100 lines
3.3 KiB
Markdown
100 lines
3.3 KiB
Markdown
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A dead-simple promise wrapper for [nedb](https://github.com/louischatriot/nedb#readme).
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Check out the [docs](https://github.com/bajankristof/nedb-promises/blob/master/docs.md).
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##### IMPORTANT
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**As of `nedb-promises` `5.0.0` [nedb](https://github.com/louischatriot/nedb#readme) package has been replaced with a fork of the original package, [@seald-io/nedb](https://github.com/seald/nedb) to solve some vulnerability issues originating from `nedb`!**
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```js
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const Datastore = require('nedb-promises')
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let datastore = Datastore.create('/path/to/db.db')
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// #1
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datastore.find({ field: true })
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.then(...)
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.catch(...)
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// #2
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datastore.find({ field: true })
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.exec(...)
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.then(...)
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.catch(...)
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// #1 and #2 are equivalent
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datastore.findOne({ field: true })
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.then(...)
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.catch(...)
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datastore.insert({ doc: 'yourdoc' })
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.then(...)
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.catch(...)
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// or in an async function
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async function findSorted(page, perPage = 10) {
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return await datastore.find(...)
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.sort(...)
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.limit(perPage)
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.skip(page * perPage)
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}
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```
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### Installation
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```sh
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npm install --save nedb-promises
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```
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### Usage
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Everything works as the original module, with a couple of exceptions:
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* There are no callbacks.
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* `loadDatabase` has been renamed to [`load`](https://github.com/bajankristof/nedb-promises/blob/master/docs.md#Datastore+load).
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* The cursor's `projection` method has been renamed to [`project`](https://github.com/bajankristof/nedb-promises/blob/master/docs.md#Cursor+project).
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* You should call `Datastore.create(...)` instead of `new Datastore(...)`. This way you can access the original [nedb](https://github.com/louischatriot/nedb#readme) properties, such as `datastore.persistence`.
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* As of v2.0.0 the module supports events 😎... Check out the [docs about events](https://github.com/bajankristof/nedb-promises/blob/master/docs.md#Datastore)!
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Check out the [original docs](https://github.com/louischatriot/nedb#readme)!
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#### load( )
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You don't need to call this as the module will automatically detect if the datastore has been loaded or not upon calling any other method.
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```js
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const Datastore = require('nedb-promises')
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let datastore = Datastore.create('/path/to/db.db')
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datastore.load(...)
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.then(...)
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.catch(...)
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```
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#### find( [query], [projection] ), findOne( [query], [projection] ), count( [query] )
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These methods will return a Cursor object that works the same way it did before except when you call "exec" it takes no arguments and returns a Promise.
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The cool thing about this implementation of the Cursor is that it behaves like a Promise. Meaning that you can `await` it and you can call `.then()` on it.
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```js
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const Datastore = require('nedb-promises')
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let datastore = Datastore.create('/path/to/db.db')
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//outside Promise chain
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datastore.find(...)
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.then(...)
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.catch(...)
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//insinde Promise chain
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datastore.insert(...)
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.then(() => {
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return datastore.find(...)
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})
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.then(
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// use the retrieved documents
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)
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;(async () => {
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await datastore.find(...).sort(...).limit()
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})()
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```
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#### other( ... )
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All the other methods will take the same arguments as they did before (except the callback) and will return a Promise.
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Check out the [docs](https://github.com/bajankristof/nedb-promises/blob/master/docs.md).
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