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Matlab LevelDB

Matlab LevelDB wrapper designed for UNIX environment.

The implementation is based on mexplus.

• LevelDB

See also matlab-lmdb.

Build

As a prerequisite, LevelDB must be installed. In Linux, install via a package manager, e.g.,

apt-get install libleveldb-dev

Launch Matlab and do the following.

addpath /path/to/matlab-leveldb;
leveldb.make();
leveldb.make('test');

The leveldb.make() function internally calls GNU Make. By default, the build process automatically downloads a leveldb source package from GitHub. Edit Makefile to customize the build process.

Example

% Open and close.
database = leveldb.DB('./db');
clear database;

% Read and write.
database.put('key1', 'value1');
database.put('key2', 'value2');
value1 = database.get('key1');
database.remove('key1');

% Transaction.
batch = leveldb.WriteBatch();
batch.put('key3', 'value3');
batch.put('key4', 'value4');
database.write(batch);

% High-level iterator.
database.each(@(key, value) disp([key, ': ', value]));
count = database.reduce(@(key, value, count) count + 1, 0);

% Low-level iterator.
it = database.iterator();
while it.next()
  fprintf('%s: %s\n', it.key, it.value);
end
clear it;

% Dump.
keys = database.keys();
values = database.values();