ADS_6_CRUD_mongo

EXP 6:

MONGODB CRUD

open cmd type mongosh // if not shows then no mongo is present
use db;

//Create collection
db.createCollection("emp");
// 1. Create (Insert)

// Insert One Document
db.collectionName.insertOne({
    key1: "value1",
    key2: "value2"
});

// Insert Multiple Documents
db.collectionName.insertMany([
    { key1: "value1", key2: "value2" },
    { key1: "value3", key2: "value4" }
]);

// 2. Read (Find)

// Find One Document
db.collectionName.findOne({ key: "value" });

// Find All Documents
db.collectionName.find({});

// Find with Query
db.collectionName.find({ key: "value" });

// Find with Projection
db.collectionName.find({ key: "value" }, { key1: 1, key2: 1 });

// Find with Sorting
db.collectionName.find({}).sort({ key: 1 });

// Find with Limiting Results
db.collectionName.find({}).limit(5);

// 3. Update

// Update One Document
db.collectionName.updateOne(
    { filterKey: "value" },
    { $set: { keyToUpdate: "newValue" } }
);

// Update Multiple Documents
db.collectionName.updateMany(
    { filterKey: "value" },
    { $set: { keyToUpdate: "newValue" } }
);

// Replace One Document
db.collectionName.replaceOne(
    { filterKey: "value" },
    { newKey1: "newValue1", newKey2: "newValue2" }
);

// 4. Delete

// Delete One Document
db.collectionName.deleteOne({ filterKey: "value" });

// Delete Multiple Documents
db.collectionName.deleteMany({ filterKey: "value" });