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threadeddatabase.cpp
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threadeddatabase.cpp
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/*
Copyright (C) 2014 Sialan Labs
http://labs.sialan.org
Meikade 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 3 of the License, or
(at your option) any later version.
Meikade 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, see <http://www.gnu.org/licenses/>.
*/
#include "threadeddatabase.h"
#include "meikadedatabase.h"
#include "meikade_macros.h"
#include <QMutex>
#include <QSqlDatabase>
#include <QSqlQuery>
#include <QSqlRecord>
#include <QSqlError>
#include <QDir>
#include <QVariant>
#include <QDebug>
class ThreadedDatabasePrivate
{
public:
QString keyword;
int pointer;
int length;
bool reset;
QString path;
QMutex mutex;
QSqlDatabase db;
MeikadeDatabase *pdb;
QSqlQuery find_query;
};
ThreadedDatabase::ThreadedDatabase( MeikadeDatabase *pdb, QObject *parent) :
QThread(parent)
{
p = new ThreadedDatabasePrivate;
p->pointer = -1;
p->length = 0;
p->reset = false;
p->pdb = pdb;
connect( pdb, SIGNAL(initializeFinished()), SLOT(initialize()), Qt::QueuedConnection );
}
void ThreadedDatabase::initialize()
{
#ifdef Q_OS_ANDROID
p->path = "/sdcard/Sialan/Meikade/data.sqlite";
#else
p->path = HOME_PATH + "/data.sqlite";
#endif
p->db = QSqlDatabase::addDatabase( "QSQLITE", THREADED_DATA_DB_CONNECTION );
p->db.setDatabaseName(p->path);
p->db.open();
}
void ThreadedDatabase::find(const QString &keyword)
{
p->mutex.lock();
p->keyword = keyword;
p->pointer = -1;
p->length = 0;
p->reset = true;
p->mutex.unlock();
}
bool ThreadedDatabase::next(int length)
{
if( p->length == -1 )
{
emit noMoreResult();
return false;
}
p->mutex.lock();
p->length += length;
p->mutex.unlock();
start();
return true;
}
void ThreadedDatabase::run()
{
for( int i=p->pointer; i<p->length; i++ )
{
if( p->reset )
{
p->mutex.lock();
p->find_query = QSqlQuery(p->db);
p->find_query.prepare("SELECT poem_id, vorder FROM verse WHERE text LIKE :keyword");
p->find_query.bindValue(":keyword","%" + p->keyword + "%");
p->reset = false;
i = -1;
p->mutex.unlock();
p->find_query.exec();
}
if( !p->find_query.next() )
{
p->length = -1;
emit noMoreResult();
return;
}
QSqlRecord record = p->find_query.record();
if( !p->reset )
emit found( record.value(0).toInt(), record.value(1).toInt() );
p->pointer++;
}
}
ThreadedDatabase::~ThreadedDatabase()
{
delete p;
}