JPA中InheritanceType的类型有哪些？

JPA中的InheritanceType用于定义实体的继承映射策略，下面web建站小编给大家简单介绍一下关于InheritanceType的几种类型！

SINGLE_TABLE：单表继承映射。父类和子类共享同一张表,使用discriminator列区分类型。

@Entity
@Inheritance(strategy = InheritanceType.SINGLE_TABLE)
@DiscriminatorColumn(name = "TYPE")  
public class Person { ... }  

@Entity
public class Employee extends Person { ... }  

JOINED：联接继承映射。父类和子类各自的表,并且有外键相连。

@Entity
@Inheritance(strategy = InheritanceType.JOINED)
public class Person { ... }   

@Entity
public class Employee extends Person { ... } 

MappedSuperclass：将父类映射为抽象类,其不映射为表,仅用于提供字段映射信息。

@MappedSuperclass
public abstract class Person { ... }

@Entity
public class Employee extends Person { ... } 

TABLE_PER_CLASS：各类一表继承映射。每一个实体类对应一张表,不共享表。

@Entity
@Inheritance(strategy = InheritanceType.TABLE_PER_CLASS)
public class Person { ... }   

@Entity 
public class Employee extends Person { ... }