+alter table foo alter column bar set not null;
+ERROR: Relation "foo" does not exist
+alter table foo alter column bar drop not null;
+ERROR: Relation "foo" does not exist
+-- test setting columns to null and not null and vice versa
+-- test checking for null values and primary key
+create table atacc1 (test int not null);
+alter table atacc1 add constraint "atacc1_pkey" primary key (test);
+NOTICE: ALTER TABLE / ADD PRIMARY KEY will create implicit index 'atacc1_pkey' for table 'atacc1'
+alter table atacc1 alter column test drop not null;
+ERROR: ALTER TABLE: Attribute "test" is in a primary key
+drop index atacc1_pkey;
+alter table atacc1 alter column test drop not null;
+insert into atacc1 values (null);
+alter table atacc1 alter test set not null;
+ERROR: ALTER TABLE: Attribute "test" contains NULL values
+delete from atacc1;
+alter table atacc1 alter test set not null;
+-- try altering a non-existent column, should fail
+alter table atacc1 alter bar set not null;
+ERROR: ALTER TABLE: relation "atacc1" has no column "bar"
+alter table atacc1 alter bar drop not null;
+ERROR: ALTER TABLE: relation "atacc1" has no column "bar"
+-- try altering the oid column, should fail
+alter table atacc1 alter oid set not null;
+ERROR: ALTER TABLE: Cannot alter system attribute "oid"
+alter table atacc1 alter oid drop not null;
+ERROR: ALTER TABLE: Cannot alter system attribute "oid"
+-- try creating a view and altering that, should fail
+create view myview as select * from atacc1;
+alter table myview alter column test drop not null;
+ERROR: ALTER TABLE: relation "myview" is not a table
+alter table myview alter column test set not null;
+ERROR: ALTER TABLE: relation "myview" is not a table
+drop view myview;
+drop table atacc1;
+-- test inheritance
+create table parent (a int);
+create table child (b varchar(255)) inherits (parent);
+alter table parent alter a set not null;
+insert into parent values (NULL);
+ERROR: ExecAppend: Fail to add null value in not null attribute a
+insert into child (a, b) values (NULL, 'foo');
+ERROR: ExecAppend: Fail to add null value in not null attribute a
+alter table parent alter a drop not null;
+insert into parent values (NULL);
+insert into child (a, b) values (NULL, 'foo');
+alter table only parent alter a set not null;
+ERROR: ALTER TABLE: Attribute "a" contains NULL values
+alter table child alter a set not null;
+ERROR: ALTER TABLE: Attribute "a" contains NULL values
+delete from parent;
+alter table only parent alter a set not null;
+insert into parent values (NULL);
+ERROR: ExecAppend: Fail to add null value in not null attribute a
+alter table child alter a set not null;
+insert into child (a, b) values (NULL, 'foo');
+ERROR: ExecAppend: Fail to add null value in not null attribute a
+delete from child;
+alter table child alter a set not null;
+insert into child (a, b) values (NULL, 'foo');
+ERROR: ExecAppend: Fail to add null value in not null attribute a
+drop table child;
+drop table parent;
projects / users / rhaas / postgres.git / commitdiff