2025-02-09 21:02:47 +08:00

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---
description: 缓存(Cache)
globs:
---
# 缓存
为了方便开发者进行缓存操作的组件,它有利于改善项目的性能。它为我们提供了一个数据中心以便进行高效的数据访问。
:::
## 使用
```ts
import { InjectClient, Provide } from '@midwayjs/core';
import { CachingFactory, MidwayCache } from '@midwayjs/cache-manager';
@Provide()
export class UserService {
@InjectClient(CachingFactory, 'default')
cache: MidwayCache;
async invoke(name: string, value: string) {
// 设置缓存
await this.cache.set(name, value);
// 获取缓存
const data = await this.cache.get(name);
// ...
}
}
```
## 换成 Redis (v7.1 版本)
安装依赖,具体可以查看@midwayjs cache
```bash
pnpm i cache-manager-ioredis-yet --save
```
`src/config/config.default.ts`
```ts
import { CoolFileConfig, MODETYPE } from "@cool-midway/file";
import { MidwayConfig } from "@midwayjs/core";
// redis缓存
import { redisStore } from "cache-manager-ioredis-yet";
export default {
// Redis缓存
cacheManager: {
clients: {
default: {
store: redisStore,
options: {
port: 6379,
host: "127.0.0.1",
password: "",
ttl: 0,
db: 0,
},
},
},
},
} as unknown as MidwayConfig;
```
## 换成 Redis (以往版本)
```bash
pnpm i cache-manager-ioredis --save
```
`src/config/config.default.ts`
```ts
import { CoolFileConfig, MODETYPE } from "@cool-midway/file";
import { MidwayConfig } from "@midwayjs/core";
// redis缓存
import * as redisStore from "cache-manager-ioredis";
export default {
// Redis缓存
cache: {
store: redisStore,
options: {
port: 6379,
host: "127.0.0.1",
password: "",
db: 0,
keyPrefix: "cool:",
ttl: null,
},
},
} as unknown as MidwayConfig;
```
## 使用
`src/modules/demo/controller/open/cache.ts`
```ts
import { DemoCacheService } from "../../service/cache";
import { Inject, Post, Provide, Get, InjectClient } from "@midwayjs/core";
import { CoolController, BaseController } from "@cool-midway/core";
import { CachingFactory, MidwayCache } from "@midwayjs/cache-manager";
/**
* 缓存
*/
@Provide()
@CoolController()
export class AppDemoCacheController extends BaseController {
@InjectClient(CachingFactory, "default")
midwayCache: MidwayCache;
@Inject()
demoCacheService: DemoCacheService;
/**
* 设置缓存
* @returns
*/
@Post("/set")
async set() {
await this.midwayCache.set("a", 1);
// 缓存10秒
await this.midwayCache.set("a", 1, 10 * 1000);
return this.ok(await this.midwayCache.get("a"));
}
/**
* 获得缓存
* @returns
*/
@Get("/get")
async get() {
return this.ok(await this.demoCacheService.get());
}
}
```
## 方法缓存
有些业务场景,我们并不希望每次请求接口都需要操作数据库,如:今日推荐、上个月排行榜等,数据存储在 redis
框架提供了 `@CoolCache` 方法装饰器,方法设置缓存,让代码更优雅
`src/modules/demo/service/cache.ts`
```ts
import { Provide } from "@midwayjs/core";
import { CoolCache } from "@cool-midway/core";
/**
* 缓存
*/
@Provide()
export class DemoCacheService {
// 数据缓存5秒
@CoolCache(5000)
async get() {
console.log("执行方法");
return {
a: 1,
b: 2,
};
}
}
```
::: warning
service 主要是处理业务逻辑,`@CoolCache`应该要在 service 中使用,不要在 controller 等其他位置使用
:::