更新多个文档

您可以使用.updateMany()集合更新多个文档方法。 updateMany()方法接受过滤文档和更新文档。如果查询与集合中的文档匹配，则该方法会将更新文档中的更新应用于匹配文档的字段和值。更新文档需要更新操作符来修改文档中的字段。

您可以在 updateMany() 方法的第三个参数中传递的 options 对象中指定更多选项。有关更多详细信息，请参阅 updateMany() API 文档。

例子

注意

可以使用此示例连接到 MongoDB 实例，并与包含样本数据的数据库进行交互。如需了解有关连接到 MongoDB 实例和加载样本数据集的更多信息，请参阅使用示例指南。

1 /* Update multiple documents */
2 
3 import { MongoClient } from "mongodb";
4 
5 // Replace the uri string with your MongoDB deployment's connection string
6 const uri = "<connection string uri>";
7 
8 const client = new MongoClient(uri);
9 
10 async function run() {
11   try {
12     // Get the "movies" collection in the "sample_mflix" database
13     const database = client.db("sample_mflix");
14     const movies = database.collection("movies");
15 
16     // Create a filter to update all movies with a 'G' rating
17     const filter = { rated: "G" };
18 
19     // Create an update document specifying the change to make
20     const updateDoc = {
21       $set: {
22         random_review: `After viewing I am ${
23           100 * Math.random()
24         }% more satisfied with life.`,
25       },
26     };
27     // Update the documents that match the specified filter
28     const result = await movies.updateMany(filter, updateDoc);
29     console.log(`Updated ${result.modifiedCount} documents`);
30   } finally {
31     // Close the database connection on completion or error
32     await client.close();
33   }
34 }
35 run().catch(console.dir);

1 /* Update multiple documents */
2 
3 import { MongoClient } from "mongodb";
4 
5 // Replace the uri string with your MongoDB deployment's connection string.
6 const uri = "<connection string uri>";
7 
8 const client = new MongoClient(uri);
9 
10 enum Rating {
11   G = "G",
12   PG = "PG",
13   PG_13 = "PG-13",
14   R = "R",
15   NR = "NOT RATED",
16 }
17 
18 // Create a Movie interface
19 interface Movie {
20   rated: Rating;
21   random_review?: string;
22 }
23 
24 async function run() {
25   try {
26     // Get the "movies" collection in the "sample_mflix" database
27     const database = client.db("sample_mflix");
28     const movies = database.collection<Movie>("movies");
29 
30     // Update all documents that match the specified filter
31     const result = await movies.updateMany(
32       { rated: Rating.G },
33       {
34         $set: {
35           random_review: `After viewing I am ${
36             100 * Math.random()
37           }% more satisfied with life.`,
38         },
39       }
40     );
41     console.log(`Updated ${result.modifiedCount} documents`);
42   } finally {
43     // Close the database connection on completion or error
44     await client.close();
45   }
46 }
47 run().catch(console.dir);

运行前面的示例，您将看到以下输出：

Updated 477 documents

后退

更新文档

来年

替换文档

1	/* Update multiple documents */
2
3	import { MongoClient } from "mongodb";
4
5	// Replace the uri string with your MongoDB deployment's connection string
6	const uri = "<connection string uri>";
7
8	const client = new MongoClient(uri);
9
10	async function run() {
11	try {
12	// Get the "movies" collection in the "sample_mflix" database
13	const database = client.db("sample_mflix");
14	const movies = database.collection("movies");
15
16	// Create a filter to update all movies with a 'G' rating
17	const filter = { rated: "G" };
18
19	// Create an update document specifying the change to make
20	const updateDoc = {
21	$set: {
22	random_review: `After viewing I am ${
23	100 * Math.random()
24	}% more satisfied with life.`,
25	},
26	};
27	// Update the documents that match the specified filter
28	const result = await movies.updateMany(filter, updateDoc);
29	console.log(`Updated ${result.modifiedCount} documents`);
30	} finally {
31	// Close the database connection on completion or error
32	await client.close();
33	}
34	}
35	run().catch(console.dir);