SQLite

    /* Loop over the primary keys to be deleted. */
    addr = sqlite3VdbeAddOp1(v, OP_Rewind, iEph);
    sqlite3VdbeAddOp2(v, OP_RowKey, iEph, iPk);

    /* Delete the row */
    sqlite3GenerateRowDelete(pParse, pTab, pTrigger, iDataCur, iIdxCur,
                             iPk, 0, 1, OE_Default, 0);

    /* End of the delete loop */
    sqlite3VdbeAddOp2(v, OP_Next, iEph, addr+1);
    sqlite3VdbeJumpHere(v, addr);

    /* Close the cursors open on the table and its indexes. */
    assert( iDataCur>=iIdxCur );

      sqlite3VdbeChangeP5(v, OE_Abort);
      sqlite3MayAbort(pParse);
    }else
#endif
    {
      int count = (pParse->nested==0);    /* True to count changes */
      sqlite3GenerateRowDelete(pParse, pTab, pTrigger, iDataCur, iIdxCur,
                               iRowid, 1, count, OE_Default, 0);
    }

    /* End of the delete loop */
    sqlite3VdbeAddOp2(v, OP_Goto, 0, addr);
    sqlite3VdbeResolveLabel(v, end);

    /* Close the cursors open on the table and its indexes. */

  Table *pTab,       /* Table containing the row to be deleted */
  Trigger *pTrigger, /* List of triggers to (potentially) fire */
  int iDataCur,      /* Cursor from which column data is extracted */
  int iIdxCur,       /* First index cursor */
  int iPk,           /* First memory cell containing the PRIMARY KEY */
  i16 nPk,           /* Number of PRIMARY KEY memory cells */
  u8 count,          /* If non-zero, increment the row change counter */
  u8 onconf,         /* Default ON CONFLICT policy for triggers */
  u8 bNoSeek         /* iDataCur is already pointing to the row to delete */
){
  Vdbe *v = pParse->pVdbe;        /* Vdbe */
  int iOld = 0;                   /* First register in OLD.* array */
  int iLabel;                     /* Label resolved to end of generated code */
  u8 opSeek;                      /* Seek opcode */

  /* Vdbe is guaranteed to have been allocated by this stage. */
  assert( v );
  VdbeModuleComment((v, "BEGIN: GenRowDel(%d,%d,%d,%d)",
                         iDataCur, iIdxCur, iPk, (int)nPk));

  /* Seek cursor iCur to the row to delete. If this row no longer exists 
  ** (this can happen if a trigger program has already deleted it), do
  ** not attempt to delete it or fire any DELETE triggers.  */
  iLabel = sqlite3VdbeMakeLabel(v);
  opSeek = HasRowid(pTab) ? OP_NotExists : OP_NotFound;
  if( !bNoSeek ) sqlite3VdbeAddOp4Int(v, opSeek, iDataCur, iLabel, iPk, nPk);
 
  /* If there are any triggers to fire, allocate a range of registers to
  ** use for the old.* references in the triggers.  */
  if( sqlite3FkRequired(pParse, pTab, 0, 0) || pTrigger ){
    u32 mask;                     /* Mask of OLD.* columns in use */
    int iCol;                     /* Iterator used while populating OLD.* */

  int r1;            /* Register holding an index key */
  int iPartIdxLabel; /* Jump destination for skipping partial index entries */
  Index *pIdx;       /* Current index */
  Vdbe *v;           /* The prepared statement under construction */
  Index *pPk;        /* PRIMARY KEY index, or NULL for rowid tables */

  v = pParse->pVdbe;

  pPk = HasRowid(pTab) ? 0 : sqlite3PrimaryKeyIndex(pTab);
  for(i=0, pIdx=pTab->pIndex; pIdx; i++, pIdx=pIdx->pNext){
    assert( iIdxCur+i!=iDataCur || pPk==pIdx );
    if( aRegIdx!=0 && aRegIdx[i]==0 ) continue;
    if( pIdx==pPk ) continue;
    VdbeModuleComment((v, "GenRowIdxDel for %s", pIdx->zName));
    r1 = sqlite3GenerateIndexKey(pParse, pIdx, iDataCur, 0, 1, &iPartIdxLabel);
    sqlite3VdbeAddOp3(v, OP_IdxDelete, iIdxCur+i, r1,
                      pIdx->uniqNotNull ? pIdx->nKeyCol : pIdx->nColumn);
    sqlite3VdbeResolveLabel(v, iPartIdxLabel);
  }

}

/*
** Generate code that will assemble an index key and stores it in register
** regOut.  The key with be for index pIdx which is an index on pTab.
** iCur is the index of a cursor open on the pTab table and pointing to
** the entry that needs indexing.  If pTab is a WITHOUT ROWID table, then

        Trigger *pTrigger = 0;
        if( db->flags&SQLITE_RecTriggers ){
          pTrigger = sqlite3TriggersExist(pParse, pTab, TK_DELETE, 0, 0);
        }
        if( pTrigger || sqlite3FkRequired(pParse, pTab, 0, 0) ){
          sqlite3MultiWrite(pParse);
          sqlite3GenerateRowDelete(pParse, pTab, pTrigger, iDataCur, iIdxCur,
                                   regNewData, 1, 0, OE_Replace, 1);
        }else if( pTab->pIndex ){
          sqlite3MultiWrite(pParse);
          sqlite3GenerateRowIndexDelete(pParse, pTab, iDataCur, iIdxCur, 0);
        }
        seenReplace = 1;
        break;
      }

    if( overrideError!=OE_Default ){
      onError = overrideError;
    }else if( onError==OE_Default ){
      onError = OE_Abort;
    }
    
    /* Check to see if the new index entry will be unique */

    sqlite3VdbeAddOp4Int(v, OP_NoConflict, iThisCur, addrUniqueOk,
                         regIdx, pIdx->nKeyCol);

    /* Generate code to handle collisions */
    regR = (pIdx==pPk) ? regIdx : sqlite3GetTempRange(pParse, nPkField);
    if( HasRowid(pTab) ){
      sqlite3VdbeAddOp2(v, OP_IdxRowid, iThisCur, regR);
      /* Conflict only if the rowid of the existing index entry
      ** is different from old-rowid */
      if( isUpdate ){
        sqlite3VdbeAddOp3(v, OP_Eq, regR, addrUniqueOk, regOldData);
      }
    }else{
      int x;
      /* Extract the PRIMARY KEY from the end of the index entry and
      ** store it in registers regR..regR+nPk-1 */
      if( (isUpdate || onError==OE_Replace) && pIdx!=pPk ){
        for(i=0; i<pPk->nKeyCol; i++){
          x = sqlite3ColumnOfIndex(pIdx, pPk->aiColumn[i]);
          sqlite3VdbeAddOp3(v, OP_Column, iThisCur, x, regR+i);
          VdbeComment((v, "%s.%s", pTab->zName,
                       pTab->aCol[pPk->aiColumn[i]].zName));
        }
      }

          }
          sqlite3VdbeAddOp4(v, op, 
              regOldData+1+x, addrJump, regCmp+i, p4, P4_COLLSEQ
          );
        }
      }
    }


    /* Generate code that executes if the new index entry is not unique */
    assert( onError==OE_Rollback || onError==OE_Abort || onError==OE_Fail
        || onError==OE_Ignore || onError==OE_Replace );
    switch( onError ){
      case OE_Rollback:
      case OE_Abort:

        Trigger *pTrigger = 0;
        assert( onError==OE_Replace );
        sqlite3MultiWrite(pParse);
        if( db->flags&SQLITE_RecTriggers ){
          pTrigger = sqlite3TriggersExist(pParse, pTab, TK_DELETE, 0, 0);
        }
        sqlite3GenerateRowDelete(pParse, pTab, pTrigger, iDataCur, iIdxCur,
                                 regR, nPkField, 0, OE_Replace, pIdx==pPk);
        seenReplace = 1;
        break;
      }
    }
    sqlite3VdbeResolveLabel(v, addrUniqueOk);
    sqlite3ReleaseTempRange(pParse, regIdx, pIdx->nColumn);
    if( regR!=regIdx ) sqlite3ReleaseTempRange(pParse, regR, nPkField);
  }
  if( ipkTop ){
    sqlite3VdbeAddOp2(v, OP_Goto, 0, ipkTop+1);
    sqlite3VdbeJumpHere(v, ipkBottom);
  }
  
  if( pbMayReplace ){

int sqlite3ExprIsConstantNotJoin(Expr*);
int sqlite3ExprIsConstantOrFunction(Expr*);
int sqlite3ExprIsInteger(Expr*, int*);
int sqlite3ExprCanBeNull(const Expr*);
void sqlite3ExprCodeIsNullJump(Vdbe*, const Expr*, int, int);
int sqlite3ExprNeedsNoAffinityChange(const Expr*, char);
int sqlite3IsRowid(const char*);
void sqlite3GenerateRowDelete(Parse*,Table*,Trigger*,int,int,int,i16,u8,u8,u8);
void sqlite3GenerateRowIndexDelete(Parse*, Table*, int, int, int*);
int sqlite3GenerateIndexKey(Parse*, Index*, int, int, int, int*);
void sqlite3GenerateConstraintChecks(Parse*,Table*,int*,int,int,int,int,
                                     u8,u8,int,int*);
void sqlite3CompleteInsertion(Parse*,Table*,int,int,int,int*,int,int,int);
int sqlite3OpenTableAndIndices(Parse*, Table*, int, int, int*, int*);
void sqlite3BeginWriteOperation(Parse*, int, int);