#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); void delPair(const Transaction & txn, TableId table, const string & key); void enumTable(const Transaction & txn, TableId table, Strings & keys); }; #endif /* !__DB_H */