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| Name | Mapping a Database Table to a JPA Entity |
| Video Uploader | Video From Tech with Monir |
| Upload Date | This Video Uploaded At 14-12-2022 15:11:02 |
| Video Discription | In a Spring Boot application, an entity class is a Java class that represents a database table. It is used to map the fields of the class to the columns of the table, and to define the relationships between different entities. An entity class typically has the following characteristics: It is annotated with the @Entity annotation to indicate that it represents a database table. It has fields that correspond to the columns of the table. These fields are typically private and are accessed using getter and setter methods. It has a no-arg constructor and a constructor that initializes all of the fields. It may have annotations on the fields or on the getter methods to specify how the fields should be mapped to the columns of the table. For example, the @Column annotation can be used to specify the name of the column, the data type, and other properties. It may have annotations on the fields or on the getter methods to define relationships between entities. For example, the @OneToMany annotation can be used to define a one-to-many relationship between two entities, while the @ManyToOne annotation can be used to define a many-to-one relationship. Here is an example of an entity class that represents a customer table in a database: Copy code @Entity public class Customer { @Id @GeneratedValue(strategy = GenerationType.IDENTITY) private Long id; @Column(name = "first_name") private String firstName; @Column(name = "last_name") private String lastName; private String email; // Constructors, getters, and setters... } Entity classes are used in a Spring Boot application to map the fields of a Java class to the columns of a database table and to define the relationships between different entities. There are several reasons why this is useful: It allows you to work with the data in your database using familiar Java objects, rather than having to use raw SQL queries or a database-specific API. It allows you to define the relationships between different entities in your application, which can be useful for modeling complex data structures and for optimizing database queries. It allows you to use the Spring Data JPA framework to easily persist, update, and delete entities in the database, as well as to execute queries and retrieve data from the database. It allows you to use the Hibernate ORM (Object-Relational Mapping) framework to automatically map the fields of the entity class to the columns of the database table, and to handle the conversion between Java objects and database records. To create a JPA entity class from a database table in IntelliJ IDEA, you can follow these steps: In the Project view, right-click the src/main/java directory and select New then Package. Enter the name of the package where you want to create the entity class, and click OK. Right-click the package and select New then JPA Entity Class. In the New JPA Entity Class dialog, enter the name of the entity class and select the database table that you want to use to create the class. Click OK. The entity class will be created and added to your project. It will have fields that correspond to the columns of the database table, and it will be annotated with the @Entity annotation to indicate that it represents a database table. You can then add getter and setter methods for the fields and define relationships between the entity and other entities in your application, if necessary. As part of the spring boot tutorial series for absolute beginners, this quick tutorial shows how to create a Database entity in spring boot to interact with the database. Whatever ORM you use, you need the entity model representing the database table to interact with the database. I used the IntelliJ idea to create an entity from the database which connects to the database first and then loads the tables which do not have an entity in the project. _mDKqZO9FzI |
| Category | Education |
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