node.js operation MongoDB instance sharing-JS Tutorial-php.cn

node.js operation MongoDB instance sharing

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Release： 2018-01-25 10:52:44

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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

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2. Use cnpm to install the mongodb package

cnpm install mongodb

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node.js operation MongoDB instance sharing

##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

node.js operation MongoDB instance sharing

1. Insert data

var MongoClient = require(&#39;mongodb&#39;).MongoClient;
var DB_CONN_STR = &#39;mongodb://localhost:27017/col&#39;;

var writeData = function(db, callback) {
  // 连接到集合
  var collection = db.collection(&#39;person&#39;);
  // node.js operation MongoDB instance sharing
  var data = [{&#39;name&#39;:&#39;20170906&#39;,&#39;age&#39;:&#39;22&#39;}];
  collection.insert(data, function(error, result) {
    if (error) {
      console.log(&#39;error:&#39; + error);
      return;
    };

    callback(result);
  });
}

MongoClient.connect(DB_CONN_STR, function(error, db) {
  console.log(&#39;连接成功&#39;);
  writeData(db, function(result) {
    console.log(result);
    db.close();
  })
})

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2. Update data

var MongoClient = require(&#39;mongodb&#39;).MongoClient;
var DB_CONN_STR = &#39;mongodb://localhost:27017/col&#39;;

var updateData = function(db, callback) {
  // 连接到集合
  var collection = db.collection(&#39;person&#39;);
  // 修改数据
  var where = {&#39;name&#39;:&#39;20170906&#39;};
  var update = {$set:{&#39;age&#39;:&#39;33&#39;}};
  collection.update(where, update, function(error, result) {
    if (error) {
      console.log(&#39;error:&#39; + error);
      return;
    };

    callback(result);
  });
}

MongoClient.connect(DB_CONN_STR, function(error, db) {
  console.log(&#39;连接成功&#39;);
  updateData(db, function(result) {
    console.log(result);
    db.close();
  })
})

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3. Delete data

var MongoClient = require(&#39;mongodb&#39;).MongoClient;
var DB_CONN_STR = &#39;mongodb://localhost:27017/col&#39;;

var removeData = function(db, callback) {
  // 连接到集合
  var collection = db.collection(&#39;person&#39;);
  // node.js operation MongoDB instance sharing
  var where = {&#39;age&#39;:&#39;22&#39;};
  collection.remove(where, function(error, result) {
    if (error) {
      console.log(&#39;error:&#39; + error);
      return;
    };

    callback(result);
  });
}

MongoClient.connect(DB_CONN_STR, function(error, db) {
  console.log(&#39;连接成功&#39;);
  removeData(db, function(result) {
    console.log(result);
    db.close();
  })
})

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4. Search data

var MongoClient = require(&#39;mongodb&#39;).MongoClient;
var DB_CONN_STR = &#39;mongodb://localhost:27017/col&#39;;

var readData = function(db, callback) {
  // 连接到集合
  var collection = db.collection(&#39;person&#39;);
  // 查询数据
  var where = {&#39;name&#39;:&#39;20170906&#39;};
  collection.find(where).toArray(function(error, result) {
    if (error) 
    {
      console.log(&#39;error:&#39; + error);
      return;
    };

    callback(result);
  });
}

MongoClient.connect(DB_CONN_STR, function(error, db) {
  console.log(&#39;连接成功&#39;);
  readData(db, function(result) {
    console.log(result);
    db.close();
  })
})

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Completely master the add, delete, modify and query functions of nodejs to operate mongodb

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