C++ NdbOperation::setValue方法代码示例

void
start_T1(Ndb * pNDB, ThreadData * td, int async){

  DEBUG2("T1(%.*s): - Starting", SUBSCRIBER_NUMBER_LENGTH, 
	 td->transactionData.number); 

  NdbConnection * pCON = 0;
  while((pCON = startTransaction(pNDB, td)) == 0){
    CHECK_ALLOWED_ERROR("T1: startTransaction", td, pNDB->getNdbError());
    NdbSleep_MilliSleep(10);
  }

  NdbOperation *MyOp = pCON->getNdbOperation(SUBSCRIBER_TABLE);
  if (MyOp != NULL) {  
    MyOp->updateTuple();  
    MyOp->equal(IND_SUBSCRIBER_NUMBER, 
		td->transactionData.number);
    MyOp->setValue(IND_SUBSCRIBER_LOCATION, 
		   (char *)&td->transactionData.location);
    MyOp->setValue(IND_SUBSCRIBER_CHANGED_BY, 
		   td->transactionData.changed_by);
    MyOp->setValue(IND_SUBSCRIBER_CHANGED_TIME, 
		   td->transactionData.changed_time);
    if (async == 1) {
      pCON->executeAsynchPrepare( Commit , T1_Callback, td);
    } else {
      int result = pCON->execute(Commit);
      T1_Callback(result, pCON, (void*)td);
      return;
    }//if
  } else {
    CHECK_NULL(MyOp, "T1: getNdbOperation", td, pCON->getNdbError());
  }//if
}

/**
 * Transaction 1 - T1 
 *
 * Update location and changed by/time on a subscriber
 *
 * Input: 
 *   SubscriberNumber,
 *   Location,
 *   ChangedBy,
 *   ChangedTime
 *
 * Output:
 */
void
start_T1(Ndb * pNDB, ThreadData * td){

  DEBUG2("T1(%.*s): - Starting\n", SUBSCRIBER_NUMBER_LENGTH, 
	 td->transactionData.number); 

  int check;
  NdbConnection * pCON = pNDB->startTransaction();
  if (pCON != NULL) {
    NdbOperation *MyOp = pCON->getNdbOperation(SUBSCRIBER_TABLE);
    if (MyOp != NULL) {  
      MyOp->updateTuple();  
      MyOp->equal(IND_SUBSCRIBER_NUMBER, 
		  td->transactionData.number);
      MyOp->setValue(IND_SUBSCRIBER_LOCATION, 
		     (char *)&td->transactionData.location);
      MyOp->setValue(IND_SUBSCRIBER_CHANGED_BY, 
		     td->transactionData.changed_by);
      MyOp->setValue(IND_SUBSCRIBER_CHANGED_TIME, 
		     td->transactionData.changed_time);
      pCON->executeAsynchPrepare( Commit , T1_Callback, td);
    } else {
      CHECK_NULL(MyOp, "T1: getNdbOperation", pCON);
    }//if
  } else {
    error_handler("T1-1: startTranscation", 
		  pNDB->getNdbErrorString(), 
		  pNDB->getNdbError());
  }//if
}

/**
 * Transaction 1 - T1 
 *
 * Update location and changed by/time on a subscriber
 *
 * Input: 
 *   SubscriberNumber,
 *   Location,
 *   ChangedBy,
 *   ChangedTime
 *
 * Output:
 */
int 
T1(void * obj,
   const SubscriberNumber number, 
   const Location new_location, 
   const ChangedBy changed_by, 
   const ChangedTime changed_time,
   BenchmarkTime * transaction_time){

  Ndb * pNDB = (Ndb *) obj;

  DEBUG2("T1(%.*s):\n", SUBSCRIBER_NUMBER_LENGTH, number);

  BenchmarkTime start;
  get_time(&start);

  int check;
  NdbRecAttr * check2;

  NdbConnection * MyTransaction = pNDB->startTransaction();
  if (MyTransaction == NULL)	  
    error_handler("T1-1: startTranscation", pNDB->getNdbErrorString(), 0);

  NdbOperation *MyOperation = MyTransaction->getNdbOperation(SUBSCRIBER_TABLE);
  CHECK_NULL(MyOperation, "T1: getNdbOperation", MyTransaction);
  
  check = MyOperation->updateTuple();
  CHECK_MINUS_ONE(check, "T1: updateTuple", 
		  MyTransaction);
  
  check = MyOperation->equal(IND_SUBSCRIBER_NUMBER, 
			     number);
  CHECK_MINUS_ONE(check, "T1: equal subscriber",
		  MyTransaction);

  check = MyOperation->setValue(IND_SUBSCRIBER_LOCATION, 
				(char *)&new_location);
  CHECK_MINUS_ONE(check, "T1: setValue location", 
		  MyTransaction);

  check = MyOperation->setValue(IND_SUBSCRIBER_CHANGED_BY, 
				changed_by);
  CHECK_MINUS_ONE(check, "T1: setValue changed_by", 
		  MyTransaction);

  check = MyOperation->setValue(IND_SUBSCRIBER_CHANGED_TIME, 
				changed_time);
  CHECK_MINUS_ONE(check, "T1: setValue changed_time", 
		  MyTransaction);

  check = MyTransaction->execute( Commit ); 
  CHECK_MINUS_ONE(check, "T1: Commit", 
		  MyTransaction);
  
  pNDB->closeTransaction(MyTransaction);
  
  get_time(transaction_time);
  time_diff(transaction_time, &start);
  return 0;
}

void write_rows (Ndb* pMyNdb) {

    /****************************************************************
     *    Insert rows into SimpleTable
     *
     ***************************************************************/

    int check = -1 ;
    int loop_count_ops = nRecords ;
    NdbOperation      *MyOperation = NULL ;
    NdbConnection     *MyTransaction = NULL ;

    ndbout << endl << "Writing records ..."  << flush;

    for (int count=0 ; count < loop_count_ops ; count++) {
        MyTransaction = pMyNdb->startTransaction();
        if (!MyTransaction) {
            error_handler(pMyNdb->getNdbError(), NO_FAIL);
        }//if

        MyOperation = MyTransaction->getNdbOperation(tableName);
        if (!MyOperation) {
            error_handler(pMyNdb->getNdbError(), NO_FAIL);
        }//if

        check = MyOperation->writeTuple();
        if( check == -1 ) error_handler(MyTransaction->getNdbError(), NO_FAIL);

        check = MyOperation->equal( attrName[0],(char*)&pkValue[count] );
        if( check == -1 ) error_handler(MyTransaction->getNdbError(), NO_FAIL);

        // Update the columns, index column already ok.
        for (int i = 1 ; i < MAXATTR; i++) {
            if ((i == 2) && (count > 4)) {
                check = MyOperation->setValue(attrName[i], (char*)&attrValue[count + 1]);
            } else {
                check = MyOperation->setValue(attrName[i], (char*)&attrValue[count]);
            }
            if( check == -1 ) error_handler(MyTransaction->getNdbError(), NO_FAIL);
        }
        check = MyTransaction->execute( Commit );
        if(check == -1 ) error_handler(MyTransaction->getNdbError(), NO_FAIL);

        pMyNdb->closeTransaction(MyTransaction);
    }
    ndbout <<" \tOK" << endl;
    return;
}

int UpdateTransaction(Ndb* pNdb, long iContextId, NdbError& err)
{
    int iRes = -1;
    NdbConnection* pNdbConnection = pNdb->startTransaction(0, (const char*)&iContextId, 4);
    if(pNdbConnection)
    {
        NdbOperation* pNdbOperation = pNdbConnection->getNdbOperation(g_szTableName);
        if(pNdbOperation)
        {
            if(!pNdbOperation->updateTuple()
            && !pNdbOperation->equal(c_szContextId, (Int32)iContextId)
            && !pNdbOperation->setValue(c_szContextData, STATUS_DATA, g_nStatusDataSize))
            {
                if(!pNdbConnection->execute(Commit))
                    iRes = 0;
                else 
                    err = pNdbConnection->getNdbError();
            }
            else 
                err = pNdbOperation->getNdbError();
        } 
        else 
            err = pNdbConnection->getNdbError();

        pNdb->closeTransaction(pNdbConnection);
    } 
    else 
        err = pNdb->getNdbError();

    return iRes;
}

int 
UtilTransactions::addRowToInsert(Ndb* pNdb,
				 NdbConnection* pInsTrans,
				 NDBT_ResultRow & row,
				 const char *insertTabName){

  int check;
  NdbOperation* pInsOp;

  pInsOp = pInsTrans->getNdbOperation(insertTabName);	
  if (pInsOp == NULL) {
    ERR(pInsTrans->getNdbError());
    return NDBT_FAILED;
  }
  
  check = pInsOp->insertTuple();
  if( check == -1 ) {
    ERR(pInsTrans->getNdbError());
    return NDBT_FAILED;
  }

  // Set all attributes
  for (int a = 0; a < tab.getNoOfColumns(); a++){
    NdbRecAttr* r =  row.attributeStore(a);
    int	 sz = r->get_size_in_bytes();
    if (pInsOp->setValue(tab.getColumn(a)->getName(),
			 r->aRef(),
			 sz) != 0) {
      ERR(pInsTrans->getNdbError());
      return NDBT_FAILED;
    }
  }
  
  return NDBT_OK;
}

int userDbInsertServer(UserHandle       *uh,
                       ServerId         serverId,
	               SubscriberSuffix suffix,
	               ServerName       name)
{
  int check;

  uint32 noOfRead   = 0;
  uint32 noOfInsert = 0;
  uint32 noOfDelete = 0;

  NdbConnection * MyTransaction = 0;
  if(uh->pCurrTrans != 0){
    MyTransaction = uh->pCurrTrans;
  } else {
    uh->pCurrTrans = MyTransaction = uh->pNDB->startTransaction();
  }
  if (MyTransaction == NULL)	  
    error_handler("startTranscation", uh->pNDB->getNdbError(), 0);
  
  NdbOperation *MyOperation = MyTransaction->getNdbOperation(SERVER_TABLE);
  CHECK_NULL(MyOperation, "getNdbOperation", MyTransaction);
  
  check = MyOperation->insertTuple();
  CHECK_MINUS_ONE(check, "insert tuple", MyTransaction);  
  
  check = MyOperation->equal(SERVER_ID, (char*)&serverId);
  CHECK_MINUS_ONE(check, "setValue id", MyTransaction);  
  
  check = MyOperation->setValue(SERVER_SUBSCRIBER_SUFFIX, suffix);
  CHECK_MINUS_ONE(check, "setValue suffix", MyTransaction);  

  check = MyOperation->setValue(SERVER_NAME, name);
  CHECK_MINUS_ONE(check, "setValue name", MyTransaction);  

  check = MyOperation->setValue(SERVER_READS, (char*)&noOfRead);
  CHECK_MINUS_ONE(check, "setValue reads", MyTransaction);  

  check = MyOperation->setValue(SERVER_INSERTS, (char*)&noOfInsert);
  CHECK_MINUS_ONE(check, "setValue inserts", MyTransaction);  

  check = MyOperation->setValue(SERVER_DELETES, (char*)&noOfDelete);
  CHECK_MINUS_ONE(check, "setValue deletes", MyTransaction);  

  return 0;
}

int
insert_server(void * obj,
	      ServerId serverId,
	      SubscriberSuffix suffix,
	      ServerName name,
	      Counter noOfRead,
	      Counter noOfInsert,
	      Counter noOfDelete){
  Ndb * pNDB = (Ndb *)obj;
  int check;

  NdbConnection * MyTransaction = pNDB->startTransaction();
  if (MyTransaction == NULL)	  
    error_handler("startTranscation", pNDB->getNdbErrorString(), 0);
  
  NdbOperation *MyOperation = MyTransaction->getNdbOperation(SERVER_TABLE);
  CHECK_NULL(MyOperation, "getNdbOperation", MyTransaction);
  
  check = MyOperation->insertTuple();
  CHECK_MINUS_ONE(check, "insert tuple", MyTransaction);  
  
  check = MyOperation->equal(SERVER_ID, (char*)&serverId);
  CHECK_MINUS_ONE(check, "setValue id", MyTransaction);  
  
  check = MyOperation->setValue(SERVER_SUBSCRIBER_SUFFIX, suffix);
  CHECK_MINUS_ONE(check, "setValue suffix", MyTransaction);  

  check = MyOperation->setValue(SERVER_NAME, name);
  CHECK_MINUS_ONE(check, "setValue name", MyTransaction);  

  check = MyOperation->setValue(SERVER_READS, (char*)&noOfRead);
  CHECK_MINUS_ONE(check, "setValue reads", MyTransaction);  

  check = MyOperation->setValue(SERVER_INSERTS, (char*)&noOfInsert);
  CHECK_MINUS_ONE(check, "setValue inserts", MyTransaction);  

  check = MyOperation->setValue(SERVER_DELETES, (char*)&noOfDelete);
  CHECK_MINUS_ONE(check, "setValue deletes", MyTransaction);  

  check = MyTransaction->execute( Commit ); 
  CHECK_MINUS_ONE(check, "commit", MyTransaction);  
  
  pNDB->closeTransaction(MyTransaction);
  return 0;
}

static void run_master_update(struct Xxx &xxx, struct XxxR &xxxr)
{
  Ndb *ndb = xxx.ndb;
  const NdbDictionary::Table *myTable = xxx.table;
  int retry_sleep= 10; /* 10 milliseconds */
  int retries= 100;
  while (1)
  {
    Uint32 val;
    NdbTransaction *trans = ndb->startTransaction();
    if (trans == NULL)
      goto err;
    {
      NdbOperation *op = trans->getNdbOperation(myTable);
      if (op == NULL)
        APIERROR(trans->getNdbError());
      op->readTupleExclusive();
      op->equal(xxx.pk_col, xxxr.pk_val);
      op->getValue(xxx.col, (char *)&val);
    }
    if (trans->execute(NdbTransaction::NoCommit))
      goto err;
    //fprintf(stderr, "read %u\n", val);
    xxxr.val = val + 1;
    {
      NdbOperation *op = trans->getNdbOperation(myTable);
      if (op == NULL)
        APIERROR(trans->getNdbError());
      op->updateTuple();
      op->equal(xxx.pk_col, xxxr.pk_val);
      op->setValue(xxx.col, xxxr.val);
    }
    if (trans->execute(NdbTransaction::Commit))
      goto err;
    ndb->closeTransaction(trans);
    //fprintf(stderr, "updated to %u\n", xxxr.val);
    break;
err:
    const NdbError this_error= trans ?
      trans->getNdbError() : ndb->getNdbError();
    if (this_error.status == NdbError::TemporaryError)
    {
      if (retries--)
      {
        if (trans)
          ndb->closeTransaction(trans);
        NdbSleep_MilliSleep(retry_sleep);
        continue; // retry
      }
    }
    if (trans)
      ndb->closeTransaction(trans);
    APIERROR(this_error);
  }
  /* update done start timer */
  gettimeofday(&xxxr.start_time, 0);
}

int InsertTransaction(Ndb* pNdb, 
                      long iContextID, 
                      long iVersion, 
                      long iLockFlag, 
                      long iLockTime, 
                      long iLockTimeUSec, 
                      const char* pchContextData, 
                      NdbError& err)
{
    int iRes = -1;
    NdbConnection* pNdbConnection = pNdb->startTransaction(0, (const char*)&iContextID, 4);
    if(pNdbConnection)
    {
        NdbOperation* pNdbOperation = pNdbConnection->getNdbOperation(g_szTableName);
        if(pNdbOperation) 
        {
            if(!(g_bWriteTuple ? pNdbOperation->writeTuple() : pNdbOperation->insertTuple())
                && !pNdbOperation->equal(c_szContextId, (Int32)iContextID)
                && !pNdbOperation->setValue(c_szVersion, (Int32)iVersion)
                && !pNdbOperation->setValue(c_szLockFlag, (Int32)iLockFlag)
                && !pNdbOperation->setValue(c_szLockTime, (Int32)iLockTime)
                && !pNdbOperation->setValue(c_szLockTimeUSec, (Int32)iLockTimeUSec)
                && !pNdbOperation->setValue(c_szContextData, pchContextData, g_nStatusDataSize))  
            {
                if(!pNdbConnection->execute(Commit))
                    iRes = 0;
                else 
                    err = pNdbConnection->getNdbError();
            }
            else 
                err = pNdbOperation->getNdbError();
        } 
        else 
            err = pNdbConnection->getNdbError();

        pNdb->closeTransaction(pNdbConnection);
    } 
    else 
        err = pNdb->getNdbError();

    return iRes;
}

int userDbInsertGroup(UserHandle *uh,
		      GroupId    groupId, 
		      GroupName  name,
		      Permission allowRead,
		      Permission allowInsert,
		      Permission allowDelete)
{
  int check;
  
  NdbConnection * MyTransaction = 0;
  if(uh->pCurrTrans != 0){
    MyTransaction = uh->pCurrTrans;
  } else {
    uh->pCurrTrans = MyTransaction = uh->pNDB->startTransaction();
  }
  if (MyTransaction == NULL)	  
    error_handler("startTranscation", uh->pNDB->getNdbError(), 0);

  NdbOperation *MyOperation = MyTransaction->getNdbOperation(GROUP_TABLE);
  CHECK_NULL(MyOperation, "getNdbOperation", MyTransaction);  
  
  check = MyOperation->insertTuple();
  CHECK_MINUS_ONE(check, "insertTuple", MyTransaction);  
  
  check = MyOperation->equal(GROUP_ID, (char*)&groupId);
  CHECK_MINUS_ONE(check, "equal", MyTransaction);  
  
  check = MyOperation->setValue(NDB_GROUP_NAME, name);
  CHECK_MINUS_ONE(check, "setValue name", MyTransaction);  

  check = MyOperation->setValue(GROUP_ALLOW_READ, (char*)&allowRead);
  CHECK_MINUS_ONE(check, "setValue allowRead", MyTransaction);  

  check = MyOperation->setValue(GROUP_ALLOW_INSERT, (char*)&allowInsert);
  CHECK_MINUS_ONE(check, "setValue allowInsert", MyTransaction);  

  check = MyOperation->setValue(GROUP_ALLOW_DELETE, (char*)&allowDelete);
  CHECK_MINUS_ONE(check, "setValue allowDelete", MyTransaction);  
  
  return 0;
}

/**
 * Transaction 1 - T1 
 *
 * Update location and changed by/time on a subscriber
 *
 * Input: 
 *   SubscriberNumber,
 *   Location,
 *   ChangedBy,
 *   ChangedTime
 *
 * Output:
 */
void
userTransaction_T1(UserHandle * uh,
		   SubscriberNumber number, 
		   Location new_location, 
		   ChangedBy changed_by, 
		   ChangedTime changed_time){
  Ndb * pNDB = uh->pNDB;

  DEBUG2("T1(%.*s):\n", SUBSCRIBER_NUMBER_LENGTH, number);

  int check;
  NdbRecAttr * check2;

  NdbConnection * MyTransaction = pNDB->startTransaction();
  if (MyTransaction != NULL) {
    NdbOperation *MyOperation = MyTransaction->getNdbOperation(SUBSCRIBER_TABLE);
    if (MyOperation != NULL) {  
      MyOperation->updateTuple();  
      MyOperation->equal(IND_SUBSCRIBER_NUMBER,
                         number);
      MyOperation->setValue(IND_SUBSCRIBER_LOCATION, 
		            (char *)&new_location);
      MyOperation->setValue(IND_SUBSCRIBER_CHANGED_BY, 
			    changed_by);
      MyOperation->setValue(IND_SUBSCRIBER_CHANGED_TIME, 
			    changed_time);
      check = MyTransaction->execute( Commit );
      if (check != -1) {
        pNDB->closeTransaction(MyTransaction);
        return;
      } else {
        CHECK_MINUS_ONE(check, "T1: Commit", 
		        MyTransaction);
      }//if
    } else {
      CHECK_NULL(MyOperation, "T1: getNdbOperation", MyTransaction);
    }//if
  } else {
    error_handler("T1-1: startTranscation", pNDB->getNdbErrorString(), pNDB->getNdbError());
  }//if
}

//
//  Example insert
//  @param myNdb          Ndb object representing NDB Cluster
//  @param myTransaction  NdbTransaction used for transaction
//  @param myTable        Table to insert into
//  @param error          NdbError object returned in case of errors
//  @return -1 in case of failures, 0 otherwise
//
int insert(int transactionId, NdbTransaction* myTransaction,
	   const NdbDictionary::Table *myTable) {
  NdbOperation	 *myOperation;          // For other operations

  myOperation = myTransaction->getNdbOperation(myTable);
  if (myOperation == NULL) return -1;
  
  if (myOperation->insertTuple() ||  
      myOperation->equal("ATTR1", transactionId) ||
      myOperation->setValue("ATTR2", transactionId)) {
    APIERROR(myOperation->getNdbError());
    exit(-1);
  }

  return myTransaction->execute(NdbTransaction::NoCommit);
}

int userDbInsertSubscriber(UserHandle      *uh,
	                   SubscriberNumber number,
                           uint32           groupId,
	                   SubscriberName   name)
{
  int check;
  uint32 activeSessions = 0;
  Location l = 0;
  ChangedBy changedBy;
  ChangedTime changedTime;
  BaseString::snprintf(changedBy, sizeof(changedBy), "ChangedBy");
  BaseString::snprintf(changedTime, sizeof(changedTime), "ChangedTime");

  NdbConnection * MyTransaction = 0;
  if(uh->pCurrTrans != 0){
    MyTransaction = uh->pCurrTrans;
  } else {
    uh->pCurrTrans = MyTransaction = uh->pNDB->startTransaction();
  }
  if (MyTransaction == NULL)	  
    error_handler("startTranscation", uh->pNDB->getNdbError(), 0);
  
  NdbOperation *MyOperation = MyTransaction->getNdbOperation(SUBSCRIBER_TABLE);
  CHECK_NULL(MyOperation, "getNdbOperation", MyTransaction);
  
  check = MyOperation->insertTuple();
  CHECK_MINUS_ONE(check, "insertTuple", MyTransaction);
  
  check = MyOperation->equal(SUBSCRIBER_NUMBER, number);
  CHECK_MINUS_ONE(check, "equal", MyTransaction);

  check = MyOperation->setValue(SUBSCRIBER_NAME, name);
  CHECK_MINUS_ONE(check, "setValue name", MyTransaction);

  check = MyOperation->setValue(SUBSCRIBER_GROUP, (char*)&groupId);
  CHECK_MINUS_ONE(check, "setValue group", MyTransaction);

  check = MyOperation->setValue(SUBSCRIBER_LOCATION, (char*)&l);
  CHECK_MINUS_ONE(check, "setValue location", MyTransaction);

  check = MyOperation->setValue(SUBSCRIBER_SESSIONS, (char*)&activeSessions);
  CHECK_MINUS_ONE(check, "setValue sessions", MyTransaction);

  check = MyOperation->setValue(SUBSCRIBER_CHANGED_BY, changedBy);
  CHECK_MINUS_ONE(check, "setValue changedBy", MyTransaction);

  check = MyOperation->setValue(SUBSCRIBER_CHANGED_TIME, changedTime);
  CHECK_MINUS_ONE(check, "setValue changedTime", MyTransaction);

  return 0;
}

/************************************************************************
 * populate()
 * 1. Prepare 'parallelism' number of insert transactions. 
 * 2. Send transactions to NDB and wait for callbacks to execute
 */
int populate(Ndb * myNdb, int data, async_callback_t * cbData)
{

  NdbOperation*   myNdbOperation;       // For operations
  const NdbDictionary::Dictionary* myDict= myNdb->getDictionary();
  const NdbDictionary::Table *myTable= myDict->getTable("api_async");
  if (myTable == NULL) 
    APIERROR(myDict->getNdbError());

  async_callback_t * cb;
  int retries = 0;
  int current = 0;
  for(int i=0; i<1024; i++)
  {
    if(transaction[i].used == 0)
    {
      current = i;
      if (cbData == 0) 
      {
       /**
        * We already have a callback
	* This is an absolutely new transaction
        */
	cb = new async_callback_t;
	cb->retries = 0;
      }
      else 
      { 
       /**
        * We already have a callback
        */
	cb =cbData;
	retries = cbData->retries;
      }
      /**
       * Set data used by the callback
       */
      cb->ndb = myNdb;  //handle to Ndb object so that we can close transaction
                        // in the callback (alt. make myNdb global).

      cb->data =  data; //this is the data we want to insert
      cb->transaction = current; //This is the number (id)  of this transaction
      transaction[current].used = 1 ; //Mark the transaction as used
      break;
    }
  }
  if(!current)
    return -1;

  while(retries < MAX_RETRIES) 
    {
      transaction[current].conn = myNdb->startTransaction();
      if (transaction[current].conn == NULL) {
	/**
	 * no transaction to close since conn == null
	 */
	milliSleep(10);
	retries++;
	continue;
      }
      myNdbOperation = transaction[current].conn->getNdbOperation(myTable);
      if (myNdbOperation == NULL) 
      {
	if (asynchErrorHandler(transaction[current].conn, myNdb)) 
	{
	  myNdb->closeTransaction(transaction[current].conn);
	  transaction[current].conn = 0;
	  milliSleep(10);
	  retries++;
	  continue;
	}
	asynchExitHandler(myNdb);
      } // if
      if(myNdbOperation->insertTuple() < 0  ||
	 myNdbOperation->equal("REG_NO", data) < 0 ||
	 myNdbOperation->setValue("BRAND", "Mercedes") <0 ||
	 myNdbOperation->setValue("COLOR", "Blue") < 0)
      {
	if (asynchErrorHandler(transaction[current].conn, myNdb)) 
	{
	  myNdb->closeTransaction(transaction[current].conn);
	  transaction[current].conn = 0;
	  retries++;
	  milliSleep(10);
	  continue;
	}
	asynchExitHandler(myNdb);
      }     

      /*Prepare transaction (the transaction is NOT yet sent to NDB)*/
      transaction[current].conn->executeAsynchPrepare(NdbTransaction::Commit, 
						       &callback,
						       cb);
      /**
       * When we have prepared parallelism number of transactions ->
//.........这里部分代码省略.........