In this tutorial, I will guide you to create a new Jakarta EE application using Maven. You can use any Java IDE that supports Maven such as Eclipse, IntelliJ, .. or use the Maven command line! I will use Eclipse in this tutorial. First, in… Read More
H2 database is an open source Java database. We often use the H2 database for testing purposes with its in-memory database feature. In addition, H2 database can also be installed to use as a normal database. In this tutorial, I will guide you how to… Read More
In the previous tutorial, you learned about Serialization that allows us to store the state of a Java object. All of the properties of the Java object are stored somewhere so that other processes can retrieve it to reuse. But in reality, sometimes we need… Read More
Personally, I prefer to use Subversion to handle code rather than CVS, but because I’m working on a project that requires CVS, I have to try to understand it. This tutorial aims to save the guide how to login to a CVS server to be… Read More
Perhaps in you all, everyone knows and works with Object Oriented Programming (OOP), but with Aspect Oriented Programming (AOP), maybe someone does not know. In this tutorial, I will present the basic concepts of aspect-oriented programming so that you can better understand it. I do… Read More
In the previous tutorials part 1 and part 2 about the @GeneratedValue annotation in JPA, I mentioned the allocationSize attribute when using the GenerationType.TABLE and GenerationType.SEQUENCE strategies. Notice that they are not detailed enough for you to understand the allocationSize attribute, so I added this article… Read More
In the case of column name of a table in the database which you are working on is not same with the name of the entity you are defining, you can use the @Column annotation to change the name. Here are some other functions that… Read More
This tutorial is continued part 1. The next strategy we want to talk is the GenerationType.SEQUENCE strategy You declare this strategy in the Clazz entity as follows:
|
1 2 3 |
@Id @GeneratedValue(strategy = GenerationType.SEQUENCE) private Long id; |
Similar to GenerationType.TABLE strategy, GenerationType.SEQUENCE strategy also depends on the value of “hibernate.id.new.generator_mappings” property in the JPA… Read More
When defining a primary key of a table in the database, we usually add AUTO_INCREMENT. With this definition, we do not need to care about the value of the primary key column every time we add a new data to the table, which will be… Read More
In this tutorial, I will cover one of the basic annotations to work with mapping the columns of tables in the database, that is the @Id annotation in JPA. We will go straight into the problem. This annotation is declared to determine where the primary key… Read More
