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Overview
| Comment: | Fix a fairly obscure problem allowing an "ALTER TABLE RENAME col TO ..." statement to modify the schema in such a way as to break a reference within a trigger program. |
|---|---|
| Downloads: | Tarball | ZIP archive | SQL archive |
| Timelines: | family | ancestors | descendants | both | trunk |
| Files: | files | file ages | folders |
| SHA3-256: |
64bec9e6214c6932fab5a3fb8c569ae1 |
| User & Date: | dan 2019-01-18 16:06:18 |
Context
|
2019-01-18
| ||
| 17:53 | Handle oversize floating point values carefully when converting to integers for the '%' binary operator. check-in: 048add13 user: drh tags: trunk | |
| 16:06 | Fix a fairly obscure problem allowing an "ALTER TABLE RENAME col TO ..." statement to modify the schema in such a way as to break a reference within a trigger program. check-in: 64bec9e6 user: dan tags: trunk | |
| 14:53 | Use the full 64-bit integer value in the argument to randomblob(). check-in: 05df5f7a user: drh tags: trunk | |
Changes
Changes to src/alter.c.
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** message in the Parse object.
*/
static int renameResolveTrigger(Parse *pParse, const char *zDb){
sqlite3 *db = pParse->db;
Trigger *pNew = pParse->pNewTrigger;
TriggerStep *pStep;
NameContext sNC;
SrcList sSrc;
int rc = SQLITE_OK;
memset(&sNC, 0, sizeof(sNC));
sNC.pParse = pParse;
assert( pNew->pTabSchema );
pParse->pTriggerTab = sqlite3FindTable(db, pNew->table,
db->aDb[sqlite3SchemaToIndex(db, pNew->pTabSchema)].zDbSName
................................................................................
if( pParse->nErr ) rc = pParse->rc;
}
if( rc==SQLITE_OK && pStep->zTarget ){
Table *pTarget = sqlite3LocateTable(pParse, 0, pStep->zTarget, zDb);
if( pTarget==0 ){
rc = SQLITE_ERROR;
}else if( SQLITE_OK==(rc = sqlite3ViewGetColumnNames(pParse, pTarget)) ){
memset(&sSrc, 0, sizeof(sSrc));
sSrc.nSrc = 1;
sSrc.a[0].zName = pStep->zTarget;
sSrc.a[0].pTab = pTarget;
sNC.pSrcList = &sSrc;
if( pStep->pWhere ){
rc = sqlite3ResolveExprNames(&sNC, pStep->pWhere);
................................................................................
rc = sqlite3ResolveExprNames(&sNC, pUpsert->pUpsertWhere);
}
if( rc==SQLITE_OK ){
rc = sqlite3ResolveExprNames(&sNC, pUpsert->pUpsertTargetWhere);
}
sNC.ncFlags = 0;
}
}
}
}
return rc;
}
/*
|
< > > |
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** message in the Parse object.
*/
static int renameResolveTrigger(Parse *pParse, const char *zDb){
sqlite3 *db = pParse->db;
Trigger *pNew = pParse->pNewTrigger;
TriggerStep *pStep;
NameContext sNC;
int rc = SQLITE_OK;
memset(&sNC, 0, sizeof(sNC));
sNC.pParse = pParse;
assert( pNew->pTabSchema );
pParse->pTriggerTab = sqlite3FindTable(db, pNew->table,
db->aDb[sqlite3SchemaToIndex(db, pNew->pTabSchema)].zDbSName
................................................................................
if( pParse->nErr ) rc = pParse->rc;
}
if( rc==SQLITE_OK && pStep->zTarget ){
Table *pTarget = sqlite3LocateTable(pParse, 0, pStep->zTarget, zDb);
if( pTarget==0 ){
rc = SQLITE_ERROR;
}else if( SQLITE_OK==(rc = sqlite3ViewGetColumnNames(pParse, pTarget)) ){
SrcList sSrc;
memset(&sSrc, 0, sizeof(sSrc));
sSrc.nSrc = 1;
sSrc.a[0].zName = pStep->zTarget;
sSrc.a[0].pTab = pTarget;
sNC.pSrcList = &sSrc;
if( pStep->pWhere ){
rc = sqlite3ResolveExprNames(&sNC, pStep->pWhere);
................................................................................
rc = sqlite3ResolveExprNames(&sNC, pUpsert->pUpsertWhere);
}
if( rc==SQLITE_OK ){
rc = sqlite3ResolveExprNames(&sNC, pUpsert->pUpsertTargetWhere);
}
sNC.ncFlags = 0;
}
sNC.pSrcList = 0;
}
}
}
return rc;
}
/*
|
Changes to test/altertab2.test.
301 302 303 304 305 306 307 308 309 310 311 |
} {
{CREATE TRIGGER r1 AFTER INSERT ON "xyzzy" BEGIN
INSERT INTO t2
SELECT a,b,ccc FROM "xyzzy" UNION SELECT d,e,f FROM "xyzzy" ORDER BY b,ccc;
END}
}
finish_test
|
> > > > > > > > > > > > > > > > > > > > > > > > > > > |
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} {
{CREATE TRIGGER r1 AFTER INSERT ON "xyzzy" BEGIN
INSERT INTO t2
SELECT a,b,ccc FROM "xyzzy" UNION SELECT d,e,f FROM "xyzzy" ORDER BY b,ccc;
END}
}
#-------------------------------------------------------------------------
reset_db
do_execsql_test 8.0 {
CREATE TABLE t1(a, b, c);
CREATE TABLE t2(a, b, c);
CREATE TABLE t3(d, e, f);
CREATE VIEW v1 AS SELECT * FROM t1;
CREATE TRIGGER tr AFTER INSERT ON t3 BEGIN
UPDATE t2 SET a = new.d;
SELECT a, b, c FROM v1;
END;
}
do_execsql_test 8.1 {
INSERT INTO t3 VALUES(1, 2, 3);
}
# The following ALTER TABLE fails as if column "t1.a" is renamed the "a"
# in the "SELECT a, b, c FROM v1" within the trigger can no longer be
# resolved. But at one point there was a bug allowing the ALTER TABLE
# succeed. Which meant the subsequent INSERT statement would fail.
do_catchsql_test 8.2 {
ALTER TABLE t1 RENAME a TO aaa;
} {1 {error in trigger tr after rename: no such column: a}}
do_execsql_test 8.3 {
INSERT INTO t3 VALUES(4, 5, 6);
}
finish_test
|