87 lines
2.4 KiB
JavaScript
87 lines
2.4 KiB
JavaScript
/* Copyright (c) 2015, 2019, 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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* resultset2.js
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*
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* DESCRIPTION
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* Executes a query and uses a ResultSet to fetch batches of rows
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* with getRows(). Also shows setting the fetch array size.
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* Uses Oracle's sample HR schema.
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*
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* This example uses Node 8's async/await syntax.
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*
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*****************************************************************************/
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const oracledb = require('oracledb');
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const dbConfig = require('./dbconfig.js');
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// Number of rows to return from each call to getRows()
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const numRows = 10;
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async function run() {
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let connection;
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try {
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connection = await oracledb.getConnection(dbConfig);
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const result = await connection.execute(
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`SELECT employee_id, last_name
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FROM employees
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WHERE ROWNUM < 25
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ORDER BY employee_id`,
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[], // no bind variables
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{
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resultSet: true // return a ResultSet (default is false)
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}
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);
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// Fetch rows from the ResultSet.
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//
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// If getRows(numRows) returns:
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// Zero rows => there were no rows, or are no more rows to return
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// Fewer than numRows rows => this was the last set of rows to get
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// Exactly numRows rows => there may be more rows to fetch
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const rs = result.resultSet;
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let rows;
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do {
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rows = await rs.getRows(numRows); // get numRows rows at a time
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if (rows.length > 0) {
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console.log("getRows(): Got " + rows.length + " rows");
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console.log(rows);
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}
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} while (rows.length === numRows);
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// always close the ResultSet
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await rs.close();
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} catch (err) {
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console.error(err);
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} finally {
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if (connection) {
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try {
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await connection.close();
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} catch (err) {
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console.error(err);
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}
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}
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}
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}
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run();
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