C++ NdbTransaction::getNdbScanOperation方法代码示例

int runScanRefreshNoTimeout(NDBT_Context* ctx, NDBT_Step* step){
  int result = NDBT_OK;
  int loops = ctx->getNumLoops();
  int records = ctx->getNumRecords();
  int stepNo = step->getStepNo();
  int maxSleep = (int)(TIMEOUT * 0.3);
  ndbout << "TransactionInactiveTimeout="<< TIMEOUT
	 << ", maxSleep="<<maxSleep<<endl;

  HugoOperations hugoOps(*ctx->getTab());
  Ndb* pNdb = GETNDB(step);

  for (int l = 1; l < loops && result == NDBT_OK; l++){

    do{
      // Start an insert trans
      CHECK(hugoOps.startTransaction(pNdb) == 0);
      int recordNo = records + (stepNo*loops) + l;
      CHECK(hugoOps.pkInsertRecord(pNdb, recordNo) == 0);
      CHECK(hugoOps.execute_NoCommit(pNdb) == 0);
      
      for (int i = 0; i < 3; i++)
      {
        NdbTransaction* pTrans = hugoOps.getTransaction();

        Vector<NdbScanOperation*> ops;
        for (int j = 0; j <= i; j++)
        {
          // Perform buddy scan reads
          NdbScanOperation* pOp = pTrans->getNdbScanOperation(ctx->getTab());
          CHECK(pOp != 0);
          CHECK(pOp->readTuples(NdbOperation::LM_Read, 0, 0, 1) == 0);
          ops.push_back(pOp);
        }
        CHECK(pTrans->execute(NoCommit) == 0);

        for (unsigned i = 0; i<TIMEOUT; i += 1000)
        {
          pTrans->refresh();
          NdbSleep_MilliSleep(1000);
        }

        int res;
        for (unsigned j = 0; j < ops.size(); j++)
        {
          while((res = ops[j]->nextResult()) == 0);
          CHECK(res != -1);
        }
      }

      // Expect that transaction has NOT timed-out
      CHECK(hugoOps.execute_Commit(pNdb) == 0); 
    
    } while(false);

    hugoOps.closeTransaction(pNdb);
  }

  return result;
}

int runBuddyTransNoTimeout(NDBT_Context* ctx, NDBT_Step* step){
  int result = NDBT_OK;
  int loops = ctx->getNumLoops();
  int records = ctx->getNumRecords();
  int stepNo = step->getStepNo();
  int maxSleep = (int)(TIMEOUT * 0.3);
  ndbout << "TransactionInactiveTimeout="<< TIMEOUT
	 << ", maxSleep="<<maxSleep<<endl;

  HugoOperations hugoOps(*ctx->getTab());
  Ndb* pNdb = GETNDB(step);

  for (int l = 1; l < loops && result == NDBT_OK; l++){

    do{
      // Start an insert trans
      CHECK(hugoOps.startTransaction(pNdb) == 0);
      int recordNo = records + (stepNo*loops) + l;
      CHECK(hugoOps.pkInsertRecord(pNdb, recordNo) == 0);
      CHECK(hugoOps.execute_NoCommit(pNdb) == 0);
      
      int remain = maxSleep;
      for (int i = 0; i < 3; i++)
      {
        NdbTransaction* pTrans = hugoOps.getTransaction();

        // Perform buddy scan reads
        NdbScanOperation* pOp = pTrans->getNdbScanOperation(ctx->getTab());
        CHECK(pOp != 0);
        CHECK(pOp->readTuples(NdbOperation::LM_Read, 0, 0, 1) == 0);
        CHECK(pTrans->execute(NoCommit) == 0);
        while(pOp->nextResult() == 0);
	
        int sleep = myRandom48(remain);
        remain = remain - sleep + 1;
        ndbout << "Sleeping for " << sleep << " milliseconds" << endl;
        NdbSleep_MilliSleep(sleep);
      }

      // Expect that transaction has NOT timed-out
      CHECK(hugoOps.execute_Commit(pNdb) == 0); 
    
    } while(false);

    hugoOps.closeTransaction(pNdb);
  }

  return result;
}

int runBuddyTransTimeout(NDBT_Context* ctx, NDBT_Step* step){
  int result = NDBT_OK;
  int loops = ctx->getNumLoops();
  int records = ctx->getNumRecords();
  int stepNo = step->getStepNo();
  ndbout << "TransactionInactiveTimeout="<< TIMEOUT <<endl;

  HugoOperations hugoOps(*ctx->getTab());
  Ndb* pNdb = GETNDB(step);

  for (int l = 1; l < loops && result == NDBT_OK; l++){

    NdbTransaction* pTrans = 0;
    do{
      pTrans = pNdb->startTransaction();
      NdbScanOperation* pOp = pTrans->getNdbScanOperation(ctx->getTab());
      CHECK(pOp->readTuples(NdbOperation::LM_Read, 0, 0, 1) == 0);
      CHECK(pTrans->execute(NoCommit) == 0);
      
      int sleep = 2 * TIMEOUT;
      ndbout << "Sleeping for " << sleep << " milliseconds" << endl;
      NdbSleep_MilliSleep(sleep);
    
      int res = 0;
      while((res = pOp->nextResult()) == 0);
      ndbout_c("res: %d", res);
      CHECK(res == -1);
      
    } while(false);
    
    if (pTrans)
    {
      pTrans->close();
    }
  }
  
  return result;
}

int scan_print(Ndb * myNdb)
{
// Scan all records exclusive and update
  // them one by one
  int                  retryAttempt = 0;
  const int            retryMax = 10;
  int fetchedRows = 0;
  int check;
  NdbError              err;
  NdbTransaction	*myTrans;
  NdbScanOperation	*myScanOp;
  /* Result of reading attribute value, three columns:
     REG_NO, BRAND, and COLOR
   */
  NdbRecAttr *    	myRecAttr[3];   

  const NdbDictionary::Dictionary* myDict= myNdb->getDictionary();
  const NdbDictionary::Table *myTable= myDict->getTable("api_scan");

  if (myTable == NULL) 
    APIERROR(myDict->getNdbError());

  /**
   * Loop as long as :
   *  retryMax not reached
   *  failed operations due to TEMPORARY erros
   *
   * Exit loop;
   *  retyrMax reached
   *  Permanent error (return -1)
   */
  while (true)
  {

    if (retryAttempt >= retryMax)
    {
      std::cout << "ERROR: has retried this operation " << retryAttempt 
		<< " times, failing!" << std::endl;
      return -1;
    }

    myTrans = myNdb->startTransaction();
    if (myTrans == NULL) 
    {
      const NdbError err = myNdb->getNdbError();

      if (err.status == NdbError::TemporaryError)
      {
	milliSleep(50);
	retryAttempt++;
	continue;
      }
     std::cout << err.message << std::endl;
      return -1;
    }
    /*
     * Define a scan operation. 
     * NDBAPI.
     */
    myScanOp = myTrans->getNdbScanOperation(myTable);	
    if (myScanOp == NULL) 
    {
      std::cout << myTrans->getNdbError().message << std::endl;
      myNdb->closeTransaction(myTrans);
      return -1;
    }

    /**
     * Read without locks, without being placed in lock queue
     */
    if( myScanOp->readTuples(NdbOperation::LM_CommittedRead) == -1)
    {
      std::cout << myTrans->getNdbError().message << std::endl;
      myNdb->closeTransaction(myTrans);
      return -1;
    } 

    /**
     * Define storage for fetched attributes.
     * E.g., the resulting attributes of executing
     * myOp->getValue("REG_NO") is placed in myRecAttr[0].
     * No data exists in myRecAttr until transaction has commited!
     */
    myRecAttr[0] = myScanOp->getValue("REG_NO");
    myRecAttr[1] = myScanOp->getValue("BRAND");
    myRecAttr[2] = myScanOp->getValue("COLOR");
    if(myRecAttr[0] ==NULL || myRecAttr[1] == NULL || myRecAttr[2]==NULL) 
    {
	std::cout << myTrans->getNdbError().message << std::endl;
	myNdb->closeTransaction(myTrans);
	return -1;
    }
    /**
     * Start scan   (NoCommit since we are only reading at this stage);
     */     
    if(myTrans->execute(NdbTransaction::NoCommit) != 0){      
      err = myTrans->getNdbError();    
      if(err.status == NdbError::TemporaryError){
	std::cout << myTrans->getNdbError().message << std::endl;
	myNdb->closeTransaction(myTrans);
//.........这里部分代码省略.........

int scan_update(Ndb* myNdb, 
		int update_column,
		const char * before_color,
		const char * after_color)
		
{
  
  // Scan all records exclusive and update
  // them one by one
  int                  retryAttempt = 0;
  const int            retryMax = 10;
  int updatedRows = 0;
  int check;
  NdbError              err;
  NdbTransaction	*myTrans;
  NdbScanOperation	*myScanOp;

  const NdbDictionary::Dictionary* myDict= myNdb->getDictionary();
  const NdbDictionary::Table *myTable= myDict->getTable("api_scan");

  if (myTable == NULL) 
    APIERROR(myDict->getNdbError());

  /**
   * Loop as long as :
   *  retryMax not reached
   *  failed operations due to TEMPORARY erros
   *
   * Exit loop;
   *  retryMax reached
   *  Permanent error (return -1)
   */
  while (true)
  {

    if (retryAttempt >= retryMax)
    {
      std::cout << "ERROR: has retried this operation " << retryAttempt 
		<< " times, failing!" << std::endl;
      return -1;
    }

    myTrans = myNdb->startTransaction();
    if (myTrans == NULL) 
    {
      const NdbError err = myNdb->getNdbError();

      if (err.status == NdbError::TemporaryError)
      {
	milliSleep(50);
	retryAttempt++;
	continue;
      }
      std::cout <<  err.message << std::endl;
      return -1;
    }

   /**
    * Get a scan operation.
    */
    myScanOp = myTrans->getNdbScanOperation(myTable);	
    if (myScanOp == NULL) 
    {
      std::cout << myTrans->getNdbError().message << std::endl;
      myNdb->closeTransaction(myTrans);
      return -1;
    }

    /**
     * Define a result set for the scan.
     */ 
    if( myScanOp->readTuples(NdbOperation::LM_Exclusive) ) 
    {
      std::cout << myTrans->getNdbError().message << std::endl;
      myNdb->closeTransaction(myTrans);
      return -1;
    } 

    /**
     * Use NdbScanFilter to define a search critera
     */ 
    NdbScanFilter filter(myScanOp) ;   
    if(filter.begin(NdbScanFilter::AND) < 0  || 
       filter.cmp(NdbScanFilter::COND_EQ, update_column, before_color, 20) <0||
       filter.end() <0)
    {
      std::cout <<  myTrans->getNdbError().message << std::endl;
      myNdb->closeTransaction(myTrans);
      return -1;
    }    
    
    /**
     * Start scan    (NoCommit since we are only reading at this stage);
     */     
    if(myTrans->execute(NdbTransaction::NoCommit) != 0)
    {      
      err = myTrans->getNdbError();    
      if(err.status == NdbError::TemporaryError){
	std::cout << myTrans->getNdbError().message << std::endl;
	myNdb->closeTransaction(myTrans);
//.........这里部分代码省略.........

int
select_count(Ndb* pNdb, const NdbDictionary::Table* pTab,
             int parallelism,
             Uint64* count_rows,
             NdbOperation::LockMode lock) {

    int                  retryAttempt = 0;
    const int            retryMax = 100;
    int                  check;
    NdbTransaction       *pTrans;
    NdbScanOperation	       *pOp;
    const Uint32 codeWords= 1;
    Uint32 codeSpace[ codeWords ];
    NdbInterpretedCode code(NULL, // Table is irrelevant
                            &codeSpace[0],
                            codeWords);
    if ((code.interpret_exit_last_row() != 0) ||
            (code.finalise() != 0))
    {
        ERR(code.getNdbError());
        return NDBT_FAILED;
    }

    while (true) {

        if (retryAttempt >= retryMax) {
            g_info << "ERROR: has retried this operation " << retryAttempt
                   << " times, failing!" << endl;
            return NDBT_FAILED;
        }

        pTrans = pNdb->startTransaction();
        if (pTrans == NULL) {
            const NdbError err = pNdb->getNdbError();

            if (err.status == NdbError::TemporaryError) {
                NdbSleep_MilliSleep(50);
                retryAttempt++;
                continue;
            }
            ERR(err);
            return NDBT_FAILED;
        }
        pOp = pTrans->getNdbScanOperation(pTab->getName());
        if (pOp == NULL) {
            ERR(pTrans->getNdbError());
            pNdb->closeTransaction(pTrans);
            return NDBT_FAILED;
        }

        if( pOp->readTuples(NdbScanOperation::LM_Dirty) ) {
            ERR(pTrans->getNdbError());
            pNdb->closeTransaction(pTrans);
            return NDBT_FAILED;
        }


        check = pOp->setInterpretedCode(&code);
        if( check == -1 ) {
            ERR(pTrans->getNdbError());
            pNdb->closeTransaction(pTrans);
            return NDBT_FAILED;
        }

        Uint64 tmp;
        Uint32 row_size;
        pOp->getValue(NdbDictionary::Column::ROW_COUNT, (char*)&tmp);
        pOp->getValue(NdbDictionary::Column::ROW_SIZE, (char*)&row_size);
        check = pTrans->execute(NdbTransaction::NoCommit);
        if( check == -1 ) {
            ERR(pTrans->getNdbError());
            pNdb->closeTransaction(pTrans);
            return NDBT_FAILED;
        }

        Uint64 row_count = 0;
        int eof;
        while((eof = pOp->nextResult(true)) == 0) {
            row_count += tmp;
        }

        if (eof == -1) {
            const NdbError err = pTrans->getNdbError();

            if (err.status == NdbError::TemporaryError) {
                pNdb->closeTransaction(pTrans);
                NdbSleep_MilliSleep(50);
                retryAttempt++;
                continue;
            }
            ERR(err);
            pNdb->closeTransaction(pTrans);
            return NDBT_FAILED;
        }

        pNdb->closeTransaction(pTrans);

        if (count_rows != NULL) {
            *count_rows = row_count;
        }
//.........这里部分代码省略.........

int clear_table(Ndb* pNdb, const NdbDictionary::Table* pTab,
                bool fetch_across_commit, int parallelism)
{
  // Scan all records exclusive and delete 
  // them one by one
  int                  retryAttempt = 0;
  const int            retryMax = 10;
  int deletedRows = 0;
  int check;
  NdbTransaction *pTrans;
  NdbScanOperation *pOp;
  NdbError err;

  int par = parallelism;
  while (true){
  restart:
    if (retryAttempt++ >= retryMax){
      g_info << "ERROR: has retried this operation " << retryAttempt 
	     << " times, failing!" << endl;
      return NDBT_FAILED;
    }
    
    pTrans = pNdb->startTransaction();
    if (pTrans == NULL) {
      err = pNdb->getNdbError();
      if (err.status == NdbError::TemporaryError){
	ERR(err);
	NdbSleep_MilliSleep(50);
	continue;
      }
      goto failed;
    }

    pOp = pTrans->getNdbScanOperation(pTab->getName());	
    if (pOp == NULL) {
      goto failed;
    }
    
    int flags = 0;
    flags |= _tupscan ? NdbScanOperation::SF_TupScan : 0;
    flags |= _diskscan ? NdbScanOperation::SF_DiskScan : 0;
    if( pOp->readTuples(NdbOperation::LM_Exclusive, 
			flags, par) ) {
      goto failed;
    }
    
    if(pTrans->execute(NdbTransaction::NoCommit) != 0){
      err = pTrans->getNdbError();    
      if(err.status == NdbError::TemporaryError){
	ERR(err);
	pNdb->closeTransaction(pTrans);
	NdbSleep_MilliSleep(50);
	continue;
      }
      goto failed;
    }
    
    while((check = pOp->nextResult(true)) == 0){
      do {
	if (pOp->deleteCurrentTuple() != 0){
	  goto failed;
	}
	deletedRows++;
      } while((check = pOp->nextResult(false)) == 0);
      
      if(check != -1){
        if (fetch_across_commit) {
          check = pTrans->execute(NdbTransaction::Commit);   
          pTrans->restart(); // new tx id
        } else {
          check = pTrans->execute(NdbTransaction::NoCommit);
        }
      }
      
      err = pTrans->getNdbError();    
      if(check == -1){
	if(err.status == NdbError::TemporaryError){
	  ERR(err);
	  pNdb->closeTransaction(pTrans);
	  NdbSleep_MilliSleep(50);
	  par = 1;
	  goto restart;
	}
	goto failed;
      }
    }
    if(check == -1){
      err = pTrans->getNdbError();    
      if(err.status == NdbError::TemporaryError){
	ERR(err);
	pNdb->closeTransaction(pTrans);
	NdbSleep_MilliSleep(50);
	par = 1;
	goto restart;
      }
      goto failed;
    }
    if (! fetch_across_commit &&
        pTrans->execute(NdbTransaction::Commit) != 0) {
      err = pTrans->getNdbError();
//.........这里部分代码省略.........

int calc_var_column(const NdbDictionary::Table * t,
		    const NdbDictionary::Index * ix,
		    int col,
		    Ndb* ndb,
		    bool longvarchar,
		    bool ftScan,
            bool ignoreData)
{
  
  char buff[8052];
  memset(buff, 0, sizeof(buff));
  int sz=0;
  NdbTransaction * trans = ndb->startTransaction();
  if(trans==0)
    abort();

  NdbScanOperation * sop;
  sop=trans->getNdbScanOperation(t);

  sop->readTuples();
  NdbRecAttr * attr=sop->getValue(col, buff);
  int rows=0;
  int charset_size=1;
  bool no_data=false;  

  //Set charset cost (for binary and latin1 cost is 1)
  const NdbDictionary::Column  * c = t->getColumn(col);
  const NdbDictionary::Column::Type type = c->getType();
  if ((type == NdbDictionary::Column::Varchar) || (type == NdbDictionary::Column::Longvarchar))
  {
    CHARSET_INFO * cs2;
    cs2= (CHARSET_INFO*)(c->getCharset());

    if(cs2!=0)
    {       
      if(strncmp(cs2->name, "utf8",4)==0)
      {
        charset_size=3;
        printf(  "---\tWARNING! cs2->name charset used, each character cost : %d bytes\n",charset_size);
      }

      if(strncmp(cs2->name, "ucs2",4)==0)
      {
        charset_size=2;
        printf(  "---\tWARNING! cs2->name charset used, each character cost : %d bytes\n",charset_size);
      }
    }
  }

  //Set var header size
  int headerSize=longvarchar ? 2 : 1;



  if(trans->execute(NdbTransaction::NoCommit, 
		    NdbOperation::AbortOnError, 1) == -1)
  {
	no_data=true;
	trans->close();
  }


  if(!no_data)
  {
    int check=0;
    while( ((check = sop->nextResult(true)) == 0) && !ignoreData)
	{  
	  rows++;
      if (verbose) 
      {
        printf("attribut %d size = %d \n",rows,attr->isNULL()==1 ? 0 : attr->get_size_in_bytes());  
      }


      if(attr->isNULL()==1)  
      {
        sz+=0; //for the time being until we know for sure..
      }
      else
      { //attr->get_size_in_bytes return lengh of attr including header attr cost = (length-header*charset)
        sz+=((attr->get_size_in_bytes() - headerSize)* charset_size);
      }
            
	  if(rows==1024 && !ftScan)
	    break;
	}
    trans->close();
  }

  if(rows==0)
  {
    sz = (int)(((float)(t->getColumn(col)->getSizeInBytes()))* (float)((float)loadfactor/100));
    printf("---\tWARNING! No reference data found for VAR*. Defaulting to max size (loadfactor=100 percent)..%d bytes \n",sz);
    printf("\tConsider loading database with average data for exact measurement\n");
      
    return sz+waste_sz(sz);
  }

  int tmpsz=(sz/rows)+headerSize;
  sz=tmpsz + waste_sz(tmpsz);
//.........这里部分代码省略.........

int calc_blob_column(const NdbDictionary::Table * t,
		   const NdbDictionary::Index * ix,
		   int col,
		   Ndb* ndb,
		   int & szRam,
		   int & szDisk,
		   bool ftScan)
{

  NdbTransaction * trans = ndb->startTransaction();
  NdbScanOperation * sop = trans->getNdbScanOperation(t);

  sop->readTuples();

  NdbBlob * blob = sop->getBlobHandle(col);  
  bool no_data=false;
  if(trans->execute(NdbTransaction::NoCommit, 
		    NdbOperation::AbortOnError, 1) == -1)
    {
      no_data=true;
      sop->close();
      trans->close();
    }
  
  unsigned long long len=0;


  int rows=0;
  int check=0;
  const NdbDictionary::Column *  c = t->getColumn(col);
  int part_size= c->getPartSize();
  if(!no_data)
    {
      while(((check = sop->nextResult(true)) == 0) && !ignoreData)
	{
	  int isnull;
	  rows++;
	  blob->getNull(isnull);
	  if(isnull)
	    len=0;
	  else	    
	    blob->getLength(len);
	  
	  /*	  
		  printf("blob is %llu\n", len);
		  if(len>256)
		  {
		  szRam+=(((len-256)/part_size) + 1)*part_size+256;
		  printf("len2=%llu, part-size=%d, len=%llu\n", (((len-256)/part_size) + 1)*part_size+256, part_size, len);
		  
		  }
		  else
	  */
	  
	  szRam+=(int)len;
	  if(rows==1000 && !ftScan)
	    break;
	}
      sop->close();
      trans->close();
    }
  if(rows==0)
    {
      if (c->getStorageType() == NdbDictionary::Column::StorageTypeDisk)
      {
          printf("---\tWARNING! No reference data found for BLOB/TEXT. "
             "Defaulting to 256 bytes DataMemory, %d bytes Diskspace! \n",(part_size<=256 ? 0:part_size));
          printf("\tConsider loading database with average data for exact"
             " measurement. \n");
          szRam=256;
          szDisk=(part_size<=256 ? 0:part_size);
          return 0;
      }
      else
      {
         printf("---\tWARNING! No reference data found for BLOB/TEXT. "
	        "Defaulting to %d bytes DataMemory ! \n", (part_size<=256 ? 256:part_size+256));
         printf("\tConsider loading database with average data for exact"
	        " measurement. \n");
         szRam=(part_size<=256 ? 256:part_size+256);
         szDisk=0;
         return 0;
      }
    }
  if (c->getStorageType() == NdbDictionary::Column::StorageTypeDisk)
    {
    int averageSz=szRam/rows;
    if((averageSz)>256)
	  {
      szRam=256;
	  szDisk=((averageSz-256)/part_size) *part_size + (((averageSz-256)%part_size)==0 ? 0:part_size);
	  }
      else
	  {
      szRam=256;
	  szDisk=0;
	  }
    }
  else
    {
//.........这里部分代码省略.........

int scanReadRecords(Ndb* pNdb,
                    const NdbDictionary::Table* pTab,
                    const NdbDictionary::Index* pIdx,
                    int parallel,
                    int _lock,
                    bool headers,
                    bool useHexFormat,
                    char delimiter, bool order, bool descending) {

    int                  retryAttempt = 0;
    const int            retryMax = 100;
    int                  check;
    NdbTransaction       *pTrans;
    NdbScanOperation	       *pOp;
    NdbIndexScanOperation * pIOp= 0;

    NDBT_ResultRow * row = new NDBT_ResultRow(*pTab, delimiter);

    while (true) {

        if (retryAttempt >= retryMax) {
            ndbout << "ERROR: has retried this operation " << retryAttempt
                   << " times, failing!" << endl;
            return -1;
        }

        pTrans = pNdb->startTransaction();
        if (pTrans == NULL) {
            const NdbError err = pNdb->getNdbError();

            if (err.status == NdbError::TemporaryError) {
                NdbSleep_MilliSleep(50);
                retryAttempt++;
                continue;
            }
            ERR(err);
            return -1;
        }


        pOp = (!pIdx) ? pTrans->getNdbScanOperation(pTab->getName()) :
              pIOp=pTrans->getNdbIndexScanOperation(pIdx->getName(), pTab->getName());

        if (pOp == NULL) {
            ERR(pTrans->getNdbError());
            pNdb->closeTransaction(pTrans);
            return -1;
        }

        int rs;
        unsigned scan_flags = 0;
        if (_tup) scan_flags |= NdbScanOperation::SF_TupScan;
        switch(_lock + (3 * order)) {
        case 1:
            rs = pOp->readTuples(NdbScanOperation::LM_Read, scan_flags, parallel);
            break;
        case 2:
            rs = pOp->readTuples(NdbScanOperation::LM_Exclusive, scan_flags, parallel);
            break;
        case 3:
            rs = pIOp->readTuples(NdbScanOperation::LM_CommittedRead, 0, parallel,
                                  true, descending);
            break;
        case 4:
            rs = pIOp->readTuples(NdbScanOperation::LM_Read, 0, parallel, true, descending);
            break;
        case 5:
            rs = pIOp->readTuples(NdbScanOperation::LM_Exclusive, 0, parallel, true, descending);
            break;
        case 0:
        default:
            rs = pOp->readTuples(NdbScanOperation::LM_CommittedRead, scan_flags, parallel);
            break;
        }
        if( rs != 0 ) {
            ERR(pTrans->getNdbError());
            pNdb->closeTransaction(pTrans);
            return -1;
        }

        if(0) {
            NdbScanFilter sf(pOp);
#if 0
            sf.begin(NdbScanFilter::AND);
            sf.le(0, (Uint32)10);

            sf.end();
#elif 0
            sf.begin(NdbScanFilter::OR);
            sf.begin(NdbScanFilter::AND);
            sf.ge(0, (Uint32)10);
            sf.lt(0, (Uint32)20);
            sf.end();
            sf.begin(NdbScanFilter::AND);
            sf.ge(0, (Uint32)30);
            sf.lt(0, (Uint32)40);
            sf.end();
            sf.end();
#elif 1
            sf.begin(NdbScanFilter::AND);
//.........这里部分代码省略.........