JavaWeb應(yīng)用開發(fā)實驗報告-實驗十二 JPA-3

第第頁實驗十二JPA-3一、實驗?zāi)康恼莆認PA的雙向一對一、雙向一對多的實體映射及其訪問。二、實驗環(huán)境PC系列微機：CPU2G以上，內(nèi)存2G以上，硬盤可以空間：5G以上。操作系統(tǒng)：Windows10。三、實驗步驟1、根據(jù)教材的10.4節(jié)內(nèi)容，編寫雙向一對一和雙向一對多的映射。2、調(diào)試程序。四、實驗報告1、請寫出Person和IDCard實體的雙向一對一代碼。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;//雙向一對一，單項一對一@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;//雙向一對一@EntitypublicclassIDCardimplementsSerializable{ @Id @GeneratedValue privateintid; @Column(nullable=false,length=18,unique=true) privateStringcardNumber; @OneToOne(optional=false,cascade=CascadeType.REFRESH,mappedBy="idCard") privatePersonperson;} 2、請寫出Department和Employee雙向一對多的代碼。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;//雙向一對多@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;//雙向一對多@EntitypublicclassEmployeeimplementsSerializable{ privateintid; privateStringname; privateDepartmentdepartment; @Id @GeneratedValue publicint