101 lines
3.1 KiB
JavaScript
101 lines
3.1 KiB
JavaScript
/* Copyright (c) 2015, 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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* resultset1.js
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*
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* DESCRIPTION
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* Executes a query and uses a ResultSet to fetch rows with getRow().
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* Uses Oracle's sample HR schema.
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*
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* Note using queryStream() or getRows() is recommended instead of
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* getRow().
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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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// For getRow(), the fetchArraySize property can be adjusted to tune
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// data transfer from the Oracle Database to node-oracledb. The value
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// of fetchArraySize does not affect how, or when, rows are returned
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// by node-oracledb to the application. Buffering is handled by
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// node-oracledb. Benchmark to choose the optimal size for each
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// application or query.
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//
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// oracledb.fetchArraySize = 100; // default value is 100
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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) { console.error(err.message); return; }
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connection.execute(
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`SELECT employee_id, last_name
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FROM employees
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WHERE ROWNUM < 11
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ORDER BY employee_id`,
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[], // no bind variables
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{ resultSet: true }, // return a ResultSet. Default is false
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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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// console.log(result);
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fetchOneRowFromRS(connection, result.resultSet);
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});
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});
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function fetchOneRowFromRS(connection, resultSet) {
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resultSet.getRow( // get one row
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function (err, row) {
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if (err) {
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console.error(err.message);
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doClose(connection, resultSet); // always close the ResultSet
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} else if (!row) { // no rows, or no more rows
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doClose(connection, resultSet); // always close the ResultSet
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} else {
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rowCount++;
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console.log("fetchOneRowFromRS(): row " + rowCount);
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console.log(row);
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fetchOneRowFromRS(connection, resultSet);
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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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function doClose(connection, resultSet) {
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resultSet.close(
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function(err) {
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if (err) { console.error(err.message); }
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doRelease(connection);
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});
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}
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