Lowdb json file database, based on lodash method, chained call;
Initialization (in fact, it also distinguishes between client and server usage)
https://github.com/typicode/lowdb/tree/master/examples
const low = requre('lowdb');
const FileSync = require('lowdb/adapters/FileSync')
const adapter = new FileSync('db.json')
const db = low(adapter)
db.defaults({
posts: [], user: {
name:111}, count: 0 })
.write()
- Write & update write()
db.get('posts').push({
id:1,name:'好好学习'}).write()
db.set('user.name', '好好学习').write()
db.update('count', n => n+1).write();
db.get('posts').find({
id:1}).assign({
name:'天天向上'})
- Inquire
db.get('user.name').value();
db.get('posts[0].name').value();
db.get('posts').find({
id:1}).value() //返回对象
db.get('posts').filter({
id:1}).value() //返回数组
db.get('posts').map("name").value()//获取name列表
//排序 sortBy , orderBy
db.get('posts').filter({
name:'xxxx'}).sortBy('id').value();
db.get('posts').filter({
name:'xxxx'}).orderBy('id','desc').value()
//数量
db.get('posts').size().value()
- delete
db.unset('user.name').write()
db.get('posts').remove({
id:1}).write()
//DATA = {users: ["1", "2" "3"]};
db.get('users').pull("3").write()