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WITH CHECK OPTION support for auto-updatable VIEWs

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For simple views which are automatically updatable, this patch allows
the user to specify what level of checking should be done on records
being inserted or updated.  For 'LOCAL CHECK', new tuples are validated
against the conditionals of the view they are being inserted into, while
for 'CASCADED CHECK' the new tuples are validated against the
conditionals for all views involved (from the top down).

This option is part of the SQL specification.

Dean Rasheed, reviewed by Pavel Stehule
This commit is contained in:
Stephen Frost
2013-07-18 17:10:16 -04:00
parent 6f9e39bc99
commit 4cbe3ac3e8
33 changed files with 1245 additions and 107 deletions
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36
src/backend/commands/tablecmds.c
View File

@ -8774,6 +8774,42 @@ ATExecSetRelOptions(Relation rel, List *defList, AlterTableType operation,
break;
}
/* Special-case validation of view options */
if (rel->rd_rel->relkind == RELKIND_VIEW)
{
Query *view_query = get_view_query(rel);
List *view_options = untransformRelOptions(newOptions);
ListCell *cell;
bool check_option = false;
bool security_barrier = false;
foreach(cell, view_options)
{
DefElem *defel = (DefElem *) lfirst(cell);
if (pg_strcasecmp(defel->defname, "check_option") == 0)
check_option = true;
if (pg_strcasecmp(defel->defname, "security_barrier") == 0)
security_barrier = defGetBoolean(defel);
}
/*
* If the check option is specified, look to see if the view is
* actually auto-updatable or not.
*/
if (check_option)
{
const char *view_updatable_error =
view_query_is_auto_updatable(view_query, security_barrier);
if (view_updatable_error)
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
errmsg("WITH CHECK OPTION is supported only on auto-updatable views"),
errhint("%s", view_updatable_error)));
}
}
/*
* All we need do here is update the pg_class row; the new options will be
* propagated into relcaches during post-commit cache inval.