@iy4u/zangodb

ZangoDB is a MongoDB-like interface for HTML5 IndexedDB that supports most of the familiar filtering, projection, sorting, updating and aggregation features of MongoDB, for usage in the web browser.

Example

let db = new zango.Db('mydb', { people: ['age'] });
let people = db.collection('people');

let docs = [
    { name: 'Frank', age: 20 },
    { name: 'Thomas', age: 33 },
    { name: 'Todd', age: 33 },
    { name: 'John', age: 28 },
    { name: 'Peter', age: 33 },
    { name: 'George', age: 28 }
];

people.insert(docs).then(() => {
    return people.find({
        name: { $ne: 'John' },
        age: { $gt: 20 }
    }).group({
        _id: { age: '$age' },
        count: { $sum: 1 }
    }).project({
        _id: 0,
        age: '$_id.age'
    }).sort({
        age: -1
    }).forEach(doc => console.log('doc:', doc));
}).catch(error => console.error(error));

Which outputs:

doc: { count: 3, age: 33 }
doc: { count: 1, age: 28 }

Installation

ZangoDB is available as an npm package, and the web-browser build can be downloaded here or embedded:

<script src="https://unpkg.com/zangodb@latest/dist/zangodb.min.js"></script>

For certain web browsers, such as Internet Explorer, the Babel polyfill is required and must be loaded before ZangoDB:

<script src="https://cdnjs.cloudflare.com/ajax/libs/babel-polyfill/6.23.0/polyfill.min.js"></script>

ZangoDB then can be accessed using the global variable zango.

To install ZangoDB for usage with node:

$ npm install zangodb

In both cases, an implementation of IndexedDB is required. For environments without a native implementation of IndexedDB, Fake IndexedDB can be used:

global.indexedDB = require('fake-indexeddb');
global.IDBKeyRange = require('fake-indexeddb/lib/FDBKeyRange');

Document Language Operators

Filter Operators

The following filter operators are supported: $and, $or, $not, $nor, $eq, $ne, $gt, $gte, $lt, $lte, $in, $nin, $elemMatch, $regex, and $exists.

Expression Operators

Expression operators can be used in combination with the group and projection operators.

The following expression operators are supported: $literal, $add, $subtract, $multiply, $divide, $mod, $abs, $ceil, $floor, $ln, $log10, $pow, $sqrt, $trunc, $concat, $toLower, $toUpper, $concatArrays, $dayOfMonth, $year, $month, $hour, $minute, $second, and $millisecond.

Update Operators

The following update operators are supported: $set, $unset, $rename, $inc, $mul, $min, $max, $push, $pop, $pullAll, $pull, and $addToSet.

Group Operators

The following group operators are supported: $sum, $avg, $min, $max, $push, and $addToSet.

Aggregation Pipeline Stages

The following aggregation pipeline stages are supported: $match, $project, $group, $unwind, $sort, $skip, and $limit.

License

MIT, please view the LICENSE file.