带分页的JPA连接

我使用的是SpingBoot2.4.5和SpringDataJPA（hibernate实现）

我有一个与下图非常相似的DB

我写了以下几个实体

实体模型类：

@Entity
@Table(name="ENTITY")
public class Entita {
    @Id
    @GeneratedValue(strategy=GenerationType.AUTO)
    @Column(name="ID_ENTITY")
    private UUID idEntity;
    @Column(name="ENTITY_NAME")
    private String entityName;
    @OneToMany
    private Set<EntityUser> owners;
    //Setter, getter, hashcode and equals
}

@Entity
@Table(name="USER")
public class User {
    @Id
    @GeneratedValue(strategy=GenerationType.AUTO)
    @Column(name="ID_USER")
    private UUID idUser;
    @Column(name="NAME")
    private String name;
    @Column(name="LAST_NAME")
    private String lastName;
    @OneToMany
    private Set<EntityUser> entities;
    @OneToMany
    private Set<UserRole> roles;
    //Setter, getter, hashcode and equals
}

@Entity
@Table(name="ENTITY_USER")
public class EntityUser {
    @EmbeddedId
    private EntityUserId pk;
    @ManyToOne(fetch = FetchType.LAZY)
    @MapsId("ID_ENTITY")
    @JoinColumn(name="ID_ENTITY")
    private Entita entity;
    @ManyToOne(fetch = FetchType.LAZY)
    @MapsId("ID_USER")
    @JoinColumn(name="ID_USER")
    private User user;
    //Setter, getter, hashcode and equals
}

@Embeddable
public class EntityUserId {
    @Column(name = "id_user")
    private UUID idUser;
    @Column(name = "id_entity")
    private UUID idEntity;
    //Setter, getter, hashcode and equals
}

@Entity
@Table(name="USER_ROLE")
public class UserRole {
    @EmbeddedId
    private UserRoleId pk;
    @ManyToOne(fetch = FetchType.LAZY)
    @MapsId("ID_USER")
    @JoinColumn(name="ID_USER")
    private User user;
    @ManyToOne(fetch = FetchType.LAZY)
    @MapsId("ID_ROLE")
    @JoinColumn(name="ID_ROLE") 
    private Role role;
    //Setter, getter, hashcode and equals
}

@Embeddable
public class UserRoleId {
    @Column(name = "id_user")
    private UUID idUser;
    @Column(name = "id_role")
    private UUID idRole;
    //Setter, getter, hashcode and equals
    
}

EntityUserId PK模型类：

@Entity
@Table(name="ENTITY")
public class Entita {
    @Id
    @GeneratedValue(strategy=GenerationType.AUTO)
    @Column(name="ID_ENTITY")
    private UUID idEntity;
    @Column(name="ENTITY_NAME")
    private String entityName;
    @OneToMany
    private Set<EntityUser> owners;
    //Setter, getter, hashcode and equals
}

@Entity
@Table(name="USER")
public class User {
    @Id
    @GeneratedValue(strategy=GenerationType.AUTO)
    @Column(name="ID_USER")
    private UUID idUser;
    @Column(name="NAME")
    private String name;
    @Column(name="LAST_NAME")
    private String lastName;
    @OneToMany
    private Set<EntityUser> entities;
    @OneToMany
    private Set<UserRole> roles;
    //Setter, getter, hashcode and equals
}

@Entity
@Table(name="ENTITY_USER")
public class EntityUser {
    @EmbeddedId
    private EntityUserId pk;
    @ManyToOne(fetch = FetchType.LAZY)
    @MapsId("ID_ENTITY")
    @JoinColumn(name="ID_ENTITY")
    private Entita entity;
    @ManyToOne(fetch = FetchType.LAZY)
    @MapsId("ID_USER")
    @JoinColumn(name="ID_USER")
    private User user;
    //Setter, getter, hashcode and equals
}

@Embeddable
public class EntityUserId {
    @Column(name = "id_user")
    private UUID idUser;
    @Column(name = "id_entity")
    private UUID idEntity;
    //Setter, getter, hashcode and equals
}

@Entity
@Table(name="USER_ROLE")
public class UserRole {
    @EmbeddedId
    private UserRoleId pk;
    @ManyToOne(fetch = FetchType.LAZY)
    @MapsId("ID_USER")
    @JoinColumn(name="ID_USER")
    private User user;
    @ManyToOne(fetch = FetchType.LAZY)
    @MapsId("ID_ROLE")
    @JoinColumn(name="ID_ROLE") 
    private Role role;
    //Setter, getter, hashcode and equals
}

@Embeddable
public class UserRoleId {
    @Column(name = "id_user")
    private UUID idUser;
    @Column(name = "id_role")
    private UUID idRole;
    //Setter, getter, hashcode and equals
    
}

榜样课程：

@Entity
@Table(name="ENTITY")
public class Entita {
    @Id
    @GeneratedValue(strategy=GenerationType.AUTO)
    @Column(name="ID_ENTITY")
    private UUID idEntity;
    @Column(name="ENTITY_NAME")
    private String entityName;
    @OneToMany
    private Set<EntityUser> owners;
    //Setter, getter, hashcode and equals
}

@Entity
@Table(name="USER")
public class User {
    @Id
    @GeneratedValue(strategy=GenerationType.AUTO)
    @Column(name="ID_USER")
    private UUID idUser;
    @Column(name="NAME")
    private String name;
    @Column(name="LAST_NAME")
    private String lastName;
    @OneToMany
    private Set<EntityUser> entities;
    @OneToMany
    private Set<UserRole> roles;
    //Setter, getter, hashcode and equals
}

@Entity
@Table(name="ENTITY_USER")
public class EntityUser {
    @EmbeddedId
    private EntityUserId pk;
    @ManyToOne(fetch = FetchType.LAZY)
    @MapsId("ID_ENTITY")
    @JoinColumn(name="ID_ENTITY")
    private Entita entity;
    @ManyToOne(fetch = FetchType.LAZY)
    @MapsId("ID_USER")
    @JoinColumn(name="ID_USER")
    private User user;
    //Setter, getter, hashcode and equals
}

@Embeddable
public class EntityUserId {
    @Column(name = "id_user")
    private UUID idUser;
    @Column(name = "id_entity")
    private UUID idEntity;
    //Setter, getter, hashcode and equals
}

@Entity
@Table(name="USER_ROLE")
public class UserRole {
    @EmbeddedId
    private UserRoleId pk;
    @ManyToOne(fetch = FetchType.LAZY)
    @MapsId("ID_USER")
    @JoinColumn(name="ID_USER")
    private User user;
    @ManyToOne(fetch = FetchType.LAZY)
    @MapsId("ID_ROLE")
    @JoinColumn(name="ID_ROLE") 
    private Role role;
    //Setter, getter, hashcode and equals
}

@Embeddable
public class UserRoleId {
    @Column(name = "id_user")
    private UUID idUser;
    @Column(name = "id_role")
    private UUID idRole;
    //Setter, getter, hashcode and equals
    
}

@实体 @表（name=“USER”）

用户角色ID PK模型类：

@Entity
@Table(name="ENTITY")
public class Entita {
    @Id
    @GeneratedValue(strategy=GenerationType.AUTO)
    @Column(name="ID_ENTITY")
    private UUID idEntity;
    @Column(name="ENTITY_NAME")
    private String entityName;
    @OneToMany
    private Set<EntityUser> owners;
    //Setter, getter, hashcode and equals
}

@Entity
@Table(name="USER")
public class User {
    @Id
    @GeneratedValue(strategy=GenerationType.AUTO)
    @Column(name="ID_USER")
    private UUID idUser;
    @Column(name="NAME")
    private String name;
    @Column(name="LAST_NAME")
    private String lastName;
    @OneToMany
    private Set<EntityUser> entities;
    @OneToMany
    private Set<UserRole> roles;
    //Setter, getter, hashcode and equals
}

@Entity
@Table(name="ENTITY_USER")
public class EntityUser {
    @EmbeddedId
    private EntityUserId pk;
    @ManyToOne(fetch = FetchType.LAZY)
    @MapsId("ID_ENTITY")
    @JoinColumn(name="ID_ENTITY")
    private Entita entity;
    @ManyToOne(fetch = FetchType.LAZY)
    @MapsId("ID_USER")
    @JoinColumn(name="ID_USER")
    private User user;
    //Setter, getter, hashcode and equals
}

@Embeddable
public class EntityUserId {
    @Column(name = "id_user")
    private UUID idUser;
    @Column(name = "id_entity")
    private UUID idEntity;
    //Setter, getter, hashcode and equals
}

@Entity
@Table(name="USER_ROLE")
public class UserRole {
    @EmbeddedId
    private UserRoleId pk;
    @ManyToOne(fetch = FetchType.LAZY)
    @MapsId("ID_USER")
    @JoinColumn(name="ID_USER")
    private User user;
    @ManyToOne(fetch = FetchType.LAZY)
    @MapsId("ID_ROLE")
    @JoinColumn(name="ID_ROLE") 
    private Role role;
    //Setter, getter, hashcode and equals
}

@Embeddable
public class UserRoleId {
    @Column(name = "id_user")
    private UUID idUser;
    @Column(name = "id_role")
    private UUID idRole;
    //Setter, getter, hashcode and equals
    
}

让我们假设：

我需要查询数据库，我需要搜索用户角色名为“所有者”的所有实体和用户

我需要服务器端分页和排序

我需要去掉以下所有属性：

3.1。entityName来自Entita

3.2。来自用户的name和lastname

假设有几个用户与一个实体相关

基本上，我应该使用JPA和QueryDSL编写类似的查询（带分页），并避免与多个关联相关的重复

select 
  e.ENTITY_NAME,
  u.NAME,
  u.LASTNAME
from
  entity e
join ENTITY_USER eu on eu.ID_ENTITY = e.ID_ENTITY
join USER u on u.ID_USER = eu.ID_USER
join USER_ROLE ur on ur.ID_USER = u.ID_USER
join ROLE r on r.ID_ROLE = ur.ID_ROLE
where
  r.ROLE_NAME = 'OWNER' 

通过避免N+1查询问题和避免加载数据的大量循环，执行查询的最佳方法是什么？ 我曾考虑使用

EntityGraph

，但我不确定这是否是最佳选择，也不确定创建参数化

EntityGraph

任何提示都欢迎