Java 休眠@OneToMany不保存外键

我在保存一对多关系时遇到了问题。它似乎正在将列表中的元素保存到表中，但没有将外键保存到适当的表中

@Entity
@Table(name = "tbl_applications")
public class ApplicationEntity
{
    @OneToOne(cascade = CascadeType.ALL)
    @JoinColumn(name = "intAPI", referencedColumnName = "intCode")
    private ApiResourceEntity objApi;
    @OneToMany(cascade = CascadeType.ALL, mappedBy = "strApplication")
    List<ApplicationRoleEntity> colApplicationRoles = new ArrayList<ApplicationRoleEntity>();
    @OneToMany(cascade = CascadeType.ALL, mappedBy = "strApplication")
    List<URLEntity> colUrls = new ArrayList<URLEntity>();
    @OneToMany(cascade = CascadeType.ALL, mappedBy = "strApplication")
    List<KeyCredentialEntity> colKeyCredentials = new ArrayList<KeyCredentialEntity>();
    @OneToMany(cascade = CascadeType.ALL, mappedBy = "strApplication")
    List<PasswordCredentialEntity> colPasswordCredentials = new ArrayList<PasswordCredentialEntity>();
    @OneToMany(cascade = CascadeType.ALL, mappedBy = "strApplication")
    List<RequiredResourceAccessEntity> colRequiredResourceAccess = new ArrayList<RequiredResourceAccessEntity>();
}
@Entity
@Table(name = "tbl_apiresources")
public class ApiResourceEntity
{
    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    @Column(name = "intCode")
    private Integer intCode;
    private Integer intRequestedAccessTokenVersion;
    @OneToMany(cascade = CascadeType.ALL, mappedBy = "intCode")
    private List<PermissionScopeEntity> colOauth2PermissionsScope = new ArrayList<PermissionScopeEntity>();
}
@Entity
@Table(name = "tbl_permissionsscope")
public class PermissionScopeEntity
{
    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    @Column(name = "intCode")
    private Integer intCode;
    private String strAdminConsentDescription;
    private String strAdminConsentDisplayName;
    private String strID;
    private Boolean bolIsEnabled;
    private String strOrigin;
    private String strType;
    private String strUserConsentDescription;
    private String strUserConsentDisplayName;
    private String strValue;
}

它保存列表的元素（权限范围），但是外键不保存在表tbl_apiresources上。可能是因为标识符是一个标识字段（自行生成）

---

ApplicationEntity对象的所有@OneToMany关系都已正确保存@OneToMany不能指向@ManyToOne，因为我得到一个循环引用异常

当您仅指定一个

@OneToMany

关系，即从父对象到子对象的单向关系时，hibernate将使用联接表实现映射。保存父/子关系时，键将插入到联接表中：

@Entity
public class Parent {
    @Id
    @GeneratedValue(strategy=GenerationType.AUTO)
    private Long id;
    @OneToMany
    Set<Child> children;
}
@Entity
public class Child {
    @Id
    @GeneratedValue(strategy=GenerationType.AUTO)
    private Long id;
}

如果希望FK位于子表中，并且确实如此，请定义从子表到父表的单向映射

@Entity
public class Parent {
    @Id
    @GeneratedValue(strategy=GenerationType.AUTO)
    private Long id;
}
@Entity
public class Child {
    @Id
    @GeneratedValue(strategy=GenerationType.AUTO)
    private Long id;   
    @ManyToOne
    Parent parent;
}

它不创建联接表

Hibernate: create sequence hibernate_sequence start with 1 increment by 1
Hibernate: create table child (id bigint not null, parent_id bigint, primary key (id))
Hibernate: create table parent (id bigint not null, primary key (id))
Hibernate: alter table child add constraint FK7dag1cncltpyhoc2mbwka356h foreign key (parent_id) references parent
Hibernate: call next value for hibernate_sequence
Hibernate: insert into parent (id) values (?)
Hibernate: call next value for hibernate_sequence
Hibernate: insert into child (parent_id, id) values (?, ?)

如果您想要一个双向映射，那么可以同时添加这两个映射，但要理解，您应该像第二个示例一样执行持久化，并且仅出于性能原因，才可以使用父级

设置子级

@Entity
public class Parent {
    @Id
    @GeneratedValue(strategy=GenerationType.AUTO)
    private Long id;
    @OneToMany
    Set<Child> children;
}
@Entity
public class Child {
    @Id
    @GeneratedValue(strategy=GenerationType.AUTO)
    private Long id;

    @ManyToOne
    Parent parent;
}

---

请在下面找到我对代码所做的修改

@Entity
@Table(name = "tbl_applications")
public class ApplicationEntity
{
    @OneToOne(cascade = CascadeType.ALL)
    @JoinColumn(name = "intAPI", referencedColumnName = "intCode")
    private ApiResourceEntity objApi;
    @OneToMany(cascade = CascadeType.ALL, mappedBy = "strApplication")
    List<ApplicationRoleEntity> colApplicationRoles = new ArrayList<ApplicationRoleEntity>();
    @OneToMany(cascade = CascadeType.ALL, mappedBy = "strApplication")
    List<URLEntity> colUrls = new ArrayList<URLEntity>();
    @OneToMany(cascade = CascadeType.ALL, mappedBy = "strApplication")
    List<KeyCredentialEntity> colKeyCredentials = new ArrayList<KeyCredentialEntity>();
    @OneToMany(cascade = CascadeType.ALL, mappedBy = "strApplication")
    List<PasswordCredentialEntity> colPasswordCredentials = new ArrayList<PasswordCredentialEntity>();
    @OneToMany(cascade = CascadeType.ALL, mappedBy = "strApplication")
    List<RequiredResourceAccessEntity> colRequiredResourceAccess = new ArrayList<RequiredResourceAccessEntity>();
}
@Entity
@Table(name = "tbl_apiresources")
public class ApiResourceEntity
{
    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    @Column(name = "intCode")
    private Integer intCode;
    private Integer intRequestedAccessTokenVersion;
    @OneToMany(cascade = CascadeType.ALL, mappedBy = "intCode")
    private List<PermissionScopeEntity> colOauth2PermissionsScope = new ArrayList<PermissionScopeEntity>();
}
@Entity
@Table(name = "tbl_permissionsscope")
public class PermissionScopeEntity
{
    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    @Column(name = "intCode")
    private Integer intCode;
    private String strAdminConsentDescription;
    private String strAdminConsentDisplayName;
    private String strID;
    private Boolean bolIsEnabled;
    private String strOrigin;
    private String strType;
    private String strUserConsentDescription;
    private String strUserConsentDisplayName;
    private String strValue;
    @ManyToOne
    private ApiResourceEntity objApi;
}

当我添加cascade=CascadeType.ALL时，我得到了以下错误：

org.hibernate.engine.jdbc.spi.SqlExceptionHelper-列名无效 “objApi_内部代码”

---

有无mappedBy=“intCode”

可能是因为您正在使用私有列表coloauth2permissionscope=new ArrayList（）初始化列表哪个fk保存在错误的表中？如果您是指

列表的fk

如何将fk列表保存在列中？mappedBy属性必须指向多通关系mappedBy必须具有相应的

多通

映射，它指定了关系所属方的外键列。您对@OneToMany的意思是什么？不能指向@ManyTone因为我得到一个循环引用异常，所以绝对可以创建一个双向关系，请分享您如何尝试实现该功能的代码HI：如果我在父项上使用OneToMany，在子项上使用ManyToOne，则会显示以下异常。java.lang.IllegalStateException:org.hibernate.TransientObject异常：瞬态实例上的对象循环引用-瞬态实例上的循环引用：azure.entities.PermissionScopeEntity该异常与onetomany和manytoone无关，它只意味着事务中有一个实体尚未保存，确保保存所有实体或使用级联保存相关实体，如果您共享导致出现此异常的代码，我可以帮助您

@Entity
public class Parent {
    @Id
    @GeneratedValue(strategy=GenerationType.AUTO)
    private Long id;
    @OneToMany
    Set<Child> children;
}
@Entity
public class Child {
    @Id
    @GeneratedValue(strategy=GenerationType.AUTO)
    private Long id;

    @ManyToOne
    Parent parent;
}

"from Parent p left outer join fetch p.children where p.id = :id"

@Entity
@Table(name = "tbl_applications")
public class ApplicationEntity
{
    @OneToOne(cascade = CascadeType.ALL)
    @JoinColumn(name = "intAPI", referencedColumnName = "intCode")
    private ApiResourceEntity objApi;
    @OneToMany(cascade = CascadeType.ALL, mappedBy = "strApplication")
    List<ApplicationRoleEntity> colApplicationRoles = new ArrayList<ApplicationRoleEntity>();
    @OneToMany(cascade = CascadeType.ALL, mappedBy = "strApplication")
    List<URLEntity> colUrls = new ArrayList<URLEntity>();
    @OneToMany(cascade = CascadeType.ALL, mappedBy = "strApplication")
    List<KeyCredentialEntity> colKeyCredentials = new ArrayList<KeyCredentialEntity>();
    @OneToMany(cascade = CascadeType.ALL, mappedBy = "strApplication")
    List<PasswordCredentialEntity> colPasswordCredentials = new ArrayList<PasswordCredentialEntity>();
    @OneToMany(cascade = CascadeType.ALL, mappedBy = "strApplication")
    List<RequiredResourceAccessEntity> colRequiredResourceAccess = new ArrayList<RequiredResourceAccessEntity>();
}
@Entity
@Table(name = "tbl_apiresources")
public class ApiResourceEntity
{
    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    @Column(name = "intCode")
    private Integer intCode;
    private Integer intRequestedAccessTokenVersion;
    @OneToMany(cascade = CascadeType.ALL, mappedBy = "intCode")
    private List<PermissionScopeEntity> colOauth2PermissionsScope = new ArrayList<PermissionScopeEntity>();
}
@Entity
@Table(name = "tbl_permissionsscope")
public class PermissionScopeEntity
{
    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    @Column(name = "intCode")
    private Integer intCode;
    private String strAdminConsentDescription;
    private String strAdminConsentDisplayName;
    private String strID;
    private Boolean bolIsEnabled;
    private String strOrigin;
    private String strType;
    private String strUserConsentDescription;
    private String strUserConsentDisplayName;
    private String strValue;
    @ManyToOne
    private ApiResourceEntity objApi;
}

java.lang.IllegalStateException: org.hibernate.TransientObjectException: object circular reference on transient instance - circular reference on transient instance: azure.entities.PermissionScopeEntity