node.js operation MongoDB instance sharing

This article mainly introduces the relevant information about the detailed examples of node.js operating MongoDB. I hope it can help everyone through instinct and let everyone understand and master this part of the content. Friends in need can refer to it. I hope it can help everyone.

When node.js operates MongoDB, you need to install the mongodb package

1. Use npm to install cnpm

npm install -g cnpm --registry=https://registry.npm.taobao.org

2. Use cnpm to install the mongodb package

cnpm install mongodb

##Four steps when operating MongoDB with node.js Methods: insert data, update data, delete data, search data.

Operation steps

Step 1 Create the executable file xx.js
Step 2 The terminal calls the executable file node xx.js

Note:

You need to start the server before the operation
At the same time, you need to set the operation database and operation collection

1. Insert data

var MongoClient = require('mongodb').MongoClient;
var DB_CONN_STR = 'mongodb://localhost:27017/col';

var writeData = function(db, callback) {
  // 连接到集合
  var collection = db.collection('person');
  // node.js operation MongoDB instance sharing
  var data = [{'name':'20170906','age':'22'}];
  collection.insert(data, function(error, result) {
    if (error) {
      console.log('error:' + error);
      return;
    };

    callback(result);
  });
}

MongoClient.connect(DB_CONN_STR, function(error, db) {
  console.log('连接成功');
  writeData(db, function(result) {
    console.log(result);
    db.close();
  })
})

2. Update data

var MongoClient = require('mongodb').MongoClient;
var DB_CONN_STR = 'mongodb://localhost:27017/col';

var updateData = function(db, callback) {
  // 连接到集合
  var collection = db.collection('person');
  // 修改数据
  var where = {'name':'20170906'};
  var update = {$set:{'age':'33'}};
  collection.update(where, update, function(error, result) {
    if (error) {
      console.log('error:' + error);
      return;
    };

    callback(result);
  });
}

MongoClient.connect(DB_CONN_STR, function(error, db) {
  console.log('连接成功');
  updateData(db, function(result) {
    console.log(result);
    db.close();
  })
})

3. Delete data

var MongoClient = require('mongodb').MongoClient;
var DB_CONN_STR = 'mongodb://localhost:27017/col';

var removeData = function(db, callback) {
  // 连接到集合
  var collection = db.collection('person');
  // node.js operation MongoDB instance sharing
  var where = {'age':'22'};
  collection.remove(where, function(error, result) {
    if (error) {
      console.log('error:' + error);
      return;
    };

    callback(result);
  });
}

MongoClient.connect(DB_CONN_STR, function(error, db) {
  console.log('连接成功');
  removeData(db, function(result) {
    console.log(result);
    db.close();
  })
})

4. Search data

var MongoClient = require('mongodb').MongoClient;
var DB_CONN_STR = 'mongodb://localhost:27017/col';

var readData = function(db, callback) {
  // 连接到集合
  var collection = db.collection('person');
  // 查询数据
  var where = {'name':'20170906'};
  collection.find(where).toArray(function(error, result) {
    if (error) 
    {
      console.log('error:' + error);
      return;
    };

    callback(result);
  });
}

MongoClient.connect(DB_CONN_STR, function(error, db) {
  console.log('连接成功');
  readData(db, function(result) {
    console.log(result);
    db.close();
  })
})

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