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/* Copyright (C) 2003 MySQL AB
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */
/*****************************************************************************
* Name: NdbScanOperation.hpp
* Include:
* Link:
* Author: Martin Sköld
* Date: 2002-04-01
* Version: 0.1
* Description: Table scan support
* Documentation:
* Adjust: 2002-04-01 Martin Sköld First version.
****************************************************************************/
#ifndef NdbScanOperation_H
#define NdbScanOperation_H
#include <NdbOperation.hpp>
class NdbBlob;
class NdbResultSet;
/**
* @class NdbScanOperation
* @brief Class of scan operations for use in transactions.
*/
class NdbScanOperation : public NdbOperation {
friend class Ndb;
friend class NdbConnection;
friend class NdbResultSet;
friend class NdbOperation;
friend class NdbBlob;
public:
/**
* Type of cursor
*/
enum CursorType {
NoCursor = 0,
ScanCursor = 1,
IndexCursor = 2
};
/**
* Type of cursor
*/
CursorType get_cursor_type() const;
/**
* readTuples returns a NdbResultSet where tuples are stored.
* Tuples are not stored in NdbResultSet until execute(NoCommit)
* has been executed and nextResult has been called.
*
* @param parallel Scan parallelism
* @param batch No of rows to fetch from each fragment at a time
* @param LockMode Scan lock handling
* @returns NdbResultSet.
* @note specifying 0 for batch and parallall means max performance
*/
NdbResultSet* readTuples(LockMode = LM_Read,
Uint32 batch = 0, Uint32 parallel = 0);
inline NdbResultSet* readTuples(int parallell){
return readTuples(LM_Read, 0, parallell);
}
inline NdbResultSet* readTuplesExclusive(int parallell = 0){
return readTuples(LM_Exclusive, 0, parallell);
}
NdbBlob* getBlobHandle(const char* anAttrName);
NdbBlob* getBlobHandle(Uint32 anAttrId);
protected:
CursorType m_cursor_type;
NdbScanOperation(Ndb* aNdb);
virtual ~NdbScanOperation();
int nextResult(bool fetchAllowed = true);
virtual void release();
void closeScan();
int close_impl(class TransporterFacade*);
// Overloaded methods from NdbCursorOperation
int executeCursor(int ProcessorId);
// Overloaded private methods from NdbOperation
int init(const NdbTableImpl* tab, NdbConnection* myConnection);
int prepareSend(Uint32 TC_ConnectPtr, Uint64 TransactionId);
int doSend(int ProcessorId);
virtual void setErrorCode(int aErrorCode);
virtual void setErrorCodeAbort(int aErrorCode);
NdbResultSet * m_resultSet;
NdbResultSet* getResultSet();
NdbConnection *m_transConnection;
// Scan related variables
Uint32 theParallelism;
Uint32 m_keyInfo;
NdbApiSignal* theSCAN_TABREQ;
int getFirstATTRINFOScan();
int doSendScan(int ProcessorId);
int prepareSendScan(Uint32 TC_ConnectPtr, Uint64 TransactionId);
int fix_receivers(Uint32 parallel);
void reset_receivers(Uint32 parallel, Uint32 ordered);
Uint32* m_array; // containing all arrays below
Uint32 m_allocated_receivers;
NdbReceiver** m_receivers; // All receivers
Uint32* m_prepared_receivers; // These are to be sent
Uint32 m_current_api_receiver;
Uint32 m_api_receivers_count;
NdbReceiver** m_api_receivers; // These are currently used by api
Uint32 m_conf_receivers_count; // NOTE needs mutex to access
NdbReceiver** m_conf_receivers; // receive thread puts them here
Uint32 m_sent_receivers_count; // NOTE needs mutex to access
NdbReceiver** m_sent_receivers; // receive thread puts them here
int send_next_scan(Uint32 cnt, bool close);
void receiver_delivered(NdbReceiver*);
void receiver_completed(NdbReceiver*);
void execCLOSE_SCAN_REP();
int getKeyFromKEYINFO20(Uint32* data, unsigned size);
NdbOperation* takeOverScanOp(OperationType opType, NdbConnection*);
Uint32 m_ordered;
int restart();
};
inline
NdbScanOperation::CursorType
NdbScanOperation::get_cursor_type() const {
return m_cursor_type;
}
#endif
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