MongoDB

MongoDB Data Connector Documentation

MongoDB is an open-source NoSQL database that stores data in flexible, JSON-like documents, providing dynamic schemas and easy scalability.

The MongoDB Data Connector enables federated/accelerated SQL queries on data stored in MongoDB databases.

datasets:
  - from: mongodb:mytable
    name: my_dataset
    params:
      mongodb_host: localhost
      mongodb_port: 27017
      mongodb_db: my_database
      mongodb_user: my_user
      mongodb_pass: ${secrets:mongodb_pass}
      mongodb_pool_min: 0
      mongodb_pool_max: 10

Configuration

from

The from field takes the form mongodb:{table_name} where table_name is the table identifer in the MongoDB server to read from.

Unquoted identifiers are normalized to lowercase. To reference a collection with mixed-case characters, wrap it in double quotes: mongodb:"MixedCaseCollection". See Identifier Case Sensitivity.

datasets:
  - from: mongodb:mytable
    name: my_dataset
    params:
      mongodb_db: my_database
      ...

name

The dataset name. This will be used as the table name within Spice.

Example:

datasets:
  - from: mongodb:my_dataset
    name: cool_dataset
    params: ...

SELECT COUNT(*) FROM cool_dataset;

+----------+
| count(*) |
+----------+
| 6001215  |
+----------+

params

The MongoDB data connector can be configured by providing the following params. Use the secret replacement syntax to load the secret from a secret store, e.g. ${secrets:my_mongodb_conn_string}.

Parameter Name	Description
mongodb_connection_string	The connection string to use to connect to the MongoDB server. This can be used instead of providing individual connection parameters.
mongodb_user	The MongoDB username.
mongodb_pass	The password to connect with.
mongodb_host	The hostname of the MongoDB server.
mongodb_port	The port of the MongoDB server.
mongodb_db	The name of the database to connect to.
mongodb_sslmode	Optional. Specifies the SSL/TLS behavior for the connection, supported values: required (default) requires an SSL connection, preferred tries SSL but falls back to insecure if unavailable, disabled does not use SSL.
mongodb_sslrootcert	Optional parameter specifying the path to a custom PEM certificate that the connector will trust.
mongodb_time_zone	Optional. Specifies connection time zone. Default is UTC. Accepts fixed offsets (e.g., +02:00) or IANA time zone names (e.g., America/Los_Angeles).
mongodb_auth_source	Optional. Authentication source database. Overrides the default auth source in the connection string.
mongodb_unnest_depth	Optional. Maximum nesting depth for unnesting embedded documents into a flattened structure. Higher values expand deeper nested fields. Default: 0
mongodb_num_docs_to_infer_schema	Optional. Number of documents to use to infer the schema. Defaults to 400.
mongodb_pool_min	The minimum number of connections to keep open in the pool, lazily created when requested. Default: 0
mongodb_pool_max	The maximum number of connections in the pool. Default: 10

Types

The table below shows the MongoDB data types supported, along with the type mapping to Apache Arrow types in Spice.

MongoDB Type	Arrow Type
String	Utf8
Boolean	Boolean
Int32	Int32
Int64	Int64
Double	Float64
Decimal128	Decimal128
Binary	Binary
Datetime without time	Date32
Datetime with time	Timestamp(Millisecond, <Timezone>)
Timestamp	Timestamp(Millisecond, None)
Array	List<Utf8>
Null	Null
Undefined	Null
RegularExpression	Utf8
JavaScriptCode	Utf8
JavaScriptCodeWithScope	Utf8
Symbol	Utf8
MaxKey	Utf8
MinKey	Utf8
DbPointer	Utf8
ObjectId	Utf8
Document	See unnesting section

The MongoDB Datetime value is retrieved as a UTC time value by default. Use the mongodb_time_zone configuration parameter to specify the desired time zone for interpreting TIMESTAMP values during data retrieval.

Unnesting

Consider the following document:

{
  "a": 1,
  "b": {
    "x": 2,
    "y": {
      "z": 3
    }
  }
}

Using mongodb_unnest_depth you can control the unnesting behavior. Here are the examples:

mongodb_unnest_depth: 0

sql> select * from test_table;
+-----------+---------------------+
| a (Int32) | b (Utf8)            |
+-----------+---------------------+
| 1         | {"x":2,"y":{"z":3}} |
+---+-----------------------------+

mongodb_unnest_depth: 1

sql> select * from test_table;
+-----------+-------------+------------+
| a (Int32) | b.x (Int32) | b.y (Utf8) |
+-----------+-------------+------------+
| 1         | 2           | {"z":3}    | 
+-----------+-------------+------------+

mongodb_unnest_depth: 2

sql> select * from test_table;
+-----------+-------------+---------------+
| a (Int32) | b.x (Int32) | b.y.z (Int32) |
+-----------+-------------+---------------+
| 1         | 2           | 3             |
+-----------+-------------+---------------+

Examples

Connecting using username and password and custom auth table

datasets:
  - from: mongodb:my_dataset
    name: my_dataset
    params:
      mongodb_host: localhost
      mongodb_port: 27017
      mongodb_db: my_database
      mongodb_user: my_user
      mongodb_pass: ${secrets:mongodb_pass}
      mongodb_auth_source: admin

Connecting using SSL

datasets:
  - from: mongodb:my_dataset
    name: my_dataset
    params:
      mongodb_host: localhost
      mongodb_port: 27017
      mongodb_db: my_database
      mongodb_user: my_user
      mongodb_pass: ${secrets:mongodb_pass}
      mongodb_sslmode: preferred
      mongodb_sslrootcert: ./custom_cert.pem

Connecting using a Connection String

datasets:
  - from: mongodb:my_dataset
    name: my_dataset
    params:
      mongodb_connection_string: mongodb://${secrets:my_user}:${secrets:my_password}@localhost:27017/my_db?authSource=admin

With custom connection pool settings

datasets:
  - from: mongodb:my_dataset
    name: my_dataset
    params:
      mongodb_host: localhost
      mongodb_port: 27017
      mongodb_db: my_database
      mongodb_user: my_user
      mongodb_pass: ${secrets:mongodb_pass}
      mongodb_pool_min: 5
      mongodb_pool_max: 10