2015-01-21 00:51:22 +08:00
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/* Copyright (c) 2015, 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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* webapp.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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2015-05-05 01:16:10 +08:00
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*
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2015-01-21 00:51:22 +08:00
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* This displays a table of employees in the specified department.
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2015-05-05 01:16:10 +08:00
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*
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2015-01-21 00:51:22 +08:00
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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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2015-05-05 01:16:10 +08:00
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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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2015-01-21 00:51:22 +08:00
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*
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*****************************************************************************/
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var http = require('http');
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var url = require('url');
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var oracledb = require('oracledb');
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var dbConfig = require('./dbconfig.js');
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var portid = 7000; // HTTP listening port number
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// Main entry point. Creates a connection pool, on callback creates an
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// HTTP server and executes a query based on the URL parameter given
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// The pool values are arbitrary for the sake of showing how to set the properties.
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oracledb.createPool (
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{
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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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poolMax : 44,
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poolMin : 2,
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poolIncrement : 5,
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poolTimeout : 4
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},
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function(err, pool)
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{
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if (err) {
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2015-05-05 01:16:10 +08:00
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console.error("createPool() callback: " + err.message);
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2015-01-21 00:51:22 +08:00
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return;
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}
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// Create HTTP server and listen on port - portid
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hs = http.createServer (
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2015-05-05 01:16:10 +08:00
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function(request, response) // Callback gets HTTP request & response object
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2015-01-21 00:51:22 +08:00
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{
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2015-05-05 01:16:10 +08:00
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var urlparts = request.url.split("/");
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2015-01-21 00:51:22 +08:00
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var deptid = urlparts[1];
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2015-05-05 01:16:10 +08:00
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htmlHeader(response,
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"Oracle Database Driver for Node.js" ,
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"Example using node-oracledb driver");
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2015-01-21 00:51:22 +08:00
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if (deptid != parseInt(deptid)) {
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2015-05-05 01:16:10 +08:00
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handleError(response, 'URL path "' + deptid +
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'" is not an integer. Try http://localhost:' + portid + '/30', null);
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2015-01-21 00:51:22 +08:00
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return;
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}
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// Checkout a connection from the pool
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pool.getConnection (
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function(err, connection)
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{
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if (err) {
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2015-05-05 01:16:10 +08:00
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handleError(response, "getConnection() failed ", err);
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2015-01-21 00:51:22 +08:00
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return;
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}
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2015-05-05 01:16:10 +08:00
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// console.log("Connections open: " + pool.connectionsOpen);
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// console.log("Connections in use: " + pool.connectionsInUse);
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2015-01-21 00:51:22 +08:00
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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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function(err, result)
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{
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if (err) {
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2015-05-05 01:16:10 +08:00
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connection.release(
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function(err)
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{
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if (err) {
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handleError(response, "execute() error release() callback", err);
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return;
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}
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});
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handleError(response, "execute() callback", err);
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2015-01-21 00:51:22 +08:00
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return;
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}
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2015-05-05 01:16:10 +08:00
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displayResults(response, result, deptid);
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2015-01-21 00:51:22 +08:00
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/* Release the connection back to the connection pool */
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connection.release(
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function(err)
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{
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if (err) {
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2015-05-05 01:16:10 +08:00
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handleError(response, "normal release() callback", err);
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2015-01-21 00:51:22 +08:00
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return;
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}
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});
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2015-05-05 01:16:10 +08:00
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htmlFooter(response);
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2015-01-21 00:51:22 +08:00
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});
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});
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});
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hs.listen(portid, "localhost");
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2015-03-11 04:39:05 +08:00
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console.log("Server running at http://localhost:" + portid);
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2015-01-21 00:51:22 +08:00
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});
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2015-05-05 01:16:10 +08:00
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// Report an error
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function handleError(response, text, err)
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2015-01-21 00:51:22 +08:00
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{
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2015-05-05 01:16:10 +08:00
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if (err) {
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2015-05-27 05:40:40 +08:00
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text += err.message
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2015-05-05 01:16:10 +08:00
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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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htmlFooter(response);
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2015-01-21 00:51:22 +08:00
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}
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2015-05-05 01:16:10 +08:00
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// Display query results
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function displayResults(response, result, deptid)
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2015-01-21 00:51:22 +08:00
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{
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2015-05-05 01:16:10 +08:00
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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 (col = 0; col < result.metaData.length; col++) {
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response.write("<td>" + result.metaData[col].name + "</td>");
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}
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response.write("</tr>");
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// Rows
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for (row = 0; row < result.rows.length; row++) {
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response.write("<tr>");
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for (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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2015-01-21 00:51:22 +08:00
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}
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2015-05-05 01:16:10 +08:00
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// Prepare HTML header
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function htmlHeader(response, title, caption)
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2015-01-21 00:51:22 +08:00
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{
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2015-05-05 01:16:10 +08:00
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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 {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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2015-01-21 00:51:22 +08:00
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}
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2015-05-05 01:16:10 +08:00
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// Prepare HTML footer
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function htmlFooter(response)
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2015-01-21 00:51:22 +08:00
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{
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2015-05-05 01:16:10 +08:00
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response.write("</body>\n</html>");
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response.end();
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2015-01-21 00:51:22 +08:00
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}
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