How to Use MongoDB with Deno

How to Use MongoDB with Deno

1) Visit ‘Third Party Modules’ page of ‘Done’ Website (https://deno.land/x).

2) Enter ‘mongo’ on the ‘Search Input Box’ and press ‘Enter’. 3) Click ‘mongo’ link.

3) Run ‘deno command’ when you want to ren deno_mongo.

deno run --allow-net --allow-write --allow-read --allow-plugin --unstable xxx.ts

4) Examples of codes

• ##Import## Mongo module.

  import { MongoClient } from "https://deno.land/x/mongo@v0.8.0/mod.ts";
  

• Connection

  const client = new MongoClient();
  client.connectionWithUri("mongodb://localhost:27017");
  

• Defining schema interface

  interface UserSchema {
    _id: { $oid: string };
    username: string;
    password: string;
  };
  

• DB & Schema

  const db = client.database("test");
  const users = db.collection<UserSchema>("users");
  

• insert

  const insertId = await users.insertOne({
    username: "user1",
    password: "pass1",
  });
  

• insertMany

  const insertIds = await users.insertMany([
    {
        username: "user1",
        password: "pass1",
    },
    {
        username: "user2",
        password: "pass2",
    },
  ]);
  

• findOne

  const user1 = await users.findOne({ _id: insertId });
  // Returns:
  // { _id: { $oid: "<oid>" }, username: "user1", password: "pass1" }
  

• find

  const all_users = await users.find({ username: { $ne: null }});
  

• find by ObjectId

  const user1_id = await users.findOne(
    { _id: { "$oid": "<oid>" }},
  );
  

• count

  const count = await users.count({ username: { $ne: null } });
  

• aggregation

  const docs = await users.aggregate([
    { $match: { username: "many" } },
    { $group: { _id: "$username", total: { $sum: 1 } } },
  ]);
  

• updateOne

  const { matchedCount, modifiedCount, upsertedId } = await users.updateOne(
    { username: { $ne: null } },
    { $set: { username: "USERNAME" } },
  );
  

• updateMany

  const { matchedCount, modifiedCount, upsertedId } = await users.updateMany(
    { username: { $ne: null } },
    { $set: { username: "USERNAME" } },
  );
  

• deleteOne

  const deleteCount = await users.deleteOne({ _id: insertId });
  

• deleteMany

  const deleteCount2 = await users.deleteMany({ username: "test" });
  

References

---

Deno. deno_mongo. Retrieved July 8, 2020, from https://deno.land/x/mongo —