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Updating database using servlet

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To render the HTML form, the servlet delegates to as follows: (ending in slash) represents a collection of books, while /book (no slash) represents a single book (using REST style URL).

If we did a forward, then after the form submission the browser would show the listing, but under the URI /book instead of /book/.

On running, this page shows new form like this: And on editing mode: We’ll see how to connect the DAO class with the JSP pages based on user’s requests in the next section: creating the servlet class. It’s time to deploy and test the application to see how it works.

Now, the most difficult but interesting part is implement a Java Servlet that acts as a page controller to handle all requests from the client. Follow this tutorial in case you don’t know how to add Apache Tomcat server in Eclipse.

These CRUD operations are equivalent to the INSERT, SELECT, UPDATE and DELETE statements in SQL language. Connection Utils; import org.o7planning.simplewebapp.utils. My Utils; @Web Filter(filter Name = "jdbc Filter", url Patterns = ) public class JDBCFilter implements Filter In case, the user logined and remembered information in previous access (for example the day before). Http Session; import org.o7planning.simplewebapp.beans. User Account; import org.o7planning.simplewebapp.utils. Change the code that looks like this in book-list.jsp: method uses the id being empty or not to determine if this is a load "Add Employee Form" or load "Update Employee Form" operation. The do Get method also converts the date into a format that is easy for the end user to modify and it also maps the book into request scope as follows: In the model 2 architecture, the Servlet tier prepares the form data before a form loads to be rendered and edited correctly. Application Scoped; @Application Scoped public class Book Repository Impl implements Book Repository package com.bookstore.web; import Servlet Exception; import javax.servlet.annotation. If the ender user linked to /book, it would not take them back to the listing but back to a form, which not correct. We have created the following files for this bookstore example: $ find . ./Web Content/WEB-INF/pages/Book Form ./Web Content/WEB-INF/pages/Book Listing ./src/META-INF/Needed for Java EE dependency injection (CDI) ./src/com/bookstore/Domain/model object ./src/com/bookstore/Book Repository Repository implementation using Java collections (just for testing) ./src/com/bookstore/Book Interface to Book Repository so we can swap it out with JDBC, JPA, JCache and Mongo DB version later ./src/com/bookstore/web/Book Editor Servlet that loads Book (do Get) form and handles Book form submissions (do Post). This is why we do a send Redirect instead of a forward. It is everything you could want from a CRUD listing. ./src/com/bookstore/web/Book List Servlet that looks up a list of books and displays the listing package com.bookstore; import create database Sample DB; use Sample DB; CREATE TABLE `users` ( `user_id` int(11) NOT NULL AUTO_INCREMENT, `username` varchar(45) NOT NULL, `password` varchar(45) NOT NULL, `fullname` varchar(45) NOT NULL, `email` varchar(45) NOT NULL, PRIMARY KEY (`user_id`) ); Practical Database Programming with Java - This book is for those who are beginner in Java database programming and want to catch up with the main database programming techniques with straightforward and easy to learn example code. This method returns an update count indicating how many rows in the table were affected by the query, so checking this return value is necessary to ensure the query was executed successfully.String sql = "INSERT INTO Users (username, password, fullname, email) VALUES (? In this case, method should return 1 to indicate one record was inserted.