NAME

UnQLite - Perl bindings for UnQLite

SYNOPSIS

use UnQLite;

my $db = UnQLite->open('foo.db', UNQLITE_OPEN_READWRITE|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_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_OPEN_CREATE      (Default)
  UNQLITE_OPEN_READONLY
  UNQLITE_OPEN_READWRITE
  UNQLITE_OPEN_EXCLUSIVE
  UNQLITE_OPEN_TEMP_DB
  UNQLITE_OPEN_OMIT_JOURNALING
  UNQLITE_OPEN_IN_MEMORY
  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_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