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Make explicit the restrictions on UPDATE, DELETE, and INSERT statement syntax

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within triggers.  Ticket #3947. (CVS 6840)

FossilOrigin-Name: c8bf40df7be728b11bb633516d1988c6064a9d70
This commit is contained in:
drh
2009-07-03 15:37:27 +00:00
parent 06150f95e8
commit b1819a0b95
5 changed files with 117 additions and 28 deletions
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48
src/parse.y
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@@ -14,7 +14,7 @@
** the parser. Lemon will also generate a header file containing
** numeric codes for all of the tokens.
**
** @(#) $Id: parse.y,v 1.284 2009/07/01 14:56:40 danielk1977 Exp $
** @(#) $Id: parse.y,v 1.285 2009/07/03 15:37:28 drh Exp $
*/
// All token codes are small integers with #defines that begin with "TK_"
@@ -1179,22 +1179,54 @@ trigger_cmd_list(A) ::= trigger_cmd(X) SEMI. {
A = X;
}
// Disallow qualified table names on INSERT, UPDATE, and DELETE statements
// within a trigger. The table to INSERT, UPDATE, or DELETE is always in
// the same database as the table that the trigger fires on.
//
%type trnm {Token}
trnm(A) ::= nm(X). {A = X;}
trnm(A) ::= nm DOT nm(X). {
A = X;
sqlite3ErrorMsg(pParse,
"qualified table names are not allowed on INSERT, UPDATE, and DELETE "
"statements within triggers");
}
// Disallow the INDEX BY and NOT INDEXED clauses on UPDATE and DELETE
// statements within triggers. We make a specific error message for this
// since it is an exception to the default grammar rules.
//
tridxby ::= .
tridxby ::= INDEXED BY nm. {
sqlite3ErrorMsg(pParse,
"the INDEXED BY clause is not allowed on UPDATE or DELETE statements "
"within triggers");
}
tridxby ::= NOT INDEXED. {
sqlite3ErrorMsg(pParse,
"the NOT INDEXED clause is not allowed on UPDATE or DELETE statements "
"within triggers");
}
%type trigger_cmd {TriggerStep*}
%destructor trigger_cmd {sqlite3DeleteTriggerStep(pParse->db, $$);}
// UPDATE
trigger_cmd(A) ::= UPDATE orconf(R) nm(X) SET setlist(Y) where_opt(Z).
{ A = sqlite3TriggerUpdateStep(pParse->db, &X, Y, Z, R); }
trigger_cmd(A) ::=
UPDATE orconf(R) trnm(X) tridxby SET setlist(Y) where_opt(Z).
{ A = sqlite3TriggerUpdateStep(pParse->db, &X, Y, Z, R); }
// INSERT
trigger_cmd(A) ::= insert_cmd(R) INTO nm(X) inscollist_opt(F)
VALUES LP itemlist(Y) RP.
{A = sqlite3TriggerInsertStep(pParse->db, &X, F, Y, 0, R);}
trigger_cmd(A) ::=
insert_cmd(R) INTO trnm(X) inscollist_opt(F) VALUES LP itemlist(Y) RP.
{A = sqlite3TriggerInsertStep(pParse->db, &X, F, Y, 0, R);}
trigger_cmd(A) ::= insert_cmd(R) INTO nm(X) inscollist_opt(F) select(S).
trigger_cmd(A) ::= insert_cmd(R) INTO trnm(X) inscollist_opt(F) select(S).
{A = sqlite3TriggerInsertStep(pParse->db, &X, F, 0, S, R);}
// DELETE
trigger_cmd(A) ::= DELETE FROM nm(X) where_opt(Y).
trigger_cmd(A) ::= DELETE FROM trnm(X) tridxby where_opt(Y).
{A = sqlite3TriggerDeleteStep(pParse->db, &X, Y);}
// SELECT