127 lines
3.7 KiB
JavaScript
127 lines
3.7 KiB
JavaScript
/* Copyright (c) 2018, 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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* cqn1.js
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*
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* DESCRIPTION
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* Shows query-level Continuous Query Notification, allowing a
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* method to be invoked when a data set changes.
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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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* Run this script and when the subscription has been created, run
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* these statements in a SQL*Plus session:
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* INSERT INTO CQNTABLE VALUES (101);
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* COMMIT;
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*
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* This example requires node-oracledb 2.3 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 oracledb = require("oracledb");
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const dbConfig = require('./dbconfig.js');
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dbConfig.events = true; // CQN needs events mode
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const 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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console.log("Message queries:");
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for (let i = 0; i < message.queries.length; i++) {
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const query = message.queries[i];
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for (let j = 0; j < query.tables.length; j++) {
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const table = query.tables[j];
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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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console.log("--> --> Table Rows:");
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for (let k = 0; k < table.rows.length; k++) {
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const row = table.rows[k];
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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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}
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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 WHERE k > :bv",
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binds: { bv : 100 },
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timeout : 60, // Stop after 60 seconds
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// SUBSCR_QOS_QUERY: generate notifications when rows with k > 100 are changed
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// SUBSCR_QOS_ROWIDS: Return ROWIDs in the notification message
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qos : oracledb.SUBSCR_QOS_QUERY | oracledb.SUBSCR_QOS_ROWIDS
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};
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async function runTest() {
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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 connection.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 (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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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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