parse数据库可以破解吗

Parse数据库是商业数据库，具有安全性。因此，Parse数据库不可以被破解，Parse提供的Parse Server和Parse Dashboard也具有相关的安全功能，可以有效地防止数据库被恶意攻击者破解。

作为轻量级的本地存储方式，对于构建不依赖服务器的小型项目，用LowDB存储和管理数据是十分理想的选择。在Nodejs, Electron and browser等一些小型项目中经常能看到LowDB的身影。

https://github.com/typicode/lowdb

npm install lowdb

或者：

yarn add lowdb

const low = require('lowdb')

const FileSync = require('lowdb/adapters/FileSync')// 有多种适配器可选择

const adapter = new FileSync('db.json')// 申明一个适配器

const db = low(adapter)

db.defaults({posts: [], user: {}, count: 0})

.write()

db.get('posts')

.push({id: 1, title: 'lowdb is awesome'})

.write()

db.set('user.name', 'typicode')

.write()

db.update('count', n =>n + 1)

.write()

运行程序会在项目中添加db.json文件，里面存储了添加的数据：

{

"posts": [

{

"id": 1,

"title": "lowdb is awesome"

}

],

"user": {

"name": "typicode"

},

"count": 1

}

lowdb是基于lodash构建的，所以可以使用任何lodash强大的函数，比如: _.get() 和 _.find()，并且可以串联地使用：

db.get('users')

.find({sex: 'male'})

.value()

函数 功能

low(adapter) 返回一个具有特定属性和功能的 lodash chain

db.[...].write() / .value() 写 / 读数据

db.getState() / .setState() 获取 / 设置数据库的状态

db._ 数据库lodash的实例，可以利用这个添加自己的函数或者第三方的mixins,比如lodash-id

db._.mixin({

second: function(array) {

return array[1]

}

})

db.get('posts')

.second()

.value()

针对lowdb自带的适配器：FileSync、FileAsync 和 LocalBrowser，有以下可选参数：

defaultValue: 文件不存在时的默认值；

serialize/deserialize: 写之前和读之后的 *** 作。

const adapter = new FilSync('db.json',{

serialize: (data) =>encrypt(JSON.stringify(data)),

deserialize: (data) =>JSON.parse(decrypt(data))

})

可以直接使用lodash的函数进行查询。需要注意的是有些 *** 作可能会导致原数据被修改，为了避免这种误 *** 作，需要使用 .cloneDeep()， *** 作都是惰性的，只有调用 .value()或 .write()后才会正式执行。

检查users是是否存在

db.has('users')

.value()

设置users

db.set('users', [])

.write()

排序、选择

db.get('users')

.filter({sex: 'male'})

.sortBy('age')

.take(5)

.value()

获取特定字段

db.get('users')

.map('name')

.value()

获取数量

db.get('users')

.size()

.value()

获取特定信息

db.get('users[0].name')

.value()

更新信息

db.get('users')

.find({name: 'Tom'})

.assign({name: 'Tim'})

.write()

删除信息

db.get('users')

.remove({name: 'Time'})

.write()

移除属性

db.unset('users.name)

.write()

深拷贝

db.get('users')

.cloneDeep()

.value()

可以使用 shortid 和 lodash-id 为数据库中的每一条记录创建唯一的id索引，然后通过id检索 *** 作记录：

const shortid = require('shortid')

const postId = db

.get('posts')

.push({ id: shortid.generate(), title: 'low!' })

.write()

.id

const post = db

.get('posts')

.find({ id: postId })

.value()

const lodashId = require('lodash-id')

const FileSync = require('lowdb/adapters/FileSync')

const adapter = new FileSync('db.json')

const db = low(adapter)

db._.mixin(lodashId)

// We need to set some default values, if the collection does not exist yet

// We also can store our collection

const collection = db

.defaults({ posts: [] })

.get('posts')

// Insert a new post...

const newPost = collection

.insert({ title: 'low!' })

.write()

// ...and retrieve it using its id

const post = collection

.getById(newPost.id)

.value()

low( ) 函数接受自定义的Adapter

class MyStorage {

constructor() {

// ...

}

read() {

// Should return data (object or array) or a Promise

}

write(data) {

// Should return nothing or a Promise

}

}

const adapter = new MyStorage(args)

const db = low(adapter)

==============================================

英文官网介绍，更加简洁

Lowdb 3 is a pure ESM package. If you're having trouble importing it in your project, please read this.

You can use TypeScript to type check your data.

You can also add lodash or other utility libraries to improve lowdb.

For CLI, server and browser usage, seeexamples/ directory.

Lowdb has two classes (for asynchronous and synchronous adapters).

Callsadapter.read() and sets db.data .

Note: JSONFile and JSONFileSync adapters will set db.data to null if file doesn't exist.

Callsadapter.write(db.data) .

Holds your db content. If you're using the adapters coming with lowdb, it can be any type supported byJSON.stringify .

For example:

Adapters for reading and writing JSON files.

In-memory adapters. Useful for speeding up unit tests.

Synchronous adapter forwindow.localStorage .

Adapters for reading and writing text. Useful for creating custom adapters.

If you've published an adapter for lowdb, feel free to create a PR to add it here.

You may want to create an adapter to writedb.data to YAML, XML, encrypt data, a remote storage, ...

An adapter is a simple class that just needs to expose two methods:

For example, let's say you have some async storage and want to create an adapter for it:

Seesrc/adapters/ for more examples.

To create an adapter for another format than JSON, you can useTextFile or TextFileSync .

For example:

Lowdb doesn't support Node's cluster module.

If you have large JavaScript objects ( ~10-100MB ) you may hit some performance issues. This is because whenever you call db.write , the whole db.data is serialized using JSON.stringify and written to storage.

Depending on your use case, this can be fine or not. It can be mitigated by doing batch operations and callingdb.write only when you need it.

If you plan to scale, it's highly recommended to use databases like PostgreSQL or MongoDB instead.

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