1. Database configuration
Create a new test user, a new database and a single test table. Your MySQL user must have a password assigned. The driver will fail if you try to connect with an empty password.
GRANT ALL PRIVILEGES ON *.* TO javauser@localhost
IDENTIFIED BY ‘javadude‘ WITH GRANT OPTION;
CREATE DATABASE javatest;
USE javatest;
CREATE TABLE testdata (
id INT NOT NULL AUTO_INCREMENT PRIMARY KEY,
foo VARCHAR(25),
bar INT
);
INSERT INTO testdata VALUES(NULL, ‘hello‘, 12345);
2. Context configuration
Configure the JNDI DataSource in Tomcat by adding a declaration for your resource to your Context.
<Resource name="jdbc/TestDB" auth="Container" type="javax.sql.DataSource"
maxActive="100" maxIdle="30" maxWait="10000"
username="javauser" password="javadude" driverClassName="com.mysql.jdbc.Driver"
url="jdbc:mysql://localhost:3306/javatest"/>
3. web.xml configuration
Now create a WEB-INF/web.xml for this test application.
<?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.5" xmlns="http://java.sun.com/xml/ns/javaee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/javaee
http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">
<resource-ref>
<description>DB Connection</description>
<res-ref-name>jdbc/TestDB</res-ref-name>
<res-type>javax.sql.DataSource</res-type>
<res-auth>Container</res-auth>
</resource-ref>
</web-app>
4. Test code
Now create a simple test.jsp page for use later.
<%@ taglib uri="http://java.sun.com/jsp/jstl/sql" prefix="sql"%>
<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"%>
<sql:query var="rs" dataSource="jdbc/TestDB">
select id, foo, bar from testdata
</sql:query>
<html>
<head>
<title>DB Test</title>
</head>
<body>
<h2>Results</h2>
<c:forEach var="row" items="${rs.rows}">
Foo ${row.foo}<br />
Bar ${row.bar}<br />
</c:forEach>
</body>
</html>
时间： 2024-10-13 06:23:31