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weapp-simple-storage

v1.0.1

Published

微信小程序的简单存储, 支持 TTL(time-to-live) 缓存自动过期

Downloads

3

Readme

weapp-simple-storage

NPM version changelog license

微信小程序的简单缓存存储, 支持 TTL(time-to-live) 缓存自动过期

Installation

npm install weapp-simple-storage --save

Example usage

import SimpleStorage from 'weapp-simple-storage';
 
var simpleStorage = new SimpleStorage({
    name: '_weapp_simple_storage'
});

simpleStorage.set('key', {
    foo: 'bar'
}, {
    ttl: 60000
});
simpleStorage.get('key');
simpleStorage.has('key');
simpleStorage.delete('key');
simpleStorage.clear();

数据结构

  • 所有的缓存数据都存储在微信小程序缓存存储的一个 key 上面

  • 缓存的数据与元数据分开存储, 类似数据库表的设计思路: 主表 + 扩展表

    • 缓存的数据可以看做是主表数据
    • 缓存的元数据可以看做是多张扩展表(关联表)数据(以 key 为外链)
    • 多张扩展表便于隔离数据和扩展

    缓存数据(主表)

    | key(PK) | value | |-----------|------------------| | key1 | value1 | | key2 | value2 |

    元数据1(扩展表1)

    | key(FK) | value | |-----------|------------------| | key1 | meta1-value1 | | key2 | meta1-value2 |

    元数据2(扩展表2)

    | key(FK) | value | |-----------|------------------| | key1 | meta2-value1 | | key2 | meta2-value2 |

{
    "name": {             // new SimpleStorage({ name: 'name' });
        "key1": "value1"  // simpleStorage.set('key1', 'value1');
        "key2": "value2"  // simpleStorage.set('key2', 'value2');
        "_meta_name": {
            "meta1": {
                "key1": "meta1-value1" // simpleStorage.setMeta('meta1', 'key1', 'meta1-value1');
                "key2": "meta1-value2" // simpleStorage.setMeta('meta1', 'key2', 'meta1-value2');
            },
            "meta2": {
                "key1": "meta2-value1" // simpleStorage.setMeta('meta2', 'key1', 'meta2-value1');
                "key2": "meta2-value2" // simpleStorage.setMeta('meta2', 'key2', 'meta2-value2');
            }
        }
    }
}

实际的缓存数据示例

数据结构示例

options

options.name

存储所有缓存数据的 key 值的名称

options.loggerLevel

日志级别, 默认为 WARN 级别, 具体级别请查看 simple-console-log-level

API

set(key: string, value: any, options: object)

设置某个缓存

get(key: string): any

获取某个缓存

has(key: string): boolean

是否存在某个缓存

delete(key: string): boolean

删除某个缓存

clear()

清除所有缓存

keys(): Array

获取缓存中的所有 key 值

setMeta(name: string, key: string, value: any): boolean

设置元数据

getMeta(name: string, key: string): any

获取元数据

hasMeta(name: string): boolean

是否有元数据

setTtl(key: string, ttl: number) 由 TtlPlugin 提供

设置缓存的存活时长(ms)

getTtl(key: string): number 由 TtlPlugin 提供

获取缓存的存活时间(ms)

installPlugin(Plugin: Plugin, pluginOptions: object)

安装插件: SimpleStorage.installPlugin(Plugin);

Plugin

  • Plugin 缓存的插件机制
  • TtlPlugin TTL 缓存机制的插件(内置)
  • DumpPlugin 获取缓存数据的所有内容(包括元数据)
  • TimePlugin 记录缓存数据的新增和更新时间

Thanks