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#ifndef __DB_H
#define __DB_H
#include <string>
#include <list>
#include <map>
#include <db_cxx.h>
#include "util.hh"
using namespace std;
class Database;
class Transaction
{
friend class Database;
private:
DbTxn * txn;
public:
Transaction();
Transaction(Database & _db);
~Transaction();
void abort();
void commit();
void moveTo(Transaction & t);
};
#define noTxn Transaction()
typedef unsigned int TableId; /* table handles */
class Database
{
friend class Transaction;
private:
DbEnv * env;
int fdLock;
int fdAccessors;
TableId nextId;
map<TableId, Db *> tables;
void requireEnv();
Db * getDb(TableId table);
public:
Database();
~Database();
void open(const string & path);
void close();
TableId openTable(const string & table);
bool queryString(const Transaction & txn, TableId table,
const string & key, string & data);
bool queryStrings(const Transaction & txn, TableId table,
const string & key, Strings & data);
void setString(const Transaction & txn, TableId table,
const string & key, const string & data);
void setStrings(const Transaction & txn, TableId table,
const string & key, const Strings & data,
bool deleteEmpty = true);
void delPair(const Transaction & txn, TableId table,
const string & key);
void enumTable(const Transaction & txn, TableId table,
Strings & keys);
};
#endif /* !__DB_H */
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