Implement read and write concerns

[thekid]

This pull request adds readConcern() and writeConcern() method to the Options class.

ℹ️ This pull request does not include concern inheritance (connection -> database -> collection (-> session) -> command) as described in https://www.mongodb.com/docs/manual/reference/mongodb-defaults/. This requires us to know which command to pass readConcern to and which ones support writeConcern, as doing otherwise results in errors, see #11 (comment).

Read concerns

use com\mongodb\{Collection, Options};

$coll= $conn->collection('test', 'tests');
$coll->find([], (new Options())->readConcern('local'));

Write concerns

use com\mongodb\{Collection, Options, ObjectId};

$coll= $conn->collection('test', 'tests');
$coll->update(new ObjectId('...'), $operations, (new Options())->writeConcern('majority'));

See also

• Support read and write concerns #11
• https://www.mongodb.com/docs/manual/reference/read-concern/
• https://www.mongodb.com/docs/manual/reference/write-concern/

[thekid]

Released in https://github.com/xp-forge/mongodb/releases/tag/v2.0.0