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>