Spring 启动并 mySQL 获取一对多关系的请求
Spring boot and mySQL get request for one to many relationship
我在 mySQL、用户、机构和角色
中有 3 个 table
- 用户与机构的一对多关系（一个用户可以在一个机构工作，一个机构可以有多个用户）
我的数据库中的机构已经插入，用户只能在特定的现有机构工作。
我为用户和机构手动添加了 2 条记录到我的数据库。
但是当我发送 getAllUsers 或 getAllInstitutions 请求时，我得到以下 json 正文，这是一个无限循环。
------------用户模型--------
@Getter
@Setter
@NoArgsConstructor
@AllArgsConstructor
@ToString
@Entity
@Table(name = "user")
public class User {
@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
@Column(name="user_Id")
private int userId;
@Column(name="name")
private String name;
@Column(name="lastname")
private String lastname;
@Column(name="email")
private String email;
@Column(name="password")
private String password;
@Column(name="isActive")
private boolean isActive;
@Column(name="lastActive")
private String lastActive;
@Column(name="createdDate")
private String createdDate;
@Column(name="isBlocked")
private boolean isBlocked;
@ManyToOne(fetch = FetchType.LAZY, optional = false)
@JoinColumn(name = "institution_id", nullable = false)
private Institution institution;
@ManyToMany(fetch = FetchType.LAZY, cascade = CascadeType.PERSIST)
@JoinTable(name = "user_has_role",
joinColumns = {
@JoinColumn(name = "user_id", referencedColumnName = "user_id",
nullable = false, updatable = true)},
inverseJoinColumns = {
@JoinColumn(name = "role_id", referencedColumnName = "role_id",
nullable = false, updatable = true)})
private Set<Role> roles = new HashSet<>();
}
--------机构模型------------
@Getter
@Setter
@NoArgsConstructor
@AllArgsConstructor
@ToString
@Entity
@Table(name = "institution")
public class Institution {
@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
@Column(name="institution_Id")
private int institutionId;
@Column(name="name")
private String name;
@Column(name="type")
private String type;
@Column(name="location")
private String location;
@OneToMany(mappedBy = "institution", fetch = FetchType.LAZY)
private Set<User> user;
}
------------榜样---------
@Getter
@Setter
@NoArgsConstructor
@AllArgsConstructor
@ToString
@Entity
@Table(name = "role")
public class Role {
@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
@Column(name="role_Id")
private int roleId;
@Column(name="name")
private String name;
@Column(name="description")
private String description;
@ManyToMany(mappedBy = "roles", fetch = FetchType.LAZY)
private Set<User> users = new HashSet<>();
}
--------控制器------------
@GetMapping("/getAllUsers")
public List<User> getAllUsers() {
return (List<User>) userrepository.findAll();
}
@PostMapping("/addUser")
public String addUser(@RequestBody User user) {
userrepository.save(user);
return "role saved with name: " + user.getName();
}
@GetMapping("/getAllInstitutions")
public List<Institution> getAllInstitutions() {
return (List<Institution>) institutionrepository.findAll();
}
@PostMapping("/addInstitution")
public String addInstitution(@RequestBody Institution institution) {
institutionrepository.save(institution);
return "institution saved with name: " + institution.getName();
}
------------getAllInstitutions的api请求体循环错误----------------
[
{
"institutionId": 1,
"name": "Bank Byblos",
"type": "Bank",
"location": "sen el fil",
"user": [
{
"userId": 3,
"name": "user1",
"lastname": "testtest",
"email": "user1@hotmail.com",
"password": "user1123",
"lastActive": "11/11/21",
"createdDate": "06/05/20",
"institution": {
"institutionId": 1,
"name": "Bank Byblos",
"type": "Bank",
"location": "sen el fil",
"user": [
{
"userId": 3,
"name": "user1",
"lastname": "testtest",
"email": "user1@hotmail.com",
"password": "user1123",
"lastActive": "11/11/21",
"createdDate": "06/05/20",
"institution": {
"institutionId": 1,
"name": "Bank Byblos",
"type": "Bank",
"location": "sen el fil",
"user": [
{
"userId": 3,
"name": "user1",
"lastname": "testtest",
"email": "user1@hotmail.com",
"password": "user1123",
"lastActive": "11/11/21",
"createdDate": "06/05/20",
"institution": {
"institutionId": 1,
"name": "Bank Byblos",
"type": "Bank",
"location": "sen el fil",
"user": [
{
"userId": 3,
"name": "user1",
"lastname": "testtest",
"email": "user1@hotmail.com",
"password": "user1123",
"lastActive": "11/11/21",
"createdDate": "06/05/20",
"institution": {
"institutionId": 1,
"name": "Bank Byblos",
"type": "Bank",
"location": "sen el fil",
"user": [
{
"userId": 3,
"name": "user1",
"lastname": "testtest",
"email": "user1@hotmail.com",
"password": "user1123",
"lastActive": "11/11/21",
"createdDate": "06/05/20",
"institution": {
"institutionId": 1,
"name": "Bank Byblos",
"type": "Bank",
"location": "sen el fil",
"user": [
{
"userId": 3,
"name": "user1",
"lastname": "testtest",
"email": "user1@hotmail.com",
"password": "user1123",
"lastActive": "11/11/21",
"createdDate": "06/05/20",
"institution": {
"institutionId": 1,
"name": "Bank Byblos",
"type": "Bank",
"location": "sen el fil",
"user": [
{
------------getAllÙsers的api请求体循环错误----------------
[
{
"userId": 3,
"name": "user1",
"lastname": "testtest",
"email": "user1@hotmail.com",
"password": "user1123",
"lastActive": "11/11/21",
"createdDate": "06/05/20",
"institution": {
"institutionId": 1,
"name": "Bank Byblos",
"type": "Bank",
"location": "sen el fil",
"user": [
{
"userId": 3,
"name": "user1",
"lastname": "testtest",
"email": "user1@hotmail.com",
"password": "user1123",
"lastActive": "11/11/21",
"createdDate": "06/05/20",
"institution": {
"institutionId": 1,
"name": "Bank Byblos",
"type": "Bank",
"location": "sen el fil",
"user": [
{
"userId": 3,
"name": "user1",
"lastname": "testtest",
"email": "user1@hotmail.com",
"password": "user1123",
"lastActive": "11/11/21",
"createdDate": "06/05/20",
"institution": {
"institutionId": 1,
"name": "Bank Byblos",
"type": "Bank",
"location": "sen el fil",
"user": [
{
"userId": 3,
"name": "user1",
"lastname": "testtest",
"email": "user1@hotmail.com",
"password": "user1123",
"lastActive": "11/11/21",
"createdDate": "06/05/20",
"institution": {
"institutionId": 1,
"name": "Bank Byblos",
"type": "Bank",
"location": "sen el fil",
"user": [
{
"userId": 3,
"name": "user1",
"lastname": "testtest",
"email": "user1@hotmail.com",
"password": "user1123",
"lastActive": "11/11/21",
"createdDate": "06/05/20",
"institution": {
"institutionId": 1,
"name": "Bank Byblos",
"type": "Bank",
"location": "sen el fil",
"user": [
{
"userId": 3,
"name": "user1",
"lastname": "testtest",
"email": "user1@hotmail.com",
"password": "user1123",
"lastActive": "11/11/21",
"createdDate": "06/05/20",
"institution": {
"institutionId": 1,
"name": "Bank Byblos",
"type": "Bank",
"location": "sen el fil",
"user": [
我有2个用户添加到我的数据库 user1 和 user2 ，还有2个机构添加到我的数据库 user1 属于一个， user2 属于另一个（使用外键 institution_id in user table)
你能帮我解决一下吗？
尝试修改您的代码如下：
@Getter
@Setter
@NoArgsConstructor
@AllArgsConstructor
@ToString
@Entity
@Table(name = "institution")
public class Institution {
@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
@Column(name="institution_Id")
private int institutionId;
@Column(name="name")
private String name;
@Column(name="type")
private String type;
@Column(name="location")
private String location;
@OneToMany(mappedBy = "institution", fetch = FetchType.LAZY)
@JsonIgnoreProperties(value = {"institution"})
private Set<User> user;
}
使用 @JsonIgnoreProperties 注释忽略 属性 用户在您的 Institution 模型中的设置。
现在不会循环了，因为获取机构数据时不会获取机构。
也尝试在您的 User 模型中添加 @JsonIgnoreProperties，它应该可以解决您的问题。
@Getter
@Setter
@NoArgsConstructor
@AllArgsConstructor
@ToString
@Entity
@Table(name = "user")
public class User {
@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
@Column(name="user_Id")
private int userId;
@Column(name="name")
private String name;
@Column(name="lastname")
private String lastname;
@Column(name="email")
private String email;
@Column(name="password")
private String password;
@Column(name="isActive")
private boolean isActive;
@Column(name="lastActive")
private String lastActive;
@Column(name="createdDate")
private String createdDate;
@Column(name="isBlocked")
private boolean isBlocked;
@ManyToOne(fetch = FetchType.LAZY, optional = false)
@JoinColumn(name = "institution_id", nullable = false)
@JsonIgnoreProperties(value = {"user"})
private Institution institution;
@ManyToMany(fetch = FetchType.LAZY, cascade = CascadeType.PERSIST)
我在 mySQL、用户、机构和角色
中有 3 个 table- 用户与机构的一对多关系（一个用户可以在一个机构工作，一个机构可以有多个用户）
我的数据库中的机构已经插入，用户只能在特定的现有机构工作。
我为用户和机构手动添加了 2 条记录到我的数据库。
但是当我发送 getAllUsers 或 getAllInstitutions 请求时，我得到以下 json 正文，这是一个无限循环。
------------用户模型--------
@Getter
@Setter
@NoArgsConstructor
@AllArgsConstructor
@ToString
@Entity
@Table(name = "user")
public class User {
@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
@Column(name="user_Id")
private int userId;
@Column(name="name")
private String name;
@Column(name="lastname")
private String lastname;
@Column(name="email")
private String email;
@Column(name="password")
private String password;
@Column(name="isActive")
private boolean isActive;
@Column(name="lastActive")
private String lastActive;
@Column(name="createdDate")
private String createdDate;
@Column(name="isBlocked")
private boolean isBlocked;
@ManyToOne(fetch = FetchType.LAZY, optional = false)
@JoinColumn(name = "institution_id", nullable = false)
private Institution institution;
@ManyToMany(fetch = FetchType.LAZY, cascade = CascadeType.PERSIST)
@JoinTable(name = "user_has_role",
joinColumns = {
@JoinColumn(name = "user_id", referencedColumnName = "user_id",
nullable = false, updatable = true)},
inverseJoinColumns = {
@JoinColumn(name = "role_id", referencedColumnName = "role_id",
nullable = false, updatable = true)})
private Set<Role> roles = new HashSet<>();
}
--------机构模型------------
@Getter
@Setter
@NoArgsConstructor
@AllArgsConstructor
@ToString
@Entity
@Table(name = "institution")
public class Institution {
@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
@Column(name="institution_Id")
private int institutionId;
@Column(name="name")
private String name;
@Column(name="type")
private String type;
@Column(name="location")
private String location;
@OneToMany(mappedBy = "institution", fetch = FetchType.LAZY)
private Set<User> user;
}
------------榜样---------
@Getter
@Setter
@NoArgsConstructor
@AllArgsConstructor
@ToString
@Entity
@Table(name = "role")
public class Role {
@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
@Column(name="role_Id")
private int roleId;
@Column(name="name")
private String name;
@Column(name="description")
private String description;
@ManyToMany(mappedBy = "roles", fetch = FetchType.LAZY)
private Set<User> users = new HashSet<>();
}
--------控制器------------
@GetMapping("/getAllUsers")
public List<User> getAllUsers() {
return (List<User>) userrepository.findAll();
}
@PostMapping("/addUser")
public String addUser(@RequestBody User user) {
userrepository.save(user);
return "role saved with name: " + user.getName();
}
@GetMapping("/getAllInstitutions")
public List<Institution> getAllInstitutions() {
return (List<Institution>) institutionrepository.findAll();
}
@PostMapping("/addInstitution")
public String addInstitution(@RequestBody Institution institution) {
institutionrepository.save(institution);
return "institution saved with name: " + institution.getName();
}
------------getAllInstitutions的api请求体循环错误----------------
[
{
"institutionId": 1,
"name": "Bank Byblos",
"type": "Bank",
"location": "sen el fil",
"user": [
{
"userId": 3,
"name": "user1",
"lastname": "testtest",
"email": "user1@hotmail.com",
"password": "user1123",
"lastActive": "11/11/21",
"createdDate": "06/05/20",
"institution": {
"institutionId": 1,
"name": "Bank Byblos",
"type": "Bank",
"location": "sen el fil",
"user": [
{
"userId": 3,
"name": "user1",
"lastname": "testtest",
"email": "user1@hotmail.com",
"password": "user1123",
"lastActive": "11/11/21",
"createdDate": "06/05/20",
"institution": {
"institutionId": 1,
"name": "Bank Byblos",
"type": "Bank",
"location": "sen el fil",
"user": [
{
"userId": 3,
"name": "user1",
"lastname": "testtest",
"email": "user1@hotmail.com",
"password": "user1123",
"lastActive": "11/11/21",
"createdDate": "06/05/20",
"institution": {
"institutionId": 1,
"name": "Bank Byblos",
"type": "Bank",
"location": "sen el fil",
"user": [
{
"userId": 3,
"name": "user1",
"lastname": "testtest",
"email": "user1@hotmail.com",
"password": "user1123",
"lastActive": "11/11/21",
"createdDate": "06/05/20",
"institution": {
"institutionId": 1,
"name": "Bank Byblos",
"type": "Bank",
"location": "sen el fil",
"user": [
{
"userId": 3,
"name": "user1",
"lastname": "testtest",
"email": "user1@hotmail.com",
"password": "user1123",
"lastActive": "11/11/21",
"createdDate": "06/05/20",
"institution": {
"institutionId": 1,
"name": "Bank Byblos",
"type": "Bank",
"location": "sen el fil",
"user": [
{
"userId": 3,
"name": "user1",
"lastname": "testtest",
"email": "user1@hotmail.com",
"password": "user1123",
"lastActive": "11/11/21",
"createdDate": "06/05/20",
"institution": {
"institutionId": 1,
"name": "Bank Byblos",
"type": "Bank",
"location": "sen el fil",
"user": [
{
------------getAllÙsers的api请求体循环错误----------------
[
{
"userId": 3,
"name": "user1",
"lastname": "testtest",
"email": "user1@hotmail.com",
"password": "user1123",
"lastActive": "11/11/21",
"createdDate": "06/05/20",
"institution": {
"institutionId": 1,
"name": "Bank Byblos",
"type": "Bank",
"location": "sen el fil",
"user": [
{
"userId": 3,
"name": "user1",
"lastname": "testtest",
"email": "user1@hotmail.com",
"password": "user1123",
"lastActive": "11/11/21",
"createdDate": "06/05/20",
"institution": {
"institutionId": 1,
"name": "Bank Byblos",
"type": "Bank",
"location": "sen el fil",
"user": [
{
"userId": 3,
"name": "user1",
"lastname": "testtest",
"email": "user1@hotmail.com",
"password": "user1123",
"lastActive": "11/11/21",
"createdDate": "06/05/20",
"institution": {
"institutionId": 1,
"name": "Bank Byblos",
"type": "Bank",
"location": "sen el fil",
"user": [
{
"userId": 3,
"name": "user1",
"lastname": "testtest",
"email": "user1@hotmail.com",
"password": "user1123",
"lastActive": "11/11/21",
"createdDate": "06/05/20",
"institution": {
"institutionId": 1,
"name": "Bank Byblos",
"type": "Bank",
"location": "sen el fil",
"user": [
{
"userId": 3,
"name": "user1",
"lastname": "testtest",
"email": "user1@hotmail.com",
"password": "user1123",
"lastActive": "11/11/21",
"createdDate": "06/05/20",
"institution": {
"institutionId": 1,
"name": "Bank Byblos",
"type": "Bank",
"location": "sen el fil",
"user": [
{
"userId": 3,
"name": "user1",
"lastname": "testtest",
"email": "user1@hotmail.com",
"password": "user1123",
"lastActive": "11/11/21",
"createdDate": "06/05/20",
"institution": {
"institutionId": 1,
"name": "Bank Byblos",
"type": "Bank",
"location": "sen el fil",
"user": [
我有2个用户添加到我的数据库 user1 和 user2 ，还有2个机构添加到我的数据库 user1 属于一个， user2 属于另一个（使用外键 institution_id in user table) 你能帮我解决一下吗？
尝试修改您的代码如下：
@Getter
@Setter
@NoArgsConstructor
@AllArgsConstructor
@ToString
@Entity
@Table(name = "institution")
public class Institution {
@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
@Column(name="institution_Id")
private int institutionId;
@Column(name="name")
private String name;
@Column(name="type")
private String type;
@Column(name="location")
private String location;
@OneToMany(mappedBy = "institution", fetch = FetchType.LAZY)
@JsonIgnoreProperties(value = {"institution"})
private Set<User> user;
}
使用 @JsonIgnoreProperties 注释忽略 属性 用户在您的 Institution 模型中的设置。
现在不会循环了，因为获取机构数据时不会获取机构。
也尝试在您的 User 模型中添加 @JsonIgnoreProperties，它应该可以解决您的问题。
@Getter
@Setter
@NoArgsConstructor
@AllArgsConstructor
@ToString
@Entity
@Table(name = "user")
public class User {
@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
@Column(name="user_Id")
private int userId;
@Column(name="name")
private String name;
@Column(name="lastname")
private String lastname;
@Column(name="email")
private String email;
@Column(name="password")
private String password;
@Column(name="isActive")
private boolean isActive;
@Column(name="lastActive")
private String lastActive;
@Column(name="createdDate")
private String createdDate;
@Column(name="isBlocked")
private boolean isBlocked;
@ManyToOne(fetch = FetchType.LAZY, optional = false)
@JoinColumn(name = "institution_id", nullable = false)
@JsonIgnoreProperties(value = {"user"})
private Institution institution;
@ManyToMany(fetch = FetchType.LAZY, cascade = CascadeType.PERSIST)