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:
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@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
In tutorial basic about Hibernate and basic about JPA, I’ve called classes that map the clazz tables and students in the database as Java objects. But in essence, I have to call them are the entities because they represent tables in the database and each… Read More
I introduced to you all basic about Hibernate, so you will know in Hibernate, an object implements the SessionFactory interface, which will hold information related to the database connection, the entity to manipulate the database. It’s better if this object is managed by Spring, when… Read More
To test whether the validity of tags, attributes in an XML file are according to the needs we want or not, you can use an XSD Schema file. What is it? We will find out in this tutorial. Assume now, you are working with an… Read More
In this tutorial, as the tutorial introducing basic about Hibernate, not lengthy, I will go straight to an example of JPA with the implementation of Hibernate to give you a first look and understand how JPA works. First, I will create a Maven project as… Read More
If you, who have ever worked on XML files, are more or less aware of the namespace concept in XML. Let me give you the following example to give you a first look at it:
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<?xml version="1.0" encoding="UTF-8"?> <classes xmlns:c1="https://huongdanjava.com/class1" xmlns:c2="https://huongdanjava.com/class2"> <c1:class> <c1:students> <c1:student> <c1:name>Khanh</c1:name> <c1:address>123</c1:address> </c1:student> <c1:student> <c1:name>Quan</c1:name> <c1:address>456</c1:address> </c1:student> </c1:students> </c1:class> <c2:class> <c2:students> <c2:student> <c2:name>Khanh</c2:name> <c2:address>789</c2:address> </c2:student> <c2:student> <c2:name>Duy</c2:name> <c2:address>234</c2:address> </c2:student> </c2:students> </c2:class> </classes> |
Declaring xmlns:c1=”https://huongdanjava.com/class1″ or xmlns:c2=”https://huongdanjava.com/class2″ then the xmlns:c1 or xmlns:c2… Read More
Hibernate, as I say in this tutorial, besides implementing the JPA specification, also implements its own framework for connecting and manipulating with database management systems. In this first tutorial about Hibernate, I will go straight to an example of using Hibernate to get database data,… Read More
What is the HTTP client? For example, if you want to access a website, you are a client. You type the URL of the website into the browser, and you get the content of that website in the browser. Most websites use the HTTP protocol,… Read More
