Connect to Oracle database using connection pool under Tomcat server
- 2021-10-25 00:08:17
- OfStack
The following describes the operation of using connection pool to connect to the database under Tomcat server
1: Modify the web. xml file:
Insert between web-app < resource-ref > This code. Specifies the Resource name to use.
2: Modify the context. xml file under tomcat:
Add the following code between Context tags.
3: Select the database driver for Oracle and add it to the lib package for Tomcat. In this project: Ojdbc14. jar.
4: Provide 1 jsp page:
Start Tomcat so that you can access the page.
1: Modify the web. xml file:
<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd" id="WebApp_ID" version="3.0">
<display-name>project</display-name>
<welcome-file-list>
<welcome-file>index.html</welcome-file>
<welcome-file>index.htm</welcome-file>
<welcome-file>index.jsp</welcome-file>
<welcome-file>default.html</welcome-file>
<welcome-file>default.htm</welcome-file>
<welcome-file>default.jsp</welcome-file>
</welcome-file-list>
<resource-ref>
<description>DBConnection</description>
<res-ref-name>siniteksirm</res-ref-name>
<res-type>javax.sql.DataSource</res-type>
<res-auth>Container</res-auth>
</resource-ref>
</web-app>
Insert between web-app < resource-ref > This code. Specifies the Resource name to use.
2: Modify the context. xml file under tomcat:
Add the following code between Context tags.
<Resource name="siniteksirm" auth="Container"
type="javax.sql.DataSource"
driverClassName="oracle.jdbc.OracleDriver"
url="jdbc:oracle:thin:@192.168.1.196:1521:orcl"
username="paxt"
password="paxt"
maxActive="20"
maxIdle="10"
maxWait="-1"
testOnBorrow="true"
validationQuery="select 1 from dual"/>
3: Select the database driver for Oracle and add it to the lib package for Tomcat. In this project: Ojdbc14. jar.
4: Provide 1 jsp page:
<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%>
<%@ page import="javax.naming.Context" %>
<%@ page import="javax.naming.InitialContext" %>
<%@ page import="java.sql.*" %>
<%@ page import="javax.sql.DataSource" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert title here</title>
</head>
<body>
<%
DataSource ds = null;
try{
Context context = new InitialContext();
ds = (DataSource)context.lookup("java:comp/env/siniteksirm");
Connection conn = ds.getConnection();
PreparedStatement pst = conn.prepareStatement("select * from sdc_fundbase where rownum <= 2");
ResultSet rs = pst.executeQuery();
while(rs.next()){
out.println(rs.getString("fund4"));
out.println("<br/>");
}
if(ds != null){
out.println(" Database connection ");
}
}catch(Exception e){
e.printStackTrace();
out.println(" Database connection failed ");
}
%>
</body>
</html>
Start Tomcat so that you can access the page.