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-rw-r--r--src/update.c75
1 files changed, 36 insertions, 39 deletions
diff --git a/src/update.c b/src/update.c
index d355d7153..3e42461cd 100644
--- a/src/update.c
+++ b/src/update.c
@@ -101,6 +101,7 @@ void sqlite3Update(
Index *pIdx; /* For looping over indices */
Index *pPk; /* The PRIMARY KEY index for WITHOUT ROWID tables */
int nIdx; /* Number of indices that need updating */
+ int iBaseCur; /* Base cursor number */
int iDataCur; /* Cursor for the canonical data btree */
int iIdxCur; /* Cursor for the first index */
sqlite3 *db; /* The database structure */
@@ -108,11 +109,11 @@ void sqlite3Update(
int *aXRef = 0; /* aXRef[i] is the index in pChanges->a[] of the
** an expression for the i-th column of the table.
** aXRef[i]==-1 if the i-th column is not changed. */
+ u8 *aToOpen; /* 1 for tables and indices to be opened */
u8 chngPk; /* PRIMARY KEY changed in a WITHOUT ROWID table */
u8 chngRowid; /* Rowid changed in a normal table */
u8 chngKey; /* Either chngPk or chngRowid */
Expr *pRowidExpr = 0; /* Expression defining the new record number */
- int openAll = 0; /* True if all indices need to be opened */
AuthContext sContext; /* The authorization context */
NameContext sNC; /* The name-context to resolve expressions in */
int iDb; /* Database containing the table being updated */
@@ -176,16 +177,13 @@ void sqlite3Update(
if( sqlite3IsReadOnly(pParse, pTab, tmask) ){
goto update_cleanup;
}
- aXRef = sqlite3DbMallocRaw(db, sizeof(int) * pTab->nCol );
- if( aXRef==0 ) goto update_cleanup;
- for(i=0; i<pTab->nCol; i++) aXRef[i] = -1;
/* Allocate a cursors for the main database table and for all indices.
** The index cursors might not be used, but if they are used they
** need to occur right after the database cursor. So go ahead and
** allocate enough space, just in case.
*/
- pTabList->a[0].iCursor = iDataCur = pParse->nTab++;
+ pTabList->a[0].iCursor = iBaseCur = iDataCur = pParse->nTab++;
iIdxCur = iDataCur+1;
pPk = HasRowid(pTab) ? 0 : sqlite3PrimaryKeyIndex(pTab);
for(nIdx=0, pIdx=pTab->pIndex; pIdx; pIdx=pIdx->pNext, nIdx++){
@@ -196,6 +194,17 @@ void sqlite3Update(
pParse->nTab++;
}
+ /* Allocate space for aXRef[], aRegIdx[], and aToOpen[].
+ ** Initialize aXRef[] and aToOpen[] to their default values.
+ */
+ aXRef = sqlite3DbMallocRaw(db, sizeof(int) * (pTab->nCol+nIdx) + nIdx+2 );
+ if( aXRef==0 ) goto update_cleanup;
+ aRegIdx = aXRef+pTab->nCol;
+ aToOpen = (u8*)(aRegIdx+nIdx);
+ memset(aToOpen, 1, nIdx+1);
+ aToOpen[nIdx+1] = 0;
+ for(i=0; i<pTab->nCol; i++) aXRef[i] = -1;
+
/* Initialize the name-context */
memset(&sNC, 0, sizeof(sNC));
sNC.pParse = pParse;
@@ -254,17 +263,17 @@ void sqlite3Update(
assert( chngPk==0 || chngPk==1 );
chngKey = chngRowid + chngPk;
+ /* The SET expressions are not actually used inside the WHERE loop.
+ ** So reset the colUsed mask
+ */
+ pTabList->a[0].colUsed = 0;
+
hasFK = sqlite3FkRequired(pParse, pTab, aXRef, chngKey);
- /* Allocate memory for the array aRegIdx[]. There is one entry in the
- ** array for each index associated with table being updated. Fill in
- ** the value with a register number for indices that are to be used
- ** and with zero for unused indices.
+ /* There is one entry in the aRegIdx[] array for each index on the table
+ ** being updated. Fill in aRegIdx[] with a register number that will hold
+ ** the key for accessing each index.
*/
- if( nIdx>0 ){
- aRegIdx = sqlite3DbMallocRaw(db, sizeof(Index*) * nIdx );
- if( aRegIdx==0 ) goto update_cleanup;
- }
for(j=0, pIdx=pTab->pIndex; pIdx; pIdx=pIdx->pNext, j++){
int reg;
if( chngKey || hasFK || pIdx->pPartIdxWhere || pIdx==pPk ){
@@ -278,6 +287,7 @@ void sqlite3Update(
}
}
}
+ if( reg==0 ) aToOpen[j+1] = 0;
aRegIdx[j] = reg;
}
@@ -401,42 +411,30 @@ void sqlite3Update(
** action, then we need to open all indices because we might need
** to be deleting some records.
*/
- if( !okOnePass && HasRowid(pTab) ){
- sqlite3OpenTable(pParse, iDataCur, iDb, pTab, OP_OpenWrite);
- }
- sqlite3TableLock(pParse, iDb, pTab->tnum, 1, pTab->zName);
if( onError==OE_Replace ){
- openAll = 1;
+ memset(aToOpen, 1, nIdx+1);
}else{
- openAll = 0;
for(pIdx=pTab->pIndex; pIdx; pIdx=pIdx->pNext){
if( pIdx->onError==OE_Replace ){
- openAll = 1;
+ memset(aToOpen, 1, nIdx+1);
break;
}
}
}
- for(i=0, pIdx=pTab->pIndex; pIdx; pIdx=pIdx->pNext, i++){
- int iThisCur = iIdxCur+i;
- assert( aRegIdx );
- if( (openAll || aRegIdx[i]>0)
- && iThisCur!=aiCurOnePass[1]
- ){
- assert( iThisCur!=aiCurOnePass[0] );
- sqlite3VdbeAddOp3(v, OP_OpenWrite, iThisCur, pIdx->tnum, iDb);
- sqlite3VdbeSetP4KeyInfo(pParse, pIdx);
- assert( pParse->nTab>iThisCur );
- VdbeComment((v, "%s", pIdx->zName));
- if( okOnePass && pPk && iThisCur==iDataCur ){
- sqlite3VdbeAddOp4Int(v, OP_NotFound, iDataCur, labelBreak,
- regKey, nKey);
- }
- }
+ if( okOnePass ){
+ if( aiCurOnePass[0]>=0 ) aToOpen[aiCurOnePass[0]-iBaseCur] = 0;
+ if( aiCurOnePass[1]>=0 ) aToOpen[aiCurOnePass[1]-iBaseCur] = 0;
}
+ sqlite3OpenTableAndIndices(pParse, pTab, OP_OpenWrite, iBaseCur, aToOpen,
+ 0, 0);
}
/* Top of the update loop */
if( okOnePass ){
+ if( aToOpen[iDataCur-iBaseCur] ){
+ assert( pPk!=0 );
+ sqlite3VdbeAddOp4Int(v, OP_NotFound, iDataCur, labelBreak, regKey, nKey);
+ }
labelContinue = labelBreak;
sqlite3VdbeAddOp2(v, OP_IsNull, pPk ? regKey : regOldRowid, labelBreak);
}else if( pPk ){
@@ -642,7 +640,7 @@ void sqlite3Update(
/* Close all tables */
for(i=0, pIdx=pTab->pIndex; pIdx; pIdx=pIdx->pNext, i++){
assert( aRegIdx );
- if( openAll || aRegIdx[i]>0 ){
+ if( aToOpen[i+1] ){
sqlite3VdbeAddOp2(v, OP_Close, iIdxCur+i, 0);
}
}
@@ -669,8 +667,7 @@ void sqlite3Update(
update_cleanup:
sqlite3AuthContextPop(&sContext);
- sqlite3DbFree(db, aRegIdx);
- sqlite3DbFree(db, aXRef);
+ sqlite3DbFree(db, aXRef); /* Also frees aRegIdx[] and aToOpen[] */
sqlite3SrcListDelete(db, pTabList);
sqlite3ExprListDelete(db, pChanges);
sqlite3ExprDelete(db, pWhere);
generated by cgit v1.2.3 (git 2.25.1) at 2025-07-18 21:49:15 +0000