You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
92 lines
2.7 KiB
92 lines
2.7 KiB
//
|
|
// Database.h
|
|
//
|
|
// Database: Class which defines the interface to a generic,
|
|
// simple database.
|
|
//
|
|
// Part of the ht://Dig package <http://www.htdig.org/>
|
|
// Copyright (c) 1999-2004 The ht://Dig Group
|
|
// For copyright details, see the file COPYING in your distribution
|
|
// or the GNU Library General Public License (LGPL) version 2 or later
|
|
// <http://www.gnu.org/copyleft/lgpl.html>
|
|
//
|
|
// $Id: Database.h,v 1.15 2004/05/28 13:15:20 lha Exp $
|
|
//
|
|
|
|
#ifndef _Database_h_
|
|
#define _Database_h_
|
|
|
|
#include "Object.h"
|
|
#include "htString.h"
|
|
|
|
#include <db.h>
|
|
|
|
// Database Types
|
|
// defined in db.h
|
|
// #define DB_BTREE 1
|
|
// #define DB_HASH 2
|
|
#ifndef GDBM_HASH
|
|
#define GDBM_HASH 2
|
|
#endif
|
|
|
|
|
|
class Database : public Object
|
|
{
|
|
//
|
|
// Make sure no one can actually create an object of this type or
|
|
// the derived types. The static getDatabaseInstance() method needs to be
|
|
// used.
|
|
//
|
|
protected:
|
|
Database();
|
|
public:
|
|
~Database();
|
|
|
|
//
|
|
// Since the contructor is protected, the only way to actually get
|
|
// a Database object is through the following class method.
|
|
// The idea here is that the particular type of database used by
|
|
// all the programs is to be defined in one place.
|
|
//
|
|
static Database *getDatabaseInstance(DBTYPE type);
|
|
|
|
//
|
|
// Common interface
|
|
//
|
|
virtual int OpenReadWrite(const char *filename, int mode = 0666) = 0;
|
|
virtual int OpenRead(const char *filename) = 0;
|
|
void SetCompare(int (*func)(const DBT *a, const DBT *b)) { _compare = func; }
|
|
void SetPrefix(size_t (*func)(const DBT *a, const DBT *b)) { _prefix = func; }
|
|
virtual int Close() = 0;
|
|
virtual int Put(const String &key, const String &data) = 0;
|
|
virtual int Get(const String &key, String &data) = 0;
|
|
virtual int Exists(const String &key) = 0;
|
|
virtual int Delete(const String &key) = 0;
|
|
|
|
virtual void Start_Get() = 0;
|
|
virtual char *Get_Next() { String item; String key; return Get_Next(item, key); }
|
|
virtual char *Get_Next(String &item) { String key; return Get_Next(item, key); }
|
|
virtual char *Get_Next(String &item, String &key) = 0;
|
|
virtual void Start_Seq(const String& str) = 0;
|
|
virtual char *Get_Next_Seq() { return Get_Next(); }
|
|
|
|
protected:
|
|
int isOpen;
|
|
DB *dbp; // database
|
|
DBC *dbcp; // cursor
|
|
|
|
String skey; // Next key to search for iterator
|
|
String data; // Next data to return for iterator
|
|
String lkey; // Contains the last key returned by iterator
|
|
|
|
DB_ENV *dbenv; // database enviroment
|
|
int (*_compare)(const DBT *a, const DBT *b); // Key comparison
|
|
size_t (*_prefix)(const DBT *a, const DBT *b); // Key reduction
|
|
|
|
int seqrc;
|
|
int seqerr;
|
|
DBTYPE db_type;
|
|
};
|
|
|
|
#endif
|