import { IDatabaseAdapter, IDatabaseConfig, IDatabaseHealth, IQueryResult, ITransaction } from '../interfaces';
/**
 * Abstract base class for database adapters
 * Provides common functionality for all implementations
 */
export declare abstract class BaseDatabaseAdapter implements IDatabaseAdapter {
    protected config: IDatabaseConfig;
    protected connected: boolean;
    constructor(config: IDatabaseConfig);
    /**
     * Abstract methods - MUST be implemented by concrete adapters
     */
    abstract connect(): Promise<void>;
    abstract disconnect(): Promise<void>;
    abstract query<T = any>(sql: string, params?: any[]): Promise<IQueryResult<T>>;
    abstract beginTransaction(): Promise<ITransaction>;
    abstract healthCheck(): Promise<IDatabaseHealth>;
    /**
     * Check if database is connected
     */
    isConnected(): boolean;
    /**
     * Ensure database is connected before operations
     * @throws ConnectionError if not connected
     */
    protected ensureConnected(): void;
    /**
     * Sanitize error messages to remove sensitive data
     * @param error - Original error
     * @returns Sanitized error
     */
    protected sanitizeError(error: unknown): Error;
}
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