import { EventEmitter } from "events";
import { IDbConn, IDefaultDbConnConf, IQueryColumnDef, ISOLATION_LEVEL } from "@simplysm/sd-orm-common";
export declare class MysqlDbConn extends EventEmitter implements IDbConn {
    private readonly _mysql2;
    readonly config: IDefaultDbConnConf;
    private static readonly ERR_NOT_CONNECTED;
    private static readonly ERR_ALREADY_CONNECTED;
    private readonly _logger;
    private readonly _timeout;
    private _conn?;
    private _connTimeout?;
    isConnected: boolean;
    isOnTransaction: boolean;
    constructor(_mysql2: typeof import("mysql2/promise"), config: IDefaultDbConnConf);
    connectAsync(): Promise<void>;
    closeAsync(): Promise<void>;
    beginTransactionAsync(isolationLevel?: ISOLATION_LEVEL): Promise<void>;
    commitTransactionAsync(): Promise<void>;
    rollbackTransactionAsync(): Promise<void>;
    executeAsync(queries: string[]): Promise<any[][]>;
    executeParametrizedAsync(query: string, params?: any[]): Promise<any[][]>;
    bulkInsertAsync(tableName: string, columnDefs: IQueryColumnDef[], records: Record<string, any>[]): Promise<void>;
    bulkUpsertAsync(tableName: string, columnDefs: IQueryColumnDef[], records: Record<string, any>[]): Promise<void>;
    private _assertConnected;
    private _resetState;
    private _buildBulkValuesQuery;
    private _stopTimeout;
    private _startTimeout;
}