Do we need both annonation for a model class? What is the difference between @Entity and @Table

@Entity
@Table(name = "widget") // do we need this??
public class WidgetEntity {

  @Id
  @GeneratedValue(strategy = GenerationType.IDENTITY)
  private Long id;
  private String clientName;
}

CodePudding user response：

You need @Entity but @Table is an optional annotation that you can override default table name, schema name etc.

CodePudding user response：

If you are planning some class to be scanned and looked as an entity by Hibernate it must has @Entity annotation. Now since Hibernate is Object-Relational Mapping tool, which means that it is a bridge between objects and the database when you put

@Entity <-- this is an entity class that you will work with
@Table(name = "widget") <-- and this is a corresponding table that matches that entity in the database

Similar thing goes for

@Column(name="clientName")<-- this is a value from your database field that will correspond with your entity field
private String clientName <-- this is your entity field

When using hibernate you need to explain in the class both of the worlds, the SQL world and the Java Hibernate world.