import { ITransaction } from './ITransaction';
import { IQueryResult } from './IQueryResult';
import { IDatabaseHealth } from './IDatabaseHealth';
/**
 * Abstract database adapter interface
 * All concrete database adapters MUST implement this interface
 */
export interface IDatabaseAdapter {
    /**
     * Connect to database
     * @throws ConnectionError if connection fails
     */
    connect(): Promise<void>;
    /**
     * Disconnect from database
     * @throws Error if disconnection fails
     */
    disconnect(): Promise<void>;
    /**
     * Check if database is connected
     * @returns true if connected
     */
    isConnected(): boolean;
    /**
     * Begin a new transaction
     * @returns Transaction instance
     * @throws Error if not connected or transaction creation fails
     */
    beginTransaction(): Promise<ITransaction>;
    /**
     * Execute a query
     * @template T - Type of rows returned
     * @param sql - SQL query string
     * @param params - Query parameters
     * @returns Query result with rows and metadata
     * @throws QueryError if query fails
     */
    query<T = any>(sql: string, params?: any[]): Promise<IQueryResult<T>>;
    /**
     * Check database health
     * @returns Health status including connection state, latency, and version
     */
    healthCheck(): Promise<IDatabaseHealth>;
}
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