mongoose

连接 mongo

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/*
* @ use 数据库连接
*/
const mongoose = require("mongoose");
const config = require("../../config/common");

const dbConfig = config[process.env.NODE_ENV || "development"];

mongoose.connect(dbConfig.mongo.url, { useNewUrlParser: true });

mongoose.set("useCreateIndex", true); //加上这个

// 连接成功
mongoose.connection.on("connected", function () {
//console.log('连接成功 ' + dbConfig.mongo.url);
});

// 连接失败
mongoose.connection.on("error", function (err) {
console.log("连接失败 " + err);
});

// 断开连接
mongoose.connection.on("disconnected", function () {
console.log("断开连接");
});

定义 Schema

#Schema.Type

  • String
  • Number
  • Date
  • Buffer
  • Boolean
  • Mixed
  • Objectid
  • Array
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var mongoose = require('mongoose');
var Schema = mongoose.Schema;

var UserSchema = new Schema({
name : { type: String, unique: true },
posts : [{ type: Schema.Types.ObjectId, ref: 'Post' }]
});
var User = mongoose.model('User', UserSchema);

var PostSchema = new Schema({
poster : { type: Schema.Types.ObjectId, ref: 'User' },
comments : [{ type: Schema.Types.ObjectId, ref: 'Comment' }],
title : String,
content : String
});
var Post = mongoose.model('Post', PostSchema);

var CommentSchema = new Schema({
post : { type: Schema.Types.ObjectId, ref: "Post" },
commenter : { type: Schema.Types.ObjectId, ref: 'User' },
content : {
main: String,
label: String
},
points: [
point: [{type: Schema.Types.ObjectId, ref: 'Point'}]
]
});
var Comment = mongoose.model('Comment', CommentSchema);

var PointSchema = new mongoose.Schema({
name: String,
parent: {type: Schema.Types.ObjectId, ref: 'point'},
children: [{type: Schema.Types.ObjectId, ref: 'point'}]
})
var Point = mongoose.model('Point', PointSchema);

查询条件

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$or    或关系
$nor    或关系取反
$gt    大于
$gte    大于等于
$lt     小于
$lte    小于等于
$ne 不等于
$in 在多个值范围内
$nin 不在多个值范围内
$all 匹配数组中多个值
$regex  正则,用于模糊查询
$size   匹配数组大小
$maxDistance  范围查询,距离(基于LBS
$mod   取模运算
$near   邻域查询,查询附近的位置(基于LBS
$exists   字段是否存在
$elemMatch  匹配内数组内的元素
$within  范围查询(基于LBS
$box    范围查询,矩形范围(基于LBS
$center 范围醒询,圆形范围(基于LBS
$centerSphere  范围查询,球形范围(基于LBS
$slice    查询字段集合中的元素(比如从第几个之后,第N到第M个元素)

mongodb 对数组中的所有元素进行一次性修改方法

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{
name: 4,
list: [{
id: "a",
date: 1504195200000,
other: "c"
},{
id: "b",
date: 1504195200000,
other: "c"
}]
}
// 现在要把other全部更新为"a",方法如下
db.getCollection('test')
.update({'name': 4}, {$set: {'list.$[].other': 'a'}}, {multi: true})