170 lines
6.9 KiB
JavaScript
170 lines
6.9 KiB
JavaScript
/* Copyright (c) 2018, 2023, 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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* 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 webapp.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://node-oracledb.readthedocs.io/en/latest/user_guide/connection_handling.html#limiting-the-time-taken-to-execute-statements
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*
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* In production applications, set poolMin=poolMax (and poolIncrement=0)
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*
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*****************************************************************************/
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'use strict';
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Error.stackTraceLimit = 50;
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// Note: if you use Thick mode, and you increase poolMax, then you must also
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// increase UV_THREADPOOL_SIZE before Node.js starts its thread pool. If you
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// set UV_THREADPOOL_SIZE too late, the value is ignored and the default size
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// of 4 is used.
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//
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// On Windows you must set the UV_THREADPOOL_SIZE environment variable
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// externally before running your application.
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//
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// Increasing UV_THREADPOOL_SIZE is not needed if you use Thin mode.
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//
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// process.env.UV_THREADPOOL_SIZE = 10; // set threadpool size to 10 for 10 connections
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const oracledb = require('oracledb');
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const dbConfig = require('./dbconfig.js');
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// This example runs in both node-oracledb Thin and Thick modes.
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//
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// Optionally run in node-oracledb Thick mode
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if (process.env.NODE_ORACLEDB_DRIVER_MODE === 'thick') {
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// Thick mode requires Oracle Client or Oracle Instant Client libraries.
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// On Windows and macOS Intel you can specify the directory containing the
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// libraries at runtime or before Node.js starts. On other platforms (where
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// Oracle libraries are available) the system library search path must always
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// include the Oracle library path before Node.js starts. If the search path
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// is not correct, you will get a DPI-1047 error. See the node-oracledb
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// installation documentation.
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let clientOpts = {};
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// On Windows and macOS Intel platforms, set the environment
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// variable NODE_ORACLEDB_CLIENT_LIB_DIR to the Oracle Client library path
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if (process.platform === 'win32' || (process.platform === 'darwin' && process.arch === 'x64')) {
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clientOpts = { libDir: process.env.NODE_ORACLEDB_CLIENT_LIB_DIR };
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}
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oracledb.initOracleClient(clientOpts); // enable node-oracledb Thick mode
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}
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console.log(oracledb.thin ? 'Running in thin mode' : 'Running in thick mode');
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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: false, // 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. (Note: Increase UV_THREADPOOL_SIZE if you increase poolMax in Thick mode)
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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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// queueMax: 500, // don't allow more than 500 unsatisfied getConnection() calls in the pool queue
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// queueTimeout: 60000, // terminate getConnection() calls queued for 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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// sodaMetaDataCache: false, // Set true to improve SODA collection access performance
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// stmtCacheSize: 30, // number of statements that are cached in the statement cache of each connection
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// enableStatistics: false // record pool usage for oracledb.getPool().getStatistics() and logStatistics()
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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 CURRENT_DATE 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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// oracledb.getPool().logStatistics(); // show pool statistics. pool.enableStatistics must be true
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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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// This setting should not be needed if both Oracle Client and Oracle
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// Database are 19c (or later).
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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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