Query Managers

Query managers are used for querying data from an underlying data store such as a SQL database

Connection details for query managers are defined using system elements, which allows defining them once and reusing them across different state and query elements.

Query managers connect to a specific system, translate Rierino query format to query statements in that system's domain specific language and return results in JSON form. Typically, a separate query manager is defined for each database.

It is possible to define any number and type of new query managers with specialized configurations, and typical managers deployed with Rierino are described in this section. A number of settings are shared across all query manager types:

Setting	Definition	Example	Default
manager	Fully qualified class name for the query manager	com.rierino.query.manager.MongoQueryManager	-
retriesPerStep	Allowed number of retries at each backoff step during reconnect	3	1
backoffSteps	Comma separated list of milliseconds to wait between backoff steps	10,20,30	10,100,200,500,1000,1000,10000
logDetail	Whether detailed trace logs should be performed (always/never) independent of the current logging level	never	-
telemetry.enabled	Whether handler should produce OpenTelemetry traces & metrics	false	true

315B

query-master-0001.json

Open

Example Query Manager Definition (Can be Imported on Element Screen)