Java 使用CriteriaBuilder获取数据时出现问题
ContactInfo类的数据库中有一个表。现在我想找到customerId=id和isDeleted=falseJava 使用CriteriaBuilder获取数据时出现问题,java,hibernate,hibernate-criteria,Java,Hibernate,Hibernate Criteria,ContactInfo类的数据库中有一个表。现在我想找到customerId=id和isDeleted=false private EntityManager entityManager; public ContactInfo findById(long id) { CriteriaBuilder builder = entityManager.getCriteriaBuilder(); CriteriaQuery<ContactInfo> criteria =
private EntityManager entityManager;
public ContactInfo findById(long id) {
CriteriaBuilder builder = entityManager.getCriteriaBuilder();
CriteriaQuery<ContactInfo> criteria = builder.createQuery( ContactInfo.class );
Root<ContactInfo> root = criteria.from(ContactInfo.class);
criteria.select(root).where(
builder.equal(root.get("customerId"), id),
builder.equal(root.get("isDeleted"), false)
);
return entityManager.createQuery(criteria).getSingleResult();
}
个人信息类:
public class ContactInfo extends BaseInfo {
@Id
@GeneratedValue(strategy = GenerationType.AUTO)
private Long cntId;
@Column(columnDefinition="TEXT",length=4000)
private String data;
@OneToOne(fetch = FetchType.LAZY)
@JoinColumn(name="customer_id")
private PersonalInfo customer;
public ContactInfo(){ }
public ContactInfo(Long id) {
this.cntId = id;
}
}
public class PersonalInfo extends BaseInfo {
@Id
@GeneratedValue(strategy = GenerationType.AUTO)
private Long customerId;//
private Long cardId;//
}
abstract public class BaseInfo {
@CreatedDate
private Date createdDate;
@CreatedBy
private String createdBy;
@LastModifiedDate
private Date modifiedDate;
@LastModifiedBy
private String modifiedBy;
@Column(columnDefinition = "boolean default false", nullable = false)
private boolean isDeleted;
}
BaseInfo类:
public class ContactInfo extends BaseInfo {
@Id
@GeneratedValue(strategy = GenerationType.AUTO)
private Long cntId;
@Column(columnDefinition="TEXT",length=4000)
private String data;
@OneToOne(fetch = FetchType.LAZY)
@JoinColumn(name="customer_id")
private PersonalInfo customer;
public ContactInfo(){ }
public ContactInfo(Long id) {
this.cntId = id;
}
}
public class PersonalInfo extends BaseInfo {
@Id
@GeneratedValue(strategy = GenerationType.AUTO)
private Long customerId;//
private Long cardId;//
}
abstract public class BaseInfo {
@CreatedDate
private Date createdDate;
@CreatedBy
private String createdBy;
@LastModifiedDate
private Date modifiedDate;
@LastModifiedBy
private String modifiedBy;
@Column(columnDefinition = "boolean default false", nullable = false)
private boolean isDeleted;
}
如何绕过以下错误。提前谢谢。
错误
2018-10-07 10:47:11.742 ERROR 1168 --- [nio-8082-exec-2] o.a.c.c.C.[.[.[/].[dispatcherServlet] : Servlet.service() for servlet [dispatcherServlet] in context with path [] threw exception [Request processing failed; nested exception is org.springframework.dao.InvalidDataAccessApiUsageException: Unable to locate Attribute with the the given name [customerId] on this ManagedType [com.exm.base.BaseInfo]; nested exception is java.lang.IllegalArgumentException: Unable to locate Attribute with the the given name [customerId] on this ManagedType [com.csinfotechbd.base.BaseInfo]] with root cause
您的customerId存在于PersonalInfo实体中,因此您的条件查询如下所示
criteria.select(root).where(
builder.equal(root.get("customer").get("customerId"), id)
);
请试试这个
我希望这能解决您的问题。请在问题中添加您的实体类ContactInfo。请向我们显示
ContactInfo
类的代码。我已添加了所有必要的类。。请看一看。customerId不是ContactInfo的一部分,但它是PersonalInfo类的一部分,所以您应该只从PersonalInfo类获取customerId。我正在学习阶段。我对这些东西有点了解。请你告诉我如何摆脱它或任何资源,将帮助我解决这个问题。