The use of @MappedSuperclass

Entity class Baseentity.java

 Packagecom.rock.cft.hibernate;Importjava.util.Date;ImportJavax.persistence.GeneratedValue;ImportJavax.persistence.GenerationType;Importjavax.persistence.Id;ImportJavax.persistence.MappedSuperclass;//@MappedSuperclass used on top of the parent class. This callout is added when the class is definitely a parent class. If you change to @entity, after inheritance, multiple classes inherit, only one table is generated, not multiple inheritance, and multiple tables are generated@MappedSuperclass Public Abstract classbaseentity {PrivateInteger ID;//Database primary Key PrivateDate CreationTime;//creation Time PrivateDate Modificationtime;//Modification Time@Id @GeneratedValue (Strategy=Generationtype.auto) PublicInteger getId () {returnID;}  Public voidsetId (Integer id) { This. ID =ID;}  PublicDate GetCreationTime () {returnCreationTime;}  Public voidsetcreationtime (Date creationtime) { This. CreationTime =CreationTime;}  PublicDate Getmodificationtime () {returnModificationtime;}  Public voidsetmodificationtime (Date modificationtime) { This. Modificationtime =Modificationtime;} }

Entity class Test_no1.java

 PackageCom.rock.cft.test.model;Importjava.io.Serializable;Importjava.util.Date;ImportJavax.persistence.Column;Importjavax.persistence.Entity;Importjavax.persistence.Table;Importcom.rock.cft.hibernate.BaseEntity; @Entity @table (name= "Test_no2") Public classTest_no1extendsBaseEntityImplementsSerializable {PrivateString name;Private intAge ;  PublicString GetName () {returnname;}  Public voidsetName (String name) { This. Name =name;}  Public intGetage () {returnAge ;}  Public voidSetage (intAge ) {   This. Age =Age ;} }

Entity class Test_no2.java

 PackageCom.rock.cft.test.model;Importjava.io.Serializable;Importjava.util.Date;ImportJavax.persistence.Column;Importjavax.persistence.Entity;Importjavax.persistence.Table;Importcom.rock.cft.hibernate.BaseEntity; @Entity @table (name= "Test_no2") Public classTest_no2extendsBaseEntityImplementsSerializable {PrivateDate Testbri; PrivateString Testadr;  PublicDate Gettestbri () {returnTestbri;}  Public voidSettestbri (Date testbri) { This. Testbri =Testbri;}  PublicString Gettestadr () {returnTestadr;}  Public voidSettestadr (String testadr) { This. Testadr =Testadr;} } 

This results in the generation of tables only: Test_no1, Test_no2 two tables, and both tables contain ID, CreationTime, modificationtime three properties

But if you change the @mappedsuperclass to @entity, you're going to create a baseentity table.

The use of @MappedSuperclass