78 lines
2.3 KiB
JavaScript
78 lines
2.3 KiB
JavaScript
/* Copyright (c) 2016, 2018, Oracle and/or its affiliates. All rights reserved. */
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/******************************************************************************
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*
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* You may not use the identified files except in compliance with the Apache
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* License, Version 2.0 (the "License.")
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*
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* You may obtain a copy of the License at
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* http://www.apache.org/licenses/LICENSE-2.0.
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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*
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*
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* NAME
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* resultsettoquerystream.js
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*
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* DESCRIPTION
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* Converts a ResultSet returned from execute() into a Readable Stream.
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* This is an alternative instead of using resultset.getRows().
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* Note: using connection.queryStream() is recommended for top level
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* queries because it avoids having to duplicate error handling in the
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* callback and event.
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*
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* Scripts to create the HR schema can be found at:
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* https://github.com/oracle/db-sample-schemas
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*
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*****************************************************************************/
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var oracledb = require('oracledb');
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var dbConfig = require('./dbconfig.js');
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oracledb.getConnection(
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dbConfig,
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function(err, connection) {
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if (err) { console.error(err.message); return; }
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var sql = "SELECT employee_id, last_name FROM employees WHERE ROWNUM < 25 ORDER BY employee_id";
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connection.execute(
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sql,
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[],
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{
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resultSet: true
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},
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function(err, result) {
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if (err) {
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console.error(err.message);
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doRelease(connection);
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return;
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}
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var queryStream = result.resultSet.toQueryStream();
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queryStream.on('data', function(row) {
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console.log(row);
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});
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queryStream.on('error', function(err) {
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console.error(err.message);
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doRelease(connection);
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});
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queryStream.on('close', function() {
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doRelease(connection);
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});
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}
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);
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}
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);
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function doRelease(connection) {
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connection.close(
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function(err) {
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if (err) { console.error(err.message); }
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});
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}
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