111 lines
3.8 KiB
JavaScript
111 lines
3.8 KiB
JavaScript
/* Copyright (c) 2015, 2022, Oracle and/or its affiliates. */
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/******************************************************************************
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*
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* This software is dual-licensed to you under the Universal Permissive License
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* (UPL) 1.0 as shown at https://oss.oracle.com/licenses/upl and Apache License
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* 2.0 as shown at http://www.apache.org/licenses/LICENSE-2.0. You may choose
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* either license.
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*
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* If you elect to accept the software under the Apache License, Version 2.0,
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* the following applies:
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* https://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,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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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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* select1.js
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*
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* DESCRIPTION
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* Executes a basic query without using a connection pool or ResultSet.
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*
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* For a connection pool example see connectionpool.js
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* For a ResultSet example see resultset2.js
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* For a query stream example see selectstream.js
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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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'use strict';
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const fs = require('fs');
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const oracledb = require('oracledb');
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const dbConfig = require('./dbconfig.js');
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const demoSetup = require('./demosetup.js');
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// On Windows and macOS, you can specify the directory containing the Oracle
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// Client Libraries at runtime, or before Node.js starts. On other platforms
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// the system library search path must always be set before Node.js is started.
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// See the node-oracledb installation documentation.
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// If the search path is not correct, you will get a DPI-1047 error.
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let libPath;
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if (process.platform === 'win32') { // Windows
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libPath = 'C:\\oracle\\instantclient_19_12';
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} else if (process.platform === 'darwin') { // macOS
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libPath = process.env.HOME + '/Downloads/instantclient_19_8';
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}
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if (libPath && fs.existsSync(libPath)) {
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oracledb.initOracleClient({ libDir: libPath });
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}
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async function run() {
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let connection;
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try {
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// Get a non-pooled connection
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connection = await oracledb.getConnection(dbConfig);
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await demoSetup.setupBf(connection); // create the demo table
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const result = await connection.execute(
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// The statement to execute
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`SELECT farmer, picked, ripeness
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FROM no_banana_farmer
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where id = :idbv`,
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// The "bind value" 3 for the bind variable ":idbv"
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[3],
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// Options argument. Since the query only returns one
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// row, we can optimize memory usage by reducing the default
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// maxRows value. For the complete list of other options see
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// the documentation.
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{
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maxRows: 1
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//, outFormat: oracledb.OUT_FORMAT_OBJECT // query result format
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//, extendedMetaData: true // get extra metadata
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//, prefetchRows: 100 // internal buffer allocation size for tuning
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//, fetchArraySize: 100 // internal buffer allocation size for tuning
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});
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console.log(result.metaData); // [ { name: 'FARMER' }, { name: 'PICKED' }, { name: 'RIPENESS' } ]
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console.log(result.rows); // [ [ 'Mindy', 2019-07-16T03:30:00.000Z, 'More Yellow than Green' ] ]
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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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// Connections should always be released when not needed
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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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