MongoDB-like interface for HTML5 IndexedDB
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.
``javascript
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 }
ZangoDB is available as an npm package, and the web-browser build can be downloaded here or embedded:
`html`
For certain web browsers, such as Internet Explorer, the Babel polyfill is required and must be loaded before ZangoDB:
`html`
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:
`javascript`
global.indexedDB = require('fake-indexeddb');
global.IDBKeyRange = require('fake-indexeddb/lib/FDBKeyRange');
The following filter operators are supported: $and, $or, $not, $nor, $eq, $ne, $gt, $gte, $lt, $lte, $in, $nin, $elemMatch, $regex, and $exists.
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.
The following update operators are supported: $set, $unset, $rename, $inc, $mul, $min, $max, $push, $pop, $pullAll, $pull, and $addToSet.
The following group operators are supported: $sum, $avg, $min, $max, $push, and $addToSet.
The following aggregation pipeline stages are supported: $match, $project, $group, $unwind, $sort, $skip, and $limit`.
MIT, please view the LICENSE file.