January 2020

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

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>  <dependency> <groupId>org.springframework</groupId> <artifactId>spring-webmvc</artifactId> <version>5.2.1.RELEASE</version> </dependency>  <dependency> <groupId>commons-fileupload</groupId> <artifactId>commons-fileupload</artifactId> <version>1.3.2</version> </dependency>  <dependency> <groupId>commons-io</groupId> <artifactId>commons-io</artifactId> <version>2.5</version> </dependency> </dependencies> </project>

Month: January 2020

Hibernate 5.4 Configuration

Servlet File Upload