/**
 * Low-level SQL connection contract used by driver integrations.
 *
 * A `Connection` is the driver-facing layer under `SqlClient`. It executes
 * already-compiled SQL with positional parameters and can return transformed
 * rows, raw driver results, streams, value arrays, or unprepared statement
 * results. This module also defines the scoped connection acquirer type, the
 * connection service tag, and the generic row shape.
 *
 * @since 4.0.0
 */
import * as Context from "../../Context.ts";
import type { Effect } from "../../Effect.ts";
import type { Scope } from "../../Scope.ts";
import type { Stream } from "../../Stream.ts";
import type { SqlError } from "./SqlError.ts";
/**
 * Low-level SQL driver connection capable of executing compiled SQL as
 * transformed rows, raw results, streams, value arrays, or unprepared
 * statements.
 *
 * @category models
 * @since 4.0.0
 */
export interface Connection {
    readonly execute: (sql: string, params: ReadonlyArray<unknown>, transformRows: (<A extends object>(row: ReadonlyArray<A>) => ReadonlyArray<A>) | undefined) => Effect<ReadonlyArray<any>, SqlError>;
    /**
     * Execute the specified SQL query and return the raw results directly from
     * underlying SQL client.
     */
    readonly executeRaw: (sql: string, params: ReadonlyArray<unknown>) => Effect<unknown, SqlError>;
    readonly executeStream: (sql: string, params: ReadonlyArray<unknown>, transformRows: (<A extends object>(row: ReadonlyArray<A>) => ReadonlyArray<A>) | undefined) => Stream<any, SqlError>;
    readonly executeValues: (sql: string, params: ReadonlyArray<unknown>) => Effect<ReadonlyArray<ReadonlyArray<unknown>>, SqlError>;
    readonly executeUnprepared: (sql: string, params: ReadonlyArray<unknown>, transformRows: (<A extends object>(row: ReadonlyArray<A>) => ReadonlyArray<A>) | undefined) => Effect<ReadonlyArray<any>, SqlError>;
}
/**
 * Scoped effect that acquires a `Connection`, may fail with `SqlError`, and
 * requires a `Scope` for release.
 *
 * @category models
 * @since 4.0.0
 */
export type Acquirer = Effect<Connection, SqlError, Scope>;
/**
 * Service tag for a low-level SQL `Connection`.
 *
 * @category services
 * @since 4.0.0
 */
export declare const Connection: Context.Service<Connection, Connection>;
/**
 * Generic SQL row shape mapping column names to unknown values.
 *
 * @category models
 * @since 4.0.0
 */
export type Row = {
    readonly [column: string]: unknown;
};
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