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Entity means the class which you will use in your program and Table means the actual Database table that you will access through your program. Hibernate being an ORM requires you to declare the relationship between the tables and the classes mapping to them.
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 catalog, and its schema, and enforce unique constraints on columns in the table.
@Entity annotation defines that a class can be mapped to a table. And that is it, it is just a marker, like for example Serializable interface.
The easiest way to set a custom SQL table name is to annotate the entity with @javax. persistence. Table and define its name parameter: @Entity @Table(name = "ARTICLES") public class Article { // ... }
@Entity(name = "someThing") => this name will be used to name the Entity @Table(name = "someThing") => this name will be used to name a table in DB
So, in the first case your table and entity will have the same name, that will allow you to access your table with the same name as the entity while writing HQL or JPQL.
And in second case while writing queries you have to use the name given in @Entity and the name given in @Table will be used to name the table in the DB.
So in HQL your someThing will refer to otherThing in the DB.
@Entity(name = "someThing") => this name will be used to identify the domain ..this name will only be identified by hql queries ..ie ..name of the domain object
@Table(name = "someThing") => this name will be used to which table referred by domain object..ie ..name of the table
@Entity is useful with model classes to denote that this is the entity or table
@Table is used to provide any specific name to your table if you want to provide any different name
Note: if you don't use @Table then hibernate consider that @Entity is your table name by default and @Entity must
@Entity
@Table(name = "emp")
public class Employee implements java.io.Serializable
{
}
@Table's name attribute is the actual table name. @Entitiy's name is useful if you have two @Entity classes with the same name and you need a way to differentiate them when running queries.
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