Modify Documents修改文档

// Update a document更新文档

import { MongoClient } from "mongodb";

// Replace the uri string with your MongoDB deployment's connection string将uri字符串替换为MongoDB部署的连接字符串
const uri = "<connection string uri>";

const client = new MongoClient(uri);

async function run() {
  try {
    const database = client.db("sample_mflix");
    const movies = database.collection("movies");

    // Create a filter for movies with the title "Random Harvest"为标题为“随机收获”的电影创建筛选器
    const filter = { title: "Random Harvest" };

    /* Set the upsert option to insert a document if no documents match the filter设置upsert选项，以便在没有符合筛选条件的文档时插入文档 */
    const options = { upsert: true };

    // Specify the update to set a value for the plot field指定更新以设置绘图字段的值
    const updateDoc = {
      $set: {
        plot: `A harvest of random numbers, such as: ${Math.random()}`
      },
    };

    // Update the first document that matches the filter更新与筛选器匹配的第一个文档
    const result = await movies.updateOne(filter, updateDoc, options);
    
    // Print the number of matching and modified documents打印匹配和修改的文档数量
    console.log(
      `${result.matchedCount} document(s) matched the filter, updated ${result.modifiedCount} document(s)`,
    );
  } finally {
    // Close the connection after the operation completes操作完成后关闭连接
    await client.close();
  }
}
// Run the program and print any thrown errors运行程序并打印任何抛出的错误
run().catch(console.dir);

// Update a document更新文档

import { MongoClient } from "mongodb";

// Replace the uri string with your MongoDB deployment's connection string将uri字符串替换为MongoDB部署的连接字符串
const uri = "<connection string uri>";

const client = new MongoClient(uri);

// Define the Movie interface定义电影界面
interface Movie {
  plot: string;
  title: string;
}

async function run() {
  try {
    const database = client.db("sample_mflix");
    const movies = database.collection<Movie>("movies");

    /* Update a document that has the title "Random Harvest" to have a plot field with the specified value将标题为“随机收获”的文档更新为具有指定值的绘图字段 */
    const result = await movies.updateOne(
      { title: "Random Harvest" },
      {
        $set: {
          plot: `A harvest of random numbers, such as: ${Math.random()}`,
        },
      },
      /* Set the upsert option to insert a document if no documents match the filter设置upsert选项，以便在没有符合筛选条件的文档时插入文档 */
      { upsert: true }
    );

    // Print the number of matching and modified documents打印匹配和修改的文档数量
    console.log(
      `${result.matchedCount} document(s) matched the filter, updated ${result.modifiedCount} document(s)`
    );
  } finally {
    // Close the connection after the operation completes操作完成后关闭连接
    await client.close();
  }
}
// Run the program and print any thrown errors运行程序并打印任何抛出的错误
run().catch(console.dir);

/* Update multiple documents更新多个文档 */

import { MongoClient } from "mongodb";

// Replace the uri string with your MongoDB deployment's connection string将uri字符串替换为MongoDB部署的连接字符串
const uri = "<connection string uri>";

const client = new MongoClient(uri);

async function run() {
  try {
    // Get the "movies" collection in the "sample_mflix" database在“sample_mflix”数据库中获取“电影”集合
    const database = client.db("sample_mflix");
    const movies = database.collection("movies");

    // Create a filter to update all movies with a 'G' rating创建一个筛选器来更新所有评级为“G”的电影
    const filter = { rated: "G" };

    // Create an update document specifying the change to make创建一个更新文档，指定要进行的更改
    const updateDoc = {
      $set: {
        random_review: `After viewing I am ${
          100 * Math.random()
        }% more satisfied with life.`,
      },
    };
    // Update the documents that match the specified filter更新与指定筛选器匹配的文档
    const result = await movies.updateMany(filter, updateDoc);
    console.log(`Updated ${result.modifiedCount} documents`);
  } finally {
    // Close the database connection on completion or error完成或出错时关闭数据库连接
    await client.close();
  }
}
run().catch(console.dir);

/* Update multiple documents更新多个文档 */

import { MongoClient } from "mongodb";

// Replace the uri string with your MongoDB deployment's connection string.将uri字符串替换为MongoDB部署的连接字符串。
const uri = "<connection string uri>";

const client = new MongoClient(uri);

enum Rating {
  G = "G",
  PG = "PG",
  PG_13 = "PG-13",
  R = "R",
  NR = "NOT RATED",
}

// Create a Movie interface创建电影界面
interface Movie {
  rated: Rating;
  random_review?: string;
}

async function run() {
  try {
    // Get the "movies" collection in the "sample_mflix" database在“sample_mflix”数据库中获取“电影”集合
    const database = client.db("sample_mflix");
    const movies = database.collection<Movie>("movies");

    // Update all documents that match the specified filter更新与指定筛选器匹配的所有文档
    const result = await movies.updateMany(
      { rated: Rating.G },
      {
        $set: {
          random_review: `After viewing I am ${
            100 * Math.random()
          }% more satisfied with life.`,
        },
      }
    );
    console.log(`Updated ${result.modifiedCount} documents`);
  } finally {
    // Close the database connection on completion or error完成或出错时关闭数据库连接
    await client.close();
  }
}
run().catch(console.dir);