This is the MongoDB driver for Databank.
Copyright 2011-2015 E14N https://e14n.com/
Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at
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To create a MongoDB databank, use the Databank.get()
method:
var Databank = require('databank').Databank;
var db = Databank.get('mongodb', {});
The driver takes the following parameters:
host
: the host to connect to. Defaults to localhost
.port
: the port to connect to. Defaults to 27017
.dbname
: the database to use. Defaults to test
.dbuser
: the username. Defaults to null, meaning no authentication.dbpass
: the password. Defaults to null.schema
: the database schema, as described in the Databank README.checkSchema
: whether to synchronize the database with the schema
argument at connection time. Defaults to true
.rs_name
: replica set name to use. If this is set, host
and port
are ignored.hosts
: array of hosts in the replica set you want to connect to.
These can be either arrays of [host, port] or strings (meaning use
the default port).Databank "types" map to MongoDB collections.
The "pkey" of a schema will be mapped to the _id value in the database. For example, consider a schema with a single type, like the following:
{"person": {"pkey": "username"}}
An object like the following:
{"username": "evanp", "age": 43}
...would be stored in the database as:
{"_id": "evanp", "age": 43}
The "indices" in a schema will be used to create indices in the database.
Arrays and integers are stored in wrapped objects. The following call creates a new array:
var db = Databank.get("mongo", {});
db.connect({}, function(err) {
db.create("friends", "frodo", ["sam", "merry", "pippin"], function(err, friendsList) {
// done
});
});
The stored object in the "friends" collection in MongoDB looks like:
{"_id": "frodo", "_v": ["sam", "merry", "pippin"], "_s": true}
Here, the value is stored in the "_v" field, and the "_s" field stores a flag indicating that we've made a little shim.
Similarly for integer types:
db.incr("age", "evanp", function(err, newAge) { });
The stored object will be:
{"_id": "evanp", "_v": 43, "_s": true}
Atomic changes are made for most of the methods.