static sql_rel *
create_trigger(mvc *sql, dlist *qname, int time, symbol *trigger_event, char *table_name, dlist *opt_ref, dlist *triggered_action)
{
char *tname = qname_table(qname);
sql_schema *ss = cur_schema(sql);
sql_table *t = NULL;
int instantiate = (sql->emode == m_instantiate);
int create = (!instantiate && sql->emode != m_deps);
list *sq = NULL;
sql_rel *r = NULL;
dlist *columns = trigger_event->data.lval;
char *old_name = NULL, *new_name = NULL;
dlist *stmts = triggered_action->h->next->next->data.lval;
if (opt_ref) {
dnode *dl = opt_ref->h;
for ( ; dl; dl = dl->next) {
/* list (new(1)/old(0)), char */
char *n = dl->data.lval->h->next->data.sval;
assert(dl->data.lval->h->type == type_int);
if (!dl->data.lval->h->data.i_val) /*?l_val?*/
old_name = n;
else
new_name = n;
}
}
if (create && !schema_privs(sql->role_id, ss))
return sql_error(sql, 02, "CREATE TRIGGER: access denied for %s to schema ;'%s'", stack_get_string(sql, "current_user"), ss->base.name);
if (create && mvc_bind_trigger(sql, ss, tname) != NULL)
return sql_error(sql, 02, "CREATE TRIGGER: name '%s' already in use", tname);
if (create && !(t = mvc_bind_table(sql, ss, table_name)))
return sql_error(sql, 02, "CREATE TRIGGER: unknown table '%s'", table_name);
if (create && isView(t))
return sql_error(sql, 02, "CREATE TRIGGER: cannot create trigger on view '%s'", table_name);
if (create) {
int event = (trigger_event->token == SQL_INSERT)?0:
(trigger_event->token == SQL_DELETE)?1:2;
int orientation = triggered_action->h->data.i_val;
char *condition = triggered_action->h->next->data.sval;
char *q = QUERY(sql->scanner);
assert(triggered_action->h->type == type_int);
return rel_create_trigger(sql, t->s->base.name, t->base.name, tname, time, orientation, event, old_name, new_name, condition, q);
}
t = mvc_bind_table(sql, ss, table_name);
stack_push_frame(sql, "OLD-NEW");
/* we need to add the old and new tables */
if (new_name)
_stack_push_table(sql, new_name, t);
if (old_name)
_stack_push_table(sql, old_name, t);
sq = sequential_block(sql, NULL, NULL, stmts, NULL, 1);
r = rel_psm_block(sql->sa, sq);
/* todo trigger_columns */
(void)columns;
return r;
}
static sql_rel *
create_trigger(mvc *sql, dlist *qname, int time, symbol *trigger_event, dlist *tqname, dlist *opt_ref, dlist *triggered_action, int replace)
{
const char *triggerschema = qname_schema(qname);
const char *triggername = qname_table(qname);
const char *sname = qname_schema(tqname);
const char *tname = qname_table(tqname);
sql_schema *ss = cur_schema(sql);
sql_table *t = NULL;
sql_trigger *st = NULL;
int instantiate = (sql->emode == m_instantiate);
int create = (!instantiate && sql->emode != m_deps), event, orientation;
list *sq = NULL;
sql_rel *r = NULL;
char *q, *base = replace ? "CREATE OR REPLACE" : "CREATE";
dlist *columns = trigger_event->data.lval;
const char *old_name = NULL, *new_name = NULL;
dlist *stmts = triggered_action->h->next->next->data.lval;
symbol *condition = triggered_action->h->next->data.sym;
if (!sname)
sname = ss->base.name;
if (sname && !(ss = mvc_bind_schema(sql, sname)))
return sql_error(sql, 02, SQLSTATE(3F000) "%s TRIGGER: no such schema '%s'", base, sname);
if (opt_ref) {
dnode *dl = opt_ref->h;
for ( ; dl; dl = dl->next) {
/* list (new(1)/old(0)), char */
char *n = dl->data.lval->h->next->data.sval;
assert(dl->data.lval->h->type == type_int);
if (!dl->data.lval->h->data.i_val) /*?l_val?*/
old_name = n;
else
new_name = n;
}
}
if (create && !mvc_schema_privs(sql, ss))
return sql_error(sql, 02, SQLSTATE(42000) "%s TRIGGER: access denied for %s to schema ;'%s'", base, stack_get_string(sql, "current_user"), ss->base.name);
if (create && !(t = mvc_bind_table(sql, ss, tname)))
return sql_error(sql, 02, SQLSTATE(42000) "%s TRIGGER: unknown table '%s'", base, tname);
if (create && isView(t))
return sql_error(sql, 02, SQLSTATE(42000) "%s TRIGGER: cannot create trigger on view '%s'", base, tname);
if (triggerschema && strcmp(triggerschema, sname) != 0)
return sql_error(sql, 02, SQLSTATE(42000) "%s TRIGGER: trigger and respective table must belong to the same schema", base);
if (create && (st = mvc_bind_trigger(sql, ss, triggername)) != NULL) {
if (replace) {
if(mvc_drop_trigger(sql, ss, st))
return sql_error(sql, 02, SQLSTATE(HY001) "%s TRIGGER: %s", base, MAL_MALLOC_FAIL);
} else {
return sql_error(sql, 02, SQLSTATE(42000) "%s TRIGGER: name '%s' already in use", base, triggername);
}
}
if (create) {
switch (trigger_event->token) {
case SQL_INSERT:
event = 0;
break;
case SQL_DELETE:
event = 1;
break;
case SQL_TRUNCATE:
event = 3;
break;
default:
event = 2;
break;
}
orientation = triggered_action->h->data.i_val;
q = query_cleaned(QUERY(sql->scanner));
assert(triggered_action->h->type == type_int);
r = rel_create_trigger(sql, t->s->base.name, t->base.name, triggername, time, orientation, event, old_name, new_name, condition, q);
GDKfree(q);
return r;
}
if (!instantiate) {
t = mvc_bind_table(sql, ss, tname);
if(!stack_push_frame(sql, "OLD-NEW"))
return sql_error(sql, 02, SQLSTATE(HY001) MAL_MALLOC_FAIL);
/* we need to add the old and new tables */
if (!instantiate && new_name) {
if(!_stack_push_table(sql, new_name, t))
return sql_error(sql, 02, SQLSTATE(HY001) MAL_MALLOC_FAIL);
}
if (!instantiate && old_name) {
if(!_stack_push_table(sql, old_name, t))
return sql_error(sql, 02, SQLSTATE(HY001) MAL_MALLOC_FAIL);
}
}
if (condition) {
sql_rel *rel = NULL;
if (new_name) /* in case of updates same relations is available via both names */
rel = stack_find_rel_view(sql, new_name);
if (!rel && old_name)
rel = stack_find_rel_view(sql, old_name);
if (rel)
rel = rel_logical_exp(sql, rel, condition, sql_where);
if (!rel)
return NULL;
/* transition tables */
/* insert: rel_select(table [new], searchcondition) */
/* delete: rel_select(table [old], searchcondition) */
/* update: rel_select(table [old,new]), searchcondition) */
if (new_name)
stack_update_rel_view(sql, new_name, rel);
if (old_name)
stack_update_rel_view(sql, old_name, new_name?rel_dup(rel):rel);
}
sq = sequential_block(sql, NULL, NULL, stmts, NULL, 1);
r = rel_psm_block(sql->sa, sq);
/* todo trigger_columns */
(void)columns;
return r;
}
