What is the use of @Table annotation in JPA?

Question

The whole point of using these annotations is to be independent of the database provider, and not to regenerate the JAR archive.

If I hardcore the @Table (name = myDatabase.myTableName) I don't see the point of using hibernate in the first place. If I do decide to switch to a different database provider, then I will have to modify the @Table (name = myDatabase.myTableName) annotation in my class , and recompile the application .

Answer 1

@Table Annotation: The @Table annotation allows you to specify the details of the table that will be used to persist the entity in the database.

The @Table annotation provides four attributes, allowing you to override the name of the table, its catalogue, and its schema, and enforce unique constraints on columns in the table. For now we are using just table name which is EMPLOYEE.

@Entity
@Table(name = "EMPLOYEE")
public class Employee {
   @Id @GeneratedValue
   @Column(name = "id")
   private int id;
}

Just add the table name here and database name is not required to give in java code. http://docs.oracle.com/javaee/5/api/javax/persistence/Table.html