mongodb

Allows SELECT queries to be performed on data that is stored on a remote MongoDB server.

Syntax

mongodb(host:port, database, collection, user, password, structure [, options])

Arguments

host:port — MongoDB server address.
database — Remote database name.
collection — Remote collection name.
user — MongoDB user.
password — User password.
structure - The schema for the ClickHouse table returned from this function.
options - MongoDB connection string options (optional parameter).

Tip

If you are using the MongoDB Atlas cloud offering please add these options:

'connectTimeoutMS=10000&ssl=true&authSource=admin'

Also, you can connect by URI:

mongodb(uri, collection, structure)

Arguments

uri — Connection string.
collection — Remote collection name.
structure — The schema for the ClickHouse table returned from this function.

Returned Value

A table object with the same columns as the original MongoDB table.

Examples

Suppose we have a collection named my_collection defined in a MongoDB database named test, and we insert a couple of documents:

db.createUser({user:"test_user",pwd:"password",roles:[{role:"readWrite",db:"test"}]})

db.createCollection("my_collection")

db.my_collection.insertOne(
    { log_type: "event", host: "120.5.33.9", command: "check-cpu-usage -w 75 -c 90" }
)

db.my_collection.insertOne(
    { log_type: "event", host: "120.5.33.4", command: "system-check"}
)

Let's query the collection using the mongodb table function:

SELECT * FROM mongodb(
    '127.0.0.1:27017',
    'test',
    'my_collection',
    'test_user',
    'password',
    'log_type String, host String, command String',
    'connectTimeoutMS=10000'
)

or:

SELECT * FROM mongodb(
    'mongodb://test_user:password@127.0.0.1:27017/test?connectionTimeoutMS=10000',
    'my_collection',
    'log_type String, host String, command String'
)

See Also