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Jsp project module

  1. 1. 3 tier Architecture - JSP Project Module 1
  2. 2. How to create a Web Project in Eclipse 2
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  11. 11. Tasks • Complete the classes with methods by dividing them into sub-tasks. Example: Module- Customer registration Classes-view, service, DB, Customer bean Methods- • saveDetails()-return value Customer id • fetchDetails(custID) - return Customer details object • Show the return customer id or error message in a page 11
  12. 12. Package Packages are nothing more than the way we organize files into different directories according to their functionality, usability as well as category they should belong to. 12
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  15. 15. Add a jsp page to WebContent for Registering an Employee 15
  16. 16. Creating a bean for passing employee details 16
  17. 17. Define required variables 17
  18. 18. Generating Getters and Setters 18
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  20. 20. Creating a Service layer 20
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  23. 23. • You have to import classes EmployeeBean, DB.AddEmployee since service layer deals with database layer and bean class. • Code for service layer is: import com.baabtra.bean.EmployeeBean; import com.baabtra.DB.AddEmployee; public class AddEmployeeService { public String registerEmployee(EmployeeBean emp) { AddEmployee register= new AddEmployee(); String returnmsg=register.registerEmployeeDB(emp); return returnmsg; } } 23
  24. 24. Presentation layer • Post data to page register.jsp • Import required classes to register.jsp <%@ page import="com.Pharma.bean.EmployeeBean"%> <%@ page import="com.Pharma.Service.AddEmployeeService"%> • Store data in variables <% String employee_id =request.getParameter("employee_id"); System.out.println("Employee Id :"+employee_id); String employee_name =request.getParameter("employee_name"); String user_name =request.getParameter("user_name"); String employee_password =request.getParameter("employee_password"); String address =request.getParameter("address"); String gender=request.getParameter("gender"); String dob =(String)request.getParameter("txt_dob"); %> 24
  25. 25. • Create object form employee bean and set values for its properties <% EmployeeBean emp=new EmployeeBean(); emp.setEmpId(employee_id); emp.setEmpName(employee_name); emp.setUserName(user_name); emp.setPaassword(employee_password); emp.setAddress(address); emp.setGender(gender); emp.setDob(dob1); emp.setDoj(doj1); %> 25
  26. 26. • Create object for service class and call the method for registering the employee <% AddEmployeeService add= new AddEmployeeService(); String result= add.registerEmployee(emp); %> • Check the result and do the necessary action if (result.equals("Success")){. //Redirect to page for success response.sendRedirect("Employee.jsp"); } else{ out.println("Data not saved"); } %> 26
  27. 27. Task-How to connect to DB? 27
  28. 28. JDBC • The JDBC (Java Database Connectivity) API helps a Java program to access a database in a standard way • JDBC is a specification that specifies two things 1. tells the database vendors how to write a driver program to interface Java programs with their database 2. tells the programmers how to write a Java program to access any database • A Driver written according to this standard is called the JDBC Driver • All related classes and interfaces are present in the java.sql package 28
  29. 29. • The steps involved in a database interaction are: – Loading the specific driver(there are different drivers for different DB) – Making a connection to the database using the predefined methods in the java.sql package – Sending and executing SQL statements to the database – Processing the results 29
  30. 30. Step1: Load the database Driver • Load the driver class by calling Class.forName() with the Driver class name as an argument. • Once loaded, the Driver class creates an instance of itself in the memory from which it is then used • The General format is : Class.forName( String ClassName ); • Example : Class.forName ("com.mysql.jdbc.Driver"); 30
  31. 31. Step2: Setting Connection using Driver Manager class – Driver Manager Manages all the JDBC Drivers that are loaded in the memory – Its getConnection() method is used to establish a connection to a database. – It uses a username, password, and a jdbc url to establish a connection to the database and returns a connection object. Connection connection =DriverManager.getConnection (url , username, password); 31
  32. 32. Connection conn =null; String username = "root"; String password = ""; String url = "jdbc:mysql://localhost/project"; Class.forName ("com.mysql.jdbc.Driver"); conn = DriverManager.getConnection (url, userName, password); DB ip address Database name 32
  33. 33. Step3:Create a Statement object • After a connection is obtained we can interact with the database. • We use methods defined in Connection interface for interacting with the database via the established connection. • To execute SQL statements, we need to instantiate a Statement object from the connection object by using the createStatement() method. Statement statement = connection.createStatement(); • A statement object is used to send and execute SQL statements to a database. 33
  34. 34. Statement interface • Defines methods that are used to interact with database via the execution of SQL statements. • The different methods are: – executeQuery(String query) - executes an SQL statement (SELECT) that queries a database and returns a ResultSet object. – getResultSet() - used to retrieve the ResultSet object – executeUpdate(String query) - executes an SQL statement (INSERT ,UPDATE or DELETE) that updates the database and returns an integer value which specifies the number of rows modified – execute(String query) - executes an SQL statement that is written as String object 34
  35. 35. ResultSet Interface • Maintains a pointer to a row within the tabular results obtained . • The next() method is used to iterate through the rows of the tabular results. Initially the iterator is initialized to a position before the first row. Hence we have to call next() once to move it to the first row. • The different methods are: – getBoolean(int) - Get the value of a column in the current row as a Java boolean. – getDouble(int) - Get the value of a column in the current row as a Java double. – getInt(int) - Get the value of a column in the current row as a Java int. – getString(String)-Get value as java string 35
  36. 36. Database connection class import java.sql.DriverManager; import com.mysql.jdbc.Connection; public class {//declare connection as instance variable public Connection conn; public Dbconnection() { //constructor for the class String url="jdbc:mysql://localhost:3306/"; String dbname=“database_name"; String driver="com.mysql.jdbc.Driver"; String dbusername="root"; String dbpassword="baabtra"; try { Class.forName(driver).newInstance(); conn=(DriverManager.getConnection(url+dbname,dbusername,dbpassword); System.out.println("connected......"); } catch (Exception e) { System.out.println(e.getMessage()); 36
  37. 37. Creating DB layer • Create a method inside AddEmployee class public String registerEmployeeDB(EmployeeBean emp) { } • Strip the object ‘emp’ to get values and store it in variables String employee_id=emp.getEmpId(); String employee_name=emp.getEmpName(); String user_name=emp.getUserName(); String employee_password=emp.getPaassword(); String address=emp.getAddress(); String gender=emp.getGender(); String dob=emp.getDob(); String doj=emp.getDoj(); 37
  38. 38. Add try catch block try{ Connection conn=dbconnection.conn; Statement st=(Statement) conn.createStatement(); try{ Statement st= (Statement) conn.createStatement(); //your logic here } catch (Exception e) { System.out.println(e); } catch (Exception e) { System.out.println(e); e.printStackTrace } Finally{ conn.close() } } 38
  39. 39. Do the database operation for registering the employee //insert data into login table String sqlQuery ="insert into tbl_login(user_name, password,role)"+ "values('"+user_name+"', '"+employee_password+"','EMPLOY')"; int Count=st.executeUpdate(sqlQuery) ; //Check whether data is inserted or not if (Count>0) { int id=0; //select currently inserted id (auto increment )from login table ResultSet rs=st.executeQuery("select max(pk_login_id) as id from tbl_login "); while({ id=rs.getInt("id"); } 39
  40. 40. //Insert data to employee table sqlQuery="insert into tbl_employe(pk_employee,fk_loginid,emp_first_name,emp_addres, "+ "emp_gender,emp_dob,emp_doj) values('"+employee_id+"',"+ id+",'"+employee_name+"','"+ address+"','"+gender+"','"+dob+"','"+doj+"')"; int Count1=st.executeUpdate(sqlQuery); //Return success or fail depending on status of database operation if (Count1>0){ return "Success"; }} else { return "Fail"; } 40
  41. 41. Selecting and displaying data from database using list • Create method for getting data in database layer public List getEmployeeListDB(){ //code for connecting to database //declarea list of Employee bean //do the database operation (select data from database) //store the result set in the list //pass it to service layer } 41
  42. 42. //Declare list of employee bean List<EmployeeBean > details=new ArrayList<EmployeeBean >(); ResultSet rs=s.executeQuery("Select * from employees"); //loop to fetch the query results one by one while({ //ceating object to save each row details EmployeeBean emp=new CustomerBean(); emp.setName(rs.getString("name")); emp.setAddress(rs.getString("address")); emp.setEmail(rs.getString("email")); //adding the objects to the list object that was made details.add(emp); } conn.close(); //returning the list with objects return details; 42
  43. 43. Code in service class import java.util.List; import com.babte.DB.Employee; public class EmployeeService { public List getEmployeeListService() { EmployeeDB ObjEmp=new EmployeeDB(); List list=ObjEmp. getEmployeeListDB(); return list; } } 43
  44. 44. Code in JSP <%@page import="com.babate.service.EmployeeService"%> <%@page import="java.util.List"%> <%@page import="com.babte.Bean.EmployeeBean"%><html> <head> <meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1"> <title>Insert title here</title> </head> <body> Employee Details <table border="1“> <tr> <td>Sl No</td> <td>Name</td> <td>Address</td> <td>Email</td> </tr> 44
  45. 45. <% EmployeeService service=new EmployeeService (); List details= service. getEmployeeListService(); for(int i=0;i<details.size();i++) { EmployeeBean emp =(EmployeeBean )details.get(i); String name= emp.getName(); String address= emp.getAddress(); String email= emp.getEmail(); %> <tr> <td><%=i+1%></td> <td><%=name%></td> <td><%=address%></td> <td><%=email%></td> </tr> <%} %> </table> </body> </html> 45
  46. 46. End of day
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