Author: admin

 

Core Hibernate 5.4 Configuration

<project xmlns="http://maven.apache.org/POM/4.0.0"
  xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
  <modelVersion>4.0.0</modelVersion>
  <groupId>HibernateProj</groupId>
  <artifactId>HibernateProj</artifactId>
  <version>0.0.1-SNAPSHOT</version>
  <build>
    <sourceDirectory>src</sourceDirectory>
    <plugins>
      <plugin>
        <artifactId>maven-compiler-plugin</artifactId>
        <version>3.8.0</version>
        <configuration>
          <source>1.8</source>
          <target>1.8</target>
        </configuration>
      </plugin>
    </plugins>
  </build>
  <dependencies>
    <!-- https://mvnrepository.com/artifact/org.hibernate/hibernate-core -->
    <dependency>
      <groupId>org.hibernate</groupId>
      <artifactId>hibernate-core</artifactId>
      <version>5.4.10.Final</version>
    </dependency>

    <!-- https://mvnrepository.com/artifact/mysql/mysql-connector-java -->
    <dependency>
      <groupId>mysql</groupId>
      <artifactId>mysql-connector-java</artifactId>
      <version>8.0.15</version>
    </dependency>
  </dependencies>
</project>

<?xml version="1.0" encoding="UTF-8"?>

<!DOCTYPE hibernate-configuration PUBLIC
"-//Hibernate/Hibernate Configuration DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd">
<hibernate-configuration>
    <session-factory>
    	<!-- <property name="hibernate.current_session_context_class">thread</property> -->
    	<property name="hibernate.current_session_context_class">org.hibernate.context.internal.ThreadLocalSessionContext</property>
        <property name="hibernate.bytecode.use_reflection_optimizer">false</property>
        <property name="hibernate.connection.driver_class">com.mysql.jdbc.Driver</property>
        <property name="hibernate.connection.password"></property>
        <property name="hibernate.connection.url">jdbc:mysql://localhost:3306/test</property>
        <property name="hibernate.connection.username">root</property>
        <property name="hibernate.dialect">org.hibernate.dialect.MySQLDialect</property>
        <property name="show_sql">true</property>
    </session-factory>
</hibernate-configuration>

package com;

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.Statement;
import java.util.List;

import org.hibernate.Criteria;
import org.hibernate.Session;
import org.hibernate.cfg.Configuration;
import org.hibernate.query.Query;

public class MainClass {
  @SuppressWarnings("deprecation")
  public static void main(String[] args) {

    try{  
      Class.forName("com.mysql.cj.jdbc.Driver");  
      Connection con=DriverManager.getConnection(  
          "jdbc:mysql://localhost:3306/test","root","");  
      //here sonoo is database name, root is username and password  
      Statement stmt=con.createStatement();
//			stmt.executeUpdate("insert into emp VALUES (null, 'shailesh', 31, 'Nagpur')");
      ResultSet rs=stmt.executeQuery("select * from emp");  
      while(rs.next())
        System.out.println(rs.getString(1)+"  "+rs.getString(2)+"  "+rs.getString(3)+"  "+rs.getString(4));  
      con.close();  
    } catch(Exception e){ System.out.println(e);}  

    System.out.println("Hibernate connection established successfully...");

    Session session = new Configuration().configure("hibernate.cfg.xml").buildSessionFactory().openSession();
    Query query = session.createNativeQuery("select * from emp");
    List<Student[]> list = query.list();
    System.out.println(list);

    for(Object[] obj : list) {
      Student std = new Student((Integer)obj[0], (String)obj[1], (Integer)obj[2], (String)obj[3]);
      System.out.println(std);
    }		
    ////////////////////////////////////////////////
    Query query2 = session.createNativeQuery("Select id, name, age, city from emp");
    query2.setResultTransformer(Criteria.ALIAS_TO_ENTITY_MAP);
    List<Student> students = query2.list();
    System.out.println(students);
    session.close();
    //==============================//
    Session session2 = new Configuration().configure("database.cfg.xml").buildSessionFactory().openSession();
    List list2 = session2.createNativeQuery("select * from testdmarc").list();
    System.out.println(list2);
  }
}

 

Reference:

https://docs.jboss.org/hibernate/orm/5.4/userguide/html_single/Hibernate_User_Guide.html#sql

https://tools.jboss.org/downloads/jbosstools/2019-09/4.13.0.Final.html#update_site

https://www.tutorialspoint.com/hibernate/hibernate_examples.htm

Hibernate Native SQL Query Example

Ref:
https://www.codejava.net/java-ee/servlet/java-file-upload-example-with-servlet-30-api

https://www.baeldung.com/upload-file-servlet

Servlet 3 File Upload – @MultipartConfig, Part

import java.io.File;
import java.io.IOException;
import java.io.PrintWriter;

import javax.servlet.ServletException;
import javax.servlet.annotation.MultipartConfig;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.Part;

/**
 * Servlet implementation class MultiPartServlet
 */
@WebServlet("/multiPartServlet")
@MultipartConfig(fileSizeThreshold=1024*1024*10, 	// 10 MB 
maxFileSize=1024*1024*50,      	// 50 MB
maxRequestSize=1024*1024*100)   	// 100 MB
public class MultiPartServlet extends HttpServlet {
  private static final long serialVersionUID = 1L;
       
    /**
     * @see HttpServlet#HttpServlet()
     */
    public MultiPartServlet() {
        super();
        // TODO Auto-generated constructor stub
    }

  /**
   * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
   */
  protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
    // TODO Auto-generated method stub
    response.getWriter().append("Served at: ").append(request.getContextPath());
    
    PrintWriter out = response.getWriter();
  }

  private static final String SAVE_DIR = "uploadFiles";
  
  /**
   * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
   */
  protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
    
    // gets absolute path of the web application
        String appPath = request.getServletContext().getRealPath("");
        // constructs path of the directory to save uploaded file
        String savePath = appPath + File.separator + SAVE_DIR;
         
        // creates the save directory if it does not exists
        File fileSaveDir = new File(savePath);
        if (!fileSaveDir.exists()) {
            fileSaveDir.mkdir();
        }
    
    
    for (Part part : request.getParts()) {
        String fileName = extractFileName(part);
//		    part.write(fileName);
        response.getWriter().println("/home/shailesh/eclipse-workspace/TestProject/WebContent/images/" + fileName);
        part.write("/home/shailesh/eclipse-workspace/TestProject/WebContent/images/" + fileName);
    }
    response.getWriter().println("Uploaded...");
    doGet(request, response);
  }
  
  private String extractFileName(Part part) {
      String contentDisp = part.getHeader("content-disposition");
      String[] items = contentDisp.split(";");
      for (String s : items) {
          if (s.trim().startsWith("filename")) {
              return s.substring(s.indexOf("=") + 2, s.length()-1);
          }
      }
      return "";
  }

}

 

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
  <modelVersion>4.0.0</modelVersion>
  <groupId>TestProject</groupId>
  <artifactId>TestProject</artifactId>
  <version>0.0.1-SNAPSHOT</version>
  <packaging>war</packaging>
  <build>
    <sourceDirectory>src</sourceDirectory>
    <plugins>
      <plugin>
        <artifactId>maven-compiler-plugin</artifactId>
        <version>3.8.0</version>
        <configuration>
          <source>1.8</source>
          <target>1.8</target>
        </configuration>
      </plugin>
      <plugin>
        <artifactId>maven-war-plugin</artifactId>
        <version>3.2.3</version>
        <configuration>
          <warSourceDirectory>WebContent</warSourceDirectory>
        </configuration>
      </plugin>
    </plugins>
  </build>
  <dependencies>
  	<!-- https://mvnrepository.com/artifact/org.springframework/spring-webmvc -->
  <dependency>
    	<groupId>org.springframework</groupId>
   	 	<artifactId>spring-webmvc</artifactId>
    	<version>5.2.1.RELEASE</version>
  </dependency>
  
  <!-- Apache Commons FileUpload -->
    <dependency>
        <groupId>commons-fileupload</groupId>
        <artifactId>commons-fileupload</artifactId>
        <version>1.3.2</version>
    </dependency>

    <!-- Apache Commons IO -->
    <dependency>
        <groupId>commons-io</groupId>
        <artifactId>commons-io</artifactId>
        <version>2.5</version>
    </dependency>
  
  </dependencies>
</project>

<form method="post" action="multiPartServlet" enctype="multipart/form-data">
  Choose a file: <input type="file" name="multiPartServlet" />
    <input type="submit" value="Upload" />
</form>

 

Spring 5 MVC + Hibernate 5 Example

 

https://www.boraji.com/spring-mvc-5-static-resources-handling-example

 

 

Classes and Objects
1. Create class Rectangle
a) data members
– length
– breadth
b) methods
– setDimensions
– area
– perimeter

2. Create class Cube
a) data members
– length
– breadth
– height
b) methods
– setDimensions
– volume

3. Create class Worker
a) data members
– wages
– wdays
b) methods
– setData
– payment

Method Overloading

1. Create class Box
a) data members
– length
– breadth
– height
b) methods
– setDimensions(3 args)
– setDimensions(1 arg)
– volume

Method Returning Value
1. WAP to find total payment of two employeesCreate
Create class Worker
a) data members
– wages
– wdays
b) methods
– setData
– int payment

Constructors
1. Create class Circle and initialize radius using a default constructor
2. Create class Circle and initialize radius using parameterized constructor
3. Create class Circle and define two constructor default and parameterized (Constructor overloading)

Static data members and member functions
1. Create a class Circle and find its area
a) data members
– int radius
– static double pi
b) methods
– area

2. Create a class Bank Account and find interest
a) data members
– int account_number
– int balance
– static double interest_rate
b) methods
– interest (balance * interest_rate * no_of_period / 100.0)
– changeRate (change interest_rate)