服务器环境的本地数据库

const fs=require('fs-extra');
const ShortName=require('./ShortName');
const WashRoom=require('./WashRoom')
//本地数据库
class LocalStorage{
    constructor(tagDir) {
        this.dbDir=tagDir||__dirname+'/db/';
        fs.ensureDirSync(this.dbDir);
        this.shortName=new ShortName({
            tagDir:this.dbDir+'shortName/',
        })
    }
    async setItem(name,item){
        const id=await this.shortName.saveId(name);
        const wash=new WashRoom(id);
        await wash.wait();
        fs.writeFileSync(this.dbDir+id,item);
        wash.end();
    }
    async setData (name, data) {
        const item = typeof data === 'object' ? JSON.stringify(data) : data;
        await this.setItem(name,item);
    }
    async getData (name) {
        if (await this.hasData(name)) {
            const id=await this.shortName.getId(name);
            const item=fs.readFileSync(this.dbDir+id).toString()
            try {
                return JSON.parse(item);
            } catch (e) {
                // ..
            }
            return item;
        }
    }
    async hasData (name) {
        const id=await this.shortName.getId(name);
        if(id!==-1&&fs.existsSync(this.dbDir+id)){
            return true
        }
        return false;
    }
    async removeData (name) {
        const id=await this.shortName.getId(name);
        fs.unlinkSync(this.dbDir+id);
    }
    clearData () {
        fs.emptyDirSync(this.dbDir);
        fs.ensureDirSync(this.dbDir+'shortName/');
    }

}
module.exports=LocalStorage;

 

const LocalStorage = require('./utils/LocalStorage');
const localStorage=new LocalStorage(__dirname+'/localDb/');
localStorage.setData('首页',{
    'logo':'png1',
    '标题':'我是淀粉酶'
})

localStorage.getData('首页').then(function (d) {
    console.log(d)
})