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Overview
| Comment: | Fix some issues with UPDATE changes in the session module. |
|---|---|
| Downloads: | Tarball | ZIP archive | SQL archive |
| Timelines: | family | ancestors | descendants | both | sessions |
| Files: | files | file ages | folders |
| SHA1: |
57862efe718fdc93401998f905851129 |
| User & Date: | dan 2011-03-12 17:22:46 |
Context
|
2011-03-14
| ||
| 19:49 | Fix handling of return values from the conflict handler. Document the conflict handler arguments and return codes in sqlite3session.h. check-in: cbbb274e user: dan tags: sessions | |
|
2011-03-12
| ||
| 17:22 | Fix some issues with UPDATE changes in the session module. check-in: 57862efe user: dan tags: sessions | |
|
2011-03-11
| ||
| 19:05 | Add the sqlite3changeset_apply() function. Does not yet handle all cases. check-in: 2b19be7b user: dan tags: sessions | |
Changes
Changes to ext/session/sqlite3session.c.
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if( *pRc==SQLITE_OK ){
SessionBuffer buf2 = {0, 0, 0};
int bNoop = 1;
int i;
u8 *pCsr = p->aRecord;
sessionAppendByte(pBuf, SQLITE_UPDATE, pRc);
for(i=0; i<sqlite3_column_count(pStmt); i++){
int nCopy = 0;
int nAdvance;
int eType = *pCsr;
switch( eType ){
case SQLITE_NULL:
nAdvance = 1;
if( sqlite3_column_type(pStmt, i)!=SQLITE_NULL ){
nCopy = 1;
}
break;
case SQLITE_FLOAT:
case SQLITE_INTEGER: {
nAdvance = 9;
if( eType==sqlite3_column_type(pStmt, i) ){
................................................................................
if( iVal==sqlite3_column_int64(pStmt, i) ) break;
}else{
double dVal;
memcpy(&dVal, &iVal, 8);
if( dVal==sqlite3_column_double(pStmt, i) ) break;
}
}
nCopy = 9;
break;
}
case SQLITE_TEXT:
case SQLITE_BLOB: {
int nByte;
int nHdr = 1 + sessionVarintGet(&pCsr[1], &nByte);
................................................................................
nAdvance = nHdr + nByte;
if( eType==sqlite3_column_type(pStmt, i)
&& nByte==sqlite3_column_bytes(pStmt, i)
&& 0==memcmp(&pCsr[nHdr], sqlite3_column_blob(pStmt, i), nByte)
){
break;
}
nCopy = nAdvance;
}
}
if( abPK[i] ){
nCopy = nAdvance;
}
if( nCopy==0 ){
sessionAppendByte(pBuf, 0, pRc);
sessionAppendByte(&buf2, 0, pRc);
}else{
sessionAppendBlob(pBuf, pCsr, nCopy, pRc);
sessionAppendCol(&buf2, pStmt, i, pRc);
bNoop = 0;
}
pCsr += nAdvance;
}
if( bNoop ){
pBuf->nBuf -= (1 + sqlite3_column_count(pStmt));
}else{
sessionAppendBlob(pBuf, buf2.aBuf, buf2.nBuf, pRc);
................................................................................
if( rc==SQLITE_OK ){
rc = sqlite3_prepare_v2(db, (char *)buf.aBuf, buf.nBuf, ppStmt, 0);
}
sqlite3_free(buf.aBuf);
}
return rc;
}
int sqlite3changeset_apply(
sqlite3 *db,
int nChangeset,
void *pChangeset,
int(*xConflict)(
void *pCtx, /* Copy of fifth arg to _apply() */
................................................................................
sqlite3_stmt *pDelete = 0; /* DELETE statement */
sqlite3_stmt *pUpdate = 0; /* DELETE statement */
sqlite3_stmt *pInsert = 0; /* INSERT statement */
sqlite3_stmt *pSelect = 0; /* SELECT statement */
rc = sqlite3_exec(db, "SAVEPOINT changeset_apply", 0, 0, 0);
sqlite3changeset_start(&pIter, nChangeset, pChangeset);
while( SQLITE_ROW==sqlite3changeset_next(pIter) ){
int op;
const char *zThis;
sqlite3changeset_op(pIter, &zThis, &nCol, &op);
if( zTab==0 || sqlite3_strnicmp(zThis, zTab, nTab+1) ){
sqlite3_free(azCol);
................................................................................
nTab = strlen(zTab);
sqlite3_finalize(pDelete);
sqlite3_finalize(pUpdate);
sqlite3_finalize(pInsert);
sqlite3_finalize(pSelect);
pSelect = pUpdate = pInsert = pDelete = 0;
}
if( op==SQLITE_DELETE ){
int res;
int i;
rc = sessionDeleteRow(db, zTab, nCol, azCol, abPK, &pDelete);
for(i=0; rc==SQLITE_OK && i<nCol; i++){
................................................................................
rc = sqlite3changeset_old(pIter, i, &pOld);
if( rc==SQLITE_OK ){
rc = sqlite3changeset_new(pIter, i, &pNew);
}
if( rc==SQLITE_OK ){
if( pOld ) sqlite3_bind_value(pUpdate, i*3+1, pOld);
sqlite3_bind_int(pUpdate, i*3+2, !!pNew);
if( pNew ) sqlite3_bind_value(pUpdate, i*3+3, pOld);
}
}
if( rc==SQLITE_OK ) rc = sqlite3_bind_int(pUpdate, nCol*3+1, 0);
if( rc!=SQLITE_OK ) break;
sqlite3_step(pUpdate);
rc = sqlite3_reset(pUpdate);
................................................................................
}else{
rc = sqlite3_reset(pSelect);
if( rc==SQLITE_OK ){
res = xConflict(pCtx, SQLITE_CHANGESET_NOTFOUND, pIter);
}
}
}else if( rc==SQLITE_CONSTRAINT ){
assert(0);
}
}else{
int i;
assert( op==SQLITE_INSERT );
if( pInsert==0 ){
SessionBuffer buf = {0, 0, 0};
................................................................................
}
}
if( rc!=SQLITE_OK ) break;
sqlite3_step(pInsert);
rc = sqlite3_reset(pInsert);
if( rc==SQLITE_CONSTRAINT && xConflict ){
int res;
/* Figure out if this is a primary key or other constraint. */
rc = sessionSelectRow(db, zTab, nCol, azCol, abPK, &pSelect);
for(i=0; rc==SQLITE_OK && i<nCol; i++){
if( abPK[i] ){
sqlite3_value *pVal;
rc = sqlite3changeset_new(pIter, i, &pVal);
if( rc==SQLITE_OK ) sqlite3_bind_value(pSelect, i+1, pVal);
}
}
if( rc!=SQLITE_OK ) break;
if( SQLITE_ROW==sqlite3_step(pSelect) ){
pIter->pConflict = pSelect;
res = xConflict(pCtx, SQLITE_CHANGESET_CONFLICT, pIter);
pIter->pConflict = 0;
sqlite3_reset(pSelect);
}else{
rc = sqlite3_reset(pSelect);
if( rc==SQLITE_OK ){
res = xConflict(pCtx, SQLITE_CHANGESET_CONSTRAINT, pIter);
}
}
}
}
}
rc2 = sqlite3changeset_finalize(pIter);
if( rc==SQLITE_DONE ) rc = rc2;
if( rc==SQLITE_OK ){
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if( *pRc==SQLITE_OK ){
SessionBuffer buf2 = {0, 0, 0};
int bNoop = 1;
int i;
u8 *pCsr = p->aRecord;
sessionAppendByte(pBuf, SQLITE_UPDATE, pRc);
for(i=0; i<sqlite3_column_count(pStmt); i++){
int bChanged = 0;
int nAdvance;
int eType = *pCsr;
switch( eType ){
case SQLITE_NULL:
nAdvance = 1;
if( sqlite3_column_type(pStmt, i)!=SQLITE_NULL ){
bChanged = 1;
}
break;
case SQLITE_FLOAT:
case SQLITE_INTEGER: {
nAdvance = 9;
if( eType==sqlite3_column_type(pStmt, i) ){
................................................................................
if( iVal==sqlite3_column_int64(pStmt, i) ) break;
}else{
double dVal;
memcpy(&dVal, &iVal, 8);
if( dVal==sqlite3_column_double(pStmt, i) ) break;
}
}
bChanged = 1;
break;
}
case SQLITE_TEXT:
case SQLITE_BLOB: {
int nByte;
int nHdr = 1 + sessionVarintGet(&pCsr[1], &nByte);
................................................................................
nAdvance = nHdr + nByte;
if( eType==sqlite3_column_type(pStmt, i)
&& nByte==sqlite3_column_bytes(pStmt, i)
&& 0==memcmp(&pCsr[nHdr], sqlite3_column_blob(pStmt, i), nByte)
){
break;
}
bChanged = 1;
}
}
if( bChanged || abPK[i] ){
sessionAppendBlob(pBuf, pCsr, nAdvance, pRc);
}else{
sessionAppendByte(pBuf, 0, pRc);
}
if( bChanged ){
sessionAppendCol(&buf2, pStmt, i, pRc);
bNoop = 0;
}else{
sessionAppendByte(&buf2, 0, pRc);
}
pCsr += nAdvance;
}
if( bNoop ){
pBuf->nBuf -= (1 + sqlite3_column_count(pStmt));
}else{
sessionAppendBlob(pBuf, buf2.aBuf, buf2.nBuf, pRc);
................................................................................
if( rc==SQLITE_OK ){
rc = sqlite3_prepare_v2(db, (char *)buf.aBuf, buf.nBuf, ppStmt, 0);
}
sqlite3_free(buf.aBuf);
}
return rc;
}
static int sessionConstraintConflict(
sqlite3 *db, /* Database handle */
sqlite3_changeset_iter *pIter, /* Changeset iterator */
u8 *abPK, /* Primary key flags array */
sqlite3_stmt *pSelect, /* SELECT statement from sessionSelectRow() */
int(*xConflict)(void *, int, sqlite3_changeset_iter*),
void *pCtx
){
int res;
int rc;
int i;
int nCol;
int op;
const char *zDummy;
sqlite3changeset_op(pIter, &zDummy, &nCol, &op);
assert( op==SQLITE_UPDATE || op==SQLITE_INSERT );
/* Bind the new.* PRIMARY KEY values to the SELECT statement. */
for(i=0; i<nCol; i++){
if( abPK[i] ){
sqlite3_value *pVal;
if( op==SQLITE_UPDATE ) rc = sqlite3changeset_old(pIter, i, &pVal);
else rc = sqlite3changeset_new(pIter, i, &pVal);
if( rc!=SQLITE_OK ) return rc;
sqlite3_bind_value(pSelect, i+1, pVal);
}
}
if( SQLITE_ROW==sqlite3_step(pSelect) ){
/* There exists another row with the new.* primary key. */
pIter->pConflict = pSelect;
res = xConflict(pCtx, SQLITE_CHANGESET_CONFLICT, pIter);
pIter->pConflict = 0;
sqlite3_reset(pSelect);
}else{
/* No other row with the new.* primary key. */
rc = sqlite3_reset(pSelect);
if( rc==SQLITE_OK ){
res = xConflict(pCtx, SQLITE_CHANGESET_CONSTRAINT, pIter);
}
}
return rc;
}
int sqlite3changeset_apply(
sqlite3 *db,
int nChangeset,
void *pChangeset,
int(*xConflict)(
void *pCtx, /* Copy of fifth arg to _apply() */
................................................................................
sqlite3_stmt *pDelete = 0; /* DELETE statement */
sqlite3_stmt *pUpdate = 0; /* DELETE statement */
sqlite3_stmt *pInsert = 0; /* INSERT statement */
sqlite3_stmt *pSelect = 0; /* SELECT statement */
rc = sqlite3_exec(db, "SAVEPOINT changeset_apply", 0, 0, 0);
if( rc!=SQLITE_OK ) return rc;
sqlite3changeset_start(&pIter, nChangeset, pChangeset);
while( SQLITE_ROW==sqlite3changeset_next(pIter) ){
int op;
const char *zThis;
sqlite3changeset_op(pIter, &zThis, &nCol, &op);
if( zTab==0 || sqlite3_strnicmp(zThis, zTab, nTab+1) ){
sqlite3_free(azCol);
................................................................................
nTab = strlen(zTab);
sqlite3_finalize(pDelete);
sqlite3_finalize(pUpdate);
sqlite3_finalize(pInsert);
sqlite3_finalize(pSelect);
pSelect = pUpdate = pInsert = pDelete = 0;
if( (rc = sessionSelectRow(db, zTab, nCol, azCol, abPK, &pSelect))
|| (rc = sessionUpdateRow(db, zTab, nCol, azCol, abPK, &pUpdate))
|| (rc = sessionDeleteRow(db, zTab, nCol, azCol, abPK, &pDelete))
){
break;
}
}
if( op==SQLITE_DELETE ){
int res;
int i;
rc = sessionDeleteRow(db, zTab, nCol, azCol, abPK, &pDelete);
for(i=0; rc==SQLITE_OK && i<nCol; i++){
................................................................................
rc = sqlite3changeset_old(pIter, i, &pOld);
if( rc==SQLITE_OK ){
rc = sqlite3changeset_new(pIter, i, &pNew);
}
if( rc==SQLITE_OK ){
if( pOld ) sqlite3_bind_value(pUpdate, i*3+1, pOld);
sqlite3_bind_int(pUpdate, i*3+2, !!pNew);
if( pNew ) sqlite3_bind_value(pUpdate, i*3+3, pNew);
}
}
if( rc==SQLITE_OK ) rc = sqlite3_bind_int(pUpdate, nCol*3+1, 0);
if( rc!=SQLITE_OK ) break;
sqlite3_step(pUpdate);
rc = sqlite3_reset(pUpdate);
................................................................................
}else{
rc = sqlite3_reset(pSelect);
if( rc==SQLITE_OK ){
res = xConflict(pCtx, SQLITE_CHANGESET_NOTFOUND, pIter);
}
}
}else if( rc==SQLITE_CONSTRAINT ){
/* This may be a CONSTRAINT or CONFLICT error. It is a CONFLICT if
** the only problem is a duplicate PRIMARY KEY, or a CONSTRAINT
** otherwise. */
int bPKChange = 0;
/* Check if the PK has been modified. */
rc = SQLITE_OK;
for(i=0; i<nCol && rc==SQLITE_OK; i++){
if( abPK[i] ){
sqlite3_value *pNew;
rc = sqlite3changeset_new(pIter, i, &pNew);
if( rc==SQLITE_OK && pNew ){
bPKChange = 1;
break;
}
}
}
if( bPKChange ){
/* See if there exists a row with a duplicate primary key. */
rc = sessionConstraintConflict(
db, pIter, abPK, pSelect, xConflict, pCtx
);
}else{
res = xConflict(pCtx, SQLITE_CHANGESET_CONSTRAINT, pIter);
}
}
}else{
int i;
assert( op==SQLITE_INSERT );
if( pInsert==0 ){
SessionBuffer buf = {0, 0, 0};
................................................................................
}
}
if( rc!=SQLITE_OK ) break;
sqlite3_step(pInsert);
rc = sqlite3_reset(pInsert);
if( rc==SQLITE_CONSTRAINT && xConflict ){
rc = sessionConstraintConflict(
db, pIter, abPK, pSelect, xConflict, pCtx
);
}
}
}
rc2 = sqlite3changeset_finalize(pIter);
if( rc==SQLITE_DONE ) rc = rc2;
if( rc==SQLITE_OK ){
|
Changes to test/session1.test.
255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 |
# Test UPDATE changesets.
#
do_execsql_test 3.3.1 {
CREATE TABLE t4(a, b, c, PRIMARY KEY(b, c));
INSERT INTO t4 VALUES(1, 2, 3);
INSERT INTO t4 VALUES(4, 5, 6);
}
do_db2_test 3.3.2 {
CREATE TABLE t4(a, b, c, PRIMARY KEY(b, c));
INSERT INTO t4 VALUES(0, 2, 3);
INSERT INTO t4 VALUES(4, 5, 7);
}
do_conflict_test 3.2.3 -tables t4 -sql {
UPDATE t4 SET a = -1 WHERE b = 2;
} -conflicts {
{UPDATE t4 DATA {i 1 i 2 i 3} {i -1 i 2 i 3} {i 0 i 2 i 3}}
}
do_db2_test 3.3.4 {
SELECT * FROM t4
} {0 2 3 4 5 7}
catch { db2 close }
finish_test
|
> > | > > < | > > > | > > < | < > |
255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 |
# Test UPDATE changesets.
#
do_execsql_test 3.3.1 {
CREATE TABLE t4(a, b, c, PRIMARY KEY(b, c));
INSERT INTO t4 VALUES(1, 2, 3);
INSERT INTO t4 VALUES(4, 5, 6);
INSERT INTO t4 VALUES(7, 8, 9);
INSERT INTO t4 VALUES(10, 11, 12);
}
do_db2_test 3.3.2 {
CREATE TABLE t4(a NOT NULL, b, c, PRIMARY KEY(b, c));
INSERT INTO t4 VALUES(0, 2, 3);
INSERT INTO t4 VALUES(4, 5, 7);
INSERT INTO t4 VALUES(7, 8, 9);
INSERT INTO t4 VALUES(10, 11, 12);
}
do_conflict_test 3.3.3 -tables t4 -sql {
UPDATE t4 SET a = -1 WHERE b = 2;
UPDATE t4 SET a = -1 WHERE b = 5;
UPDATE t4 SET a = NULL WHERE c = 9;
UPDATE t4 SET a = 'x' WHERE b = 11;
} -conflicts {
{UPDATE t4 DATA {i 1 i 2 i 3} {i -1 {} {} {} {}} {i 0 i 2 i 3}}
{UPDATE t4 NOTFOUND {i 4 i 5 i 6} {i -1 {} {} {} {}}}
{UPDATE t4 CONSTRAINT {i 7 i 8 i 9} {n {} {} {} {} {}}}
}
do_db2_test 3.3.4 { SELECT * FROM t4 } {0 2 3 4 5 7 7 8 9 x 11 12}
do_execsql_test 3.3.5 { SELECT * FROM t4 } {-1 2 3 -1 5 6 {} 8 9 x 11 12}
catch { db2 close }
finish_test
|