@mysql/xdevapi/lib/DevAPI/TableOrdering.js

MySQL Connector/Node.js - A Node.js driver for MySQL using the X Protocol and X DevAPI.

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 * Copyright (c) 2017, 2022, Oracle and/or its affiliates.
 *
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 * published by the Free Software Foundation.
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 * which is part of MySQL Connector/Node.js, is also subject to the
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 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
 * See the GNU General Public License, version 2.0, for more details.
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 */

'use strict';

const SortExprStr = require('./SortExprStr');
const dataModel = require('../Protocol/Stubs/mysqlx_crud_pb').DataModel.TABLE;

/**
 * This mixin grants sorting capabilities to a table statement instance via
 * composition.
 * @mixin
 * @alias TableOrdering
 * @param {ExpressionTree[]} [orderList] - A list of order expression
 * instances for one ore more table columns.
 * @param {Preparing} preparable - The instance of the underlying prepared
 * statement.
 * @returns {TableOrdering}
 */
function TableOrdering ({ orderList = [], preparable }) {
    return {
        /**
         * Retrieves the list of ordering expressions associated to a given
         * table statement.
         * @private
         * @function
         * @name Filtering#getOrderList_
         * @returns {ExpressionTree[]} The List of order expression instances.
         */
        getOrderList_ () {
            return orderList;
        },

        /**
         * Establishes the order of one or more specific columns in the result
         * set.
         * This method does not cause the statement to be executed but changes
         * the statement boundaries, which means that if it has been prepared
         * before, it needs to be re-prepared.
         * @function
         * @name TableOrdering#orderBy
         * @param {...SortExprStrList} [sortExprStrList] - One or more
         * expressions establishing the order on which the given columns
         * are sorted.
         * @example
         * // arguments as columns (and direction) to sort
         * const query = table.select('foo', 'bar').orderBy('foo asc', 'bar desc')
         *
         * // array of columns (and direction) to sort
         * const query = table.select('foo', 'bar').orderBy(['foo asc', 'bar desc'])
         * @returns {TableOrdering} The Instance of the statement itself
         * following a fluent API convention.
         */
        orderBy (...sortExprStrList) {
            preparable.forceRestart();

            sortExprStrList.flat().forEach(sortExprStr => {
                orderList.push(SortExprStr({ dataModel, value: sortExprStr }).getValue());
            });

            return this;
        }
    };
}

module.exports = TableOrdering;