未映射休眠表

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);
}
}

此实体的超类

@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;
}
}

第二超级舱

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

我有这 2 种方法，首先 - 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();
}

第二个用于获取要 hql 的实体名称

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，我有错误

[error] c.i.SomeMethod- Error： org.hibernate.hql.internal.ast.QuerySyntaxException： SomeEntity is not mapping [FROM SomeEntity E WHERE E.first = ：first AND E.second = ：second]

Answer 1

是否已定义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hibernate.cfg.xml中定义它

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