Example #1
0
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);
	milliSleep(50);
	continue;
      }
      std::cout << myTrans->getNdbError().code << std::endl;
      myNdb->closeTransaction(myTrans);
      return -1;
    }

    /**
     * start of loop: nextResult(true) means that "parallelism" number of
     * rows are fetched from NDB and cached in NDBAPI
     */    
    while((check = myScanOp->nextResult(true)) == 0){
      do {
	/**
	 * Get update operation
	 */    
	NdbOperation * myUpdateOp = myScanOp->updateCurrentTuple();
	if (myUpdateOp == 0)
	{
	  std::cout << myTrans->getNdbError().message << std::endl;
	  myNdb->closeTransaction(myTrans);
	  return -1;
	}
	updatedRows++;

	/**
	 * do the update
	 */    
	myUpdateOp->setValue(update_column, after_color);
	/**
	 * nextResult(false) means that the records 
	 * cached in the NDBAPI are modified before
	 * fetching more rows from NDB.
	 */    
      } while((check = myScanOp->nextResult(false)) == 0);
      
      /**
       * NoCommit when all cached tuple have been updated
       */    
      if(check != -1)
      {
	check = myTrans->execute(NdbTransaction::NoCommit);   
      }

      /**
       * Check for errors
       */
      err = myTrans->getNdbError();    
      if(check == -1)
      {
	if(err.status == NdbError::TemporaryError){
	  std::cout << myTrans->getNdbError().message << std::endl;
	  myNdb->closeTransaction(myTrans);
	  milliSleep(50);
	  continue;
	}	
      }
      /**
       * End of loop 
       */
    }

    /**
     * Commit all prepared operations
     */
    if(myTrans->execute(NdbTransaction::Commit) == -1)
    {
      if(err.status == NdbError::TemporaryError){
	std::cout << myTrans->getNdbError().message << std::endl;
	myNdb->closeTransaction(myTrans);
	milliSleep(50);
	continue;
      }	
    }

    std::cout << myTrans->getNdbError().message << std::endl;
    myNdb->closeTransaction(myTrans);
    return 0;    
  }


  if(myTrans!=0) 
  {
    std::cout << myTrans->getNdbError().message << std::endl;
    myNdb->closeTransaction(myTrans);
  }
  return -1;
}
int 
HugoTransactions::indexUpdateRecords(Ndb* pNdb, 
				     const char * idxName,
				     int records,
				     int batch){

  int updated = 0;
  int                  r = 0;
  int                  retryAttempt = 0;
  int                  check, a, b;
  NdbOperation *pOp;
  NdbScanOperation * sOp;

  const NdbDictionary::Index* pIndex
    = pNdb->getDictionary()->getIndex(idxName, tab.getName());
  
  const bool ordered = (pIndex->getType()==NdbDictionary::Index::OrderedIndex);
  if (ordered){
    batch = 1;
  }

  allocRows(batch);
  
  while (r < records){
    if (retryAttempt >= m_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){
	ERR(err);
	NdbSleep_MilliSleep(50);
	retryAttempt++;
	continue;
      }
      ERR(err);
      return NDBT_FAILED;
    }

    for(b = 0; b<batch && (b+r)<records; b++){
      if(!ordered){
	pOp = pTrans->getNdbIndexOperation(idxName, tab.getName());	
	if (pOp == NULL) {
	  ERR(pTrans->getNdbError());
	  closeTransaction(pNdb);
	  return NDBT_FAILED;
	}
	
	check = pOp->readTupleExclusive();
	if( check == -1 ) {
	  ERR(pTrans->getNdbError());
	  closeTransaction(pNdb);
	  return NDBT_FAILED;
	}
      } else {
	pOp = sOp = pTrans->getNdbIndexScanOperation(idxName, tab.getName());
	if (pOp == NULL) {
	  ERR(pTrans->getNdbError());
	  closeTransaction(pNdb);
	  return NDBT_FAILED;
	}
	
	check = 0;
	sOp->readTuplesExclusive();
      }	
      
      // Define primary keys
      if (equalForRow(pOp, r+b) != 0)
      {
        closeTransaction(pNdb);
        return NDBT_FAILED;
      }
      
      // Define attributes to read  
      for(a = 0; a<tab.getNoOfColumns(); a++){
	if((rows[b]->attributeStore(a) = 
	    pOp->getValue(tab.getColumn(a)->getName())) == 0) {
	  ERR(pTrans->getNdbError());
	  closeTransaction(pNdb);
	  return NDBT_FAILED;
	}
      }
    }
     
    check = pTrans->execute(NoCommit, AbortOnError);   
    check = (check == -1 ? -1 : !ordered ? check : sOp->nextResult(true));
    if( check == -1 ) {
      const NdbError err = pTrans->getNdbError();
      ERR(err);
      closeTransaction(pNdb);
      
      if (err.status == NdbError::TemporaryError){
	NdbSleep_MilliSleep(50);
	retryAttempt++;
	continue;
      }
      return NDBT_FAILED;
    }

    if(ordered && check != 0){
      g_err << check << " - Row: " << r << " not found!!" << endl;
      closeTransaction(pNdb);
      return NDBT_FAILED;    
    }
    
    for(b = 0; b<batch && (b+r)<records; b++){
      if (calc.verifyRowValues(rows[b]) != 0){
	closeTransaction(pNdb);
	return NDBT_FAILED;
      }
      
      int updates = calc.getUpdatesValue(rows[b]) + 1;
      
      NdbOperation* pUpdOp;
      if(!ordered){
	pUpdOp = pTrans->getNdbIndexOperation(idxName, tab.getName());
	check = (pUpdOp == 0 ? -1 : pUpdOp->updateTuple());
      } else {
	pUpdOp = sOp->updateCurrentTuple();
      }

      if (pUpdOp == NULL) {
	ERR(pTrans->getNdbError());
	closeTransaction(pNdb);
	return NDBT_FAILED;
      }
      
      if( check == -1 ) {
	ERR(pTrans->getNdbError());
	closeTransaction(pNdb);
	return NDBT_FAILED;
      }
      
      if(!ordered)
      {
        if (equalForRow(pUpdOp, r+b) != 0)
        {
          closeTransaction(pNdb);
          return NDBT_FAILED;
        }
      }
      
      for(a = 0; a<tab.getNoOfColumns(); a++){
	if (tab.getColumn(a)->getPrimaryKey() == false){
	  if(setValueForAttr(pUpdOp, a, r+b, updates ) != 0){
	    ERR(pTrans->getNdbError());
	    closeTransaction(pNdb);
	    return NDBT_FAILED;
	  }
	}
      }
    }
    
    check = pTrans->execute(Commit, AbortOnError);   
    if( check == -1 ) {
      const NdbError err = pTrans->getNdbError();
      ERR(err);
      closeTransaction(pNdb);
      
      if (err.status == NdbError::TemporaryError){
	NdbSleep_MilliSleep(50);
	retryAttempt++;
	continue;
      }
      ndbout << "r = " << r << endl;
      return NDBT_FAILED;
    } else {
      updated += batch;
      m_latest_gci = pTrans->getGCI();
    }
    
    closeTransaction(pNdb);
    
    r+= batch; // Read next record
  }
  
  g_info << "|- " << updated << " records updated" << endl;
  return NDBT_OK;
}