217 lines
7.0 KiB
JavaScript
217 lines
7.0 KiB
JavaScript
/* Copyright (c) 2015, 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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* webappawait.js
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*
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* DESCRIPTION
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* Shows a web based query using connections from connection pool.
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*
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* This displays a table of employees in the specified department.
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*
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* The script creates an HTTP server listening on port 7000 and
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* accepts a URL parameter for the department ID, for example:
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* http://localhost:7000/90
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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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* Uses Oracle's sample HR schema. Scripts to create the HR schema
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* can be found at: https://github.com/oracle/db-sample-schemas
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*
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* This example requires node-oracledb 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 http = require('http');
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const oracledb = require('oracledb');
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const dbConfig = require('./dbconfig.js');
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const httpPort = 7000;
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// Main entry point. Creates a connection pool and an HTTP server
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// that executes a query based on the URL parameter given.
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// The pool values shown are the default values.
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async function init() {
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try {
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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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// Create HTTP server and listen on port httpPort
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const server = http.createServer();
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server.on('error', (err) => {
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console.log('HTTP server problem: ' + err);
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});
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server.on('request', (request, response) => {
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handleRequest(request, response);
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});
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await server.listen(httpPort);
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console.log("Server running at http://localhost:" + httpPort);
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} catch (err) {
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console.error("init() error: " + err.message);
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}
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}
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async function handleRequest(request, response) {
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const urlparts = request.url.split("/");
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const deptid = urlparts[1];
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htmlHeader(
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response,
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"Oracle Database Driver for Node.js",
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"Example using node-oracledb driver"
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);
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if (deptid == 'favicon.ico') {
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htmlFooter(response);
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return;
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}
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if (deptid != parseInt(deptid)) {
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handleError(
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response,
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'URL path "' + deptid + '" is not an integer. Try http://localhost:' + httpPort + '/30',
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null
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);
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return;
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}
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let connection;
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try {
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// Checkout a connection from the default pool
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connection = await oracledb.getConnection();
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const result = await connection.execute(
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`SELECT employee_id, first_name, last_name
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FROM employees
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WHERE department_id = :id`,
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[deptid] // bind variable value
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);
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displayResults(response, result, deptid);
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} catch (err) {
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handleError(response, "handleRequest() error", err);
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} finally {
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if (connection) {
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try {
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// Release the connection back to the connection 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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htmlFooter(response);
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}
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// Report an error
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function handleError(response, text, err) {
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if (err) {
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text += ": " + err.message;
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}
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console.error(text);
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response.write("<p>Error: " + text + "</p>");
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}
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// Display query results
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function displayResults(response, result, deptid) {
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response.write("<h2>" + "Employees in Department " + deptid + "</h2>");
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response.write("<table>");
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// Column Title
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response.write("<tr>");
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for (let col = 0; col < result.metaData.length; col++) {
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response.write("<th>" + result.metaData[col].name + "</th>");
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}
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response.write("</tr>");
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// Rows
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for (let row = 0; row < result.rows.length; row++) {
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response.write("<tr>");
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for (let col = 0; col < result.rows[row].length; col++) {
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response.write("<td>" + result.rows[row][col] + "</td>");
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}
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response.write("</tr>");
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}
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response.write("</table>");
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}
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// Prepare HTML header
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function htmlHeader(response, title, caption) {
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response.writeHead(200, {"Content-Type": "text/html"});
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response.write("<!DOCTYPE html>");
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response.write("<html>");
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response.write("<head>");
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response.write("<style>" +
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"body {background:#FFFFFF;color:#000000;font-family:Arial,sans-serif;margin:40px;padding:10px;font-size:12px;text-align:center;}" +
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"h1 {margin:0px;margin-bottom:12px;background:#FF0000;text-align:center;color:#FFFFFF;font-size:28px;}" +
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"table {border-collapse: collapse; margin-left:auto; margin-right:auto;}" +
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"td, th {padding:8px;border-style:solid}" +
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"</style>\n");
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response.write("<title>" + caption + "</title>");
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response.write("</head>");
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response.write("<body>");
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response.write("<h1>" + title + "</h1>");
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}
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// Prepare HTML footer
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function htmlFooter(response) {
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response.write("</body>\n</html>");
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response.end();
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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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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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