[Mongo] Simple Operation command

1. Connect to the server:

Mongo

2. Connect to the database

Use dbname

3. Querying the names of all collections

Db.getcollectionnames ()

4. Querying data for a collection

Db.collection.find ()

Db.collection.find ({columnname: "value"})//accept only one parameter

5. Inserting data in a collection

Insert a single column of data: Db.collection.insert ({columnname: "value"})

Insert a two-column data: Db.collection.insert ({columnname1: "value1", columnname2: "value2"})

Insert multiple records: for (i=1;i<100;i++) Db.collection.insert ({columnname:i})

6. Updating Data

Db.collection.update ({column1:1},{column1:999})

Db.collection.update ({column1:100},{$set: {column2:99}})//Set Column2 for record Column1 to 100 to 99

7. Delete

Delete Table: Db.collection.drop

Delete database: Db.dropdatabase ()

Delete Record: Db.collection.remove ({column:100})

[Mongo] Simple Operation command