Mongoose中文網(wǎng)

1、需求分析

Mongoose是什么?

Mongoose優(yōu)勢(shì)！

2、基本操作

//1.鏈接數(shù)據(jù)庫(kù)

let mongoose = require("mongoose");
mongoose.connect("mongodb://localhost/m_data");
mongoose.connection.once("open", () => {
    console.log('數(shù)據(jù)庫(kù)鏈接成功')
})

//2.創(chuàng)建Schema（模型對(duì)象）
let Schema = mongoose.Schema;
let personSchema = new Schema({
    name: String,
    age: Number,
    sex: {
        type: String,
        default: "男"
    },
    chat: String
});

//3.創(chuàng)建Model對(duì)象

let personModel = mongoose.model("person",personSchema);

3. 增刪改查

增

// 3.1 增加
personModel.create([
    {name: "馬紅燈", age: 19, chat: "紅燈1992"},
    {name: "龔志敏", age: 42, chat: "龔1992"},
    {name: "李發(fā)華", age: 32, chat: "發(fā)華1992"},
    {name: "李建華", age: 22, chat: "建華1992"},
    {name: "依依", age: 22, chat: "依依1992", sex: "女"},
], (err) => {
    if(!err) {
        console.log('插入成功')
    } else {
        throw err;
    }
})

查

// 3.2 查詢(xún)
personModel.find({name: "錢(qián)森"},(err, docs) => {
    if(!err) {
        console.log(docs)
        console.log(typeof docs)
    } else {
         throw err
     }
})

personModel.find({},{name: 1,_id:0},(err, docs) => {  //定義查詢(xún)結(jié)果顯示字段
    if(!err) {
        console.log(docs)
        console.log(typeof docs)
    } else {
        throw err
    }
})

/* skip:2 開(kāi)始位置  limit:2 取出信息條數(shù)*/
personModel.find({}, "-_id name sex chat", {skip:2, limit:2}, (err, docs) => {  //定義查詢(xún)結(jié)果顯示字段
    if(!err) {
        console.log(docs)
        console.log(typeof docs)
    } else {
        throw err
    }
})

改

// 4.3修改

personModel.update({name:"錢(qián)森"}, {$set: {age:96}},{multi: true}, (err) => {
    if (!err) {
        console.log("修改成功??！")
    } else {
        throw err
    }
});

刪

// 4.4刪除
    /* 
        Model.deleteMany()
        Model.deleteOne()
        Model.remove()
    */

personModel.remove({name: "錢(qián)森"}, (err) => {  //刪除所有匹配
    if (!err) {
        console.log("刪除成功！！")
    } else {
        throw err
    }
})

統(tǒng)計(jì)

//4.5統(tǒng)計(jì)文檔的個(gè)數(shù)
/* 
    Model.count()
*/
personModel.count({}, (err) => {
    if (!err) {
        console.log(count)
    } else {
        throw err
    }
})