MongoDB Common Operations--command line

Increase:

Db:

Use db_name//If there is a switch

Tabale:

There is no direct command to automatically generate when inserting a document

File

Db.table_name.insert ({' Test ': ' OK '})

Field:

Db.table_name.update ({' Test ': {$exists: true}},{$set: {' test2 ': ' Yes '}},{multi:true})//Insert ' test2 ' field into all documents containing ' test ' field

Db.table_name.update ({' Test ': {$exists: true}},{$set: {' test2 ': ' Yes '}})//Find the first document containing the ' Test ' field insert ' test2 ' field

Db.table_name.update ({' Test ': ' OK '},{$set: {' test2 ': ' Yes '}},{multi:true})//Insert ' test2 ' field into all documents containing ' test ': ' OK ' key-value pairs

By deleting:

Db:

Db.dropdatabase ()//delete current database

Table

Db.table_name.drop ()

File

Db.table_name.remove ({' Test ': {$exists: True}},{justone:true})//delete the first one found

Db.table_name.remove ({' Test ': {$exists: true}})//delete all

Field:

Db.table_name.update ({//Search condition},{$unset: {' Test ': '}},{multi:true} ')//delete all fields that meet {condition}

Check:

Db:

Show DBS

Table

Show tables

File

Db.table_name.find ({//Search condition}). Pretty ()//pretty () formatted display

Field:

No

Change:

Db:

Use Db_name

Table

No

File

Db.table_name.update ({' Test ': {$exists: true}},{' test2 ': ' Yes '},{multi:true})//Replace all document contents containing test with {' test2 ': ' Yes '}// The ' _id ' value does not change

Field:

Db.table_name.update ({' Test ': {$exists: true}},{$set: {' Test ': ' Yes '}},{multi:true})//To the ' Test ' field value for all documents containing ' test ' field ' Yes '

　　　　

MongoDB Common Operations--command line