117 lines
4.2 KiB
JavaScript
117 lines
4.2 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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* connectionpool.js
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*
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* DESCRIPTION
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* Shows connection pool usage. Connection pools are recommended
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* for applications that use a lot of connections for short periods.
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*
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* Other connection pool examples are in sessionfixup.js and webappawait.js.
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* For a standalone connection example, see connect.js
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*
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* In some networks forced pool termination may hang unless you have
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* 'disable_oob=on' in sqlnet.ora, see
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* https://oracle.github.io/node-oracledb/doc/api.html#tnsadmin
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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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async function init() {
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try {
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// Create a connection pool which will later be accessed via the
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// pool cache as the 'default' pool.
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await oracledb.createPool({
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user: dbConfig.user,
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password: dbConfig.password,
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connectString: dbConfig.connectString
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// edition: 'ORA$BASE', // used for Edition Based Redefintion
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// events: true, // whether to handle Oracle Database FAN and RLB events or support CQN
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// externalAuth: false, // whether connections should be established using External Authentication
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// homogeneous: true, // all connections in the pool have the same credentials
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// poolAlias: 'default', // set an alias to allow access to the pool via a name.
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// poolIncrement: 1, // only grow the pool by one connection at a time
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// poolMax: 4, // maximum size of the pool. Increase UV_THREADPOOL_SIZE if you increase poolMax
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// poolMin: 0, // start with no connections; let the pool shrink completely
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// poolPingInterval: 60, // check aliveness of connection if idle in the pool for 60 seconds
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// poolTimeout: 60, // terminate connections that are idle in the pool for 60 seconds
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// queueTimeout: 60000, // terminate getConnection() calls in the queue longer than 60000 milliseconds
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// sessionCallback: myFunction, // function invoked for brand new connections or by a connection tag mismatch
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// stmtCacheSize: 30 // number of statements that are cached in the statement cache of each connection
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});
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console.log('Connection pool started');
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// Now the pool is running, it can be used
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await dostuff();
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} catch (err) {
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console.error('init() error: ' + err.message);
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} finally {
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await closePoolAndExit();
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}
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}
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async function dostuff() {
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let connection;
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try {
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// Get a connection from the default pool
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connection = await oracledb.getConnection();
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const sql = `SELECT sysdate FROM dual WHERE :b = 1`;
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const binds = [1];
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const options = { outFormat: oracledb.OUT_FORMAT_OBJECT };
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const result = await connection.execute(sql, binds, options);
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console.log(result);
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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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// Put the connection back in the pool
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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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async function closePoolAndExit() {
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console.log('\nTerminating');
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try {
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// Get the pool from the pool cache and close it when no
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// connections are in use, or force it closed after 10 seconds
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// If this hangs, you may need DISABLE_OOB=ON in a sqlnet.ora file
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await oracledb.getPool().close(10);
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console.log('Pool closed');
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process.exit(0);
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} catch(err) {
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console.error(err.message);
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process.exit(1);
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}
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}
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process
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.once('SIGTERM', closePoolAndExit)
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.once('SIGINT', closePoolAndExit);
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init();
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