LowDB - 基于Node的纯Json文件数据库

• 无需服务器
• 快速
• 事件触发
• 来自Lo-Dash的50多种方法

用法

var low = require('lowdb')
low('songs').insert({title: 'low!'})

{
  "songs": [
    {
      "title": "low!",
      "id": "e31aa48c-a9d8-4f79-9fce-ded4c16c3c4c"
    }
  ]
}

var songs = low('songs').where({ title: 'low!' }).value()

var songs = low('songs', { title: 'low!' })

low.on('add', function(name, object) {
  console.log(object + 'added to' + name)
})

查询    x 1000    0.837708 ms
更新 x 1000    4.433322 ms
插入x 1000    11.78481 ms
删除x 1000    24.60179 ms

应用程序接口

low(collection)

var topFiveSongs = low('songs')
  .where({published: true})
  .sortBy('views')
  .first(5)
  .value();
 
var songTitles = low('songs')
  .pluck('titles')
  .value()
 
var total = low('songs').size()

low.save([path])

low.path = '/some/path/file.json'

autoSave

low.autoSave = true

事件

add(collectionName, insertedDoc)
update(collectionName, updatedDoc, previousDoc)
remove(collectionName, removedDoc)
change()

短语法

low('songs', id)
// == low('songs').get(id).value()
low('songs', {title: 'low!'})
// == low('songs').where({title: 'low!'}).value()
low('songs', {title: 'low!'}, +1)
// == low('songs').insert({title: 'low!'}).value()
low('songs', {title: 'low!'}, -1)
// == low('songs').removeWhere({title: 'low!'}).value()
low('songs', id, -1)
// == low('songs').remove(id).value()
low('songs', id, {title: 'new title'})
// == low('songs').update(id, {title: 'new title'}).value()
low('songs', {published: false}, {published: true})
// == low('songs').updateWhere({published: false}, {published: true}).value()

常见问题

low('posts').insert({ title: 'foo' }) // database is persisted synchronously
low('posts').insert({ title: 'foo' }) // database is not persisted
low('posts').insert({ title: 'foo' }) // database is not persisted
// 100 ms later database will be persisted synchronously

它支持并发吗?