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Some mongoDB command for beginner

· 3 min read
Vũ Anh Tú

1. Log Into MongoDB​

mongo -u <username> -p <password> --authenticationDatabase <dbname>

Câu lệnh được sử dụng để xác thực vào db ở local

2. Show All Databases​

show dbs

Show tất cả các DB

3. Select Database to Work With​

use <dbname>

Chọn DB sử dụng

4. Authenticate and Log Out From Database​

// Authenticate
//
db.auth("username", "password");
//
// Logout
//
db.logout()

Khi chuyển sang một DB khác, cẩn phải xác thực để sử dụng DB và logout khỏi

5. List Down Collections, Users, Roles, etc.​

//
// List down collections of the current database
//
show collections;
db.getCollectionNames();
//
// List down all the users of current database
//
show users;
db.getUsers();
//
// List down all the roles
//
show roles

6. Create a Collection​

db.createCollection("collectionName");

7. Insert a Document in a Collection​

db.createCollection("collectionName");

7. Insert a Document in a Collection​

//
// Insert single document
//
db.<collectionName>.insert({field1: "value", field2: "value"})
//
// Insert multiple documents
//
db.<collectionName>.insert([{field1: "value1"}, {field1: "value2"}])
db.<collectionName>.insertMany([{field1: "value1"}, {field1: "value2"}])

8. Save or Update Document​

//
// Matching document will be updated; In case, no document matching the ID is found, a new document is created
//
db.<collectionName>.save({"_id": new ObjectId("jhgsdjhgdsf"), field1: "value", field2: "value"});

Câu lệnh này thực hiện hoặc là thêm mới họăc là update trường thông tin phụ thuộc voà giá trị của _id

9. Display Collection Records​

//
// Retrieve all records
//
db.<collectionName>.find();
//
// Retrieve limited number of records; Following command will print 10 results;
//
db.<collectionName>.find().limit(10);
//
// Retrieve records by id
//
db.<collectionName>.find({"_id": ObjectId("someid")});
//
// Retrieve values of specific collection attributes by passing an object having 
// attribute names assigned to 1 or 0 based on whether that attribute value needs 
// to be included in the output or not, respectively.
//
db.<collectionName>.find({"_id": ObjectId("someid")}, {field1: 1, field2: 1});
db.<collectionName>.find({"_id": ObjectId("someid")}, {field1: 0}); // Exclude field1
//
// Collection count
//
db.<collectionName>.count();

10. Administrative Commands​

//
// Get the collection statistics 
//
db.<collectionName>.stats()
db.printCollectionStats()
//
// Latency statistics for read, writes operations including average time taken for reads, writes
// and related umber of operations performed
//
db.<collectionName>.latencyStats()
//
// Get collection size for data and indexes
//
db.<collectionName>.dataSize() // Size of the collection
db.<collectionName>.storageSize() // Total size of document stored in the collection
db.<collectionName>.totalSize() // Total size in bytes for both collection data and indexes
db.<collectionName>.totalIndexSize() // Total size of all indexes in the collection