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Allow only some columns of a view to be auto-updateable.

Browse Source 
Previously, unless all columns were auto-updateable, we wouldn't
inserts, updates, or deletes, or at least not without a rule or trigger;
now, we'll allow inserts and updates that target only the auto-updateable
columns, and deletes even if there are no auto-updateable columns at
all provided the view definition is otherwise suitable.

Dean Rasheed, reviewed by Marko Tiikkaja
This commit is contained in:
Robert Haas 2013-10-18 10:35:36 -04:00
parent 523beaa11b
commit cab5dc5daf
8 changed files with 701 additions and 178 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

39
doc/src/sgml/ref/create_view.sgml
View File

@ -319,16 +319,8 @@ CREATE VIEW vista AS SELECT text 'Hello World' AS hello;
<listitem>
<para>
All columns in the view's select list must be simple references to
columns of the underlying relation. They cannot be expressions,
literals or functions. System columns cannot be referenced, either.
</para>
</listitem>
<listitem>
<para>
No column of the underlying relation can appear more than once in
the view's select list.
The view's select list must not contain any aggregates, window functions
or set-returning functions.
</para>
</listitem>
@ -340,6 +332,14 @@ CREATE VIEW vista AS SELECT text 'Hello World' AS hello;
</itemizedlist>
</para>
<para>
An automatically updatable view may contain a mix of updatable and
non-updatable columns. A column is updatable if it is a simple reference
to an updatable column of the underlying base relation; otherwise the
column is read-only, and an error will be raised if an <command>INSERT</>
or <command>UPDATE</> statement attempts to assign a value to it.
</para>
<para>
If the view is automatically updatable the system will convert any
<command>INSERT</>, <command>UPDATE</> or <command>DELETE</> statement
@ -434,6 +434,25 @@ CREATE VIEW pg_comedies AS
<literal>classification</> of new rows.
</para>
<para>
Create a view with a mix of updatable and non-updatable columns:
<programlisting>
CREATE VIEW comedies AS
SELECT f.*,
country_code_to_name(f.country_code) AS country,
(SELECT avg(r.rating)
FROM user_ratings r
WHERE r.film_id = f.id) AS avg_rating
FROM films f
WHERE f.kind = 'Comedy';
</programlisting>
This view will support <command>INSERT</>, <command>UPDATE</> and
<command>DELETE</>. All the columns from the <literal>films</> table will
be updatable, whereas the computed columns <literal>country</> and
<literal>avg_rating</> will be read-only.
</para>
<para>
Create a recursive view consisting of the numbers from 1 to 100:
<programlisting>

3
src/backend/commands/tablecmds.c
View File

@ -8806,7 +8806,8 @@ ATExecSetRelOptions(Relation rel, List *defList, AlterTableType operation,
if (check_option)
{
const char *view_updatable_error =
view_query_is_auto_updatable(view_query, security_barrier);
view_query_is_auto_updatable(view_query,
security_barrier, true);
if (view_updatable_error)
ereport(ERROR,

2
src/backend/commands/view.c
View File

@ -469,7 +469,7 @@ DefineView(ViewStmt *stmt, const char *queryString)
if (check_option)
{
const char *view_updatable_error =
view_query_is_auto_updatable(viewParse, security_barrier);
view_query_is_auto_updatable(viewParse, security_barrier, true);
if (view_updatable_error)
ereport(ERROR,

408
src/backend/rewrite/rewriteHandler.c
View File

@ -61,6 +61,8 @@ static List *matchLocks(CmdType event, RuleLock *rulelocks,
int varno, Query *parsetree);
static Query *fireRIRrules(Query *parsetree, List *activeRIRs,
bool forUpdatePushedDown);
static bool view_has_instead_trigger(Relation view, CmdType event);
static Bitmapset *adjust_view_column_set(Bitmapset *cols, List *targetlist);
/*
@ -616,12 +618,18 @@ adjustJoinTreeList(Query *parsetree, bool removert, int rt_index)
* and UPDATE, replace explicit DEFAULT specifications with column default
* expressions.
*
* 2. For an UPDATE on a view, add tlist entries for any unassigned-to
* attributes, assigning them their old values. These will later get
* expanded to the output values of the view. (This is equivalent to what
* the planner's expand_targetlist() will do for UPDATE on a regular table,
* but it's more convenient to do it here while we still have easy access
* to the view's original RT index.)
* 2. For an UPDATE on a trigger-updatable view, add tlist entries for any
* unassigned-to attributes, assigning them their old values. These will
* later get expanded to the output values of the view. (This is equivalent
* to what the planner's expand_targetlist() will do for UPDATE on a regular
* table, but it's more convenient to do it here while we still have easy
* access to the view's original RT index.) This is only necessary for
* trigger-updatable views, for which the view remains the result relation of
* the query. For auto-updatable views we must not do this, since it might
* add assignments to non-updatable view columns. For rule-updatable views it
* is unnecessary extra work, since the query will be rewritten with a
* different result relation which will be processed when we recurse via
* RewriteQuery.
*
* 3. Merge multiple entries for the same target attribute, or declare error
* if we can't. Multiple entries are only allowed for INSERT/UPDATE of
@ -783,11 +791,12 @@ rewriteTargetListIU(Query *parsetree, Relation target_relation,
}
/*
* For an UPDATE on a view, provide a dummy entry whenever there is no
* explicit assignment.
* For an UPDATE on a trigger-updatable view, provide a dummy entry
* whenever there is no explicit assignment.
*/
if (new_tle == NULL && commandType == CMD_UPDATE &&
target_relation->rd_rel->relkind == RELKIND_VIEW)
target_relation->rd_rel->relkind == RELKIND_VIEW &&
view_has_instead_trigger(target_relation, CMD_UPDATE))
{
Node *new_expr;
@ -1880,7 +1889,8 @@ get_view_query(Relation view)
* view_has_instead_trigger - does view have an INSTEAD OF trigger for event?
*
* If it does, we don't want to treat it as auto-updatable. This test can't
* be folded into view_is_auto_updatable because it's not an error condition.
* be folded into view_query_is_auto_updatable because it's not an error
* condition.
*/
static bool
view_has_instead_trigger(Relation view, CmdType event)
@ -1910,55 +1920,64 @@ view_has_instead_trigger(Relation view, CmdType event)
/*
* view_is_auto_updatable -
* Retrive the view definition and options and then determine if the view
* can be auto-updated by calling view_query_is_auto_updatable(). Returns
* NULL or a message string giving the reason the view is not auto
* updateable. See view_query_is_auto_updatable() for details.
* view_col_is_auto_updatable - test whether the specified column of a view
* is auto-updatable. Returns NULL (if the column can be updated) or a message
* string giving the reason that it cannot be.
*
* The only view option which affects if a view can be auto-updated, today,
* is the security_barrier option. If other options are added later, they
* will also need to be handled here.
*
* Caller must have verified that the relation is a view!
*
* Note that the checks performed here are local to this view. We do not
* check whether the view's underlying base relation is updatable; that
* will be dealt with in later, recursive processing.
*
* Also note that we don't check for INSTEAD triggers or rules here; those
* also prevent auto-update, but they must be checked for by the caller.
* Note that the checks performed here are local to this view. We do not check
* whether the referenced column of the underlying base relation is updatable.
*/
const char *
view_is_auto_updatable(Relation view)
static const char *
view_col_is_auto_updatable(RangeTblRef *rtr, TargetEntry *tle)
{
Query *viewquery = get_view_query(view);
bool security_barrier = RelationIsSecurityView(view);
Var *var = (Var *) tle->expr;
return view_query_is_auto_updatable(viewquery, security_barrier);
/*
* For now, the only updatable columns we support are those that are Vars
* referring to user columns of the underlying base relation.
*
* The view targetlist may contain resjunk columns (e.g., a view defined
* like "SELECT * FROM t ORDER BY a+b" is auto-updatable) but such columns
* are not auto-updatable, and in fact should never appear in the outer
* query's targetlist.
*/
if (tle->resjunk)
return gettext_noop("Junk view columns are not updatable.");
if (!IsA(var, Var) ||
var->varno != rtr->rtindex ||
var->varlevelsup != 0)
return gettext_noop("View columns that are not columns of their base relation are not updatable.");
if (var->varattno < 0)
return gettext_noop("View columns that refer to system columns are not updatable.");
if (var->varattno == 0)
return gettext_noop("View columns that return whole-row references are not updatable.");
return NULL; /* the view column is updatable */
}
/*
* view_query_is_auto_updatable -
* Test if the specified view definition can be automatically updated, given
* the view's options (currently only security_barrier affects a view's
* auto-updatable status).
* view_query_is_auto_updatable - test whether the specified view definition
* represents an auto-updatable view. Returns NULL (if the view can be updated)
* or a message string giving the reason that it cannot be.
*
* This will either return NULL (if the view can be updated) or a message
* string giving the reason that it cannot be.
* If check_cols is true, the view is required to have at least one updatable
* column (necessary for INSERT/UPDATE). Otherwise the view's columns are not
* checked for updatability. See also view_cols_are_auto_updatable.
*
* Note that the checks performed here are only based on the view
* definition. We do not check whether any base relations referred to by
* the view are updatable.
* Note that the checks performed here are only based on the view definition.
* We do not check whether any base relations referred to by the view are
* updatable.
*/
const char *
view_query_is_auto_updatable(Query *viewquery, bool security_barrier)
view_query_is_auto_updatable(Query *viewquery, bool security_barrier,
bool check_cols)
{
RangeTblRef *rtr;
RangeTblEntry *base_rte;
Bitmapset *bms;
ListCell *cell;
/*----------
* Check if the view is simply updatable. According to SQL-92 this means:
@ -1975,11 +1994,18 @@ view_query_is_auto_updatable(Query *viewquery, bool security_barrier)
* arise in Postgres, since any such sub-query will not see any updates
* executed by the outer query anyway, thanks to MVCC snapshotting.)
*
* We also relax the second restriction by supporting part of SQL:1999
* feature T111, which allows for a mix of updatable and non-updatable
* columns, provided that an INSERT or UPDATE doesn't attempt to assign to
* a non-updatable column.
*
* In addition we impose these constraints, involving features that are
* not part of SQL-92:
* - No CTEs (WITH clauses).
* - No OFFSET or LIMIT clauses (this matches a SQL:2008 restriction).
* - No system columns (including whole-row references) in the tlist.
* - No window functions in the tlist.
* - No set-returning functions in the tlist.
*
* Note that we do these checks without recursively expanding the view.
* If the base relation is a view, we'll recursively deal with it later.
@ -2003,6 +2029,24 @@ view_query_is_auto_updatable(Query *viewquery, bool security_barrier)
if (viewquery->limitOffset != NULL || viewquery->limitCount != NULL)
return gettext_noop("Views containing LIMIT or OFFSET are not automatically updatable.");
/*
* We must not allow window functions or set returning functions in the
* targetlist. Otherwise we might end up inserting them into the quals of
* the main query. We must also check for aggregates in the targetlist in
* case they appear without a GROUP BY.
*
* These restrictions ensure that each row of the view corresponds to a
* unique row in the underlying base relation.
*/
if (viewquery->hasAggs)
return gettext_noop("Views that return aggregate functions are not automatically updatable");
if (viewquery->hasWindowFuncs)
return gettext_noop("Views that return window functions are not automatically updatable");
if (expression_returns_set((Node *) viewquery->targetList))
return gettext_noop("Views that return set-returning functions are not automatically updatable.");
/*
* For now, we also don't support security-barrier views, because of the
* difficulty of keeping upper-level qual expressions away from
@ -2030,42 +2074,104 @@ view_query_is_auto_updatable(Query *viewquery, bool security_barrier)
return gettext_noop("Views that do not select from a single table or view are not automatically updatable.");
/*
* The view's targetlist entries should all be Vars referring to user
* columns of the base relation, and no two should refer to the same
* column.
*
* Note however that we should ignore resjunk entries. This proviso is
* relevant because ORDER BY is not disallowed, and we shouldn't reject a
* view defined like "SELECT * FROM t ORDER BY a+b".
* Check that the view has at least one updatable column. This is required
* for INSERT/UPDATE but not for DELETE.
*/
bms = NULL;
if (check_cols)
{
ListCell *cell;
bool found;
found = false;
foreach(cell, viewquery->targetList)
{
TargetEntry *tle = (TargetEntry *) lfirst(cell);
if (view_col_is_auto_updatable(rtr, tle) == NULL)
{
found = true;
break;
}
}
if (!found)
return gettext_noop("Views that have no updatable columns are not automatically updatable.");
}
return NULL; /* the view is updatable */
}
/*
* view_cols_are_auto_updatable - test whether all of the required columns of
* an auto-updatable view are actually updatable. Returns NULL (if all the
* required columns can be updated) or a message string giving the reason that
* they cannot be.
*
* This should be used for INSERT/UPDATE to ensure that we don't attempt to
* assign to any non-updatable columns.
*
* Additionally it may be used to retrieve the set of updatable columns in the
* view, or if one or more of the required columns is not updatable, the name
* of the first offending non-updatable column.
*
* The caller must have already verified that this is an auto-updatable view
* using view_query_is_auto_updatable.
*
* Note that the checks performed here are only based on the view definition.
* We do not check whether the referenced columns of the base relation are
* updatable.
*/
static const char *
view_cols_are_auto_updatable(Query *viewquery,
Bitmapset *required_cols,
Bitmapset **updatable_cols,
char **non_updatable_col)
{
RangeTblRef *rtr;
AttrNumber col;
ListCell *cell;
/*
* The caller should have verified that this view is auto-updatable and
* so there should be a single base relation.
*/
Assert(list_length(viewquery->jointree->fromlist) == 1);
rtr = (RangeTblRef *) linitial(viewquery->jointree->fromlist);
Assert(IsA(rtr, RangeTblRef));
/* Initialize the optional return values */
if (updatable_cols != NULL)
*updatable_cols = NULL;
if (non_updatable_col != NULL)
*non_updatable_col = NULL;
/* Test each view column for updatability */
col = -FirstLowInvalidHeapAttributeNumber;
foreach(cell, viewquery->targetList)
{
TargetEntry *tle = (TargetEntry *) lfirst(cell);
Var *var = (Var *) tle->expr;
const char *col_update_detail;
if (tle->resjunk)
continue;
col++;
col_update_detail = view_col_is_auto_updatable(rtr, tle);
if (!IsA(var, Var) ||
var->varno != rtr->rtindex ||
var->varlevelsup != 0)
return gettext_noop("Views that return columns that are not columns of their base relation are not automatically updatable.");
if (var->varattno < 0)
return gettext_noop("Views that return system columns are not automatically updatable.");
if (var->varattno == 0)
return gettext_noop("Views that return whole-row references are not automatically updatable.");
if (bms_is_member(var->varattno, bms))
return gettext_noop("Views that return the same column more than once are not automatically updatable.");
bms = bms_add_member(bms, var->varattno);
if (col_update_detail == NULL)
{
/* The column is updatable */
if (updatable_cols != NULL)
*updatable_cols = bms_add_member(*updatable_cols, col);
}
else if (bms_is_member(col, required_cols))
{
/* The required column is not updatable */
if (non_updatable_col != NULL)
*non_updatable_col = tle->resname;
return col_update_detail;
}
}
bms_free(bms); /* just for cleanliness */
return NULL; /* the view is simply updatable */
return NULL; /* all the required view columns are updatable */
}
@ -2073,6 +2179,12 @@ view_query_is_auto_updatable(Query *viewquery, bool security_barrier)
* relation_is_updatable - determine which update events the specified
* relation supports.
*
* Note that views may contain a mix of updatable and non-updatable columns.
* For a view to support INSERT/UPDATE it must have at least one updatable
* column, but there is no such restriction for DELETE. If include_cols is
* non-NULL, then only the specified columns are considered when testing for
* updatability.
*
* This is used for the information_schema views, which have separate concepts
* of "updatable" and "trigger updatable". A relation is "updatable" if it
* can be updated without the need for triggers (either because it has a
@ -2090,7 +2202,9 @@ view_query_is_auto_updatable(Query *viewquery, bool security_barrier)
* so that we can test for UPDATE plus DELETE support in a single call.)
*/
int
relation_is_updatable(Oid reloid, bool include_triggers)
relation_is_updatable(Oid reloid,
bool include_triggers,
Bitmapset *include_cols)
{
int events = 0;
Relation rel;
@ -2185,32 +2299,57 @@ relation_is_updatable(Oid reloid, bool include_triggers)
}
/* Check if this is an automatically updatable view */
if (rel->rd_rel->relkind == RELKIND_VIEW &&
view_is_auto_updatable(rel) == NULL)
if (rel->rd_rel->relkind == RELKIND_VIEW)
{
Query *viewquery;
RangeTblRef *rtr;
RangeTblEntry *base_rte;
Oid baseoid;
Query *viewquery = get_view_query(rel);
/* The base relation must also be updatable */
viewquery = get_view_query(rel);
rtr = (RangeTblRef *) linitial(viewquery->jointree->fromlist);
base_rte = rt_fetch(rtr->rtindex, viewquery->rtable);
Assert(base_rte->rtekind == RTE_RELATION);
if (view_query_is_auto_updatable(viewquery,
RelationIsSecurityView(rel),
false) == NULL)
{
Bitmapset *updatable_cols;
int auto_events;
RangeTblRef *rtr;
RangeTblEntry *base_rte;
Oid baseoid;
if (base_rte->relkind == RELKIND_RELATION)
{
/* Tables are always updatable */
relation_close(rel, AccessShareLock);
return ALL_EVENTS;
}
else
{
/* Do a recursive check for any other kind of base relation */
baseoid = base_rte->relid;
relation_close(rel, AccessShareLock);
return relation_is_updatable(baseoid, include_triggers);
/*
* Determine which of the view's columns are updatable. If there
* are none within the set of of columns we are looking at, then
* the view doesn't support INSERT/UPDATE, but it may still
* support DELETE.
*/
view_cols_are_auto_updatable(viewquery, NULL,
&updatable_cols, NULL);
if (include_cols != NULL)
updatable_cols = bms_int_members(updatable_cols, include_cols);
if (bms_is_empty(updatable_cols))
auto_events = (1 << CMD_DELETE); /* May support DELETE */
else
auto_events = ALL_EVENTS; /* May support all events */
/*
* The base relation must also support these update commands.
* Tables are always updatable, but for any other kind of base
* relation we must do a recursive check limited to the columns
* referenced by the locally updatable columns in this view.
*/
rtr = (RangeTblRef *) linitial(viewquery->jointree->fromlist);
base_rte = rt_fetch(rtr->rtindex, viewquery->rtable);
Assert(base_rte->rtekind == RTE_RELATION);
if (base_rte->relkind != RELKIND_RELATION)
{
baseoid = base_rte->relid;
include_cols = adjust_view_column_set(updatable_cols,
viewquery->targetList);
auto_events &= relation_is_updatable(baseoid,
include_triggers,
include_cols);
}
events |= auto_events;
}
}
@ -2226,7 +2365,7 @@ relation_is_updatable(Oid reloid, bool include_triggers)
* This is used with simply-updatable views to map column-permissions sets for
* the view columns onto the matching columns in the underlying base relation.
* The targetlist is expected to be a list of plain Vars of the underlying
* relation (as per the checks above in view_is_auto_updatable).
* relation (as per the checks above in view_query_is_auto_updatable).
*/
static Bitmapset *
adjust_view_column_set(Bitmapset *cols, List *targetlist)
@ -2304,8 +2443,8 @@ adjust_view_column_set(Bitmapset *cols, List *targetlist)
static Query *
rewriteTargetView(Query *parsetree, Relation view)
{
const char *auto_update_detail;
Query *viewquery;
const char *auto_update_detail;
RangeTblRef *rtr;
int base_rt_index;
int new_rt_index;
@ -2316,8 +2455,14 @@ rewriteTargetView(Query *parsetree, Relation view)
List *view_targetlist;
ListCell *lc;
/* The view must be simply updatable, else fail */
auto_update_detail = view_is_auto_updatable(view);
/* The view must be updatable, else fail */
viewquery = get_view_query(view);
auto_update_detail =
view_query_is_auto_updatable(viewquery,
RelationIsSecurityView(view),
parsetree->commandType != CMD_DELETE);
if (auto_update_detail)
{
/* messages here should match execMain.c's CheckValidResultRel */
@ -2354,15 +2499,70 @@ rewriteTargetView(Query *parsetree, Relation view)
}
}
/*
* For INSERT/UPDATE the modified columns must all be updatable. Note that
* we get the modified columns from the query's targetlist, not from the
* result RTE's modifiedCols set, since rewriteTargetListIU may have added
* additional targetlist entries for view defaults, and these must also be
* updatable.
*/
if (parsetree->commandType != CMD_DELETE)
{
Bitmapset *modified_cols = NULL;
char *non_updatable_col;
foreach(lc, parsetree->targetList)
{
TargetEntry *tle = (TargetEntry *) lfirst(lc);
if (!tle->resjunk)
modified_cols = bms_add_member(modified_cols,
tle->resno - FirstLowInvalidHeapAttributeNumber);
}
auto_update_detail = view_cols_are_auto_updatable(viewquery,
modified_cols,
NULL,
&non_updatable_col);
if (auto_update_detail)
{
/*
* This is a different error, caused by an attempt to update a
* non-updatable column in an otherwise updatable view.
*/
switch (parsetree->commandType)
{
case CMD_INSERT:
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
errmsg("cannot insert into column \"%s\" of view \"%s\"",
non_updatable_col,
RelationGetRelationName(view)),
errdetail_internal("%s", _(auto_update_detail))));
break;
case CMD_UPDATE:
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
errmsg("cannot update column \"%s\" of view \"%s\"",
non_updatable_col,
RelationGetRelationName(view)),
errdetail_internal("%s", _(auto_update_detail))));
break;
default:
elog(ERROR, "unrecognized CmdType: %d",
(int) parsetree->commandType);
break;
}
}
}
/* Locate RTE describing the view in the outer query */
view_rte = rt_fetch(parsetree->resultRelation, parsetree->rtable);
/*
* If we get here, view_is_auto_updatable() has verified that the view
* contains a single base relation.
* If we get here, view_query_is_auto_updatable() has verified that the
* view contains a single base relation.
*/
viewquery = get_view_query(view);
Assert(list_length(viewquery->jointree->fromlist) == 1);
rtr = (RangeTblRef *) linitial(viewquery->jointree->fromlist);
Assert(IsA(rtr, RangeTblRef));

13
src/backend/utils/adt/misc.c
View File

@ -20,6 +20,7 @@
#include <math.h>
#include <unistd.h>
#include "access/sysattr.h"
#include "catalog/catalog.h"
#include "catalog/pg_tablespace.h"
#include "catalog/pg_type.h"
@ -540,17 +541,13 @@ pg_relation_is_updatable(PG_FUNCTION_ARGS)
Oid reloid = PG_GETARG_OID(0);
bool include_triggers = PG_GETARG_BOOL(1);
PG_RETURN_INT32(relation_is_updatable(reloid, include_triggers));
PG_RETURN_INT32(relation_is_updatable(reloid, include_triggers, NULL));
}
/*
* pg_column_is_updatable - determine whether a column is updatable
*
* Currently we just check whether the column's relation is updatable.
* Eventually we might allow views to have some updatable and some
* non-updatable columns.
*
* Also, this function encapsulates the decision about just what
* This function encapsulates the decision about just what
* information_schema.columns.is_updatable actually means. It's not clear
* whether deletability of the column's relation should be required, so
* we want that decision in C code where we could change it without initdb.
@ -560,6 +557,7 @@ pg_column_is_updatable(PG_FUNCTION_ARGS)
{
Oid reloid = PG_GETARG_OID(0);
AttrNumber attnum = PG_GETARG_INT16(1);
AttrNumber col = attnum - FirstLowInvalidHeapAttributeNumber;
bool include_triggers = PG_GETARG_BOOL(2);
int events;
@ -567,7 +565,8 @@ pg_column_is_updatable(PG_FUNCTION_ARGS)
if (attnum <= 0)
PG_RETURN_BOOL(false);
events = relation_is_updatable(reloid, include_triggers);
events = relation_is_updatable(reloid, include_triggers,
bms_make_singleton(col));
/* We require both updatability and deletability of the relation */
#define REQ_EVENTS ((1 << CMD_UPDATE) | (1 << CMD_DELETE))

8
src/include/rewrite/rewriteHandler.h
View File

@ -22,9 +22,11 @@ extern void AcquireRewriteLocks(Query *parsetree, bool forUpdatePushedDown);
extern Node *build_column_default(Relation rel, int attrno);
extern Query *get_view_query(Relation view);
extern const char *view_is_auto_updatable(Relation view);
extern const char *view_query_is_auto_updatable(Query *viewquery,
bool security_barrier);
extern int relation_is_updatable(Oid reloid, bool include_triggers);
bool security_barrier,
bool check_cols);
extern int relation_is_updatable(Oid reloid,
bool include_triggers,
Bitmapset *include_cols);
#endif /* REWRITEHANDLER_H */

296
src/test/regress/expected/updatable_views.out
View File

@ -1,7 +1,8 @@
--
-- UPDATABLE VIEWS
--
-- check that non-updatable views are rejected with useful error messages
-- check that non-updatable views and columns are rejected with useful error
-- messages
CREATE TABLE base_tbl (a int PRIMARY KEY, b text DEFAULT 'Unspecified');
INSERT INTO base_tbl SELECT i, 'Row ' || i FROM generate_series(-2, 2) g(i);
CREATE VIEW ro_view1 AS SELECT DISTINCT a, b FROM base_tbl; -- DISTINCT not supported
@ -17,18 +18,19 @@ CREATE VIEW ro_view10 AS SELECT 1 AS a; -- No base relations
CREATE VIEW ro_view11 AS SELECT b1.a, b2.b FROM base_tbl b1, base_tbl b2; -- Multiple base relations
CREATE VIEW ro_view12 AS SELECT * FROM generate_series(1, 10) AS g(a); -- SRF in rangetable
CREATE VIEW ro_view13 AS SELECT a, b FROM (SELECT * FROM base_tbl) AS t; -- Subselect in rangetable
CREATE VIEW ro_view14 AS SELECT ctid FROM base_tbl; -- System columns not supported
CREATE VIEW ro_view15 AS SELECT a, upper(b) FROM base_tbl; -- Expression/function in targetlist
CREATE VIEW ro_view16 AS SELECT a, b, a AS aa FROM base_tbl; -- Repeated column
CREATE VIEW rw_view14 AS SELECT ctid, a, b FROM base_tbl; -- System columns may be part of an updatable view
CREATE VIEW rw_view15 AS SELECT a, upper(b) FROM base_tbl; -- Expression/function may be part of an updatable view
CREATE VIEW rw_view16 AS SELECT a, b, a AS aa FROM base_tbl; -- Repeated column may be part of an updatable view
CREATE VIEW ro_view17 AS SELECT * FROM ro_view1; -- Base relation not updatable
CREATE VIEW ro_view18 WITH (security_barrier = true)
AS SELECT * FROM base_tbl; -- Security barrier views not updatable
CREATE VIEW ro_view19 AS SELECT * FROM (VALUES(1)) AS tmp(a); -- VALUES in rangetable
CREATE SEQUENCE seq;
CREATE VIEW ro_view20 AS SELECT * FROM seq; -- View based on a sequence
CREATE VIEW ro_view21 AS SELECT a, b, generate_series(1, a) g FROM base_tbl; -- SRF in targetlist not supported
SELECT table_name, is_insertable_into
FROM information_schema.tables
WHERE table_name LIKE 'ro_view%'
WHERE table_name LIKE E'r_\\_view%'
ORDER BY table_name;
table_name | is_insertable_into
------------+--------------------
@ -37,14 +39,12 @@ SELECT table_name, is_insertable_into
ro_view11 | NO
ro_view12 | NO
ro_view13 | NO
ro_view14 | NO
ro_view15 | NO
ro_view16 | NO
ro_view17 | NO
ro_view18 | NO
ro_view19 | NO
ro_view2 | NO
ro_view20 | NO
ro_view21 | NO
ro_view3 | NO
ro_view4 | NO
ro_view5 | NO
@ -52,11 +52,14 @@ SELECT table_name, is_insertable_into
ro_view7 | NO
ro_view8 | NO
ro_view9 | NO
(20 rows)
rw_view14 | YES
rw_view15 | YES
rw_view16 | YES
(21 rows)
SELECT table_name, is_updatable, is_insertable_into
FROM information_schema.views
WHERE table_name LIKE 'ro_view%'
WHERE table_name LIKE E'r_\\_view%'
ORDER BY table_name;
table_name | is_updatable | is_insertable_into
------------+--------------+--------------------
@ -65,14 +68,12 @@ SELECT table_name, is_updatable, is_insertable_into
ro_view11 | NO | NO
ro_view12 | NO | NO
ro_view13 | NO | NO
ro_view14 | NO | NO
ro_view15 | NO | NO
ro_view16 | NO | NO
ro_view17 | NO | NO
ro_view18 | NO | NO
ro_view19 | NO | NO
ro_view2 | NO | NO
ro_view20 | NO | NO
ro_view21 | NO | NO
ro_view3 | NO | NO
ro_view4 | NO | NO
ro_view5 | NO | NO
@ -80,11 +81,14 @@ SELECT table_name, is_updatable, is_insertable_into
ro_view7 | NO | NO
ro_view8 | NO | NO
ro_view9 | NO | NO
(20 rows)
rw_view14 | YES | YES
rw_view15 | YES | YES
rw_view16 | YES | YES
(21 rows)
SELECT table_name, column_name, is_updatable
FROM information_schema.columns
WHERE table_name LIKE 'ro_view%'
WHERE table_name LIKE E'r_\\_view%'
ORDER BY table_name, ordinal_position;
table_name | column_name | is_updatable
------------+---------------+--------------
@ -96,12 +100,6 @@ SELECT table_name, column_name, is_updatable
ro_view12 | a | NO
ro_view13 | a | NO
ro_view13 | b | NO
ro_view14 | ctid | NO
ro_view15 | a | NO
ro_view15 | upper | NO
ro_view16 | a | NO
ro_view16 | b | NO
ro_view16 | aa | NO
ro_view17 | a | NO
ro_view17 | b | NO
ro_view18 | a | NO
@ -119,6 +117,9 @@ SELECT table_name, column_name, is_updatable
ro_view20 | log_cnt | NO
ro_view20 | is_cycled | NO
ro_view20 | is_called | NO
ro_view21 | a | NO
ro_view21 | b | NO
ro_view21 | g | NO
ro_view3 | ?column? | NO
ro_view4 | count | NO
ro_view5 | a | NO
@ -131,8 +132,17 @@ SELECT table_name, column_name, is_updatable
ro_view8 | b | NO
ro_view9 | a | NO
ro_view9 | b | NO
(43 rows)
rw_view14 | ctid | NO
rw_view14 | a | YES
rw_view14 | b | YES
rw_view15 | a | YES
rw_view15 | upper | NO
rw_view16 | a | YES
rw_view16 | b | YES
rw_view16 | aa | YES
(48 rows)
-- Read-only views
DELETE FROM ro_view1;
ERROR: cannot delete from view "ro_view1"
DETAIL: Views containing DISTINCT are not automatically updatable.
@ -147,11 +157,11 @@ DETAIL: Views containing HAVING are not automatically updatable.
HINT: To enable deleting from the view, provide an INSTEAD OF DELETE trigger or an unconditional ON DELETE DO INSTEAD rule.
DELETE FROM ro_view4;
ERROR: cannot delete from view "ro_view4"
DETAIL: Views that return columns that are not columns of their base relation are not automatically updatable.
DETAIL: Views that return aggregate functions are not automatically updatable
HINT: To enable deleting from the view, provide an INSTEAD OF DELETE trigger or an unconditional ON DELETE DO INSTEAD rule.
DELETE FROM ro_view5;
ERROR: cannot delete from view "ro_view5"
DETAIL: Views that return columns that are not columns of their base relation are not automatically updatable.
DETAIL: Views that return window functions are not automatically updatable
HINT: To enable deleting from the view, provide an INSTEAD OF DELETE trigger or an unconditional ON DELETE DO INSTEAD rule.
DELETE FROM ro_view6;
ERROR: cannot delete from view "ro_view6"
@ -185,18 +195,75 @@ INSERT INTO ro_view13 VALUES (3, 'Row 3');
ERROR: cannot insert into view "ro_view13"
DETAIL: Views that do not select from a single table or view are not automatically updatable.
HINT: To enable inserting into the view, provide an INSTEAD OF INSERT trigger or an unconditional ON INSERT DO INSTEAD rule.
INSERT INTO ro_view14 VALUES (null);
ERROR: cannot insert into view "ro_view14"
DETAIL: Views that return system columns are not automatically updatable.
HINT: To enable inserting into the view, provide an INSTEAD OF INSERT trigger or an unconditional ON INSERT DO INSTEAD rule.
INSERT INTO ro_view15 VALUES (3, 'ROW 3');
ERROR: cannot insert into view "ro_view15"
DETAIL: Views that return columns that are not columns of their base relation are not automatically updatable.
HINT: To enable inserting into the view, provide an INSTEAD OF INSERT trigger or an unconditional ON INSERT DO INSTEAD rule.
INSERT INTO ro_view16 VALUES (3, 'Row 3', 3);
ERROR: cannot insert into view "ro_view16"
DETAIL: Views that return the same column more than once are not automatically updatable.
HINT: To enable inserting into the view, provide an INSTEAD OF INSERT trigger or an unconditional ON INSERT DO INSTEAD rule.
-- Partially updatable view
INSERT INTO rw_view14 VALUES (null, 3, 'Row 3'); -- should fail
ERROR: cannot insert into column "ctid" of view "rw_view14"
DETAIL: View columns that refer to system columns are not updatable.
INSERT INTO rw_view14 (a, b) VALUES (3, 'Row 3'); -- should be OK
UPDATE rw_view14 SET ctid=null WHERE a=3; -- should fail
ERROR: cannot update column "ctid" of view "rw_view14"
DETAIL: View columns that refer to system columns are not updatable.
UPDATE rw_view14 SET b='ROW 3' WHERE a=3; -- should be OK
SELECT * FROM base_tbl;
a | b
----+--------
-2 | Row -2
-1 | Row -1
0 | Row 0
1 | Row 1
2 | Row 2
3 | ROW 3
(6 rows)
DELETE FROM rw_view14 WHERE a=3; -- should be OK
-- Partially updatable view
INSERT INTO rw_view15 VALUES (3, 'ROW 3'); -- should fail
ERROR: cannot insert into column "upper" of view "rw_view15"
DETAIL: View columns that are not columns of their base relation are not updatable.
INSERT INTO rw_view15 (a) VALUES (3); -- should be OK
ALTER VIEW rw_view15 ALTER COLUMN upper SET DEFAULT 'NOT SET';
INSERT INTO rw_view15 (a) VALUES (4); -- should fail
ERROR: cannot insert into column "upper" of view "rw_view15"
DETAIL: View columns that are not columns of their base relation are not updatable.
UPDATE rw_view15 SET upper='ROW 3' WHERE a=3; -- should fail
ERROR: cannot update column "upper" of view "rw_view15"
DETAIL: View columns that are not columns of their base relation are not updatable.
UPDATE rw_view15 SET upper=DEFAULT WHERE a=3; -- should fail
ERROR: cannot update column "upper" of view "rw_view15"
DETAIL: View columns that are not columns of their base relation are not updatable.
UPDATE rw_view15 SET a=4 WHERE a=3; -- should be OK
SELECT * FROM base_tbl;
a | b
----+-------------
-2 | Row -2
-1 | Row -1
0 | Row 0
1 | Row 1
2 | Row 2
4 | Unspecified
(6 rows)
DELETE FROM rw_view15 WHERE a=4; -- should be OK
-- Partially updatable view
INSERT INTO rw_view16 VALUES (3, 'Row 3', 3); -- should fail
ERROR: multiple assignments to same column "a"
INSERT INTO rw_view16 (a, b) VALUES (3, 'Row 3'); -- should be OK
UPDATE rw_view16 SET a=3, aa=-3 WHERE a=3; -- should fail
ERROR: multiple assignments to same column "a"
UPDATE rw_view16 SET aa=-3 WHERE a=3; -- should be OK
SELECT * FROM base_tbl;
a | b
----+--------
-2 | Row -2
-1 | Row -1
0 | Row 0
1 | Row 1
2 | Row 2
-3 | Row 3
(6 rows)
DELETE FROM rw_view16 WHERE a=-3; -- should be OK
-- Read-only views
INSERT INTO ro_view17 VALUES (3, 'ROW 3');
ERROR: cannot insert into view "ro_view1"
DETAIL: Views containing DISTINCT are not automatically updatable.
@ -213,8 +280,12 @@ UPDATE ro_view20 SET max_value=1000;
ERROR: cannot update view "ro_view20"
DETAIL: Views that do not select from a single table or view are not automatically updatable.
HINT: To enable updating the view, provide an INSTEAD OF UPDATE trigger or an unconditional ON UPDATE DO INSTEAD rule.
UPDATE ro_view21 SET b=upper(b);
ERROR: cannot update view "ro_view21"
DETAIL: Views that return set-returning functions are not automatically updatable.
HINT: To enable updating the view, provide an INSTEAD OF UPDATE trigger or an unconditional ON UPDATE DO INSTEAD rule.
DROP TABLE base_tbl CASCADE;
NOTICE: drop cascades to 16 other objects
NOTICE: drop cascades to 17 other objects
DETAIL: drop cascades to view ro_view1
drop cascades to view ro_view17
drop cascades to view ro_view2
@ -226,11 +297,12 @@ drop cascades to view ro_view8
drop cascades to view ro_view9
drop cascades to view ro_view11
drop cascades to view ro_view13
drop cascades to view ro_view15
drop cascades to view ro_view16
drop cascades to view rw_view15
drop cascades to view rw_view16
drop cascades to view ro_view18
drop cascades to view ro_view21
drop cascades to view ro_view4
drop cascades to view ro_view14
drop cascades to view rw_view14
DROP VIEW ro_view10, ro_view12, ro_view19;
DROP SEQUENCE seq CASCADE;
NOTICE: drop cascades to view ro_view20
@ -1063,6 +1135,148 @@ SELECT * FROM rw_view1;
DROP TABLE base_tbl CASCADE;
NOTICE: drop cascades to view rw_view1
-- views with updatable and non-updatable columns
CREATE TABLE base_tbl(a float);
INSERT INTO base_tbl SELECT i/10.0 FROM generate_series(1,10) g(i);
CREATE VIEW rw_view1 AS
SELECT ctid, sin(a) s, a, cos(a) c
FROM base_tbl
WHERE a != 0
ORDER BY abs(a);
INSERT INTO rw_view1 VALUES (null, null, 1.1, null); -- should fail
ERROR: cannot insert into column "ctid" of view "rw_view1"
DETAIL: View columns that refer to system columns are not updatable.
INSERT INTO rw_view1 (s, c, a) VALUES (null, null, 1.1); -- should fail
ERROR: cannot insert into column "s" of view "rw_view1"
DETAIL: View columns that are not columns of their base relation are not updatable.
INSERT INTO rw_view1 (a) VALUES (1.1) RETURNING a, s, c; -- OK
a | s | c
-----+-------------------+-------------------
1.1 | 0.891207360061435 | 0.453596121425577
(1 row)
UPDATE rw_view1 SET s = s WHERE a = 1.1; -- should fail
ERROR: cannot update column "s" of view "rw_view1"
DETAIL: View columns that are not columns of their base relation are not updatable.
UPDATE rw_view1 SET a = 1.05 WHERE a = 1.1 RETURNING s; -- OK
s
-------------------
0.867423225594017
(1 row)
DELETE FROM rw_view1 WHERE a = 1.05; -- OK
CREATE VIEW rw_view2 AS
SELECT s, c, s/c t, a base_a, ctid
FROM rw_view1;
INSERT INTO rw_view2 VALUES (null, null, null, 1.1, null); -- should fail
ERROR: cannot insert into column "t" of view "rw_view2"
DETAIL: View columns that are not columns of their base relation are not updatable.
INSERT INTO rw_view2(s, c, base_a) VALUES (null, null, 1.1); -- should fail
ERROR: cannot insert into column "s" of view "rw_view1"
DETAIL: View columns that are not columns of their base relation are not updatable.
INSERT INTO rw_view2(base_a) VALUES (1.1) RETURNING t; -- OK
t
------------------
1.96475965724865
(1 row)
UPDATE rw_view2 SET s = s WHERE base_a = 1.1; -- should fail
ERROR: cannot update column "s" of view "rw_view1"
DETAIL: View columns that are not columns of their base relation are not updatable.
UPDATE rw_view2 SET t = t WHERE base_a = 1.1; -- should fail
ERROR: cannot update column "t" of view "rw_view2"
DETAIL: View columns that are not columns of their base relation are not updatable.
UPDATE rw_view2 SET base_a = 1.05 WHERE base_a = 1.1; -- OK
DELETE FROM rw_view2 WHERE base_a = 1.05 RETURNING base_a, s, c, t; -- OK
base_a | s | c | t
--------+-------------------+-------------------+------------------
1.05 | 0.867423225594017 | 0.497571047891727 | 1.74331530998317
(1 row)
CREATE VIEW rw_view3 AS
SELECT s, c, s/c t, ctid
FROM rw_view1;
INSERT INTO rw_view3 VALUES (null, null, null, null); -- should fail
ERROR: cannot insert into column "t" of view "rw_view3"
DETAIL: View columns that are not columns of their base relation are not updatable.
INSERT INTO rw_view3(s) VALUES (null); -- should fail
ERROR: cannot insert into column "s" of view "rw_view1"
DETAIL: View columns that are not columns of their base relation are not updatable.
UPDATE rw_view3 SET s = s; -- should fail
ERROR: cannot update column "s" of view "rw_view1"
DETAIL: View columns that are not columns of their base relation are not updatable.
DELETE FROM rw_view3 WHERE s = sin(0.1); -- should be OK
SELECT * FROM base_tbl ORDER BY a;
a
-----
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1
(9 rows)
SELECT table_name, is_insertable_into
FROM information_schema.tables
WHERE table_name LIKE E'r_\\_view%'
ORDER BY table_name;
table_name | is_insertable_into
------------+--------------------
rw_view1 | YES
rw_view2 | YES
rw_view3 | NO
(3 rows)
SELECT table_name, is_updatable, is_insertable_into
FROM information_schema.views
WHERE table_name LIKE E'r_\\_view%'
ORDER BY table_name;
table_name | is_updatable | is_insertable_into
------------+--------------+--------------------
rw_view1 | YES | YES
rw_view2 | YES | YES
rw_view3 | NO | NO
(3 rows)
SELECT table_name, column_name, is_updatable
FROM information_schema.columns
WHERE table_name LIKE E'r_\\_view%'
ORDER BY table_name, ordinal_position;
table_name | column_name | is_updatable
------------+-------------+--------------
rw_view1 | ctid | NO
rw_view1 | s | NO
rw_view1 | a | YES
rw_view1 | c | NO
rw_view2 | s | NO
rw_view2 | c | NO
rw_view2 | t | NO
rw_view2 | base_a | YES
rw_view2 | ctid | NO
rw_view3 | s | NO
rw_view3 | c | NO
rw_view3 | t | NO
rw_view3 | ctid | NO
(13 rows)
SELECT events & 4 != 0 AS upd,
events & 8 != 0 AS ins,
events & 16 != 0 AS del
FROM pg_catalog.pg_relation_is_updatable('rw_view3'::regclass, false) t(events);
upd | ins | del
-----+-----+-----
f | f | t
(1 row)
DROP TABLE base_tbl CASCADE;
NOTICE: drop cascades to 3 other objects
DETAIL: drop cascades to view rw_view1
drop cascades to view rw_view2
drop cascades to view rw_view3
-- inheritance tests
CREATE TABLE base_tbl_parent (a int);
CREATE TABLE base_tbl_child (CHECK (a > 0)) INHERITS (base_tbl_parent);
@ -1339,7 +1553,7 @@ CREATE TABLE base_tbl (a int);
CREATE VIEW rw_view1 AS SELECT * FROM base_tbl WITH CHECK OPTION;
CREATE VIEW rw_view2 AS SELECT * FROM rw_view1 WHERE a > 0;
CREATE VIEW rw_view3 AS SELECT * FROM rw_view2 WITH CHECK OPTION;
SELECT * FROM information_schema.views WHERE table_name LIKE E'rw\_view_' ORDER BY table_name;
SELECT * FROM information_schema.views WHERE table_name LIKE E'rw\\_view_' ORDER BY table_name;
table_catalog | table_schema | table_name | view_definition | check_option | is_updatable | is_insertable_into | is_trigger_updatable | is_trigger_deletable | is_trigger_insertable_into
---------------+--------------+------------+---------------------------+--------------+--------------+--------------------+----------------------+----------------------+----------------------------
regression | public | rw_view1 | SELECT base_tbl.a +| CASCADED | YES | YES | NO | NO | NO

110
src/test/regress/sql/updatable_views.sql
View File

@ -2,7 +2,8 @@
-- UPDATABLE VIEWS
--
-- check that non-updatable views are rejected with useful error messages
-- check that non-updatable views and columns are rejected with useful error
-- messages
CREATE TABLE base_tbl (a int PRIMARY KEY, b text DEFAULT 'Unspecified');
INSERT INTO base_tbl SELECT i, 'Row ' || i FROM generate_series(-2, 2) g(i);
@ -20,31 +21,33 @@ CREATE VIEW ro_view10 AS SELECT 1 AS a; -- No base relations
CREATE VIEW ro_view11 AS SELECT b1.a, b2.b FROM base_tbl b1, base_tbl b2; -- Multiple base relations
CREATE VIEW ro_view12 AS SELECT * FROM generate_series(1, 10) AS g(a); -- SRF in rangetable
CREATE VIEW ro_view13 AS SELECT a, b FROM (SELECT * FROM base_tbl) AS t; -- Subselect in rangetable
CREATE VIEW ro_view14 AS SELECT ctid FROM base_tbl; -- System columns not supported
CREATE VIEW ro_view15 AS SELECT a, upper(b) FROM base_tbl; -- Expression/function in targetlist
CREATE VIEW ro_view16 AS SELECT a, b, a AS aa FROM base_tbl; -- Repeated column
CREATE VIEW rw_view14 AS SELECT ctid, a, b FROM base_tbl; -- System columns may be part of an updatable view
CREATE VIEW rw_view15 AS SELECT a, upper(b) FROM base_tbl; -- Expression/function may be part of an updatable view
CREATE VIEW rw_view16 AS SELECT a, b, a AS aa FROM base_tbl; -- Repeated column may be part of an updatable view
CREATE VIEW ro_view17 AS SELECT * FROM ro_view1; -- Base relation not updatable
CREATE VIEW ro_view18 WITH (security_barrier = true)
AS SELECT * FROM base_tbl; -- Security barrier views not updatable
CREATE VIEW ro_view19 AS SELECT * FROM (VALUES(1)) AS tmp(a); -- VALUES in rangetable
CREATE SEQUENCE seq;
CREATE VIEW ro_view20 AS SELECT * FROM seq; -- View based on a sequence
CREATE VIEW ro_view21 AS SELECT a, b, generate_series(1, a) g FROM base_tbl; -- SRF in targetlist not supported
SELECT table_name, is_insertable_into
FROM information_schema.tables
WHERE table_name LIKE 'ro_view%'
WHERE table_name LIKE E'r_\\_view%'
ORDER BY table_name;
SELECT table_name, is_updatable, is_insertable_into
FROM information_schema.views
WHERE table_name LIKE 'ro_view%'
WHERE table_name LIKE E'r_\\_view%'
ORDER BY table_name;
SELECT table_name, column_name, is_updatable
FROM information_schema.columns
WHERE table_name LIKE 'ro_view%'
WHERE table_name LIKE E'r_\\_view%'
ORDER BY table_name, ordinal_position;
-- Read-only views
DELETE FROM ro_view1;
DELETE FROM ro_view2;
DELETE FROM ro_view3;
@ -58,13 +61,36 @@ UPDATE ro_view10 SET a=a+1;
UPDATE ro_view11 SET a=a+1;
UPDATE ro_view12 SET a=a+1;
INSERT INTO ro_view13 VALUES (3, 'Row 3');
INSERT INTO ro_view14 VALUES (null);
INSERT INTO ro_view15 VALUES (3, 'ROW 3');
INSERT INTO ro_view16 VALUES (3, 'Row 3', 3);
-- Partially updatable view
INSERT INTO rw_view14 VALUES (null, 3, 'Row 3'); -- should fail
INSERT INTO rw_view14 (a, b) VALUES (3, 'Row 3'); -- should be OK
UPDATE rw_view14 SET ctid=null WHERE a=3; -- should fail
UPDATE rw_view14 SET b='ROW 3' WHERE a=3; -- should be OK
SELECT * FROM base_tbl;
DELETE FROM rw_view14 WHERE a=3; -- should be OK
-- Partially updatable view
INSERT INTO rw_view15 VALUES (3, 'ROW 3'); -- should fail
INSERT INTO rw_view15 (a) VALUES (3); -- should be OK
ALTER VIEW rw_view15 ALTER COLUMN upper SET DEFAULT 'NOT SET';
INSERT INTO rw_view15 (a) VALUES (4); -- should fail
UPDATE rw_view15 SET upper='ROW 3' WHERE a=3; -- should fail
UPDATE rw_view15 SET upper=DEFAULT WHERE a=3; -- should fail
UPDATE rw_view15 SET a=4 WHERE a=3; -- should be OK
SELECT * FROM base_tbl;
DELETE FROM rw_view15 WHERE a=4; -- should be OK
-- Partially updatable view
INSERT INTO rw_view16 VALUES (3, 'Row 3', 3); -- should fail
INSERT INTO rw_view16 (a, b) VALUES (3, 'Row 3'); -- should be OK
UPDATE rw_view16 SET a=3, aa=-3 WHERE a=3; -- should fail
UPDATE rw_view16 SET aa=-3 WHERE a=3; -- should be OK
SELECT * FROM base_tbl;
DELETE FROM rw_view16 WHERE a=-3; -- should be OK
-- Read-only views
INSERT INTO ro_view17 VALUES (3, 'ROW 3');
INSERT INTO ro_view18 VALUES (3, 'ROW 3');
DELETE FROM ro_view19;
UPDATE ro_view20 SET max_value=1000;
UPDATE ro_view21 SET b=upper(b);
DROP TABLE base_tbl CASCADE;
DROP VIEW ro_view10, ro_view12, ro_view19;
@ -510,6 +536,68 @@ SELECT * FROM rw_view1;
DROP TABLE base_tbl CASCADE;
-- views with updatable and non-updatable columns
CREATE TABLE base_tbl(a float);
INSERT INTO base_tbl SELECT i/10.0 FROM generate_series(1,10) g(i);
CREATE VIEW rw_view1 AS
SELECT ctid, sin(a) s, a, cos(a) c
FROM base_tbl
WHERE a != 0
ORDER BY abs(a);
INSERT INTO rw_view1 VALUES (null, null, 1.1, null); -- should fail
INSERT INTO rw_view1 (s, c, a) VALUES (null, null, 1.1); -- should fail
INSERT INTO rw_view1 (a) VALUES (1.1) RETURNING a, s, c; -- OK
UPDATE rw_view1 SET s = s WHERE a = 1.1; -- should fail
UPDATE rw_view1 SET a = 1.05 WHERE a = 1.1 RETURNING s; -- OK
DELETE FROM rw_view1 WHERE a = 1.05; -- OK
CREATE VIEW rw_view2 AS
SELECT s, c, s/c t, a base_a, ctid
FROM rw_view1;
INSERT INTO rw_view2 VALUES (null, null, null, 1.1, null); -- should fail
INSERT INTO rw_view2(s, c, base_a) VALUES (null, null, 1.1); -- should fail
INSERT INTO rw_view2(base_a) VALUES (1.1) RETURNING t; -- OK
UPDATE rw_view2 SET s = s WHERE base_a = 1.1; -- should fail
UPDATE rw_view2 SET t = t WHERE base_a = 1.1; -- should fail
UPDATE rw_view2 SET base_a = 1.05 WHERE base_a = 1.1; -- OK
DELETE FROM rw_view2 WHERE base_a = 1.05 RETURNING base_a, s, c, t; -- OK
CREATE VIEW rw_view3 AS
SELECT s, c, s/c t, ctid
FROM rw_view1;
INSERT INTO rw_view3 VALUES (null, null, null, null); -- should fail
INSERT INTO rw_view3(s) VALUES (null); -- should fail
UPDATE rw_view3 SET s = s; -- should fail
DELETE FROM rw_view3 WHERE s = sin(0.1); -- should be OK
SELECT * FROM base_tbl ORDER BY a;
SELECT table_name, is_insertable_into
FROM information_schema.tables
WHERE table_name LIKE E'r_\\_view%'
ORDER BY table_name;
SELECT table_name, is_updatable, is_insertable_into
FROM information_schema.views
WHERE table_name LIKE E'r_\\_view%'
ORDER BY table_name;
SELECT table_name, column_name, is_updatable
FROM information_schema.columns
WHERE table_name LIKE E'r_\\_view%'
ORDER BY table_name, ordinal_position;
SELECT events & 4 != 0 AS upd,
events & 8 != 0 AS ins,
events & 16 != 0 AS del
FROM pg_catalog.pg_relation_is_updatable('rw_view3'::regclass, false) t(events);
DROP TABLE base_tbl CASCADE;
-- inheritance tests
CREATE TABLE base_tbl_parent (a int);
@ -611,7 +699,7 @@ CREATE TABLE base_tbl (a int);
CREATE VIEW rw_view1 AS SELECT * FROM base_tbl WITH CHECK OPTION;
CREATE VIEW rw_view2 AS SELECT * FROM rw_view1 WHERE a > 0;
CREATE VIEW rw_view3 AS SELECT * FROM rw_view2 WITH CHECK OPTION;
SELECT * FROM information_schema.views WHERE table_name LIKE E'rw\_view_' ORDER BY table_name;
SELECT * FROM information_schema.views WHERE table_name LIKE E'rw\\_view_' ORDER BY table_name;
INSERT INTO rw_view1 VALUES (-1); -- ok
INSERT INTO rw_view1 VALUES (1); -- ok