Discriminator列映射为实体Hibernate [英] Discriminator column mapped as entity Hibernate

问题描述

在hibernate中，是否有可能将鉴别器作为一个实体？例如，如果我将Department作为基类，管理部门& ProcessingDepartment作为子类。 DepartmentType是鉴别器&是一个映射到DEPT_TYPE表的实体。

解决方案

是的，尽管这样的关系是只读的， （$）
$ b $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $部门{
...
@ManyToOne
@JoinColumn（name =DEPT_TYPE_ID，可插入= false，可更新= false）
私人部门类型deptType;
...
}

In hibernate, is it possible to have discriminator as an entity? For example, if I have Department as the base class & AdminDepartment & ProcessingDepartment as subclasses. DepartmentType is the discriminator & is an entity mapped to DEPT_TYPE table.

解决方案

Yes, it's possible, though such a relationship will be read-only:

@Entity @Inheritence(...)
@DiscriminatorColumn(name = "DEPT_TYPE_ID")
public class Department {
    ...
    @ManyToOne
    @JoinColumn(name = "DEPT_TYPE_ID", insertable = false, updatable = false)
    private DepartmentType deptType;
    ...
}

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