使用 CriteriaBuilder 获取数据时出现问题
Problem in fetching data using CriteriaBuilder
ContactInfo class 的数据库中有一个 table。现在我想找到 customerId = id 和 isDeleted = false
的值
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();
}
联系方式class:
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;
}
}
个人信息class:
public class PersonalInfo extends BaseInfo {
@Id
@GeneratedValue(strategy = GenerationType.AUTO)
private Long customerId;//
private Long cardId;//
}
基础信息class:
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;
}
如何绕过下面的错误。提前致谢。
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,因此您的条件查询应如下所示。
criteria.select(root).where(
builder.equal(root.get("customer").get("customerId"), id)
);
请试试这个。
希望这能解决您的问题。
ContactInfo class 的数据库中有一个 table。现在我想找到 customerId = id 和 isDeleted = false
的值 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();
}
联系方式class:
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;
}
}
个人信息class:
public class PersonalInfo extends BaseInfo {
@Id
@GeneratedValue(strategy = GenerationType.AUTO)
private Long customerId;//
private Long cardId;//
}
基础信息class:
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;
}
如何绕过下面的错误。提前致谢。 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,因此您的条件查询应如下所示。
criteria.select(root).where(
builder.equal(root.get("customer").get("customerId"), id)
);
请试试这个。
希望这能解决您的问题。