我正在努力创造pojo的。我的要求是根据策略ID检索用户信息。每个客户只有一个地址和一个政策。
所以我创造了三个POJO。 Address.java，Customer.java，Policy.java。
address.Java
@Entity
@Table(name="CUSTOMER_ADDRESS")
public class Address {
@Column(name="ADDRESS_STREET")
private String address_street;
@Column(name="ADDRESS_CITY")
private String address_city;
@Column(name="ADDRESS_STATE")
private String address_state;
@Column(name="ADDRESS_ZIPCODE")
private String address_zipcode;
@GenericGenerator(name = "generator", strategy = "foreign",
parameters = @Parameter(name = "property", value = "CUSTOMER"))
@Id
@GeneratedValue(generator = "generator")
@Column(name="CUSTOMER_ID")
private int customer_id;
public String getAddress_street() {
return address_street;
}
public void setAddress_street(String address_street) {
this.address_street = address_street;
}
public String getAddress_city() {
return address_city;
}
public void setAddress_city(String address_city) {
this.address_city = address_city;
}
public String getAddress_state() {
return address_state;
}
public void setAddress_state(String address_state) {
this.address_state = address_state;
}
public String getAddress_zipcode() {
return address_zipcode;
}
public void setAddress_zipcode(String address_zipcode) {
this.address_zipcode = address_zipcode;
}
public int getCustomer_id() {
return customer_id;
}
public void setCustomer_id(int customer_id) {
this.customer_id = customer_id;
}
}
customer.Java
@Entity
@Table(name="CUSTOMER")
public class Customer {
private int customer_id;
private String customer_name;
private Date customer_dob;
private Address address;
private Policy policy;
@OneToOne
@JoinColumn(name = "CUSTOMER_ID")
public Address getAddress() {
return address;
}
public void setAddress(Address address) {
this.address = address;
}
@OneToOne
@JoinColumn(name = "CUSTOMER_ID")
public Policy getPolicy() {
return policy;
}
public void setPolicy(Policy policy) {
this.policy = policy;
}
@Id
@GeneratedValue(strategy = IDENTITY)
@Column(name = "CUSTOMER_ID")
public int getCustomer_id() {
return customer_id;
}
public void setCustomer_id(int customer_id) {
this.customer_id = customer_id;
}
@Column(name = "CUSTOMER_NAME")
public String getCustomer_name() {
return customer_name;
}
public void setCustomer_name(String customer_name) {
this.customer_name = customer_name;
}
@Column(name = "CUSTOMER_DOB")
public Date getCustomer_dob() {
return customer_dob;
}
public void setCustomer_dob(Date customer_dob) {
this.customer_dob = customer_dob;
}
}
policy.Java
@Entity
@Table(name="CUSTOMER_POLICY_DETAILS")
public class Policy implements Serializable{
/**
*
*/
private static final long serialVersionUID = 1L;
@Id
@Column(name="POLICY_ID")
int policy_id;
@Column(name="POLICY_START_DATE")
String policyStartDate;
@Column(name="POLICY_END_DATE")
String policyEndDate;
@GenericGenerator(name = "generator", strategy = "foreign",
parameters = @Parameter(name = "property", value = "CUSTOMER"))
@Id
@GeneratedValue(generator = "generator")
@Column(name="CUSTOMER_ID")
int customer_id;
public int getCustomer_id() {
return customer_id;
}
public void setCustomer_id(int customer_id) {
this.customer_id = customer_id;
}
public Policy() {
super();
}
public int getPolicy_id() {
return policy_id;
}
public void setPolicy_id(int policy_id) {
this.policy_id = policy_id;
}
public String getPolicyStartDate() {
return policyStartDate;
}
public void setPolicyStartDate(String policyStartDate) {
this.policyStartDate = policyStartDate;
}
public String getPolicyEndDate() {
return policyEndDate;
}
public void setPolicyEndDate(String policyEndDate) {
this.policyEndDate = policyEndDate;
}
}
我应该在Customer类中包含Address对象和Policy对象吗？由于我在Address和Policy类中有customer_id属性，我是否不需要将它包含在Customer类中？
我从您的描述中了解到。客户与地址之间的关系是一对一的，客户必须拥有属于一个客户的地址和地址以及政策。因此无论客户在地址中还是在客户地址中都是如此。
所以在你的情况下你会得到客户对象然后来自同一个对象的地址和政策。我希望回答你的问题。
是。在客户实体中包含地址和策略实体是基于policy_id和address_id提取客户信息的简单方法之一。要实现此目的，您需要在客户实体中包含地址和策略实体的主键。根据您提供的代码，地址实体的连接列必须是Address_id，策略实体的连接列必须是policy_id。