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【2015新书】JavaScript JSON Cookbook   [推广有奖]

61楼
Reader's 发表于 2017-7-23 00:54:13
  1. Searching for a document in MongoDB with Node.js

  3. Being able to insert documents wouldn't do you much good if you didn't have a way to search for documents. MongoDB lets you specify a template on which to match, and returns objects matching that template.

  5. As with insertions and updates, you'll work with a collection of documents, invoking the collection's find method.

  7. How to do it...

  9. Here's an example that finds all documents in the test collection with a call of kf6gpe-7 and prints them to the console:

  11. var mongo = require('mongodb').MongoClient;

  13. var url = 'mongodb://localhost:27017/test';

  15. mongo.connect(url, function(error, db) {
  16.   console.log("mongo.connect returned " + error);

  18.   var cursor = collection.find({call: 'kf6gpe-7'});
  19.   cursor.toArray(function(error, documents) {
  20.     console.log(documents);

  22.     db.close();
  23.   });
  24. });
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62楼
Reader's 发表于 2017-7-23 00:54:47
  1. Updating a document in MongoDB with Node.js

  3. Updating a document in a collection is easy; simply use the collection's update method and pass the data you want to update.

  5. How to do it...

  7. Here's a simple example:

  9. var mongo = require('mongodb').MongoClient;

  11. var url = 'mongodb://localhost:27017/test';

  13. var update = function(collection, callback) {
  14.   collection.update({ call:'kf6gpe-7' },
  15.     { $set: { lat: 39.0, lng: -121.0, another: true } },
  16.     function(error, result) {
  17.       console.log('Updated with error ' + error);
  18.       console.log(result);
  19.       callback(result);
  20.     });
  21. };

  23. mongo.connect(url, function(error, db) {
  24.   console.log("mongo.connect returned " + error);

  26.   // Get the documents collection
  27.   var collection = db.collection('documents');
  28.   update(collection, function(result) {
  29.     db.close();
  30.   });
  31. });
  32. The pattern of this is identical to the insert method; update is an asynchronous method that invokes a callback with an error code and a result.
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63楼
钱学森64 发表于 2019-3-7 17:05:33
谢谢分享
64楼
wangyong8935 在职认证  发表于 2019-10-18 13:58:19
thank you for sharing
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