Constant::Datastore Class Reference

#include <datastore.h>

Collaboration diagram for Constant::Datastore:

[legend]List of all members.

Public Member Functions
	Datastore ()
	Datastore (const std::string &filen)
	~Datastore ()
std::string	fetch (const std::string &key_val)
std::string	fetch_next ()
void	setdb (const std::string &filen)
std::string	operator[] (const std::string &)
void	initlog (const std::string &logfilen)
void	log (const std::string &, const std::string &)
void	commitlog ()
void	commitlog (const std::string &)
void	backupdb ()
void	dump (const std::string &dumpfilename)
std::pair< std::string, std::string >	first ()
std::pair< std::string, std::string >	next ()

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Detailed Description

Datastore is a c++ class providing access to DJB style constant db (cdb). The class really on has one method fetch that takes a string and returns a string

Definition at line 28 of file datastore.h.

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Constructor & Destructor Documentation

Constant::Datastore::Datastore (   )

Default constructor. Intialized everything to zero

Constant::Datastore::Datastore (  const std::string &  filen  )

constructor that sets the cdb to be filename Parameters: filen  -- file name for cdb

Constant::Datastore::~Datastore (   )

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Member Function Documentation

void Constant::Datastore::backupdb (   )

writes a backup of the current database in the form of DBFILENAME. where is the next highest number. It will fill in gaps, if you have backups of 1 2 3 5, the next sequence is 4 Exceptions: CANTBACKUPDB  Todo: backupdb and statdb need to be gerneralized for any file

void Constant::Datastore::commitlog (  const std::string &   )

Commit log with an argument sets the database to the name given by the argument and commits the log and sets the current database name

void Constant::Datastore::commitlog (   )

Commit log writes the information contained in the log to the current database. It does not Add to the current database. This is an atomic replacement

void Constant::Datastore::dump (  const std::string &  dumpfilename  )

dump out the current database in cdbmake format to the filename given by dumpfilename Parameters: dumpfilename  This is the name of the file to dump the current database to

std::string Constant::Datastore::fetch (  const std::string &  key_val  )

Parameters: key_val  -- key to find in the database. returns an empty string if nothing found, or database is bad

std::string Constant::Datastore::fetch_next (   )

fetches the next value stored for the previous key

std::pair<std::string,std::string> Constant::Datastore::first (   )

returns the first key->value pair in the database and sets things up so you can call next. Returns empty strings in the pair if there is no first key.

void Constant::Datastore::initlog (  const std::string &  logfilen  )

Open the log and set up for logging operations Parameters: logfilen  -- the filename to open

void Constant::Datastore::log (  const std::string &  , const std::string &  )

add entry to the log. This takes the key and data string and writes a log entry in cdb_make format

std::pair<std::string,std::string> Constant::Datastore::next (   )

returns the next key in the database, used with first. Returns empty strings in the pair at the end.

std::string Constant::Datastore::operator[] (  const std::string &   )

convienince operator to provide DATA = db[KEY] style use

void Constant::Datastore::setdb (  const std::string &  filen  )

Parameters: filen  -- set db to file reinitialized db if there's one already there

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The documentation for this class was generated from the following file:

• datastore.h

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