147 lines
4.7 KiB
JavaScript
147 lines
4.7 KiB
JavaScript
/* Copyright (c) 2016, 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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* lobtempplsql.js
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*
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* DESCRIPTION
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* Creates a 'temporary CLOB', streams data into it from clobexample.txt, and
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* then passes it into a PL/SQL procedure to insert into the database.
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*
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* Smaller amounts of data can be passed directly to PL/SQL without
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* needed a temporary LOB. See lobbinds.js
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*
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* This example requires node-oracledb 1.12.1 or later.
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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 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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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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connection = await oracledb.getConnection(dbConfig);
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await demoSetup.setupLobs(connection); // create the demo table
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// Create an empty Temporary Lob
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const tempLob = await connection.createLob(oracledb.CLOB);
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// Helper function for loading data to the Temporary Lob
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const doStream = new Promise((resolve, reject) => {
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// Note: there is no 'close' event to destroy templob because it is needed
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// for the INSERT
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tempLob.on('error', (err) => {
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// console.log("templob.on 'error' event");
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reject(err);
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});
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tempLob.on('finish', () => {
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// console.log("templob.on 'finish' event");
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// The data was loaded into the temporary LOB
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resolve();
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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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tempLob.destroy(err);
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});
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inStream.pipe(tempLob); // copies the text to the temporary LOB
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});
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// Load the data into the Temporary LOB
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await doStream;
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// Call PL/SQL to insert into the DB
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console.log('Calling PL/SQL to insert the temporary LOB into the database');
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await connection.execute(
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`BEGIN
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no_lobs_in(:id, :c, null);
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END;`,
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{
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id: 3,
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c: tempLob // type and direction are optional for IN binds
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},
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{ autoCommit: true }
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);
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console.log("Call completed");
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// Applications should destroy LOBs that were created using createLob().
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tempLob.destroy();
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// Wait for destroy() to emit the the close event. This means the lob will
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// be cleanly closed before the app closes the connection, otherwise a race
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// will occur.
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await new Promise((resolve, reject) => {
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tempLob.on('error', reject);
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tempLob.on('close', resolve);
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});
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} catch (err) {
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// Note: in this example the stream is not explicitly destroyed on error.
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// This is left to the connection close to initiate.
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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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