java - Hibernate 表未映射

Question

我有实体

@Entity
@Table(
        name = SomeEntity.TABLE_NAME,
        uniqueConstraints = {@UniqueConstraint(columnNames = {"first", "second"})}
)
public class SomeEntity extends SomeSuperEntity {
    public static final String TABLE_NAME = "SomeEntity";

    public SomeEntity() {
    }

    public SomeEntity(String first, String second, Integer third) {
        super(first, second, third);
    }
}

该实体的父类(super class)

@MappedSuperclass
public abstract class SomeSuperEntity extends SomeSuperAbstractEntity {
    @Column(nullable = false)
    private String first;
    @Column(nullable = false)
    private String second;

    protected SomeSuperEntity () {
    }

    protected SomeSuperEntity (String first, String second, Integer third) {
        super(third);
        this.first= first;
        this.second= second;
    }
}

第二个 super 类

@MappedSuperclass
public abstract class SomeSuperAbstractEntity {
    @Column(nullable = false)
    private Integer third;

    protected SomeSuperAbstractEntity () {
    }

    protected SomeSuperAbstractEntity (Integer third) {
        this.third= third;
    }
}

我有这两种方法，第一个 - 用于查找实体

public <T extends SomeSuperEntity > Optional<T> findByFirstAndSecond(String first, String second, Class<T> tClass) {
        String hql = String.format("FROM %s E WHERE E.first = :first AND E.second = :second", getTable(tClass));
        return jpaApi.em().createQuery(hql, tClass)
                .setParameter("first", first)
                .setParameter("second", second)
                .getResultList().stream().findAny();
    }

第二个用于获取实体名称到 hql

private String getTable(Class<? extends SomeSuperEntity > tClass) {
    if (tClass.equals(SomeEntity .class)) {
        return SomeEntity.TABLE_NAME;
    }
    return null;
}

当我尝试调用 findByFirstAndSecond("1", "2", SomeEntity.class) 时，出现错误

[错误] c.i.SomeMethod- 错误:org.hibernate.hql.internal.ast.QuerySyntaxException:SomeEntity 未映射 [FROM SomeEntity E WHERE E.first = :first AND E.second = :second]

Answer 1

您是否定义了要在应用程序上下文中扫描的包？

<property name="packagesToScan">
<list>
    <value>com.package_to_someentity</value>
</list>
</property>

或者，在您的 hibernate.cfg.xml 中定义它

<hibernate-configuration>
<session-factory>
   <mapping class="com.package_to_someentity.SomeEntity" />
</session-factory>
</hibernate-configuration>