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/*
Header File Entity Manager
Copyright (C) 2013 Christian Ehringfeld <c.ehringfeld@t-online.de>

This file is part of OpenTeacherTool.

OpenTeacherTool 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.

OpenTeacherTool 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 OpenTeacherTool. If not, see <http://www.gnu.org/licenses/>.
*/

#ifndef ENTITYMANAGER_H
#define ENTITYMANAGER_H
#include <QtSql/QSqlDatabase>
#include <QtSql/QSqlRecord>
#include <QtSql/QSqlField>
#include <QString>
#include <QStringList>
#include <QDebug>
#include <QtSql/QSqlError>
#include "entity.h"
#include "database.h"

namespace OpenTeacherTool {

class EntityManager
{
private:
static QStringList connectionNames;
static void setConnectionNames(QStringList list);
Database *db;
QString createConnection();
QString createTableQuery(Entity *entity);
QString attributes(QHash<QString, QVariant> *m, QString conjunction=",", bool ignoreID = false);
QList<QHash<QString, QVariant> > convertQueryResult(QSqlQuery &q);
bool checkTable(Entity *entity);
QString buildCreateQuery(QHash<QString,QVariant>::const_iterator i, QHash<QString,QVariant>::const_iterator end,QString &p1, QString &p2);
void bindValues(const QHash<QString, QVariant> *h, QSqlQuery &q, bool ignoreID = false);

protected:
QString where(Entity *entity,QString conjunction=",",bool ignoreID = false);
QString where(QHash<QString, QVariant> *m,QString conjunction=",", bool ignoreID = false);

public:
EntityManager(QSqlDatabase database);
EntityManager(const QString &databaseType, QString databasename = "" , QString hostname="", QString username ="", QString password="", QString port="");
~EntityManager();
static QStringList getConnectionNames();
static void removeConnectionName(const QString &name);
bool create(Entity *entity);
bool save(Entity *entity);
qint64 findId(Entity *entity);
QList<QHash<QString,QVariant> > findAll(QString tblname);
QHash<QString,QVariant> find(qint64 id, QString tblname);
QList<QHash<QString, QVariant> > findByAttributes(Entity *entity,bool ignoreID = false);
QList<QHash<QString, QVariant> > findByAttributes(QHash<QString, QVariant> *m, const QString &tblname, bool ignoreID = false);
bool merge(Entity *entity);
bool remove(Entity *&entity);
bool removeAll(QString tblname);
bool createTable(Entity *entity);
qint8 count(Entity* entity, bool ignoreID= true);
};
}
#endif // ENTITYMANAGER_H
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