128 lines
3.6 KiB
JavaScript
128 lines
3.6 KiB
JavaScript
/* Copyright (c) 2016, 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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* 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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* Create clobexample.txt before running this example.
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* Use demo.sql to create the required schema.
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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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var fs = require('fs');
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var oracledb = require('oracledb');
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var dbConfig = require('./dbconfig.js');
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var 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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// Cleanup anything other than lobinsert1.js demonstration data
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await connection.execute(`DELETE FROM mylobs WHERE id > 2`);
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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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let errorHandled = false;
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tempLob.on('close', () => {
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// console.log("templob.on 'close' event");
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});
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tempLob.on('error', (err) => {
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// console.log("templob.on 'error' event");
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if (!errorHandled) {
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errorHandled = true;
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reject(err);
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}
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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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if (!errorHandled) {
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resolve();
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}
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});
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console.log('Reading from ' + inFileName);
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var 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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if (!errorHandled) {
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errorHandled = true;
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reject(err);
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}
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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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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 close LOBs that were created using createLob()
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await tempLob.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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