Anyone who wants to learn about JPA needs to know about the concept of Object Relational Mapping. So what is it actually? Suppose, you are working on an application and your application uses a table named users in the database. The structure of this table… Read More
We already know how to get an object from the Spring container using the getBean() method but sometimes we have the opposite need. That is, we want to use the Spring container in our object to have access to other objects in its container. Is… Read More
Even though creating a file in Java is easy, deleting a file is easier. In this tutorial, I will guide you how to delete a file in Java. The File object, which is the main file management object since Java version 6 and earlier, cannot be… Read More
Creating files in Java is a basic operation, everyone must know. So, in this tutorial, I just synthesized the ways that we can create a file in Java. Maybe it is useful for beginners of Java programming. First, I have to mention the File object.… Read More
In my tutorials about the Spring framework, I often use the object of the ApplicationContext interface as a Spring container to call the object that I need to retrieve. For example, in the previous tutorial:
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package com.huongdanjava.springbeanautowiring; import org.springframework.context.ApplicationContext; import org.springframework.context.support.ClassPathXmlApplicationContext; public class Application { public static void main(String[] args) { ApplicationContext context = new ClassPathXmlApplicationContext("spring.xml"); Room room = (Room) context.getBean("room"); if (room.getTable() != null) { System.out.println(room.getTable().toString()); } } } |
But in fact, Spring also provides us with another… Read More
If any of you have worked with Apache Maven, you will know the concept of Local Maven Repository. For those who do not know, I would like to say roughly as follows: Local Maven Repository is a directory in your computer. It is created when you… Read More
The nature of Spring is to create objects in its container so that when you need an object, you can call the Spring container to get that object. Therefore, Spring seeks all the ways to support us in the creation of objects in the container… Read More
Injecting this object into another object in Spring is very common when you work with projects that use the Spring framework. In my previous tutorial, I mentioned Spring’s ref attribute to include a Shape object into a Drawing object, in this tutorial I’ll talk about… Read More
In the previous tutorial, I showed you how to represent a Composite Primary Key in JPA using the @Embeddable annotation. In addition to this, we also have a way to represent the Composite Primary Key in JPA which is using the @IdClass annotation. How is… Read More
In the previous tutorial, I introduced you to the @ManyToMany annotation to express many-to-many relationships between any two tables in the database, such as a developer can work on multiple projects and vice versa: a project can have many developers. But in fact, we need… Read More
