109 lines
3.0 KiB
JavaScript
109 lines
3.0 KiB
JavaScript
/* Copyright (c) 2015, 2020, 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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* lobinsert2.js
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*
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* DESCRIPTION
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* INSERTs text into a CLOB column using the 'RETURNING INTO' method.
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*
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* For smaller LOBs you will probably prefer the method shown in lobinsert1.js
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*
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* This example requires node-oracledb 1.12 or later.
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*
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*****************************************************************************/
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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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const inFileName = 'clobexample.txt'; // the file with text to be inserted into the database
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async function run() {
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let connection;
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try {
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const connection = await oracledb.getConnection(dbConfig);
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await demoSetup.setupLobs(connection); // create the demo table
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const result = await connection.execute(
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`INSERT INTO no_lobs (id, c) VALUES (:id, EMPTY_CLOB()) RETURNING c INTO :lobbv`,
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{
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id: 4,
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lobbv: {type: oracledb.CLOB, dir: oracledb.BIND_OUT}
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},
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{ autoCommit: false } // a transaction needs to span the INSERT and pipe()
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);
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if (result.rowsAffected != 1 || result.outBinds.lobbv.length != 1) {
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throw new Error('Error getting a LOB locator');
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}
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const lob = result.outBinds.lobbv[0];
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if (lob === null) {
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throw new Error('NULL lob found');
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}
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const doStream = new Promise((resolve, reject) => {
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lob.on('finish', () => {
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// console.log("lob.on 'finish' event");
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connection.commit((err) => {
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if (err) {
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lob.destroy(err);
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} else {
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console.log("Text inserted successfully.");
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resolve();
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}
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});
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});
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lob.on('error', (err) => {
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// console.log("lob.on 'error' event");
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reject(err);
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});
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console.log('Reading from ' + inFileName);
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const inStream = fs.createReadStream(inFileName);
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inStream.on('error', (err) => {
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// console.log("inStream.on 'error' event");
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lob.destroy(err);
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});
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inStream.pipe(lob); // copies the text to the LOB
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});
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await doStream;
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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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