DataBase Connectivity
Akankshaji
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21 slides
Nov 29, 2010
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Database Accessing from JSP Page Presented by: Akanksha Shukla
Introduction JSP pages Markup Scriptlets Example Accessing Database From JSP Page Steps to access database Example Description References Outline 2
Java Server Pages ( JSP ) is a Java technology that helps software developers serve dynamically generated web pages based on HTML, XML, or other document types. JSP pages are loaded in the server and operated from a structured special installed Java server packet called a Java EE Web Application, often packaged as a .war or .ear file archive. JSP allows Java code and certain pre-defined actions to be interleaved with static web markup content, with the resulting page being compiled and executed on the server to deliver an HTML or XML document. . Introduction… 3
Introduction… 4 JSP allows Java code and certain pre-defined actions to be interleaved with static web markup content, with the resulting page being compiled and executed on the server to deliver an HTML or XML document. JSP syntax is a fluid mix of two basic content forms: 1. Scriptlet Elements 2. Markup
Markup is typically standard HTML or XML. When the page is requested, the Java code is executed and its output is added with the surrounding markup to create the final page. Because Java is a compiled language, not a scripting language, JSP pages must be compiled to Java bytecode classes before they can be executed, but such compilation is needed only when a change to the source JSP file has occurred. Markup 5
Scriptlet elements are delimited blocks of Java code which may be intermixed with the markup. Java code is not required to be complete (self contained) within its scriptlet element block, but can straddle markup content providing the page as a whole is syntactically correct (for example, any Java if/for/while blocks opened in one scriptlet element must be correctly closed in a later element for the page to successfully compile). Scriptlets 6
7 Handling of JSP Page Request JSP Engine and Web Server JSP file Component Client Response Request Request Response Response Fig: Data Passed b/w Client & Server
<%-- use the ' taglib ' directive to make the JSTL 1.0 core tags available; use the uri "http://java.sun.com/jsp/jstl/core" for JSTL 1.1 --%> <%@ taglib uri ="http://java.sun.com/jstl/core" prefix="c" %> <%-- use the ' jsp:useBean ' standard action to create the Date object; the object is set as an attribute in page scope --%> < jsp:useBean id="date" class=" java.util.Date " /> <html> <head><title>First JSP</title></head> <body> <h2>Here is today's date</h2> <c:out value="${date}" /> </body> </html> Example 8
Accessing DB From JSP Page 9 While accessing JSP database from JSP page, we should have some database package installed. Here we consider the connectivity from MYSQL database with JSP. Assumptions: TOMCAT web server is installed. MYSQL server is installed. JDK is installed .
Various steps are: 1. Create a database named “books”, statement is: MYSQL>CREATE DATABASE books ; 2. Create a table named “books_details”, statement is: MYSQL>CREATE TABLE books_details ( `id` INT( 11 ) NOT NULL AUTO_INCREMENT , `book_name` VARCHAR( 100 ) NOT NULL , `author` VARCHAR( 100 ) NOT NULL , PRIMARY KEY ( `id` ) ) Steps to access Database 10
Steps to access Database 11 The table is: ID Book Name Author 1. Java I/O Tim Ritchey 2. Java & XML, 2 Edition Brett McLaughlin 3. Java Swing, 2nd Edition Dave Wood, Marc Loy,
3. Copy the MYSQL-connector-java-3.1.14-bin.jar to the C:\tomcat_directory\common\lib . Then set the Classpath . For that, we have to perform the following: Control Panel->System-> System Properties-> Environmental Variables and set Classpath . Steps to access Database 12
Steps to access Database 13 4. After setting Classpath , restart the Tomcat Web Server using the startup.bat file at the command promt . Create a folder DBDemo using following line: C:\tomcat_directory\jsp-examples\DBDemo and now write the JSP program which is used to connect the database.
Example 14 <%@ page language="java" import="java.sql.*" %> <% Connection con=null; ResultSet rst =null; Statement stmt=null; String driver = " org.gjt.mm.mysql.Driver "; Class.forName (driver). newInstance (); Classes & interfaces object instantiation
try { String url = " jdbc:mysql :// localhost / books?user = <user>&password=<password>"; con= DriverManager.getConnection ( url ); stmt= con.createStatement (); } catch(Exception e) { System.out.println ( e.getMessage ()); } Example 15
16 Example if( request.getParameter ("action") != null) { String book= request.getParameter (" bookname "); String author= request.getParameter ("author"); stmt.executeUpdate ("insert into books_details ( book_name , author) values('"+ bookname +"','"+author+"')"); rst = stmt.executeQuery ("select * from books_details "); %> Retrieve fields
while( rst.next ()) {%> < tr ><td><%=no%></td> <td><%= rst.getString (“ book_name ")%> </td> <td> <%= rst.getString ("author“)%> </td> </ tr > <%no++; } rst.close (); stmt.close (); con.close (); %> Example 17
1. JSP is a kind of scripting language in which we can embed JAVA code along with HTML elements. 2. Above code of JDBC and jsp shows how we can manipulate data in a relational database from JSP page. We need to use the java.sql package: DriverManager , Connection, Statement, and ResultSet . To create a Web application, we need JDBC to use more features such as prepared statements and connection pooling. 18 Conclusion
Figures- http://www.google.co.in “Web Technology” by A.A.Puntambekar http://www.wikipedia.org References… 19
Queries??? For more details please mail to: [email protected] 20
Thanking to you all...... 21
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