我有一个mysql数据库，我从中使用Hibernate生成了TransferObject。城市和患者，城市和医生，专业和医生之间存在一对多的关系。但是，从这些一对多关系查询数据库时，我没有得到任何返回值。
当我测试RestFul终点时，我得到：
/医生/所有
[{"id":1,"email":"papa@papa.com","fatherName":"πατέρας","firstName":"όνομα","lastName":"επίθετο","telephone":"2821074737"},{"id":2,"email":"lala@gmail.com","fatherName":"dfjs","firstName":"Ιωσήφ","lastName":"Βαρουξάκης","telephone":"8583848824"},{"id":3,"email":"","fatherName":"","firstName":"Χαράλαμπος","lastName":"Πρωτοπαπαδάκης","telephone":"4343454345"},{"id":4,"email":"","fatherName":"","firstName":"Ελευθέριος","lastName":"Παπαδάκης","telephone":"2821084834"},{"id":5,"email":"","fatherName":"","firstName":"Παναγιώτης","lastName":"Τζεράκης","telephone":"28210848383"},{"id":6,"email":"","fatherName":"","firstName":"Κων/νος","lastName":"Κωνσταντινίδης","telephone":"2821084838"},{"id":7,"email":"","fatherName":"","firstName":"Παναγιώτης","lastName":"Ψιστάκης","telephone":"2810838383"},{"id":8,"email":"","fatherName":"Εμμανουήλ","firstName":"Θεανώ","lastName":"Πατακάκη","telephone":"2821048438"},{"id":9,"email":"","fatherName":"","firstName":"Μαρία","lastName":"Καφούση","telephone":"2810848283"},{"id":10,"email":"","fatherName":"","firstName":"Μανούσος","lastName":"Χριστοδουλάκης","telephone":"2810848383"},{"id":11,"email":"saf@fdsa.gr","fatherName":"αφδσ","firstName":"φδσα","lastName":"σφδ","telephone":"2323233223"},{"id":12,"email":"","fatherName":"φεδσαφ","firstName":"φδσαφδσα","lastName":"φδσαφγσφαδ","telephone":"3333333333"},{"id":13,"email":"mixtou@gmail.co","fatherName":"Dimitrios","firstName":"Toutoudakis","lastName":"Mixail","telephone":"6948571893"}]
/患者/所有
[{"id":1,"birthday":"1975-08-19","email":"mixtou@gmail.com","fatherName":"Δημήτριος","firstName":"Μιχαήλ","lastName":"Τουτουδάκης","telephone":"6948571893","sex":true},{"id":2,"birthday":"1942-06-10","email":"lla@gmail.com","fatherName":"Μιχαήλ","firstName":"Δημήτριος","lastName":"Τουτουδάκης","telephone":"7364927473","sex":true},{"id":3,"birthday":"1975-05-06","email":"lala@gmail.com","fatherName":"Μιχαήλ","firstName":"Μιχαήλ","lastName":"Μαραγκάκης","telephone":"8484848484","sex":false},{"id":4,"birthday":"1957-08-14","email":"lasdjf@lkdafs.gr","fatherName":"Τεστ","firstName":"Μηνάς","lastName":"Παπαδάκης","telephone":"8484842747","sex":false},{"id":5,"birthday":"2018-03-26","email":"","fatherName":"","firstName":"Στέφανος","lastName":"Μαριόλος","telephone":"4838583845","sex":true},{"id":6,"birthday":"2018-03-20","email":"jkdas@gjal.com","fatherName":"Μ..κας","firstName":"Κων/νος","lastName":"Μπλαζάκης","telephone":"2347878763","sex":false},{"id":7,"birthday":"2018-03-08","email":"ajs@gjla;.gr","fatherName":"pateras","firstName":"f;ldas","lastName":"akdfsj","telephone":"445354345453","sex":true},{"id":8,"birthday":"2018-03-12","email":"lala@gam.gr","fatherName":"Εμμανουήλ","firstName":"Ιωάννης","lastName":"Μαλανδράκης","telephone":"4343434343","sex":false},{"id":9,"birthday":"1980-05-12","email":"antonis@gmai.com","fatherName":"Δεν Ξέρω","firstName":"Αντώνιος","lastName":"Ιγγλεζάκης","telephone":"28210848484","sex":false},{"id":10,"birthday":"2018-04-19","email":"test@etes.gr","fatherName":"test","firstName":"test`","lastName":"tet","telephone":"2345674424","sex":false},{"id":11,"birthday":"1984-02-13","email":"lala@gmail.com","fatherName":"Δημήτριος","firstName":"Ιωάννης","lastName":"Μαλανδράκης","telephone":"1223323344","sex":false},{"id":12,"birthday":"2018-05-16","email":"lala@gmail.com","fatherName":"Τεεε","firstName":"Τέστης","lastName":"Τεστάκης","telephone":"84848484823","sex":false},{"id":13,"birthday":"2018-06-05","email":"lala@gmail.com","fatherName":"test","firstName":"test","lastName":"test","telephone":"2821022222","sex":true}]
/城市/所有
[{"id":4,"name":"Αγ. Νικόλαος"},{"id":3,"name":"Ηράκλειο"},{"id":2,"name":"Ρέθυμνο"},{"id":5,"name":"Ρόδος"},{"id":1,"name":"Χανιά"}]
/特色/所有
[{"id":1,"name":"Αγγειοχειρουργική"},{"id":2,"name":"Αιματολογία"},{"id":3,"name":"Ακτινοδιαγνωστική"},{"id":4,"name":"Ακτινοθεραπευτική"},{"id":5,"name":"Αλλεργιολογία"},{"id":6,"name":"Αναισθησιολογία"},{"id":7,"name":"Γαστρεντερολογία"},{"id":8,"name":"Γενική Ιατρική"},{"id":9,"name":"Δερματολογία"},{"id":10,"name":"Ενδοκρινολογία"},{"id":12,"name":"Ιατρική Εργασίας"},{"id":13,"name":"Ιατροδικαστική"},{"id":14,"name":"Καρδιολογία"},{"id":15,"name":"Κυτταρολογία"},{"id":16,"name":"Μαιευτική Γυναικολογία"},{"id":11,"name":"Μικροβιολογία"},{"id":17,"name":"Νευρολογία"},{"id":18,"name":"Νευροχειρουργική"},{"id":19,"name":"Νεφρολογία"},{"id":20,"name":"Ορθοπαιδική"},{"id":21,"name":"Ουρολογία"},{"id":22,"name":"Οφθαλμολογία"},{"id":23,"name":"Παθολογία"},{"id":24,"name":"Παθολογική Ανατομική"},{"id":25,"name":"Παθολογική Ογκολογία"},{"id":26,"name":"Παιδιατρική"},{"id":27,"name":"Παιδοψυχιατρική"},{"id":28,"name":"Πλαστική Χειρουργική"},{"id":29,"name":"Πνευμονολογία - Φυματιολογία"},{"id":30,"name":"Πυρηνική Ιατρική"},{"id":31,"name":"Ρευματολογία"},{"id":39,"name":"Στοματική & Γναθοπροσωπική Χειρουργική"},{"id":32,"name":"Φυσική Ιατρική και Αποκατάσταση"},{"id":33,"name":"Χειρουργική"},{"id":36,"name":"Χειρουργική Β΄"},{"id":34,"name":"Χειρουργική Θώρακος"},{"id":35,"name":"Χειρουργική Παίδων"},{"id":37,"name":"Ψυχιατρική"},{"id":38,"name":"ΩΡΛ"}]
除了一个例外，一切正常。城市和专业的关系。我在回复中没有获得城市或专业数据。
以下是我的实施
我的persistence.xml是：
<?xml version="1.0" encoding="UTF-8"?>
<persistence xmlns="http://xmlns.jcp.org/xml/ns/persistence" version="2.1">
<persistence-unit name="PersistenceUnit">
<!--<provider>org.hibernate.jpa.HibernatePersistenceProvider</provider>-->
<class>gr.histopath.platform.model.TransferObjects.BodyPart</class>
<class>gr.histopath.platform.model.TransferObjects.City</class>
<class>gr.histopath.platform.model.TransferObjects.Clinic</class>
<class>gr.histopath.platform.model.TransferObjects.Doctor</class>
<class>gr.histopath.platform.model.TransferObjects.Incident</class>
<class>gr.histopath.platform.model.TransferObjects.Patient</class>
<class>gr.histopath.platform.model.TransferObjects.SigningDoctor</class> <class>gr.histopath.platform.model.TransferObjects.Specialty</class>
<class>gr.histopath.platform.model.TransferObjects.User</class>
<properties>
<!--<property name="hibernate.hbm2ddl.auto" value="create"/>-->
<property name="hibernate.connection.url" value="jdbc:mysql://localhost:3306/histopath.gr?useSSL=false&useLegacyDatetimeCode=false&serverTimezone=Europe/Athens"/>
<property name="hibernate.connection.driver_class" value="com.mysql.jdbc.Driver"/>
<property name="hibernate.connection.username" value="histopathUser"/>
<!--<property name="hibernate.connection.username" value="root"/>-->
<property name="hibernate.connection.password" value="h1s+0p@+h"/>
<!--<property name="hibernate.connection.password" value="Malak1es"/>-->
<property name="hibernate.archive.autodetection" value="class"/>
<property name="hibernate.show_sql" value="true"/>
<property name="hibernate.format_sql" value="true"/>
<property name="hbm2ddl.auto" value="update"/>
<property name="hibernate.dialect" value="org.hibernate.dialect.MySQLDialect"/>
<property name="hibernate.connection.provider_class" value="org.hibernate.c3p0.internal.C3P0ConnectionProvider"/>
<property name="hibernate.connection.CharSet" value="utf8"/>
<property name="hibernate.connection.characterEncoding" value="utf8"/>
<property name="hibernate.connection.useUnicode" value="true"/>
<property name="connection.pool_size" value="1"/>
<!--<property name="hibernate.search.default.directory_provider" value="filesystem"/>-->
<!-- hibernate c3p0 connection pooling configuration -->
<property name="hibernate.c3p0.acquire_increment" value="1"/>
<property name="hibernate.c3p0.idle_test_period" value="60"/> <!-- seconds -->
<property name="hibernate.c3p0.min_size" value="5"/>
<property name="hibernate.c3p0.max_size" value="20"/>
<property name="hibernate.c3p0.max_statements" value="50"/>
<property name="hibernate.c3p0.timeout" value="0"/> <!-- seconds -->
<property name="hibernate.c3p0.acquireRetryAttempts" value="1"/>
<property name="hibernate.c3p0.acquireRetryDelay" value="250"/>
</properties>
</persistence-unit>
</persistence>
传输对象是：
City.java
package gr.histopath.platform.model.TransferObjects;
import com.fasterxml.jackson.annotation.JsonIgnore;
import javax.persistence.*;
import java.util.Collection;
import java.util.Objects;
@Entity
public class City {
private int id;
private String name;
private Collection<Doctor> doctors;
private Collection<Patient> patients;
@Id
@Column(name = "id")
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
@Basic
@Column(name = "name")
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
@Override
public boolean equals(Object o) {
if (this == o) return true;
if (o == null || getClass() != o.getClass()) return false;
City city = (City) o;
return id == city.id &&
Objects.equals(name, city.name);
}
@Override
public int hashCode() {
return Objects.hash(id, name);
}
@OneToMany(mappedBy = "city")
@JsonIgnore
public Collection<Doctor> getDoctors() {
return doctors;
}
public void setDoctors(Collection<Doctor> doctorsById) {
this.doctors = doctorsById;
}
@OneToMany(mappedBy = "city")
@JsonIgnore
public Collection<Patient> getPatients() {
return patients;
}
public void setPatients(Collection<Patient> patientsById) {
this.patients = patientsById;
}
}
Doctor.java
package gr.histopath.platform.model.TransferObjects;
import com.fasterxml.jackson.annotation.JsonIgnore;
import javax.persistence.*;
import java.util.Collection;
import java.util.Objects;
@Entity
public class Doctor {
private int id;
private String email;
private String fatherName;
private String firstName;
private String lastName;
private String telephone;
private City city;
private Specialty specialty;
private Collection<Incident> incidents;
@Id
@Column(name = "id")
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
@Basic
@Column(name = "email")
public String getEmail() {
return email;
}
public void setEmail(String email) {
this.email = email;
}
@Basic
@Column(name = "fatherName")
public String getFatherName() {
return fatherName;
}
public void setFatherName(String fatherName) {
this.fatherName = fatherName;
}
@Basic
@Column(name = "firstName")
public String getFirstName() {
return firstName;
}
public void setFirstName(String firstName) {
this.firstName = firstName;
}
@Basic
@Column(name = "lastName")
public String getLastName() {
return lastName;
}
public void setLastName(String lastName) {
this.lastName = lastName;
}
@Basic
@Column(name = "telephone")
public String getTelephone() {
return telephone;
}
public void setTelephone(String telephone) {
this.telephone = telephone;
}
@Override
public boolean equals(Object o) {
if (this == o) return true;
if (o == null || getClass() != o.getClass()) return false;
Doctor doctor = (Doctor) o;
return id == doctor.id &&
Objects.equals(email, doctor.email) &&
Objects.equals(fatherName, doctor.fatherName) &&
Objects.equals(firstName, doctor.firstName) &&
Objects.equals(lastName, doctor.lastName) &&
Objects.equals(telephone, doctor.telephone);
}
@Override
public int hashCode() {
return Objects.hash(id, email, fatherName, firstName, lastName, telephone, city, specialty);
}
@ManyToOne
@JoinColumn(name = "city_id", referencedColumnName = "id")
@JsonIgnore
public City getCity() {
return city;
}
public void setCity(City cityByCityId) {
this.city = cityByCityId;
}
@ManyToOne
@JoinColumn(name = "specialty_id", referencedColumnName = "id")
@JsonIgnore
public Specialty getSpecialty() {
return specialty;
}
public void setSpecialty(Specialty specialtyBySpecialtyId) {
this.specialty = specialtyBySpecialtyId;
}
@OneToMany(mappedBy = "doctor")
@JsonIgnore
public Collection<Incident> getIncidents() {
return incidents;
}
public void setIncidents(Collection<Incident> incidentsById) {
this.incidents = incidentsById;
}
}
Patient.java
package gr.histopath.platform.model.TransferObjects;
import com.fasterxml.jackson.annotation.JsonIgnore;
import javax.persistence.*;
import java.sql.Date;
import java.util.Collection;
import java.util.Objects;
@Entity
public class Patient {
private int id;
private Date birthday;
private String email;
private String fatherName;
private String firstName;
private String lastName;
private String telephone;
private Boolean sex;
private Collection<Incident> incidents;
private City city;
@Id
@Column(name = "id")
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
@Basic
@Column(name = "birthday")
public Date getBirthday() {
return birthday;
}
public void setBirthday(Date birthday) {
this.birthday = birthday;
}
@Basic
@Column(name = "email")
public String getEmail() {
return email;
}
public void setEmail(String email) {
this.email = email;
}
@Basic
@Column(name = "fatherName")
public String getFatherName() {
return fatherName;
}
public void setFatherName(String fatherName) {
this.fatherName = fatherName;
}
@Basic
@Column(name = "firstName")
public String getFirstName() {
return firstName;
}
public void setFirstName(String firstName) {
this.firstName = firstName;
}
@Basic
@Column(name = "lastName")
public String getLastName() {
return lastName;
}
public void setLastName(String lastName) {
this.lastName = lastName;
}
@Basic
@Column(name = "telephone")
public String getTelephone() {
return telephone;
}
public void setTelephone(String telephone) {
this.telephone = telephone;
}
@Basic
@Column(name = "sex")
public Boolean getSex() {
return sex;
}
public void setSex(Boolean sex) {
this.sex = sex;
}
@Override
public boolean equals(Object o) {
if (this == o) return true;
if (o == null || getClass() != o.getClass()) return false;
Patient patient = (Patient) o;
return id == patient.id &&
Objects.equals(birthday, patient.birthday) &&
Objects.equals(email, patient.email) &&
Objects.equals(fatherName, patient.fatherName) &&
Objects.equals(firstName, patient.firstName) &&
Objects.equals(lastName, patient.lastName) &&
Objects.equals(telephone, patient.telephone) &&
Objects.equals(sex, patient.sex) &&
Objects.equals(incidents, patient.incidents) &&
Objects.equals(city, patient.city);
}
@Override
public int hashCode() {
return Objects.hash(id, birthday, email, fatherName, firstName, lastName, telephone, sex, incidents, city);
}
@OneToMany(mappedBy = "patient")
@JsonIgnore
public Collection<Incident> getIncidents() {
return incidents;
}
public void setIncidents(Collection<Incident> incidentsById) {
this.incidents = incidentsById;
}
@ManyToOne
@JsonIgnore
@JoinColumn(name = "city_id", referencedColumnName = "id")
public City getCity() {
return city;
}
public void setCity(City cityByCityId) {
this.city = cityByCityId;
}
}
Specialty.java
package gr.histopath.platform.model.TransferObjects;
import com.fasterxml.jackson.annotation.JsonIgnore;
import javax.persistence.*;
import java.util.Collection;
import java.util.Objects;
@Entity
public class Specialty {
private int id;
private String name;
private Collection<Doctor> doctors;
@Id
@Column(name = "id")
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
@Basic
@Column(name = "name")
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
@Override
public boolean equals(Object o) {
if (this == o) return true;
if (o == null || getClass() != o.getClass()) return false;
Specialty specialty = (Specialty) o;
return id == specialty.id &&
Objects.equals(name, specialty.name);
}
@Override
public int hashCode() {
return Objects.hash(id, name);
}
@OneToMany(mappedBy = "specialty")
@JsonIgnore
public Collection<Doctor> getDoctors() {
return doctors;
}
public void setDoctors(Collection<Doctor> doctorsById) {
this.doctors = doctorsById;
}
}
任何想法为什么价值观不会被退回？值存在于数据库中，我可以在mysql工作台中查看它们，或者只是查询整个表。我忘记做某事吗？我认为我的错误将是荒谬的
答案 0 :(得分：0)
它是由@JsonIgnore注释引起的。在上面的例子中，我把它放在关系的两边（在@ManyToOne和@OneToMany中）。 通过从@ManyToOne端删除它并将其留在@OneToMany端来解决问题。
答案 1 :(得分：0)
你好解决了你的问题。我正在阅读你的问题，无法抗拒评论。
您应该重新访问您的域模型（关系）。使用当前的域模型，最终您将面临性能问题。
如果可能，请删除Specialty与Doctor之间的一对多关系;病人到事故;医生到事故和城市到医生，病人。
而是将Spcialty，Doctor，Patient和City作为主要实体（生命周期不依赖于其他实体。并保持以下关系：
不需要任何一对多的关系。
现在，如果您想要获取城市中的所有医生，请执行findAllByCity（城市）等活动。
当您创建事件时，您只需选择医生和患者并保存事件。无需从医生和患者那里级联。
最后一点：使用二级缓存。它将与数据库共享性能负担。