Query is a wrapper around a query, containing the query name and the query itself.

Client represents a client for working with the database.

DB is an interface for working with the database.

NamedExecer is an interface for working with named queries using tags in structures.

Pinger is an interface for checking the connection to the database.

QueryExecer is an interface for working with regular queries.

SQLExecer combines NamedExecer and QueryExecer.

Transactor is an interface for working with transactions.

TxManager is a transaction manager that executes the specified handler within a transaction.

Handler is a function that is executed within a transaction.