To specify the format that a request can process for a user request, such as the JSON data format, we can use the @RequestMapping annotation with the consumes property in Spring MVC. How is it in detail? Let’s find out in this tutorial! First, I… Read More
In the previous tutorial, I introduced to you all about Reactive Streams in Java which implements Reactive Streams specification. In this tutorial, I will introduce you all one more library that also implements the Reactive Streams specification: it is Project Reactor. How is it in… Read More
We usually use the @Controller annotation to develop Spring MVC applications, but since version 4.x, Spring has introduced another annotation called @RestController. What is the purpose of annotation @RestController? What is the difference between @Controller annotation and @RestController annotation? In this tutorial, let’s find out!… Read More
In this tutorial, we will research together on a final annotation in JPA, beside @ManyToOne, @OneToOne, @OneToMany annotation, to express the relationship between any two tables in the database. That is the annotation @ManyToMany! In case, any two tables have many-many relationships, such as a… Read More
To specify the data format that will be returned to the user when they request a URL, in Spring MVC we can use the @RequestMapping annotation with the produces attribute. How is it in detail? Let’s find out in this tutorial! First, I will create… Read More
Suppose, you are working on a project where the database has two tables, such as student and clazz, structured like below:
|
1 2 3 4 5 6 7 8 9 10 11 12 13 |
CREATE TABLE `clazz` ( `id` int(11) NOT NULL, `name` varchar(255) DEFAULT NULL, PRIMARY KEY (`id`) ) ENGINE=InnoDB DEFAULT CHARSET=utf8; CREATE TABLE `student` ( `id` int(11) NOT NULL, `name` varchar(255) DEFAULT NULL, `clazz_id` int(11) DEFAULT NULL, PRIMARY KEY (`id`), FOREIGN KEY (`clazz_id`) REFERENCES `clazz` (`id`) ) ENGINE=InnoDB DEFAULT CHARSET=utf8; |
As you can see, the clazz table has columns id and name with the primary key id. Student table has columns id, name… Read More
Using the @RequestParam annotation along with the @RequestMapping annotation we can bind the parameter request with the method argument in Spring MVC. How is it in details? We will find out in this tutorial. Assuming now, we need to build a Controller to handle the… Read More
Annotation @ManyToOne in JPA is used to express multiple-to-one relationships between two tables in a database. There are many records in table A related to a record in table B. For example: many different students may have the same class. In this tutorial, we will… Read More
In JPA, to express one relationship to another, for example, a tourist can have a single room in a large hotel, we will use the @OneToOne annotation. How is it in details? In this tutorial, let’s learn about annotation @OneToOne in JPA! First, I will… Read More
In JPA, the EntityManagerFactory object is an entity management object that manages the connection to the database. Using Spring to manage this object will help us a lot in developing Java applications that use JPA. In this tutorial, I will guide you on how to… Read More
