/**
 * Defines how to connect to the database and run queries e.g. via plugins.
 */
export class Connection {
    /**
     * Called by {@link Query#connect} and {@link Transaction#connect} to connect
     * to the database (or acquire clients from a connection pool).
     *
     * @throws {ConnectionError} If the method is not implemented.
     */
    create(): void;
    /**
     * Called by {@link Query#execute}, {@link Transaction#_begin},
     * {@link Transaction#_commit} and {@link Transaction#_rollback} to execute a
     * query with the connection created by {@link Connection#create}.
     *
     * @param {string|object} sql The SQL to query.
     * @param {string} sql.text The parameterized SQL string (with placeholders),
     * when `sql` is passed as an object.
     * @param {array} sql.values The values for the parameterized SQL string, when
     * `sql` is passed as an object.
     *
     * @throws {ConnectionError} If the method is not implemented.
     */
    query(): void;
    /**
     * Called by {@link Query#disconnect} and {@link Transaction#disconnect} to
     * close the connection created by {@link Connection#create}.
     *
     * @param {QueryError} [error] If {@link Query#disconnect} was called with an
     * error, that error is passed as this param. That error will have usually
     * originated from {@link Query#query}.
     *
     * @throws {ConnectionError} If the method is not implemented.
     */
    close(): void;
    /**
     * A reference to the {@link Knorm} instance.
     *
     * ::: tip
     * This is the same instance assigned to the {@link Connection.knorm} static
     * property, just added as a convenience for use in instance methods.
     * :::
     */
    knorm: any;
}
export namespace Connection {
    export { ConnectionError };
    export const knorm: any;
}
declare class ConnectionError extends KnormError {
    constructor(...args: any[]);
}
import { KnormError } from "./KnormError";
export {};