数据库操作 ODM mongoose-KeepStudy

数据库操作 ODM mongoose

### 安装
```js
npm install mongoose
```

### 导入
```js
// Using Node.js `require()`
const mongoose = require('mongoose');

// Using ES6 imports
import mongoose from 'mongoose';

//Or, using Deno's createRequire() for CommonJS support as follows.
import { createRequire } from 'https://deno.land/std@0.177.0/node/module.ts';
const require = createRequire(import.meta.url);
const mongoose = require('mongoose');
```

### 连接到 MongoDB
```js
// 导入 mongoose 模块
const mongoose = require("mongoose");

// 设置默认 mongoose 连接
const mongoDB = "mongodb://127.0.0.1/my_database";
mongoose.connect(mongoDB);

// 让 mongoose 使用全局 Promise 库
mongoose.Promise = global.Promise;

// 取得默认连接
const db = mongoose.connection;

// 将连接与错误事件绑定（以获得连接错误的提示）
db.on("error", console.error.bind(console, "MongoDB 连接错误："));

//导出
module.exports = mongoose;
```

### 创建模型
```js
// 定义一个模式
const Schema = mongoose.Schema;

const SomeModelSchema = new Schema({
  a_string: String,
  a_date: Date,
});

// 使用模式“编译”模型
const SomeModel = mongoose.model("SomeModel", SomeModelSchema);
```

### 模式类型（字段）
```typescript
const schema = new Schema({
  name: String,
  binary: Buffer,
  living: Boolean,
  updated: { type: Date, default: Date.now },
  age: { type: Number, min: 18, max: 65, required: true },
  mixed: Schema.Types.Mixed,
  _someId: Schema.Types.ObjectId,
  array: [],
  ofString: [String], // 其他类型也可使用数组
  nested: { stuff: { type: String, lowercase: true, trim: true } },
  title: { type: String, default: 'hahaha' },
  age: { type: Number, min: 18, index: true },
  bio: { type: String, match: /[a-z]/ },
  date: { type: Date, default: Date.now },
  buff: Buffer,
  author: {type: Schema.Types.ObjectId, ref: "Author", require: true}, //一个关联
  genre: [{type: Schema.Types.ObjectId, ref: "Genre"}],//多个关联
  asset: {
    name: String,
    type: { type: String } // works. asset is an object with a type property
  }
});
```

顶部

Node.js：ExpressWeb

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