import { CompositeClause } from './composite-clause.model';
import { DbHelperModel } from '../db-helper-model.model';
import { QueryResult } from '../../interfaces/query-result.interface';
import { Observable } from 'rxjs/Observable';
import { DbQuery } from '../db-query.model';
import { ClauseGroup } from './clause-group.model';
import { Clause } from './clause.model';
/**
 * @public
 * @class QueryDelete
 *
 * @description
 * For design reasons this class should not be used directly. Use this class through {@link Delete} function.
 *
 * @param T @extends DbHelperModel a model declared with table
 *          and column annotations
 *
 * @example
 * ```typesrcript
 * // Delete a specific model using Delete
 * // assume that "todo" is declared before and is a model extending
 * // DbHelperModel and using Table + Column annotation
 * Delete(todo).exec().subscribe((qr: QueryResult<any>) => {
 *      // the model is deleted...
 * }, (err) => {
 *      // manage th error...
 * });
 * // You could use Delete statement to delete many entries
 * Delete(Todo).where({isDone: true}).exec().subscribe((qr: QueryResult<any>) => {
 *      // all done todos are deleted !
 * }, (err) => {
 *      // manage th error...
 * });
 * ```
 *
 * @author  Olivier Margarit
 * @since   0.1
 */
export declare class QueryDelete<T extends DbHelperModel> {
    private model;
    /**
     * @private
     * @constant {string} type the type of statement, should not be modified
     */
    private readonly type;
    /**
     * @private
     * @property {ClauseGroup} whereClauses is {@link ClauseGroup} instance containing
     * where clauses
     */
    private whereClauses;
    /**
     * @public
     * @constructor should not be use directly, see class header
     *
     * @param {T | {new(): T }} model DbHelperModel extention
     */
    constructor(model: T | {
        new (): T;
    });
    /**
     * @public
     * @method where is the method to add clauses to the where statement of the query
     * see {@link Clause} or {@link ClauseGroup}
     *
     * @param {Clause|Clause[]|ClauseGroup|CompositeClause|{[index: string]: any}} clauses list of clauses
     *
     * @return {QueryDelete<T>} this instance to chain query instructions
     */
    where(clauses: Clause | Clause[] | ClauseGroup | CompositeClause | {
        [index: string]: any;
    }): QueryDelete<T>;
    /**
     * @public
     * @method build should be removed to be a part of the private API
     *
     * @return {DbQuery} of the query with the string part and
     *          clauses params.
     */
    build(): DbQuery;
    /**
     * @public
     * @method exec to execute the query and asynchronously retreive result.
     *
     * @return {Observable<QueryResult<any>>} observable to subscribe and retrieve results
     */
    exec(): Observable<QueryResult<any>>;
}