import { Config, QueryResult } from '../types';
/**
 * Trino client wrapper for Treasure Data
 * Handles authentication, query execution, and connection management
 */
export declare class TDTrinoClient {
    private config;
    private catalog;
    private client;
    private defaultDatabase;
    constructor(config: Config);
    /**
     * Executes a SQL query and returns the results
     * @param sql - SQL query to execute
     * @returns Query results with columns and data
     * @throws {Error} If query fails
     */
    query(sql: string): Promise<QueryResult>;
    /**
     * Executes a SQL statement (for write operations)
     * @param sql - SQL statement to execute
     * @returns Execution result with affected rows count
     * @throws {Error} If execution fails
     */
    execute(sql: string): Promise<{
        affectedRows: number;
        success: boolean;
    }>;
    testConnection(): Promise<boolean>;
    /**
     * Escapes a SQL identifier to prevent SQL injection
     * @param identifier - The identifier to escape
     * @returns Escaped identifier
     */
    escapeIdentifier(identifier: string): string;
    /**
     * Escapes a SQL string literal to prevent SQL injection
     * @param value - The string value to escape
     * @returns Escaped string literal
     */
    escapeStringLiteral(value: string): string;
    /**
     * Lists all databases accessible to the user
     * @returns Array of database names
     */
    listDatabases(): Promise<string[]>;
    /**
     * Lists all tables in a database
     * @param database - Database name
     * @returns Array of table names
     */
    listTables(database: string): Promise<string[]>;
    describeTable(database: string, table: string): Promise<Array<{
        name: string;
        type: string;
        nullable: boolean;
    }>>;
    private wrapError;
    destroy(): void;
    /**
     * Gets the current database/schema name
     */
    get database(): string;
}
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