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在我的 Users.entity 中使用多个 @OneToMany 条目时，Hibernate 崩溃，我不明白为什么。

我有一个用户表（主键 userID）和各种其他表，它们通过数据库中设置的外键（InnoDB 集和外键在每个依赖表中设置）引用主键 userID。

这是一个包含三个表的示例：

表用户：

CREATE TABLE `users` (`userID` int(11) NOT NULL) ENGINE=InnoDB DEFAULT CHARSET=latin1; 
ALTER TABLE `users` ADD PRIMARY KEY (`userID`);

表：假期请求

CREATE TABLE `vacationrequests` (`requestID` int(11) NOT NULL,`userID` int(4) NOT NULL,) ENGINE=InnoDB DEFAULT CHARSET=latin1;
ALTER TABLE `vacationrequests` ADD CONSTRAINT `userID` FOREIGN KEY (`userID`) REFERENCES `users` (`userID`) ON UPDATE CASCADE; COMMIT;

表月结：

CREATE TABLE `monthend` (`monthendID` int(11) NOT NULL,`userID` int(4) NOT NULL,) ENGINE=InnoDB DEFAULT CHARSET=latin1;

实体用户：

@Entity
@Table(name="users")

public class Users {

@Id
@GeneratedValue(strategy=GenerationType.IDENTITY)
@Column(name="userID")
private int userID;

... .... (other variables)

@OneToMany(fetch = FetchType.LAZY, mappedBy="monthend")
private Set<Monthend> monthend;

@OneToMany(fetch = FetchType.LAZY, mappedBy="vacationrequests")
private Set<Vacationrequests> vacationrequests;

public Users() {

}

实体假期请求：

@Entity
@Table(name="vacationrequests")

public class Vacationrequests {

@Id
@GeneratedValue(strategy=GenerationType.IDENTITY)
@Column(name="requestID")
private int requestID;

... .... (other variables)

@ManyToOne(fetch = FetchType.LAZY)
@JoinColumn(name="userID", nullable = false)
private Users users;

public Vacationrequests() {

}

实体月刊：

@Entity
@Table(name="monthend")

public class Monthend {

@Id
@GeneratedValue(strategy=GenerationType.IDENTITY)
@Column(name="monthendID")
private int monthendID;

@ManyToOne(fetch = FetchType.LAZY)
@JoinColumn(name="userID", nullable = false)
private Users users;

@Column(name="clientID")
private int clientID;

@Column(name="month")
private int month;

@Column(name="year")
private int year;

@Column(name="monthend")
private int monthend;

public Monthend() {

}

工作查询：

List<Object> listJoinUsersMonthend = session.createQuery("from Monthend m inner join m.users as users where m.clientID = :clientID AND m.year = :year AND users.loginclass = 0 AND users.isactive = 1 AND m.monthend = 0 AND m.month < :month order by users.userID asc")
                        .setInteger("clientID", user.getClientID())
                        .setInteger("year", year)
                        .setInteger("month", month)
                        .getResultList();

我想整合第二个查询：

List<Object> listJoinVacationrequestsUsers = session.createQuery("from Vacationrequests v inner join v.users as users where v.clientID = :clientID AND v.approved=0 AND v.vacationtype=1 AND YEAR(v.startdate) = :year" )
                        .setInteger("clientID", user.getClientID())
                        .setInteger("year", year)
                        .getResultList();

只需一个查询和 Users.entity 中的一个条目，一切都可以正常工作。一旦我添加了这两个条目，休眠就会崩溃并且没有错误消息。不能在一个实体中做两个@OneToMany 语句吗？

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1 回答 1

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似乎问题在于用户实体中的关联映射。您应该更改关联的mappedBy属性以指定引用关联实体中当前实体的字段名称（在本例中为users），如下所示：

@OneToMany(fetch = FetchType.LAZY, mappedBy = "users")
private Set<Monthend> monthend;

@OneToMany(fetch = FetchType.LAZY, mappedBy = "users")
private Set<Vacationrequests> vacationrequests;
于 2018-08-27T12:10:32.070 回答