81 lines
2.2 KiB
JavaScript
81 lines
2.2 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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* selectstream.js
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*
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* DESCRIPTION
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* Executes a basic query using a Readable Stream.
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* Uses Oracle's sample HR schema.
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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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var rowcount = 0;
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oracledb.getConnection(
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{
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user : dbConfig.user,
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password : dbConfig.password,
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connectString : dbConfig.connectString
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},
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function(err, connection) {
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if (err) {
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console.error(err.message);
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return;
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}
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var stream = connection.queryStream(
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'SELECT first_name, last_name FROM employees ORDER BY employee_id',
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[], // no binds
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{ fetchArraySize: 150 } // internal buffer size for performance tuning
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);
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stream.on('error', function (error) {
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// console.log("stream 'error' event");
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console.error(error);
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return;
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});
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stream.on('metadata', function (metadata) {
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// console.log("stream 'metadata' event");
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console.log(metadata);
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});
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stream.on('data', function (data) {
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// console.log("stream 'data' event");
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console.log(data);
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rowcount++;
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});
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stream.on('end', function () {
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// console.log("stream 'end' event");
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console.log('Rows selected: ' + rowcount);
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connection.close(
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function(err) {
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if (err) {
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console.error(err.message);
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}
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});
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});
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});
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