JavaWeb应用开发实验报告-实验十二 JPA-3

第第页实验十二JPA-3一、实验目的掌握JPA的双向一对一、双向一对多的实体映射及其访问。二、实验环境PC系列微机：CPU2G以上，内存2G以上，硬盘可以空间：5G以上。操作系统：Windows10。三、实验步骤1、根据教材的10.4节内容，编写双向一对一和双向一对多的映射。2、调试程序。四、实验报告1、请写出Person和IDCard实体的双向一对一代码。Person：packageentity;importjava.io.Serializable;importjavax.persistence.CascadeType;importjavax.persistence.Column;importjavax.persistence.Entity;importjavax.persistence.GeneratedValue;importjavax.persistence.Id;importjavax.persistence.JoinColumn;importjavax.persistence.OneToOne;importjavax.persistence.Table;//双向一对一，单项一对一@Entity@Table(name="person")publicclassPersonimplementsSerializable{ @Id @GeneratedValue @Column(name="personId") privateintpersonId; @Column(name="personName",nullable=false,length=50,insertable=true,updatable=true) privateStringpersonName; @OneToOne(optional=true,cascade=CascadeType.ALL) @JoinColumn(name="idCard_id",unique=true) privateIDCardicCard;}IDCard：packageentity;importjava.io.Serializable;importjavax.persistence.CascadeType;importjavax.persistence.Column;importjavax.persistence.Entity;importjavax.persistence.GeneratedValue;importjavax.persistence.Id;importjavax.persistence.OneToOne;//双向一对一@EntitypublicclassIDCardimplementsSerializable{ @Id @GeneratedValue privateintid; @Column(nullable=false,length=18,unique=true) privateStringcardNumber; @OneToOne(optional=false,cascade=CascadeType.REFRESH,mappedBy="idCard") privatePersonperson;} 2、请写出Department和Employee双向一对多的代码。Department：packageentity;importjava.io.Serializable;importjava.util.Collection;importjavax.persistence.CascadeType;importjavax.persistence.Entity;importjavax.persistence.FetchType;importjavax.persistence.GeneratedValue;importjavax.persistence.Id;importjavax.persistence.JoinColumn;importjavax.persistence.JoinTable;importjavax.persistence.OneToMany;//双向一对多@EntitypublicclassDepartmentimplementsSerializable{ @Id privateintid; privateStringname; @OneToMany(cascade=CascadeType.ALL,fetch=FetchType.EAGER,mappedBy="department") privateCollection<Employee>employees;}Employee：packageentity;importjava.io.Serializable;importjavax.persistence.Entity;importjavax.persistence.GeneratedValue;importjavax.persistence.Id;importjavax.persistence.JoinColumn;importjavax.persistence.ManyToOne;//双向一对多@EntitypublicclassEmployeeimplementsSerializable{ privateintid; privateStringname; privateDepartmentdepartment; @Id @GeneratedValue publicint