store

A key/value database.

Synopsis

using store = basic_store< xxhasher, native_file >;

store::store

nudb::basic_store

nudb__basic_store

Types

Name	Description
file_type
hash_type

Member Functions

Name	Description
appnum	Return the appnum associated with the database.
basic_store	Default constructor. Copy constructor (disallowed)
block_size	Return the block size associated with the database.
close	Close the database.
dat_path	Return the path to the data file.
fetch	Fetch a value.
insert	Insert a value.
is_open	Returns true if the database is open.
key_path	Return the path to the key file.
key_size	Return the key size associated with the database.
log_path	Return the path to the log file.
open	Open a database.
operator=	Copy assignment (disallowed)
set_burst	Set the burst size.
~basic_store	Destroy the database.

To create a database first call the create free function. Then construct a basic_store and call basic_store::open on it:

error_code ec;
create<xxhasher>(
    "db.dat", "db.key", "db.log",
        1, make_salt(), 8, 4096, 0.5f, ec);
basic_store<xxhasher, native_file> db;
db.open("db.dat", "db.key", "db.log", ec);

Template Parameters

Type	Description
`Hasher`	The hash function to use. This type must meet the requirements of Hasher.
`File`	The type of File object to use. This type must meet the requirements of File.

Description

The Hasher used is is xxhasher, which works very well for almost all cases. The File is native_file which works on Windows and POSIX platforms.

Header

#include <nudb/store.hpp>