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one/include/ObjectSQL.h
2009-01-26 18:25:15 +00:00

105 lines
3.3 KiB
C++

/* -------------------------------------------------------------------------- */
/* Copyright 2002-2009, Distributed Systems Architecture Group, Universidad */
/* Complutense de Madrid (dsa-research.org) */
/* */
/* Licensed under the Apache License, Version 2.0 (the "License"); you may */
/* not use this file except in compliance with the License. You may obtain */
/* a copy of the License at */
/* */
/* http://www.apache.org/licenses/LICENSE-2.0 */
/* */
/* Unless required by applicable law or agreed to in writing, software */
/* distributed under the License is distributed on an "AS IS" BASIS, */
/* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. */
/* See the License for the specific language governing permissions and */
/* limitations under the License. */
/* -------------------------------------------------------------------------- */
#ifndef OBJECT_SQL_H_
#define OBJECT_SQL_H_
#include "SqliteDB.h"
using namespace std;
/**
* ObjectSQL class. Provides a SQL backend interface, it should be implemented
* by persistent objects.
*/
class ObjectSQL
{
public:
ObjectSQL(){};
virtual ~ObjectSQL(){};
protected:
/**
* Gets the value of a column in the pool for a given object
* @param db pointer to Database
* @param table supporting the object
* @param column to be selected
* @param where contidtion to select the column
* @param value of the column
* @return 0 on success
*/
int select_column(
SqliteDB * db,
const string& table,
const string& column,
const string& where,
string * value);
/**
* Sets the value of a column in the pool for a given object
* @param db pointer to Database
* @param table supporting the object
* @param column to be selected
* @param where contidtion to select the column
* @param value of the column
* @return 0 on success
*/
int update_column(
SqliteDB * db,
const string& table,
const string& column,
const string& where,
const string& value);
/**
* Reads the ObjectSQL (identified with its OID) from the database.
* @param db pointer to the db
* @return 0 on success
*/
virtual int select(
SqliteDB * db) = 0;
/**
* Writes the ObjectSQL in the database.
* @param db pointer to the db
* @return 0 on success
*/
virtual int insert(
SqliteDB * db) = 0;
/**
* Updates the ObjectSQL in the database.
* @param db pointer to the db
* @return 0 on success
*/
virtual int update(
SqliteDB * db) = 0;
/**
* Removes the ObjectSQL from the database.
* @param db pointer to the db
* @return 0 on success
*/
virtual int drop(
SqliteDB * db) = 0;
};
#endif /*OBJECT_SQL_H_*/