{id}`); }); // 查询集合中的所有文档 const query = {}; // 空查询对象表示查询所有文档 const options = { projection: { _id: 0, name: 1, age: 1, address: 1 } }; // 仅选择需要的字段 const cursor = collection.find(query, options); // 打印查询到的所有文档 const allValues = ...
})//联合使用,类似 SQL : 'where key1>value1 and (key2 = value2 or key3 = value3)'db.col.find({key1: {$gt:value1}, $or: [{key2: value2},{key3: value3}]}) //存在 age 字段(false 不存在)db.col.find({age:{$exists:true}});//查询 null 值;会查询出 age 为 null 和不...
('mongodb://localhost:27017/your_database_name',{useNewUrlParser:true,useUnifiedTopology:true});constSchema=mongoose.Schema;// 定义一个简单的模型constMyModel=mongoose.model('MyModel',newSchema({key:String}));// 动态查找条件constquery={key:"value"};MyModel.find(query).exec((err,result)=...
runoob0.000GB# 创建了 runoob 数据库>userunoob# 切换到 runoob 数据库runoob>show tables exampleCollection# 创建了 exampleCollection 集合(数据表)# 自动创建了 site 集合(数据表)runoob>db.exampleCollection.find()[{_id:ObjectId('6678e1d1f9503dc2e0e2a20b'),name:'Alice',age:25,address:'Wonderland'...
find(query); let result=[]; await cursor.forEach(data=>{ result.push(data); }); console.log(result); }finally{ await client.close(); } } run().catch(console.dir); 更多 2.5、删除数据 示例代码: 代码语言:javascript 代码运行次数:0 运行 AI代码解释 const { MongoClient } = require("...
The first parameter of thefindOne()method is a query object. In this example we use an empty query object, which selects all documents in a collection (but returns only the first document). ExampleGet your own Node.js Server Find the first document in the customers collection: ...
find(query).toArray(function(err, result) { if (err) throw err; console.log(result); db.close(); });}); Run example » Save the code above in a file called "demo_mongodb_query_s.js" and run the file:Run "demo_mongodb_query_s.js" C:\Users\Your Name>node demo_mongodb_...
nodejs MongoDB模糊查询 在开发Web应用程序时,经常会遇到需要根据用户输入的关键词进行模糊查询的情况。MongoDB是一种非常流行的NoSQL数据库,在Node.js应用中使用MongoDB进行模糊查询是一种常见的操作。 什么是模糊查询 模糊查询是指在数据库中根据关键词搜索数据时,不仅能匹配上完全相同的数据,还可以匹配上相似的...
Get your ideas to market faster with a flexible, AI-ready database. MongoDB makes working with data easy.
MongoDB and Node.js 3.3.2 Tutorial - CRUD Operations Learn how to execute the CRUD (create, read, update, and delete) operations in MongoDB using Node.js in this step-by-step tutorial. JavaScriptMongoDBNode.js Oct 01, 2024 Lauren Schaefer ...