**
** Various scripts scan this source file in order to generate HTML
** documentation, headers files, or other derived files.  The formatting
** of the code in this file is, therefore, important.  See other comments
** in this file for details.  If in doubt, do not deviate from existing
** commenting and indentation practices when changing or adding code.
**
** $Id: vdbe.c,v 1.276 2004/05/11 02:10:07 danielk1977 Exp $
*/
#include "sqliteInt.h"
#include "os.h"
#include <ctype.h>
#include "vdbeInt.h"

/*
................................................................................
  if( rc==SQLITE_OK ){
    rc = sqlite3BtreeBeginTrans(pCx->pBt);
  }
  if( rc==SQLITE_OK ){
    /* If a transient index is required, create it by calling
    ** sqlite3BtreeCreateTable() with the BTREE_ZERODATA flag before
    ** opening it. If a transient table is required, just use the
    ** automatically created table with root-page 1.
    */
    if( pOp->p2 ){
      int pgno;
      rc = sqlite3BtreeCreateTable(pCx->pBt, &pgno, BTREE_ZERODATA); 
      if( rc==SQLITE_OK ){
        assert( pgno==MASTER_ROOT+1 );
        rc = sqlite3BtreeCursor(pCx->pBt, pgno, 1, 0, 0, &pCx->pCursor);
      }
    }else{
      rc = sqlite3BtreeCursor(pCx->pBt, MASTER_ROOT, 1, 0, 0, &pCx->pCursor);

    }
  }
  break;
}

/* Opcode: OpenPseudo P1 * *
**
................................................................................
      Stringify(pNos);
      nKey = pNos->n;
      zKey = pNos->z;
    }else{
      assert( pNos->flags & MEM_Int );

      /* If the table is an INTKEY table, set nKey to the value of
      ** the integer key, and zKey to NULL.


      */

      if( pC->intKey ){
        nKey = intToKey(pNos->i);
        assert( keyToInt(nKey)==pNos->i );
        zKey = 0;
      }else{
        /* TODO: can this happen? zKey is not correctly byte-ordered here! */
        assert(!"TODO");
        nKey = sizeof(i64);
        zKey = (char*)&iKey;
      }
      iKey = pNos->i;

      if( pOp->p2 & OPFLAG_NCHANGE ) db->nChange++;
      if( pOp->p2 & OPFLAG_LASTROWID ) db->lastRowid = pNos->i;
      if( pOp->p2 & OPFLAG_CSCHANGE ) db->csChange++;
      if( pC->nextRowidValid && pTos->i>=pC->nextRowid ){
        pC->nextRowidValid = 0;
      }
................................................................................
  }else if( (pC = &p->aCsr[i])->pCursor!=0 ){
    sqlite3VdbeCursorMoveto(pC);
    zRec = 0;
    pCrsr = pC->pCursor;
    if( pC->nullRow ){
      payloadSize = 0;
    }else if( pC->keyAsData ){


      /* TODO: sqlite3BtreeKeySize(pCrsr, &payloadSize); */

    }else{
      sqlite3BtreeDataSize(pCrsr, &payloadSize);
    }
  }else if( pC->pseudoTable ){
    payloadSize = pC->nData;
    zRec = pC->pData;
    assert( payloadSize==0 || zRec!=0 );

**
** Various scripts scan this source file in order to generate HTML
** documentation, headers files, or other derived files.  The formatting
** of the code in this file is, therefore, important.  See other comments
** in this file for details.  If in doubt, do not deviate from existing
** commenting and indentation practices when changing or adding code.
**
** $Id: vdbe.c,v 1.277 2004/05/11 04:54:49 danielk1977 Exp $
*/
#include "sqliteInt.h"
#include "os.h"
#include <ctype.h>
#include "vdbeInt.h"

/*
................................................................................
  if( rc==SQLITE_OK ){
    rc = sqlite3BtreeBeginTrans(pCx->pBt);
  }
  if( rc==SQLITE_OK ){
    /* If a transient index is required, create it by calling
    ** sqlite3BtreeCreateTable() with the BTREE_ZERODATA flag before
    ** opening it. If a transient table is required, just use the
    ** automatically created table with root-page 1 (an INTKEY table).
    */
    if( pOp->p2 ){
      int pgno;
      rc = sqlite3BtreeCreateTable(pCx->pBt, &pgno, BTREE_ZERODATA); 
      if( rc==SQLITE_OK ){
        assert( pgno==MASTER_ROOT+1 );
        rc = sqlite3BtreeCursor(pCx->pBt, pgno, 1, 0, 0, &pCx->pCursor);
      }
    }else{
      rc = sqlite3BtreeCursor(pCx->pBt, MASTER_ROOT, 1, 0, 0, &pCx->pCursor);
      pCx->intKey = 1;
    }
  }
  break;
}

/* Opcode: OpenPseudo P1 * *
**
................................................................................
      Stringify(pNos);
      nKey = pNos->n;
      zKey = pNos->z;
    }else{
      assert( pNos->flags & MEM_Int );

      /* If the table is an INTKEY table, set nKey to the value of
      ** the integer key, and zKey to NULL. Otherwise, set nKey to
      ** sizeof(i64) and point zKey at iKey. iKey contains the integer
      ** key in the on-disk byte order.
      */
      iKey = intToKey(pNos->i);
      if( pC->intKey ){
        nKey = intToKey(pNos->i);

        zKey = 0;
      }else{


        nKey = sizeof(i64);
        zKey = (char*)&iKey;
      }


      if( pOp->p2 & OPFLAG_NCHANGE ) db->nChange++;
      if( pOp->p2 & OPFLAG_LASTROWID ) db->lastRowid = pNos->i;
      if( pOp->p2 & OPFLAG_CSCHANGE ) db->csChange++;
      if( pC->nextRowidValid && pTos->i>=pC->nextRowid ){
        pC->nextRowidValid = 0;
      }
................................................................................
  }else if( (pC = &p->aCsr[i])->pCursor!=0 ){
    sqlite3VdbeCursorMoveto(pC);
    zRec = 0;
    pCrsr = pC->pCursor;
    if( pC->nullRow ){
      payloadSize = 0;
    }else if( pC->keyAsData ){
      assert( !pC->intKey );
      u64 pl64;
      sqlite3BtreeKeySize(pCrsr, &pl64);
      payloadSize = pl64;
    }else{
      sqlite3BtreeDataSize(pCrsr, &payloadSize);
    }
  }else if( pC->pseudoTable ){
    payloadSize = pC->nData;
    zRec = pC->pData;
    assert( payloadSize==0 || zRec!=0 );