Database::Creator< T > Class Template Reference

to create records in the berkeley db. More...

#include <generaldata.h>

Collaboration diagram for Database::Creator< T >:

[legend]List of all members.

Public Member Functions
	Creator (TrapperDoc *doc, std::string dataType)
	constructor
	~Creator ()
db_recno_t	create (bool useRecno, DbTxn *txnid=NULL)
	create a new record in the berkeley db
void	destroy (DbTxn *txnid=NULL)
	Removes a record from the DB.
T *	data ()
	returns a pointer to the data
Protected Attributes
T *	m_data
Db *	m_db

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Detailed Description

template<class T>
class Database::Creator< T >

to create records in the berkeley db.

Parameters:

T

the derived GeneralData class that the pointer data() points to. By having this template argument we avoid the need of dynamic_cast by the users of this class.

Definition at line 169 of file generaldata.h.

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Constructor & Destructor Documentation

template<class T>

Database::Creator< T >::Creator	(	TrapperDoc *	doc,
		std::string	dataType
	)

constructor

Parameters:

	doc	doc with the berkeley dbs opened
	dataType	the lookup string for the derived GeneralData class that are to be stored.

Definition at line 199 of file generaldata.h.

References TrapperDoc::findTrDb(), Database::Creator< T >::m_data, Database::Creator< T >::m_db, GeneralMaker::newData(), and TrDb::primaryDb().

  {
    m_data = dynamic_cast< T * >(GeneralMaker::newData( dataType ));
    Q_CHECK_PTR( m_data );
    std::string datatype = m_data->uniqueName();
    m_db = doc->findTrDb( datatype )->primaryDb();
//     cerr<<"In Creator(), doc: "<<doc<<endl;
  }

template<class T>

Database::Creator< T >::~Creator

(

)

Definition at line 209 of file generaldata.h.

References Database::Creator< T >::m_data.

  {
    Q_CHECK_PTR( m_data );
    delete m_data;
  }

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Member Function Documentation

template<class T>

db_recno_t Database::Creator< T >::create	(	bool	useRecno,
		DbTxn *	txnid = NULL
	)

create a new record in the berkeley db

Parameters:

	useRecno	if true save at the index place of given from the GeneralData::getRecno() of the data(). If false a new recno value is automatically chosen by berkeley db.
	txnid	a transaction id to encompass this operation in. If NULL this operation will not be transaction-protected.

Definition at line 216 of file generaldata.h.

References Database::Creator< T >::data(), Database::Creator< T >::m_data, and Database::Creator< T >::m_db.

Referenced by MacsimParser::endElement(), TrapperDoc::importChromat(), TrapperDoc::importPhd(), optimize_layout(), TrapperView::readSelected(), and MoveAlgo::start().

  {
//     std::cerr<<"In "<<std::endl;
//     std::cerr<<"txnid: "<<txnid<<std::endl;
    QByteArray ar;
    QDataStream stream( ar, IO_WriteOnly );
//     std::cerr<<"Check1 "<<std::endl;
    m_data->writeStream( stream );
//     std::cerr<<"Check2 "<<std::endl;
    
    Dbt data( ar.data(), ar.size() );
//     std::cerr<<"Check3 "<<std::endl;
    Dbt key;

    //     db_recno_t recno;
    db_recno_t the_recno(0);//EA
    u_int32_t flags = 0;
    if ( useRecno )
      {
//         std::cerr<<"Check4:1 "<<std::endl;
        the_recno = m_data->getRecno();
        key.set_data( &the_recno );
        key.set_size( sizeof( the_recno ) );
      }
    else
      {
//         std::cerr<<"Check4:2 "<<std::endl;
        flags |= DB_APPEND;
        assert( flags == DB_APPEND );
      }
//     std::cerr<<"Check5 "<<std::endl;
//     std::cerr<<"Db: "<<m_db<<std::endl;
//     m_data->print_debug_info();
//     std::cerr<<"Back from debug "<<endl;
    
    int ret;
    if ((ret = m_db->put(txnid, &key, &data, flags )) != 0)
      {
//         std::cerr<<"Check5:1 "<<std::endl;
        m_db->err(ret, "error in create");
//         std::cerr<<"Check5:2 "<<std::endl;
        exit( 1 );
      }
//     std::cerr<<"Check6 "<<std::endl;
    db_recno_t recnoRet = * static_cast< db_recno_t * >( key.get_data() );
//     std::cerr<<"Out "<<std::endl;
    return recnoRet;
  }

template<class T>

void Database::Creator< T >::destroy

(

DbTxn *

txnid = NULL

)

Removes a record from the DB.

Definition at line 265 of file generaldata.h.

References Database::Creator< T >::m_data, and Database::Creator< T >::m_db.

Referenced by Destroyer::destroy().

  {
    Dbt key;

    db_recno_t the_recno(0);
    u_int32_t flags = 0;
    the_recno = m_data->getRecno();
    key.set_data( &the_recno );
    key.set_size( sizeof( the_recno ) );
    
    int ret;
    if ((ret = m_db->del(txnid, &key, flags )) != 0)
      {
        m_db->err(ret, "error in Creator::destroy");
        exit( 1 );
      }
  }

template<class T>

T* Database::Creator< T >::data

(

)

[inline]

returns a pointer to the data

Definition at line 192 of file generaldata.h.

References Database::Creator< T >::m_data.

Referenced by Database::Creator< T >::create(), Destroyer::destroy(), MacsimParser::endElement(), TrapperDoc::import(), TrapperDoc::importChromat(), TrapperDoc::importPhd(), optimize_layout(), TrapperView::readSelected(), and MoveAlgo::start().

{ return m_data; }

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Member Data Documentation

template<class T>

T* Database::Creator< T >::m_data [protected]

Definition at line 194 of file generaldata.h.

Referenced by Database::Creator< T >::create(), Database::Creator< T >::Creator(), Database::Creator< T >::data(), Database::Creator< T >::destroy(), and Database::Creator< T >::~Creator().

template<class T>

Db* Database::Creator< T >::m_db [protected]

Definition at line 195 of file generaldata.h.

Referenced by Database::Creator< T >::create(), Database::Creator< T >::Creator(), and Database::Creator< T >::destroy().

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The documentation for this class was generated from the following file:

• generaldata.h

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