Query is the wrapper for raw DB query and its name.

Client interface is a client for DB.

DB interface for communication with DB.

NamedExecutor interface for named queries which use tags.

Pinger interface for checking DB connectivity.

QueryExecutor interface for common DB queries.

SQLExecutor interface gathers all DB query executors.

Transactor interface is used for DB transactions.

TxManager interface contains handler for transaction.

Handler is a function executed in transaction.