120 lines
3.4 KiB
JavaScript
120 lines
3.4 KiB
JavaScript
/* Copyright (c) 2018, 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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* cqn2.js
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*
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* DESCRIPTION
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* Shows object-level Continuous Query Notification (formerly known
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* as Database Change Notification), allowing a method to be invoked
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* when an object changes. Notification are grouped into intervals.
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*
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* The user must have been granted CHANGE NOTIFICATION.
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* The node-oracledb host must be resolvable by the database host.
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*
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* This example uses Node 8 syntax, but could be written to use callbacks.
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*
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*****************************************************************************/
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const oracledb = require("oracledb");
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let dbConfig = require('./dbconfig.js');
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dbConfig.events = true; // CQN needs events mode
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let interval = setInterval(function() {
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console.log("waiting...");
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}, 5000);
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function myCallback(message)
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{
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// message.type is one of the oracledb.SUBSCR_EVENT_TYPE_* values
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console.log("Message type:", message.type);
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if (message.type == oracledb.SUBSCR_EVENT_TYPE_DEREG) {
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clearInterval(interval);
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console.log("Deregistration has taken place...");
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return;
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}
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console.log("Message database name:", message.dbName);
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console.log("Message transaction id:", message.txId);
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for (let i = 0; i < message.tables.length; i++) {
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let table = message.tables[i];
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console.log("--> Table Name:", table.name);
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// Note table.operation and row.operation are masks of
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// oracledb.CQN_OPCODE_* values
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console.log("--> Table Operation:", table.operation);
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if (table.rows) {
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for (let j = 0; j < table.rows.length; j++) {
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let row = table.rows[j];
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console.log("--> --> Row Rowid:", row.rowid);
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console.log("--> --> Row Operation:", row.operation);
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console.log(Array(61).join("-"));
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}
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}
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console.log(Array(61).join("="));
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}
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}
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const options = {
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callback : myCallback,
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sql: "SELECT * FROM cqntable",
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// Stop after 60 seconds
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timeout : 60,
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// Return ROWIDs in the notification message
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qos : oracledb.SUBSCR_QOS_ROWIDS,
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// Group notifications in batches covering 10 second
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// intervals, and send a summary
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groupingClass : oracledb.SUBSCR_GROUPING_CLASS_TIME,
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groupingValue : 10,
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groupingType : oracledb.SUBSCR_GROUPING_TYPE_SUMMARY
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};
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async function runTest() {
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let conn;
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try {
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conn = await oracledb.getConnection(dbConfig);
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await conn.subscribe('mysub', options);
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console.log("Subscription created...");
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} catch (err) {
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console.error(err);
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clearInterval(interval);
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} finally {
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if (conn) {
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try {
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await conn.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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process
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.on('SIGTERM', function() {
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console.log("\nTerminating");
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process.exit(0);
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})
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.on('SIGINT', function() {
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console.log("\nTerminating");
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process.exit(0);
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});
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runTest();
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