import { CompositeClause } from './composite-clause.model';
import { IQueryHelper } from '../interfaces/i-query-helper.interface';
import { IJoin } from '../interfaces/i-join.interface';
import { DbHelperModel } from '../db-helper-model.model';
import { DbTable } from '../structure/db-table.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 QuerySelect
 *
 * @description
 * For design reasons this class should not be used directly. Use this class with {@link Select} function.
 *
 * @param T @extends DbHelperModel a model declared with table and column annotations
 *
 * @example
 * ```typescript
 * // select todos
 * Select(Todo).where({isDone: false}}).exec().subscribe((qr: QueryResult<Todo>) => {
 *      // do something with the result...
 * }, (err) => {
 *      // do something with the error...
 * });
 * ```
 *
 * @author  Olivier Margarit
 * @since   0.1
 */
export declare class QuerySelect<T extends DbHelperModel> implements IQueryHelper {
    private model;
    /**
     * @private
     * @constant {string} type query type
     */
    private readonly type;
    /**
     * @private
     * @property {Array<IJoin>} joins list of join for the query
     */
    private joins;
    /**
     * @private
     * @property {ClauseGroup} whereClauses clause group instance containing where clauses
     */
    private whereClauses;
    /**
     * @private
     * @property {Array<string>} proj is the query projection
     */
    private proj;
    /**
     * @private
     * @property {string} grpBy is the group by condition of the query
     */
    private grpBy;
    /**
     * @private
     * @property {string} ordrBy order by condition for the query
     */
    private ordrBy;
    /**
     * @private
     * @property size, the number of element returned by the select query
     */
    private size;
    /**
     * @private
     * @property {number} page the paginated number of the query select
     */
    private page;
    /**
     * @private
     * @property {string} alias the query alias to prevent column collision
     */
    alias: string;
    /**
     * @public
     * @constructor should not be use directly, see class header
     *
     * @param {{new(): T}} model extention
     */
    constructor(model: {
        new (): T;
    });
    /**
     * @public
     * @method copy method to copy QuerySelect
     *
     * @return {QuerySelect<T>} the query select copy
     *
     * @since 0.2
     */
    copy(): QuerySelect<T>;
    /**
     * @public
     * @method projection customize the select column of the QueryResult
     *         for performance optimization if needed.
     *
     * @param {Array<string>} proj the projection
     *
     * @return {QuerySelect<T>} this instance to chain query instructions
     */
    projection(proj: string[]): QuerySelect<T>;
    /**
     * @public
     * @method join add query join to query select
     *
     * @param {IJoin|Array<IJoin>} joinQuery join query or list of join queries
     *
     * @return {QuerySelect<T>} the instance itself to chain operation
     */
    join(joinQuery: IJoin | IJoin[]): QuerySelect<T>;
    /**
     * @public
     * @method where is the method to add clauses to the where statement of the query
     * see {@link Clause} or {@link ClauseGroup} or {@link CompositeClause}
     *
     * @param {Clause|Clause[]|CompositeClause|ClauseGroup|{[index: string]: any}} clauses  where clauses
     *
     * @return {QuerySelect<T>} this instance to chain query instructions
     */
    where(clauses: Clause | Clause[] | CompositeClause | ClauseGroup | {
        [index: string]: any;
    }): QuerySelect<T>;
    /**
     * @public
     * @method groupBy add group by instructions to the query
     *
     * @param {string} group string whith the column to group by
     *
     * @return {QuerySelect<T>} this instance to chain query instructions
     */
    groupBy(group: string): QuerySelect<T>;
    /**
     * @public
     * @method orderBy add order by instructions to the query
     *
     * @param {string} order string whith the column to order by
     *
     * @return {QuerySelect<T>} this instance to chain query instructions
     */
    orderBy(order: string): QuerySelect<T>;
    /**
     * @public
     * @method setPage set the page result for pagination
     *
     * @param {number} page page number of the result
     *
     * @return {QuerySelect<T>} this instance to chain query instructions
     */
    setPage(page: number): QuerySelect<T>;
    /**
     * @public
     * @method setSize set the size of the page result for pagination
     *
     * @param {number} size page size number of the result
     *
     * @return {QuerySelect<T>} this instance to chain query instructions
     */
    setSize(size: number): QuerySelect<T>;
    getSize(): number;
    getPage(): number;
    /**
     * @public
     * @method getProjectedTable get virtual table representing the result table expected
     *
     * @return {DbTable} the virtual table
     */
    getProjectedTable(): DbTable;
    /**
     * @private
     * @method getJoinProjection get the projection of join query
     *
     * @return {string} the projection
     */
    private getJoinProjection();
    /**
     * @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<T>>} observable to subscribe and retrieve typed result
     */
    exec(): Observable<QueryResult<T>>;
    /**
     * @public
     * @method exec to execute the query and asynchronously retreive result.
     *
     * @return {Observable<QueryResult<any>>} observable to subscribe and retrieve result
     *
     * @since 0.2
     */
    execRaw(): Observable<QueryResult<any>>;
}