EJDB - Embedded JSON Database engine
Required tools/system libraries:
- g++/gcc
- Matlab
Launch matlab, add a path to matlab-ejdb
, and use ejdb.make
command.
addpath /path/to/matlab-ejdb;
ejdb.make
By default, this will download the latest EJDB package from GitHub and create
a statically linked binary. If you prefer to link dynamically, specify
--download-ejdb
to false and pass any additional flags. For example,
ejdb.make('--download-ejdb', false, ...
'-I/opt/local/include', ...
'-L/opt/local/lib');
In most cases, you'll need to force Matlab to preload the system libstdc++ due
to the incompatibility between the system and Matlab's internal libstdc++
version. Use LD_PRELOAD
variable to do so. For example, in Ubuntu 12.04 LTS
64-bit,
LD_PRELOAD=/usr/lib/x86_64-linux-gnu/libstdc++.so.6:/lib/x86_64-linux-gnu/libgcc_s.so.1 matlab
The required path depends on the platform. You can check which path to specify
by comparing the output of ldd
tool in the UNIX shell and in Matlab.
From the UNIX shell,
$ ldd +ejdb/private/libejdbmex.mex*
From Matlab shell,
>> !ldd +ejdb/private/libejdbmex.mex*
And find a dependent library differing in Matlab. You must append that library
in the LD_PRELOAD
path.
In OS X, LD_PRELOAD
equivalent is DYLD_INSERT_LIBRARIES
. Use otool -L
command instead of ldd
.
addpath /path/to/matlab-ejdb;
db_id = ejdb.open('zoo');
parrot1 = struct(...
'name', 'Grenny', ...
'type', 'African Grey', ...
'male', true, ...
'age', 1, ...
'birthdate', {bson.date(now)}, ...
'likes', {{'green color', 'night', 'toys'}}, ...
'extra1', []...
);
parrot2 = struct(...
'name', 'Bounty', ...
'type', 'Cockatoo', ...
'male', false, ...
'age', 15, ...
'birthdate', {bson.date(now)}, ...
'likes', {{'sugar cane', 'toys'}}, ...
'extra1', []...
);
object_ids = ejdb.save('parrots', parrot1, parrot2);
disp(['Grenny OID: ', object_ids{1}]);
disp(['Boundy OID: ', object_ids{2}]);
results = ejdb.find('parrots', {'likes', 'toys'});
disp(['Found ', num2str(numel(results)), ' parrots']);
for i = 1:numel(results)
disp([results(i).name, ' likes toys!']);
end
ejdb.close(db_id);
- Sparse array is not supported.