nodejs渐入佳境[18]-mongodb-node增删查改-创新互联
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| > npm install --save mongodb
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| //mongodb 3以上写法 const MongoClient = require('mongodb').MongoClient;
//TodoApp是一个数据库名字,mongo中不需要创建数据库 MongoClient.connect('mongodb://localhost:27017/TodoApp',(err,client)=>{ if(err){ return console.log('Unable to connect to MongoDB server'); } console.log('Connect to MongoDB server'); const db = client.db('TodoApp');
//插入数据 db.collection('Todos').insertOne({ text:'Something to do', completed:false },(err,result)=>{ if(err){ return console.log('unable to insert todo',err); } console.log(JSON.stringify(result.ops,undefined,2)); }); //关闭客户端 client.close();
});
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id
插入一个对象的时候,会自动的产生一个随机的id。id包含了时间戳和机器识别码。
我们可以借助与mongo的方法,为我们产生一个随机数。
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| const {MongoClient,ObjectID} = require('mongodb'); var obj = new ObjectID(); console.log(obj); //返回时间 console.log(obj.getTimestamp());
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参考资料:
MongoDB Node.js Driver Documentation
node-mongodb-native
查询
原始数据:
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| [ { "_id": "5bee9e3794c5f22eb989f6eb", "text": "Something to do", "completed": false }, { "_id": "5beeaf0a2d48eb2b7c90758f", "text": "Something to do", "completed": true } ]
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js代码:
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| const {MongoClient,ObjectID} = require('mongodb');
MongoClient.connect('mongodb://localhost:27017/TodoApp',(err,client)=>{ if(err){ return console.log('Unable to connect to MongoDB server'); } console.log('Connect to MongoDB server'); const db = client.db('TodoApp');
//返回所有document db.collection('Todos').find().toArray().then((docs)=>{ console.log('Todos'); console.log(JSON.stringify(docs,undefined,2)); },(err)=>{ console.log('unable to fetch todos', err); })
client.close(); });
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执行代码返回:
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| [ { "_id": "5bee9e3794c5f22eb989f6eb", "text": "Something to do", "completed": false }, { "_id": "5beeaf0a2d48eb2b7c90758f", "text": "Something to do", "completed": true } ]
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筛选
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| const {MongoClient,ObjectID} = require('mongodb');
MongoClient.connect('mongodb://localhost:27017/TodoApp',(err,client)=>{ if(err){ return console.log('Unable to connect to MongoDB server'); } console.log('Connect to MongoDB server'); const db = client.db('TodoApp'); db.collection('Todos').find({completed:true}).toArray().then((docs)=>{ console.log('Todos'); console.log(JSON.stringify(docs,undefined,2)); },(err)=>{ console.log('unable to fetch todos', err); })
client.close();
});
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执行代码返回:
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| [ { "_id": "5beeaf0a2d48eb2b7c90758f", "text": "Something to do", "completed": true } ]
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筛选id
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| const {MongoClient,ObjectID} = require('mongodb');
MongoClient.connect('mongodb://localhost:27017/TodoApp',(err,client)=>{ if(err){ return console.log('Unable to connect to MongoDB server'); } console.log('Connect to MongoDB server'); const db = client.db('TodoApp'); db.collection('Todos').find({ new ObjectID('5beeaf0a2d48eb2b7c90758f') }).toArray().then((docs)=>{ console.log('Todos'); console.log(JSON.stringify(docs,undefined,2)); },(err)=>{ console.log('unable to fetch todos', err); })
client.close();
});
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执行代码返回:
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| [ { "_id": "5beeaf0a2d48eb2b7c90758f", "text": "Something to do", "completed": true } ]
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删除document
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| const {MongoClient,ObjectID} = require('mongodb');
MongoClient.connect('mongodb://localhost:27017/TodoApp',(err,client)=>{ if(err){ return console.log('Unable to connect to MongoDB server'); } console.log('Connect to MongoDB server'); const db = client.db('TodoApp'); // db.collection('Todos').deleteMany({text:'mike'}); 删除全部
//删除一个 // db.collection('Todos').deleteOne({text:'mike'}).then((result)=>{ // console.log(result); // });
//删除并返回对象 db.collection('Todos').findOneAndDelete({text:'mike'}).then((result)=>{ console.log(result); });
client.close();
});
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更新
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| const {MongoClient,ObjectID} = require('mongodb');
MongoClient.connect('mongodb://localhost:27017/TodoApp',(err,client)=>{ if(err){ return console.log('Unable to connect to MongoDB server'); } console.log('Connect to MongoDB server'); const db = client.db('TodoApp');
//查找并更新 db.collection('Todos').findOneAndUpdate({text:'mike'},{ $set:{ completed:false //设置更改 } },{ returnOriginal:false //返回的结果为更新后的值。 }).then((result)=>{ console.log(result); //打印跟新结果 });
client.close(); });
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