import { EventNoticer } from './event';
import { PacketData } from './mysql/parser';
import { Field } from './mysql/query';
export interface Result extends PacketData {
    rows?: Dict[];
    fields?: Dict<Field>;
}
export interface Callback {
    (err: Error | null, data?: Result[]): void;
}
export interface Options {
    port?: number;
    host?: string;
    user?: string;
    password?: string;
    database?: string;
}
export declare const defaultOptions: Options;
/**
 * @class Database
 */
export declare abstract class Database {
    readonly options: Options;
    readonly onError: EventNoticer<Error>;
    constructor(options?: Options);
    /**
     * database statistics
     */
    abstract statistics(cb: Callback): void;
    /**
     * @func query()
     */
    abstract query(sql: string, cb: Callback): void;
    /**
     * close database connection
     */
    abstract close(): void;
    /**
     * srart transaction
     */
    abstract transaction(): void;
    /**
     * commit transaction
     */
    abstract commit(): void;
    /**
     * rollback transaction and clear sql command queue
     */
    abstract rollback(): void;
    /**
     * exec query database
     */
    exec(sql: string): Promise<any>;
}
/**
 * escape sql param
 */
export declare function escape(param: any): string;
declare const _default: {
    Database: typeof Database;
    escape: typeof escape;
};
export default _default;