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/* Copyright 2002-2019, OpenNebula Project, OpenNebula Systems                */
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/* Licensed under the Apache License, Version 2.0 (the "License"); you may    */
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/* a copy of the License at                                                   */
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/* http://www.apache.org/licenses/LICENSE-2.0                                 */
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/* Unless required by applicable law or agreed to in writing, software        */
/* distributed under the License is distributed on an "AS IS" BASIS,          */
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/* -------------------------------------------------------------------------- */

#ifndef OBJECT_SQL_H_
#define OBJECT_SQL_H_

#include "Callbackable.h"
#include "SqlDB.h"

using namespace std;

/**
 * ObjectSQL class. Provides a SQL backend interface, it should be implemented
 * by persistent objects.
 */
class ObjectSQL : public Callbackable
{
public:

    ObjectSQL(){};

    virtual ~ObjectSQL(){};

protected:
    /**
     *  Reads the ObjectSQL (identified with its OID) from the database.
     *    @param db pointer to the db
     *    @return 0 on success
     */
    virtual int select(
        SqlDB * db) = 0;

    /**
     *  Writes the ObjectSQL in the database.
     *    @param db pointer to the db
     *    @return 0 on success
     */
    virtual int insert(
        SqlDB * db,
        string& error_str) = 0;

    /**
     *  Updates the ObjectSQL in the database.
     *    @param db pointer to the db
     *    @return 0 on success
     */
    virtual int update(
        SqlDB * db) = 0;

    /**
     *  Removes the ObjectSQL from the database.
     *    @param db pointer to the db
     *    @return 0 on success
     */
    virtual int drop(
        SqlDB * db) = 0;
};

#endif /*OBJECT_SQL_H_*/