Java 为什么Hibernate在save（）上连接不相关的实体
在我的Spring Boot 2.1.8项目中，我有以下实体：Java 为什么Hibernate在save（）上连接不相关的实体,java,hibernate,spring-boot,jpa,Java,Hibernate,Spring Boot,Jpa,在我的Spring Boot 2.1.8项目中，我有以下实体： @Entity @Table(name = "teacher") @Where(clause = "active = true") class TeacherEntity { @Id @Column(name = "id") public String id; @Basic @Column(name = "active") public boolean active; @Basic @Column
@Entity
@Table(name = "teacher")
@Where(clause = "active = true")
class TeacherEntity {
@Id
@Column(name = "id")
public String id;
@Basic
@Column(name = "active")
public boolean active;
@Basic
@Column(name = "name")
public String name;
}
@Entity
@Table(name = "course")
class CourseEntity {
@Id
@Column(name = "id")
public int id;
@ManyToOne
@JoinColumn(name = "course_id")
public TeacherEntity teacher;
}
@Entity
@Table(name = "seat")
class SeatEntity {
@Id
@Column(name = "id")
public int id;
@ManyToOne
@JoinColumn(name = "parent_id")
public CourseEntity course;
@Basic
@Column(name = "blabla")
public String blabla;
}
blablapublic void updateSeats() {
List<SeatEntity> seats = seatRepository.findAllBy____();
seats.forEach(seat -> {
seat.blabla = "new blabla!";
seat = seatRepository.save(seat); // Exception if Teacher.active = false!
});
}
public void updateSeats（）{
List seats=seatRepository.findAllBy____;（）；
座位。forEach（座位->{
seat.blabla=“新建blabla！”；
seat=seatRepository.save（seat）；//Teacher.active=false时异常！
});
}
为什么Hibernate抱怨加载一个两个连接的表，而这个表与我试图保存的数据无关？这个问题的解决方案是什么？我是否需要编写本机更新查询来避开无意义的连接并保存数据？事实证明，问题是通过将方法包装到事务中解决的：
@Transactional
public void updateSeats() {
// same code as above
}
通过在同一事务中加载和保存，Hibernate不再尝试重新加载整个实体图。与您试图保存的数据无关？你的
seantityCourseEntityTeacherEntity@Where@Where座位更新席位…其中id=xxx