https://github.com/sethvincent/level-simple-indexes
Create multiple indexes of data stored in a levelup database using level-indexer.
https://github.com/sethvincent/level-simple-indexes
leveldb levelup
Last synced: 8 months ago
JSON representation
Create multiple indexes of data stored in a levelup database using level-indexer.
- Host: GitHub
- URL: https://github.com/sethvincent/level-simple-indexes
- Owner: sethvincent
- License: mit
- Created: 2015-05-29T20:16:37.000Z (almost 11 years ago)
- Default Branch: master
- Last Pushed: 2017-02-17T20:47:04.000Z (about 9 years ago)
- Last Synced: 2025-07-29T23:22:18.123Z (10 months ago)
- Topics: leveldb, levelup
- Language: JavaScript
- Homepage:
- Size: 14.6 KB
- Stars: 6
- Watchers: 2
- Forks: 2
- Open Issues: 1
-
Metadata Files:
- Readme: README.md
- License: LICENSE.md
Awesome Lists containing this project
README
# level-simple-indexes
Create multiple indexes of data stored in a [levelup](http://npmjs.org/levelup) database using [level-indexer](http://npmjs.org/level-indexer).
## Installation
```
npm install --save level-simple-indexes
```
## Examples
### Basic usage
```js
var memdb = require('memdb')
var sublevel = require('subleveldown')
var createIndexer = require('./index')
var db = sublevel(memdb(), { valueEncoding: 'json' })
var indexdb = sublevel(db, 'indexes')
var indexer = createIndexer(indexdb, {
properties: ['ingredients.sauce', 'ingredients.toppings.meat'],
map: function (key, next) {
db.get(key, next)
}
})
var data = {
key: 'pizza',
ingredients: {
sauce: 'tomato',
toppings: {
cheese: 'cheddar',
meat: ['pepperoni', 'sausage'],
vegetables: ['onion', 'bell pepper']
}
}
}
db.put(data.key, data, function (err) {
if (err) console.log(err)
indexer.addIndexes(data, function () {
indexer.findOne('ingredients.toppings.meat', 'sausage', function (err, result) {
if (err) console.log(err)
console.log(result)
})
})
})
```
### Creating an index with multiple keys
```js
var memdb = require('memdb')
var sublevel = require('subleveldown')
var createIndexer = require('./index')
var db = sublevel(memdb(), { valueEncoding: 'json' })
var indexdb = sublevel(db, 'indexes')
var indexer = createIndexer(indexdb, {
properties: [['title', 'description']],
map: function (key, next) {
db.get(key, next)
}
})
var data = { key: 'foo', title: 'pepperoni', description: 'very good' }
db.put(data.key, data, function (err) {
indexer.addIndexes(data, function () {
indexer.findOne('title!description', data, function (err, result) {
console.log(err, result)
})
})
})
```
## License
[MIT](LICENSE.md)