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Adding Databse Capibility to Struts2.2.1
Posted on: February 12, 2011 at 12:00 AM
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In this tutorial you will learn how to add the database capability to in Struts2.2.1

Adding database capability in Struts 2.2.1 application

To add the database capability we have used Data Access Object (DAO) design pattern.

ConnectionFactory.java

package net.roseindia.dao;

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.SQLException;

public class ConnectionFactory {
	String driverName = "com.mysql.jdbc.Driver";
	String conUrl = "jdbc:mysql://localhost:3306/studentadmissionprocess";
	String dbUser = "root";
	String dbPwd = "root";

	private static ConnectionFactory connectionFactory = null;

	private ConnectionFactory() {
		try {
			Class.forName(driverName);
		} catch (ClassNotFoundException e) {
			e.printStackTrace();
		}
	}

	public Connection getConnection() throws SQLException {
		Connection conn = null;
		conn = DriverManager.getConnection(conUrl, dbUser, dbPwd);
		return conn;
	}

	public static ConnectionFactory getInstance() {
		if (connectionFactory == null) {
			connectionFactory = new ConnectionFactory();
		}
		return connectionFactory;
	}
}

ApplicationDAO.java

package net.roseindia.dao;

import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.ArrayList;
import java.util.List;

import net.roseindia.model.SearchModel;
import net.roseindia.model.StudentAdmissionModel;
import net.roseindia.model.UpdateModel;

public class ApplicationDAO {

	Connection connection = null;
	PreparedStatement ptmt = null;
	ResultSet rs = null;

	public ApplicationDAO() {

	}

	private Connection getConnection() throws SQLException {
		java.sql.Connection con;
		con = ConnectionFactory.getInstance().getConnection();
		return con;
	}

	public void add(StudentAdmissionModel studentAddmission) {

		try {
			String queryString = "INSERT INTO stud_admission(s_name, f_name, dob, c_date, class1, address, phoneno, fee) VALUES(?,?,?,?,?,?,?,?)";
			connection = getConnection();
			ptmt = connection.prepareStatement(queryString);
			ptmt.setString(1, studentAddmission.getName());
			ptmt.setString(2, studentAddmission.getFname());
			ptmt.setString(3, studentAddmission.getDob());
			ptmt.setString(4, studentAddmission.getCurrentDate());
			ptmt.setString(5, studentAddmission.getClass1());
			ptmt.setString(6, studentAddmission.getAddress());
			ptmt.setString(7, studentAddmission.getPhoneno());
			ptmt.setLong(8, studentAddmission.getFee());
			ptmt.executeUpdate();
			System.out.println("Data Added Successfully");
		} catch (SQLException e) {
			e.printStackTrace();
		} finally {
			try {
				if (ptmt != null)
					ptmt.close();
				if (connection != null)
					connection.close();
			} catch (SQLException e) {
				e.printStackTrace();
			} catch (Exception e) {
				e.printStackTrace();
			}

		}
	}

	public StudentAdmissionModel search(SearchModel model) {
		StudentAdmissionModel student=new StudentAdmissionModel();
		String query;
		query = "select * from stud_admission where s_name='"
				+ model.getS_name() + "' or roll_no='" + model.getS_roll()
				+ "' or class1='" + model.getCalss1() + "'";
		System.out.println(query);
		try {
			connection = getConnection();
			ptmt = connection.prepareStatement(query);
			rs = ptmt.executeQuery(query);
			System.out.println("Hello" + rs);
			while (rs.next()) {
				student.setName(rs.getString("s_name"));
				student.setFname(rs.getString("f_name"));
				student.setDob(rs.getString("dob"));
				student.setCurrentDate(rs.getString("c_date"));
				student.setClass1(rs.getString("class1"));
				student.setAddress(rs.getString("address"));
				student.setPhoneno(rs.getString("phoneno"));
				student.setFee(rs.getLong("fee"));
				student.setRoll(rs.getInt("roll_no"));
			}
		} catch (Exception e) {
			e.toString();
		}
	finally {
		try {
			if (ptmt != null)
				ptmt.close();
			if (connection != null)
				connection.close();
		} catch (SQLException e) {
			e.printStackTrace();
		} catch (Exception e) {
			e.printStackTrace();
		}
	}
		return student;
	}
	
	public StudentAdmissionModel search(int roll){
		try{
			connection=getConnection();
			StudentAdmissionModel model=new StudentAdmissionModel();
			String query="select * from stud_admission where roll_no='"+roll+"'";
			ptmt=connection.prepareStatement(query);
			rs=ptmt.executeQuery();
			while(rs.next()){
				model.setName(rs.getString("s_name"));
				model.setFname(rs.getString("f_name"));
				model.setDob(rs.getString("dob"));
				model.setCurrentDate(rs.getString("c_date"));
				model.setClass1(rs.getString("class1"));
				model.setAddress(rs.getString("address"));
				model.setPhoneno(rs.getString("phoneno"));
				model.setFee(rs.getLong("fee"));
				model.setRoll(rs.getInt("roll_no"));
			}			
			return model;
		}
		catch(Exception e){
			e.toString();
		}
		finally {
			try {
				if (ptmt != null)
					ptmt.close();
				if (connection != null)
					connection.close();
			} catch (SQLException e) {
				e.printStackTrace();
			} catch (Exception e) {
				e.printStackTrace();
			}
		}
		return null;
	}
	public void delete(int roll){
		try{
			connection=getConnection();
			String query="delete from stud_admission where roll_no=?";
			ptmt=connection.prepareStatement(query);
			ptmt.setInt(1, roll);
			ptmt.executeUpdate();
			System.out.println("Rocord deleted");
			}
		catch(Exception e){
			e.toString();
		}
		finally {
			try {
				if (ptmt != null)
					ptmt.close();
				if (connection != null)
					connection.close();
			} catch (SQLException e) {
				e.printStackTrace();
			} catch (Exception e) {
				e.printStackTrace();
			}
		}
	}
	
	public void update(UpdateModel model){
		String query="update stud_admission set s_name=?, f_name=?, dob=?, c_date=?, class1=?, address=?, phoneno=?, fee=? where roll_no=?";
		try{
			connection=getConnection();
			ptmt=connection.prepareStatement(query);
			ptmt.setString(1, model.getName());
			ptmt.setString(2, model.getFname());
			ptmt.setString(3, model.getDob());
			ptmt.setString(4, model.getCurrentDate());
			ptmt.setString(5, model.getClass1());
			ptmt.setString(6, model.getAddress());
			ptmt.setString(7, model.getPhoneno());
			ptmt.setLong(8, model.getFee());
			ptmt.setInt(9, model.getRoll());
			ptmt.executeUpdate();
			System.out.println("Table Updated Suucessfully");
			}
		catch(Exception e){
			e.toString();
		}
		finally {
			try {
				if (ptmt != null)
					ptmt.close();
				if (connection != null)
					connection.close();
			} catch (SQLException e) {
				e.printStackTrace();
			} catch (Exception e) {
				e.printStackTrace();
			}
		}
	}
	
}

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