diff -r 000000000000 -r 08ec8eefde2f persistentstorage/sqlite3api/SQLite/update.c --- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/persistentstorage/sqlite3api/SQLite/update.c Fri Jan 22 11:06:30 2010 +0200 @@ -0,0 +1,680 @@ +/* +** 2001 September 15 +** +** The author disclaims copyright to this source code. In place of +** a legal notice, here is a blessing: +** +** May you do good and not evil. +** May you find forgiveness for yourself and forgive others. +** May you share freely, never taking more than you give. +** +************************************************************************* +** This file contains C code routines that are called by the parser +** to handle UPDATE statements. +** +** $Id: update.c,v 1.184 2008/09/01 21:59:43 shane Exp $ +*/ +#include "sqliteInt.h" + +#ifndef SQLITE_OMIT_VIRTUALTABLE +/* Forward declaration */ +static void updateVirtualTable( + Parse *pParse, /* The parsing context */ + SrcList *pSrc, /* The virtual table to be modified */ + Table *pTab, /* The virtual table */ + ExprList *pChanges, /* The columns to change in the UPDATE statement */ + Expr *pRowidExpr, /* Expression used to recompute the rowid */ + int *aXRef, /* Mapping from columns of pTab to entries in pChanges */ + Expr *pWhere /* WHERE clause of the UPDATE statement */ +); +#endif /* SQLITE_OMIT_VIRTUALTABLE */ + +/* +** The most recently coded instruction was an OP_Column to retrieve the +** i-th column of table pTab. This routine sets the P4 parameter of the +** OP_Column to the default value, if any. +** +** The default value of a column is specified by a DEFAULT clause in the +** column definition. This was either supplied by the user when the table +** was created, or added later to the table definition by an ALTER TABLE +** command. If the latter, then the row-records in the table btree on disk +** may not contain a value for the column and the default value, taken +** from the P4 parameter of the OP_Column instruction, is returned instead. +** If the former, then all row-records are guaranteed to include a value +** for the column and the P4 value is not required. +** +** Column definitions created by an ALTER TABLE command may only have +** literal default values specified: a number, null or a string. (If a more +** complicated default expression value was provided, it is evaluated +** when the ALTER TABLE is executed and one of the literal values written +** into the sqlite_master table.) +** +** Therefore, the P4 parameter is only required if the default value for +** the column is a literal number, string or null. The sqlite3ValueFromExpr() +** function is capable of transforming these types of expressions into +** sqlite3_value objects. +*/ +void sqlite3ColumnDefault(Vdbe *v, Table *pTab, int i){ + if( pTab && !pTab->pSelect ){ + sqlite3_value *pValue; + u8 enc = ENC(sqlite3VdbeDb(v)); + Column *pCol = &pTab->aCol[i]; + VdbeComment((v, "%s.%s", pTab->zName, pCol->zName)); + assert( inCol ); + sqlite3ValueFromExpr(sqlite3VdbeDb(v), pCol->pDflt, enc, + pCol->affinity, &pValue); + if( pValue ){ + sqlite3VdbeChangeP4(v, -1, (const char *)pValue, P4_MEM); + } + } +} + +/* +** Process an UPDATE statement. +** +** UPDATE OR IGNORE table_wxyz SET a=b, c=d WHERE e<5 AND f NOT NULL; +** \_______/ \________/ \______/ \________________/ +* onError pTabList pChanges pWhere +*/ +void sqlite3Update( + Parse *pParse, /* The parser context */ + SrcList *pTabList, /* The table in which we should change things */ + ExprList *pChanges, /* Things to be changed */ + Expr *pWhere, /* The WHERE clause. May be null */ + int onError /* How to handle constraint errors */ +){ + int i, j; /* Loop counters */ + Table *pTab; /* The table to be updated */ + int addr = 0; /* VDBE instruction address of the start of the loop */ + WhereInfo *pWInfo; /* Information about the WHERE clause */ + Vdbe *v; /* The virtual database engine */ + Index *pIdx; /* For looping over indices */ + int nIdx; /* Number of indices that need updating */ + int iCur; /* VDBE Cursor number of pTab */ + sqlite3 *db; /* The database structure */ + int *aRegIdx = 0; /* One register assigned to each index to be updated */ + 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. */ + int chngRowid; /* True if the record number is being changed */ + 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 */ + int j1; /* Addresses of jump instructions */ + int okOnePass; /* True for one-pass algorithm without the FIFO */ + +#ifndef SQLITE_OMIT_TRIGGER + int isView; /* Trying to update a view */ + int triggers_exist = 0; /* True if any row triggers exist */ +#endif + int iBeginAfterTrigger; /* Address of after trigger program */ + int iEndAfterTrigger; /* Exit of after trigger program */ + int iBeginBeforeTrigger; /* Address of before trigger program */ + int iEndBeforeTrigger; /* Exit of before trigger program */ + u32 old_col_mask = 0; /* Mask of OLD.* columns in use */ + u32 new_col_mask = 0; /* Mask of NEW.* columns in use */ + + int newIdx = -1; /* index of trigger "new" temp table */ + int oldIdx = -1; /* index of trigger "old" temp table */ + + /* Register Allocations */ + int regRowCount = 0; /* A count of rows changed */ + int regOldRowid; /* The old rowid */ + int regNewRowid; /* The new rowid */ + int regData; /* New data for the row */ + + sContext.pParse = 0; + db = pParse->db; + if( pParse->nErr || db->mallocFailed ){ + goto update_cleanup; + } + assert( pTabList->nSrc==1 ); + + /* Locate the table which we want to update. + */ + pTab = sqlite3SrcListLookup(pParse, pTabList); + if( pTab==0 ) goto update_cleanup; + iDb = sqlite3SchemaToIndex(pParse->db, pTab->pSchema); + + /* Figure out if we have any triggers and if the table being + ** updated is a view + */ +#ifndef SQLITE_OMIT_TRIGGER + triggers_exist = sqlite3TriggersExist(pParse, pTab, TK_UPDATE, pChanges); + isView = pTab->pSelect!=0; +#else +# define triggers_exist 0 +# define isView 0 +#endif +#ifdef SQLITE_OMIT_VIEW +# undef isView +# define isView 0 +#endif + + if( sqlite3IsReadOnly(pParse, pTab, triggers_exist) ){ + goto update_cleanup; + } + if( sqlite3ViewGetColumnNames(pParse, pTab) ){ + goto update_cleanup; + } + aXRef = sqlite3DbMallocRaw(db, sizeof(int) * pTab->nCol ); + if( aXRef==0 ) goto update_cleanup; + for(i=0; inCol; i++) aXRef[i] = -1; + + /* If there are FOR EACH ROW triggers, allocate cursors for the + ** special OLD and NEW tables + */ + if( triggers_exist ){ + newIdx = pParse->nTab++; + oldIdx = pParse->nTab++; + } + + /* 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 = iCur = pParse->nTab++; + for(pIdx=pTab->pIndex; pIdx; pIdx=pIdx->pNext){ + pParse->nTab++; + } + + /* Initialize the name-context */ + memset(&sNC, 0, sizeof(sNC)); + sNC.pParse = pParse; + sNC.pSrcList = pTabList; + + /* Resolve the column names in all the expressions of the + ** of the UPDATE statement. Also find the column index + ** for each column to be updated in the pChanges array. For each + ** column to be updated, make sure we have authorization to change + ** that column. + */ + chngRowid = 0; + for(i=0; inExpr; i++){ + if( sqlite3ResolveExprNames(&sNC, pChanges->a[i].pExpr) ){ + goto update_cleanup; + } + for(j=0; jnCol; j++){ + if( sqlite3StrICmp(pTab->aCol[j].zName, pChanges->a[i].zName)==0 ){ + if( j==pTab->iPKey ){ + chngRowid = 1; + pRowidExpr = pChanges->a[i].pExpr; + } + aXRef[j] = i; + break; + } + } + if( j>=pTab->nCol ){ + if( sqlite3IsRowid(pChanges->a[i].zName) ){ + chngRowid = 1; + pRowidExpr = pChanges->a[i].pExpr; + }else{ + sqlite3ErrorMsg(pParse, "no such column: %s", pChanges->a[i].zName); + goto update_cleanup; + } + } +#ifndef SQLITE_OMIT_AUTHORIZATION + { + int rc; + rc = sqlite3AuthCheck(pParse, SQLITE_UPDATE, pTab->zName, + pTab->aCol[j].zName, db->aDb[iDb].zName); + if( rc==SQLITE_DENY ){ + goto update_cleanup; + }else if( rc==SQLITE_IGNORE ){ + aXRef[j] = -1; + } + } +#endif + } + + /* 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. + */ + for(nIdx=0, pIdx=pTab->pIndex; pIdx; pIdx=pIdx->pNext, nIdx++){} + 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( chngRowid ){ + reg = ++pParse->nMem; + }else{ + reg = 0; + for(i=0; inColumn; i++){ + if( aXRef[pIdx->aiColumn[i]]>=0 ){ + reg = ++pParse->nMem; + break; + } + } + } + aRegIdx[j] = reg; + } + + /* Allocate a block of register used to store the change record + ** sent to sqlite3GenerateConstraintChecks(). There are either + ** one or two registers for holding the rowid. One rowid register + ** is used if chngRowid is false and two are used if chngRowid is + ** true. Following these are pTab->nCol register holding column + ** data. + */ + regOldRowid = regNewRowid = pParse->nMem + 1; + pParse->nMem += pTab->nCol + 1; + if( chngRowid ){ + regNewRowid++; + pParse->nMem++; + } + regData = regNewRowid+1; + + + /* Begin generating code. + */ + v = sqlite3GetVdbe(pParse); + if( v==0 ) goto update_cleanup; + if( pParse->nested==0 ) sqlite3VdbeCountChanges(v); + sqlite3BeginWriteOperation(pParse, 1, iDb); + +#ifndef SQLITE_OMIT_VIRTUALTABLE + /* Virtual tables must be handled separately */ + if( IsVirtual(pTab) ){ + updateVirtualTable(pParse, pTabList, pTab, pChanges, pRowidExpr, aXRef, + pWhere); + pWhere = 0; + pTabList = 0; + goto update_cleanup; + } +#endif + + /* Start the view context + */ + if( isView ){ + sqlite3AuthContextPush(pParse, &sContext, pTab->zName); + } + + /* Generate the code for triggers. + */ + if( triggers_exist ){ + int iGoto; + + /* Create pseudo-tables for NEW and OLD + */ + sqlite3VdbeAddOp2(v, OP_SetNumColumns, 0, pTab->nCol); + sqlite3VdbeAddOp2(v, OP_OpenPseudo, oldIdx, 0); + sqlite3VdbeAddOp2(v, OP_SetNumColumns, 0, pTab->nCol); + sqlite3VdbeAddOp2(v, OP_OpenPseudo, newIdx, 0); + + iGoto = sqlite3VdbeAddOp2(v, OP_Goto, 0, 0); + addr = sqlite3VdbeMakeLabel(v); + iBeginBeforeTrigger = sqlite3VdbeCurrentAddr(v); + if( sqlite3CodeRowTrigger(pParse, TK_UPDATE, pChanges, TRIGGER_BEFORE, pTab, + newIdx, oldIdx, onError, addr, &old_col_mask, &new_col_mask) ){ + goto update_cleanup; + } + iEndBeforeTrigger = sqlite3VdbeAddOp2(v, OP_Goto, 0, 0); + iBeginAfterTrigger = sqlite3VdbeCurrentAddr(v); + if( sqlite3CodeRowTrigger(pParse, TK_UPDATE, pChanges, TRIGGER_AFTER, pTab, + newIdx, oldIdx, onError, addr, &old_col_mask, &new_col_mask) ){ + goto update_cleanup; + } + iEndAfterTrigger = sqlite3VdbeAddOp2(v, OP_Goto, 0, 0); + sqlite3VdbeJumpHere(v, iGoto); + } + + /* If we are trying to update a view, realize that view into + ** a ephemeral table. + */ +#if !defined(SQLITE_OMIT_VIEW) && !defined(SQLITE_OMIT_TRIGGER) + if( isView ){ + sqlite3MaterializeView(pParse, pTab, pWhere, iCur); + } +#endif + + /* Resolve the column names in all the expressions in the + ** WHERE clause. + */ + if( sqlite3ResolveExprNames(&sNC, pWhere) ){ + goto update_cleanup; + } + + /* Begin the database scan + */ + sqlite3VdbeAddOp2(v, OP_Null, 0, regOldRowid); + pWInfo = sqlite3WhereBegin(pParse, pTabList, pWhere, 0, + WHERE_ONEPASS_DESIRED); + if( pWInfo==0 ) goto update_cleanup; + okOnePass = pWInfo->okOnePass; + + /* Remember the rowid of every item to be updated. + */ + sqlite3VdbeAddOp2(v, IsVirtual(pTab)?OP_VRowid:OP_Rowid, iCur, regOldRowid); + if( !okOnePass ) sqlite3VdbeAddOp2(v, OP_FifoWrite, regOldRowid, 0); + + /* End the database scan loop. + */ + sqlite3WhereEnd(pWInfo); + + /* Initialize the count of updated rows + */ + if( db->flags & SQLITE_CountRows && !pParse->trigStack ){ + regRowCount = ++pParse->nMem; + sqlite3VdbeAddOp2(v, OP_Integer, 0, regRowCount); + } + + if( !isView && !IsVirtual(pTab) ){ + /* + ** Open every index that needs updating. Note that if any + ** index could potentially invoke a REPLACE conflict resolution + ** action, then we need to open all indices because we might need + ** to be deleting some records. + */ + if( !okOnePass ) sqlite3OpenTable(pParse, iCur, iDb, pTab, OP_OpenWrite); + if( onError==OE_Replace ){ + openAll = 1; + }else{ + openAll = 0; + for(pIdx=pTab->pIndex; pIdx; pIdx=pIdx->pNext){ + if( pIdx->onError==OE_Replace ){ + openAll = 1; + break; + } + } + } + for(i=0, pIdx=pTab->pIndex; pIdx; pIdx=pIdx->pNext, i++){ + if( openAll || aRegIdx[i]>0 ){ + KeyInfo *pKey = sqlite3IndexKeyinfo(pParse, pIdx); + sqlite3VdbeAddOp4(v, OP_OpenWrite, iCur+i+1, pIdx->tnum, iDb, + (char*)pKey, P4_KEYINFO_HANDOFF); + assert( pParse->nTab>iCur+i+1 ); + } + } + } + + /* Jump back to this point if a trigger encounters an IGNORE constraint. */ + if( triggers_exist ){ + sqlite3VdbeResolveLabel(v, addr); + } + + /* Top of the update loop */ + if( okOnePass ){ + int a1 = sqlite3VdbeAddOp1(v, OP_NotNull, regOldRowid); + addr = sqlite3VdbeAddOp0(v, OP_Goto); + sqlite3VdbeJumpHere(v, a1); + }else{ + addr = sqlite3VdbeAddOp2(v, OP_FifoRead, regOldRowid, 0); + } + + if( triggers_exist ){ + int regRowid; + int regRow; + int regCols; + + /* Make cursor iCur point to the record that is being updated. + */ + sqlite3VdbeAddOp3(v, OP_NotExists, iCur, addr, regOldRowid); + + /* Generate the OLD table + */ + regRowid = sqlite3GetTempReg(pParse); + regRow = sqlite3GetTempReg(pParse); + sqlite3VdbeAddOp2(v, OP_Rowid, iCur, regRowid); + if( !old_col_mask ){ + sqlite3VdbeAddOp2(v, OP_Null, 0, regRow); + }else{ + sqlite3VdbeAddOp2(v, OP_RowData, iCur, regRow); + } + sqlite3VdbeAddOp3(v, OP_Insert, oldIdx, regRow, regRowid); + + /* Generate the NEW table + */ + if( chngRowid ){ + sqlite3ExprCodeAndCache(pParse, pRowidExpr, regRowid); + }else{ + sqlite3VdbeAddOp2(v, OP_Rowid, iCur, regRowid); + } + regCols = sqlite3GetTempRange(pParse, pTab->nCol); + for(i=0; inCol; i++){ + if( i==pTab->iPKey ){ + sqlite3VdbeAddOp2(v, OP_Null, 0, regCols+i); + continue; + } + j = aXRef[i]; + if( new_col_mask&((u32)1<a[j].pExpr, regCols+i); + } + }else{ + sqlite3VdbeAddOp2(v, OP_Null, 0, regCols+i); + } + } + sqlite3VdbeAddOp3(v, OP_MakeRecord, regCols, pTab->nCol, regRow); + if( !isView ){ + sqlite3TableAffinityStr(v, pTab); + sqlite3ExprCacheAffinityChange(pParse, regCols, pTab->nCol); + } + sqlite3ReleaseTempRange(pParse, regCols, pTab->nCol); + /* if( pParse->nErr ) goto update_cleanup; */ + sqlite3VdbeAddOp3(v, OP_Insert, newIdx, regRow, regRowid); + sqlite3ReleaseTempReg(pParse, regRowid); + sqlite3ReleaseTempReg(pParse, regRow); + + sqlite3VdbeAddOp2(v, OP_Goto, 0, iBeginBeforeTrigger); + sqlite3VdbeJumpHere(v, iEndBeforeTrigger); + } + + if( !isView && !IsVirtual(pTab) ){ + /* Loop over every record that needs updating. We have to load + ** the old data for each record to be updated because some columns + ** might not change and we will need to copy the old value. + ** Also, the old data is needed to delete the old index entries. + ** So make the cursor point at the old record. + */ + sqlite3VdbeAddOp3(v, OP_NotExists, iCur, addr, regOldRowid); + + /* If the record number will change, push the record number as it + ** will be after the update. (The old record number is currently + ** on top of the stack.) + */ + if( chngRowid ){ + sqlite3ExprCode(pParse, pRowidExpr, regNewRowid); + sqlite3VdbeAddOp1(v, OP_MustBeInt, regNewRowid); + } + + /* Compute new data for this record. + */ + for(i=0; inCol; i++){ + if( i==pTab->iPKey ){ + sqlite3VdbeAddOp2(v, OP_Null, 0, regData+i); + continue; + } + j = aXRef[i]; + if( j<0 ){ + sqlite3VdbeAddOp3(v, OP_Column, iCur, i, regData+i); + sqlite3ColumnDefault(v, pTab, i); + }else{ + sqlite3ExprCode(pParse, pChanges->a[j].pExpr, regData+i); + } + } + + /* Do constraint checks + */ + sqlite3GenerateConstraintChecks(pParse, pTab, iCur, regNewRowid, + aRegIdx, chngRowid, 1, + onError, addr); + + /* Delete the old indices for the current record. + */ + j1 = sqlite3VdbeAddOp3(v, OP_NotExists, iCur, 0, regOldRowid); + sqlite3GenerateRowIndexDelete(pParse, pTab, iCur, aRegIdx); + + /* If changing the record number, delete the old record. + */ + if( chngRowid ){ + sqlite3VdbeAddOp2(v, OP_Delete, iCur, 0); + } + sqlite3VdbeJumpHere(v, j1); + + /* Create the new index entries and the new record. + */ + sqlite3CompleteInsertion(pParse, pTab, iCur, regNewRowid, + aRegIdx, chngRowid, 1, -1, 0); + } + + /* Increment the row counter + */ + if( db->flags & SQLITE_CountRows && !pParse->trigStack){ + sqlite3VdbeAddOp2(v, OP_AddImm, regRowCount, 1); + } + + /* If there are triggers, close all the cursors after each iteration + ** through the loop. The fire the after triggers. + */ + if( triggers_exist ){ + sqlite3VdbeAddOp2(v, OP_Goto, 0, iBeginAfterTrigger); + sqlite3VdbeJumpHere(v, iEndAfterTrigger); + } + + /* Repeat the above with the next record to be updated, until + ** all record selected by the WHERE clause have been updated. + */ + sqlite3VdbeAddOp2(v, OP_Goto, 0, addr); + sqlite3VdbeJumpHere(v, addr); + + /* Close all tables */ + for(i=0, pIdx=pTab->pIndex; pIdx; pIdx=pIdx->pNext, i++){ + if( openAll || aRegIdx[i]>0 ){ + sqlite3VdbeAddOp2(v, OP_Close, iCur+i+1, 0); + } + } + sqlite3VdbeAddOp2(v, OP_Close, iCur, 0); + if( triggers_exist ){ + sqlite3VdbeAddOp2(v, OP_Close, newIdx, 0); + sqlite3VdbeAddOp2(v, OP_Close, oldIdx, 0); + } + + /* + ** Return the number of rows that were changed. If this routine is + ** generating code because of a call to sqlite3NestedParse(), do not + ** invoke the callback function. + */ + if( db->flags & SQLITE_CountRows && !pParse->trigStack && pParse->nested==0 ){ + sqlite3VdbeAddOp2(v, OP_ResultRow, regRowCount, 1); + sqlite3VdbeSetNumCols(v, 1); + sqlite3VdbeSetColName(v, 0, COLNAME_NAME, "rows updated", P4_STATIC); + } + +update_cleanup: + sqlite3AuthContextPop(&sContext); + sqlite3DbFree(db, aRegIdx); + sqlite3DbFree(db, aXRef); + sqlite3SrcListDelete(db, pTabList); + sqlite3ExprListDelete(db, pChanges); + sqlite3ExprDelete(db, pWhere); + return; +} + +#ifndef SQLITE_OMIT_VIRTUALTABLE +/* +** Generate code for an UPDATE of a virtual table. +** +** The strategy is that we create an ephemerial table that contains +** for each row to be changed: +** +** (A) The original rowid of that row. +** (B) The revised rowid for the row. (note1) +** (C) The content of every column in the row. +** +** Then we loop over this ephemeral table and for each row in +** the ephermeral table call VUpdate. +** +** When finished, drop the ephemeral table. +** +** (note1) Actually, if we know in advance that (A) is always the same +** as (B) we only store (A), then duplicate (A) when pulling +** it out of the ephemeral table before calling VUpdate. +*/ +static void updateVirtualTable( + Parse *pParse, /* The parsing context */ + SrcList *pSrc, /* The virtual table to be modified */ + Table *pTab, /* The virtual table */ + ExprList *pChanges, /* The columns to change in the UPDATE statement */ + Expr *pRowid, /* Expression used to recompute the rowid */ + int *aXRef, /* Mapping from columns of pTab to entries in pChanges */ + Expr *pWhere /* WHERE clause of the UPDATE statement */ +){ + Vdbe *v = pParse->pVdbe; /* Virtual machine under construction */ + ExprList *pEList = 0; /* The result set of the SELECT statement */ + Select *pSelect = 0; /* The SELECT statement */ + Expr *pExpr; /* Temporary expression */ + int ephemTab; /* Table holding the result of the SELECT */ + int i; /* Loop counter */ + int addr; /* Address of top of loop */ + int iReg; /* First register in set passed to OP_VUpdate */ + sqlite3 *db = pParse->db; /* Database connection */ + const char *pVtab = (const char*)pTab->pVtab; + SelectDest dest; + + /* Construct the SELECT statement that will find the new values for + ** all updated rows. + */ + pEList = sqlite3ExprListAppend(pParse, 0, + sqlite3CreateIdExpr(pParse, "_rowid_"), 0); + if( pRowid ){ + pEList = sqlite3ExprListAppend(pParse, pEList, + sqlite3ExprDup(db, pRowid), 0); + } + assert( pTab->iPKey<0 ); + for(i=0; inCol; i++){ + if( aXRef[i]>=0 ){ + pExpr = sqlite3ExprDup(db, pChanges->a[aXRef[i]].pExpr); + }else{ + pExpr = sqlite3CreateIdExpr(pParse, pTab->aCol[i].zName); + } + pEList = sqlite3ExprListAppend(pParse, pEList, pExpr, 0); + } + pSelect = sqlite3SelectNew(pParse, pEList, pSrc, pWhere, 0, 0, 0, 0, 0, 0); + + /* Create the ephemeral table into which the update results will + ** be stored. + */ + assert( v ); + ephemTab = pParse->nTab++; + sqlite3VdbeAddOp2(v, OP_OpenEphemeral, ephemTab, pTab->nCol+1+(pRowid!=0)); + + /* fill the ephemeral table + */ + sqlite3SelectDestInit(&dest, SRT_Table, ephemTab); + sqlite3Select(pParse, pSelect, &dest); + + /* Generate code to scan the ephemeral table and call VUpdate. */ + iReg = ++pParse->nMem; + pParse->nMem += pTab->nCol+1; + sqlite3VdbeAddOp2(v, OP_Rewind, ephemTab, 0); + addr = sqlite3VdbeCurrentAddr(v); + sqlite3VdbeAddOp3(v, OP_Column, ephemTab, 0, iReg); + sqlite3VdbeAddOp3(v, OP_Column, ephemTab, (pRowid?1:0), iReg+1); + for(i=0; inCol; i++){ + sqlite3VdbeAddOp3(v, OP_Column, ephemTab, i+1+(pRowid!=0), iReg+2+i); + } + sqlite3VtabMakeWritable(pParse, pTab); + sqlite3VdbeAddOp4(v, OP_VUpdate, 0, pTab->nCol+2, iReg, pVtab, P4_VTAB); + sqlite3VdbeAddOp2(v, OP_Next, ephemTab, addr); + sqlite3VdbeJumpHere(v, addr-1); + sqlite3VdbeAddOp2(v, OP_Close, ephemTab, 0); + + /* Cleanup */ + sqlite3SelectDelete(db, pSelect); +} +#endif /* SQLITE_OMIT_VIRTUALTABLE */ + +/* Make sure "isView" gets undefined in case this file becomes part of +** the amalgamation - so that subsequent files do not see isView as a +** macro. */ +#undef isView