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

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

/*
 * Copyright (c) 2015, 2022, Oracle and/or its affiliates.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License, version 2.0, as
 * published by the Free Software Foundation.
 *
 * This program is also distributed with certain software (including
 * but not limited to OpenSSL) that is licensed under separate terms,
 * as designated in a particular file or component or in included license
 * documentation.  The authors of MySQL hereby grant you an
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 * with the separately licensed software that they have included with
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 * Without limiting anything contained in the foregoing, this file,
 * which is part of MySQL Connector/Node.js, is also subject to the
 * Universal FOSS Exception, version 1.0, a copy of which can be found at
 * http://oss.oracle.com/licenses/universal-foss-exception.
 *
 * This program is distributed in the hope that it will be useful, but
 * 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 Binding = require('./Binding');
const Filtering = require('./Filtering');
const Limiting = require('./Limiting');
const Ordering = require('./CollectionOrdering');
const Preparing = require('./Preparing');
const Query = require('./Query');
const Result = require('./Result');
const errors = require('../constants/errors');
const type = require('../Protocol/Stubs/mysqlx_prepare_pb').Prepare.OneOfMessage.Type.DELETE;
const util = require('util');

/**
 * Factory function that creates an instance of a statement to remove
 * one or more documents from a collection.
 * @module CollectionRemove
 * @mixes Binding
 * @mixes CollectionOrdering
 * @mixes Limiting
 * @see {@link https://dev.mysql.com/doc/x-devapi-userguide/en/crud-ebnf-collection-crud-functions.html#crud-ebnf-collectionremovefunction|CollectionRemoveFunction}
 */

/**
 * @private
 * @alias module:CollectionRemove
 * @param {module:Connection} connection - The instance of the current
 * database connection.
 * @param {ExpressionTree} criteria - An Object representation of an X
 * DevAPI expression instance that establishes the criteria to use when
 * searching for the document to revmoe.
 * @param {module:Schema} schema - The Instance of the schema where the
 * statement is being executed.
 * @param {string} tableName - The name of the table where the statement is
 * being executed.
 * @returns {module:CollectionRemove}
 */
function CollectionRemove ({ connection, criteria, schema, tableName } = {}) {
    // A CollectionRemove statement can be prepared, so it needs to provide
    // the appropriate capabilities and API.
    let preparable = Preparing({ connection });

    // The CollectionRemove API is composed of multiple mixins that, each one,
    // introduce specific aspects and capabilities of the statement.
    preparable = {
        ...Binding(),
        ...Filtering({ constraints: { criteria } }),
        ...Ordering({ preparable }),
        ...Limiting({ preparable }),
        ...Query({ schema, tableName, type }),
        ...preparable
    };

    // The CollectionRemove API also introduces its own specific API.
    return {
        ...preparable,

        /**
         * Executes the statement in the database that removes all documents
         * from the collection that match the given criteria.
         * @function
         * @name module:CollectionRemove#execute
         * @return {Promise.<module:Result>}  <code>Promise</code> that
         * resolves to an object containing the details reported by the server.
         */
        execute () {
            // An explicit criteria needs to be provided. This is to avoid
            // updating all documents in a collection by mistake.
            if (!this.getCriteria_()) {
                return Promise.reject(new Error(util.format(errors.MESSAGES.ER_DEVAPI_MISSING_DOCUMENT_CRITERIA, 'remove()')));
            }

            // Before trying to send any message to the server, we need to
            // check if the connection is open (has a client instance) or if
            // it became idle in the meantime.
            if (!connection.isOpen() || connection.isIdle()) {
                // There is always a default error (ER_DEVAPI_CONNECTION_CLOSED).
                return Promise.reject(connection.getError());
            }

            const fn = () => connection.getClient().crudRemove(this);

            return preparable.execute(fn)
                .then(details => Result(details));
        }
    };
}

module.exports = CollectionRemove;