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Examples initial import.

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Erik C. Thauvin 2004-03-20 13:36:08 +00:00
parent ed19117078
commit 6ed79c0387
18 changed files with 1653 additions and 8 deletions
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<!DOCTYPE html PUBLIC "-//Tigris//DTD XHTML 1.0 Transitional//EN"
"http://style.tigris.org/tigris_transitional.dtd">
<%@page import="javax.naming.*" %>
<html>
<head>
<style type="text/css">
/* <![CDATA[ */
@import "../includes/tigris.css";
@import "../includes/inst.css";
/* ]]> */
</style>
<title>simplepool: Servlet DataSource Examples</title>
<meta http-equiv="Content-Type" content="text/html;charset=UTF-8" />
<meta http-equiv="Content-Style-Type" content="text/css" />
<script language="javascript" type="text/javascript">
<% boolean enabled = (pageContext.findAttribute("ServletPoolDS") != null); %>
function RTFM()
{
alert("Please read the instructions to enable this example.");
}
</script>
</head>
<body marginwidth="0" marginheight="0" class="composite">
<table border="0" cellspacing="0" cellpadding="4" width="100%" id="main">
<tr valign="top">
<td>
<div id="bodycol">
<div id="apphead">
<h2><small>simplepool</small><br />
Servlet DataSource Examples</h2>
</div>
<p class="tasknav"><a href="../index.html">Examples Home</a></p>
<p><strong>Please read the instructions before trying to run the examples.</strong></p>
<div id="examples" class="app">
<div class="axial">
<table border="0" cellspacing="2" cellpadding="3">
<tr>
<th>Summary</th>
<td>A simple database connection pool example using the SimplePool Servlet.</td>
</tr>
<tr>
<th>Example 1</th>
<td><a href="<% if (enabled) { %>scriptlet.jsp<% } else { %>javascript:RTFM()<% } %>">Scriptlet Example</a> [<a href="../source.jsp?file=servlet/scriptlet.jsp">source</a>]</td>
</tr>
<tr>
<th>Example 2</th>
<td><a href="<% if (enabled) { %>jstl.jsp<% } else { %>javascript:RTFM()<% } %>">JSTL Example</a> [<a href="../source.jsp?file=servlet/jstl.jsp">source</a>]</td>
</tr>
</table>
</div>
<div class="h3" id="instructions">
<h3>Instructions</h3>
<p>The SimplePoolServlet is used to create, access and manage the connection pool.</p>
<p class="alert">First, make sure that your JDBC driver is available, by placing its components in this webapp's WEB-INF/lib/ directory.</p>
<p>The SimplePoolServlet is configured using a set of required initialization parameters, as show in this webapp's <code><a href="../source.jsp?file=WEB-INF/web.xml">WEB-INF/web.xml</a></code> under the <code>&lt;servlet/&gt;</code> section:</p>
<ul>
<li>The <code class="info">varName</code> initialization parameter is used to specify the name of the variable which will hold a reference to the DataSource object created by the Servlet.</li>
<li>The <code class="info">driver</code> initialization parameter is used to specify the name of the JDBC driver class to be registered. For <code>example: com.mysql.jdbc.Driver</code>.</li>
<li>The <span class="info">user</span> initialization parameter is used to specify the database username, if any.</li>
<li>The <code class="info">password</code> initialization parameter is used to specify the database password, if any.</li>
<li>The <code class="info">jdbcUrl</code> initialization parameter is used to specify the JDBC URL associated with the database. For example: <code>jdbc:mysql://localhost:3306/dbname</code>.</li>
<li>The <code class="info">minConns</code> initialization parameter is used to specify the minimum number of connections to start the pool with.</li>
<li>The <code class="info">maxConns</code> initialization parameter is used to specify the maximum number of connections to be dynamically created in the pool.</li>
<li>The <code class="info">maxConnTime</code> initialization parameter is used to specify the time (in days) between connection resets. The pool manager will perform a basic cleanup at the specified interval.</li>
<li>The <code class="info">maxCheckoutSeconds</code> initialization parameter is used to specify the maximum time a connection can be checked out before being recycled. A zero value turns this option off.</li>
</ul>
<p>Please note that <em>all parameters are required</em>.</p>
<p class="alert">Please take a minute to uncomment the <code>&lt;servlet/&gt;</code> declaration and configure the Servlet's initialization parameters in this webapp's <code>WEB-INF/web.xml</code>. Once done, please restart the webapp and/or Tomcat. The examples will be functional upon restart.</p>
<p>Please look at the [source] of the provided examples to understand how to access the connection pool from a scriptlet or using the JSTL SQL tags. The examples demonstrates how to list all of the tables contained in the specified database.</p>
</div>
</div>
</div>
</td>
</tr>
</table>
</body>
</html>

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<%@ taglib prefix="c" uri="http://java.sun.com/jstl/core" %>
<%@ taglib prefix="sql" uri="http://java.sun.com/jstl/sql" %>
<html>
<head>
<title>SimplePool Servlet/JSTL Example</title>
</head>
<body>
<%-- Execute the query using our DataSource --%>
<sql:query var="rs" dataSource="${ServletPoolDS}">
SHOW TABLES
</sql:query>
<h3>Tables</h3>
<ul>
<%--
Loop through the result set and
display the current column value
--%>
<c:forEach var="row" items="${rs.rowsByIndex}">
<li><c:out value="${row[0]}"/></li>
</c:forEach>
<ul>
</body>
</html>

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<%@page import="javax.naming.*, javax.sql.*, java.sql.*;" %>
<html>
<head>
<title>SimplePool Servlet Example</title>
</head>
<body>
<%
// Get a reference to our DataSource
DataSource ds = (DataSource) pageContext.findAttribute("ServletPoolDS");
// Get a connection from the pool
Connection conn = ds.getConnection();
// Create a new statement
Statement stmt = conn.createStatement();
// Execute the query
ResultSet rst = stmt.executeQuery("SHOW TABLES");
%>
<h3>Tables</h3>
<ul>
<%
// Loop through the result set and
// display the current column value
while (rst.next()) {
%>
<li><%= rst.getString(1) %></li>
<%
}
%>
<ul>
<%
// Close the result set, statement and connection
// and display the current column value
rst.close();
stmt.close();
conn.close();
%>
</body>
</html>