NAME

UnQLite - Perl bindings for UnQLite

SYNOPSIS

    use UnQLite;

    my $db = UnQLite->open('foo.db', UnQLite::UNQLITE_OPEN_READWRITE|UnQLite::UNQLITE_OPEN_CREATE);
    $db->kv_store('foo', 'bar');
    say $db->kv_fetch('foo'); # => bar
    $db->kv_delete('foo');
    undef $db; # close database

    # tie interface
    tie my %hash, 'UnQLite', 'foo.db', UnQLite::UNQLITE_OPEN_READWRITE;
    $hash{foo} = 'bar';
    say $hash{foo}; # => bar

DESCRIPTION

UnQLite is a in-process software library which implements a self-contained, serverless, zero-configuration, transactional NoSQL database engine. UnQLite is a document store database similar to MongoDB, Redis, CouchDB etc. as well a standard Key/Value store similar to BerkeleyDB, LevelDB, etc.

This module is Perl5 binding for UnQLite.

If you want to know more information about UnQLite, see http://unqlite.org/.

This version of UnQLite.pm does not provides document store feature. Patches welcome.

You can use UnQLite.pm as DBM.

METHODS

my $db = UnQLite->open('foo.db'[, $mode]);

Open the database.

Modes:

    UnQLite::UNQLITE_OPEN_CREATE      (Default)
    UnQLite::UNQLITE_OPEN_READONLY
    UnQLite::UNQLITE_OPEN_READWRITE
    UnQLite::UNQLITE_OPEN_EXCLUSIVE
    UnQLite::UNQLITE_OPEN_TEMP_DB
    UnQLite::UNQLITE_OPEN_OMIT_JOURNALING
    UnQLite::UNQLITE_OPEN_IN_MEMORY
    UnQLite::UNQLITE_OPEN_MMAP

$db->kv_store($key, $value);

Store the entry to database.

$db->kv_fetch($key);

Fetch data from database.

$db->kv_delete($key);

Delte $key from database.

$db->rc();

Return code from UnQLite. It may updates after any UnQLite API call.

$db->errstr()

This API returns stringified version of $db->rc(). It's not human readable but it's better than magic number.

my $cursor = $db->cursor_init()

Create new cursor object.

UnQLite::Cursor

UnQLite supports cursor for iterating entries.

Here is example code:

    my $cursor = $db->cursor_init();
    my @ret;
    for ($cursor->first_entry; $cursor->valid_entry; $cursor->next_entry) {
        push @ret, $cursor->key(), $cursor->data()
    }

METHODS

$cursor->first_entry()

Seek cursor to first entry.

Return true if succeeded, false otherwise.

$cursor->last_entry()

Seek cursor to last entry.

Return true if succeeded, false otherwise.

$cursor->valid_entry()

This will return 1 when valid. 0 otherwise

$cursor->key()

Get current entry's key.

$cursor->data()

Get current entry's data.

$cursor->next_entry()

Seek cursor to next entry.

$cursor->prev_entry()

Seek cursor to previous entry.

Return true if succeeded, false otherwise.

$cursor->seek($key, $opt=UnQLite::UNQLITE_CURSOR_MATCH_EXACT)

Seek cursor to $key .

You can specify the option as $opt . Please see http://unqlite.org/c_api/unqlite_kv_cursor.html for more details.

Return true if succeeded, false otherwise.

$cursor->delete_entry()

Delete the database entry pointed by the cursor.

Return true if succeeded, false otherwise.

LICENSE

Copyright (C) tokuhirom.

This library is free software; you can redistribute it and/or modify it under the same terms as Perl itself.

AUTHOR

tokuhirom <tokuhirom@gmail.com>