C++ NdbScanOperation::deleteCurrentTuple方法代码示例

本文整理汇总了C++中NdbScanOperation::deleteCurrentTuple方法的典型用法代码示例。如果您正苦于以下问题：C++ NdbScanOperation::deleteCurrentTuple方法的具体用法？C++ NdbScanOperation::deleteCurrentTuple怎么用？C++ NdbScanOperation::deleteCurrentTuple使用的例子？那么, 这里精选的方法代码示例或许可以为您提供帮助。您也可以进一步了解该方法所在类NdbScanOperation的用法示例。

在下文中一共展示了NdbScanOperation::deleteCurrentTuple方法的3个代码示例，这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞，您的评价将有助于系统推荐出更棒的C++代码示例。

示例1: while

int 
UtilTransactions::clearTable(Ndb* pNdb, 
                             NdbScanOperation::ScanFlag flags,
                             int records,
                             int parallelism){
  // Scan all records exclusive and delete 
  // them one by one
  int                  retryAttempt = 0;
  const int            retryMax = 10;
  int deletedRows = 0;
  int check;
  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 = getScanOperation(pTrans);
    if (pOp == NULL) {
      err = pTrans->getNdbError();
      if(err.status == NdbError::TemporaryError){
	ERR(err);
	closeTransaction(pNdb);
	NdbSleep_MilliSleep(50);
	par = 1;
	goto restart;
      }
      goto failed;
    }
    
    if( pOp->readTuples(NdbOperation::LM_Exclusive, flags, par) ) {
      err = pTrans->getNdbError();
      goto failed;
    }
    
    if(pTrans->execute(NoCommit, AbortOnError) != 0){
      err = pTrans->getNdbError();    
      if(err.status == NdbError::TemporaryError){
	ERR(err);
	closeTransaction(pNdb);
	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){
	check = pTrans->execute(Commit, AbortOnError);   
	pTrans->restart();
      }
      
      err = pTrans->getNdbError();    
      if(check == -1){
	if(err.status == NdbError::TemporaryError){
	  ERR(err);
	  closeTransaction(pNdb);
	  NdbSleep_MilliSleep(50);
	  par = 1;
	  goto restart;
	}
	goto failed;
      }
    }
    if(check == -1){
      err = pTrans->getNdbError();    
      if(err.status == NdbError::TemporaryError){
	ERR(err);
	closeTransaction(pNdb);
	NdbSleep_MilliSleep(50);
	par = 1;
	goto restart;
      }
      goto failed;
    }
    closeTransaction(pNdb);
//.........这里部分代码省略.........

开发者ID:4T-Shirt，项目名称:mysql，代码行数:101，代码来源:UtilTransactions.cpp

示例2: scan_delete


//.........这里部分代码省略.........
    if(filter.begin(NdbScanFilter::AND) < 0  || 
       filter.cmp(NdbScanFilter::COND_EQ, column, 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 << err.code << std::endl;
      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 
      {
	if (myScanOp->deleteCurrentTuple() != 0)
	{
	  std::cout << myTrans->getNdbError().message << std::endl;
	  myNdb->closeTransaction(myTrans);
	  return -1;
	}
	deletedRows++;
	
	/**
	 * 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 marked for deletion
       */    
      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;
}

开发者ID:Baoxiyi-Github，项目名称:Mysql，代码行数:101，代码来源:ndbapi_scan.cpp

示例3: clear_table

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.........

开发者ID:A-eolus，项目名称:mysql，代码行数:101，代码来源:delete_all.cpp

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