时间戳

首页 > 解决方案 > 为什么得到 org.hibernate.hql.internal.ast.QuerySyntaxException: Path expected for join！加入 3 个表时

spring-boot - 为什么得到 org.hibernate.hql.internal.ast.QuerySyntaxException: Path expected for join！加入 3 个表时

问题描述

我有三个实体基本信息，性别和部门。如果我加入 basicInfo 和性别模型，那么它工作正常，但是当想要同时加入部门和其他两个实体时，然后显示

.QuerySyntaxException：连接的预期路径！

我这里的三个实体类，

@Entity
@Table(name = "employeebasicinfo")
public class BasicInfoModel {
@Id private String employeeId;
@NotBlank private String firstName;
@NotBlank private String lastName;
@NotNull private Integer companyId;
@Transient private String companyName;
private String phoneNo;

@Column(name = "sex")
private char sexId;

@Transient private String sexName;

@Temporal(TemporalType.TIMESTAMP)
private Date birthDate;

@Temporal(TemporalType.TIMESTAMP)
private Date joiningDate;

@NotNull private Integer department;
@Transient private String departmentName;

@ManyToOne()
@JoinColumn(name = "sex", referencedColumnName = "id", insertable = false, updatable = false)
private GenderModel genderModel;

@ManyToOne
@JoinColumn(
  name = "department",
  referencedColumnName = "id",
  insertable = false,
  updatable = false)
private DepartmentModel departmentModel;
// getter setter
 }

性别模型

 @Entity
 @Table(name = "gender")
 public class GenderModel implements Serializable {
 @Id
 @Column(name = "id")
 private char id;

 @Column(name = "name")
 private String name;
 //getter setter
}

和部门模型

   @Entity
   @Table(name = "department")
   public class DepartmentModel {
   @Id private int id;
   private String name;
   //getter setter
}

我的 Dto 课 

public class BasicInfoDto {
  private String employeeId;
  private String firstName;
  private String lastName;
  private Integer companyId;
  private String companyName;
  private String phoneNo;
  private char sexId;
  private String sexName;
  private Date birthDate;
  private Date joiningDate;
  private Integer department;
  private String departmentName;


  public BasicInfoDto(char sexId, String sexName, int department, String departmentName) {
    this.sexId = sexId;
    this.sexName = sexName;
    this.department = department;
    this.departmentName = departmentName;

   //getter setter
  }

我的存储库类如下：

@Repository
public interface BasicInfoRepository extends JpaRepository<BasicInfoModel, String> {


  @Query(
      value =
          "SELECT  new com.employeeAttendance.employeeAttendance.dto.BasicInfoDto ("
              + " a.sexId, b.name, a.department,c.name) FROM "
              + " BasicInfoModel a INNER JOIN GenderModel b on a.sexId = b.id" +
                   " INNER JOIN DepartmentMode c on a.department = c.id")
  List<BasicInfoDto> getBasicInfoList();
}

最后我得到了这个错误

原因：java.lang.IllegalArgumentException: org.hibernate.hql.internal.ast.QuerySyntaxException: 路径期望加入！[SELECT new com.employeeAttendance.employeeAttendance.dto.BasicInfoDto (a.sexId, b.name, a.department,c.name) FROM com.employeeAttendance.employeeAttendance.model.BasicInfoModel 一个 INNER JOIN com.employeeAttendance.employeeAttendance.model。 a.sexId 上的 GenderModel b = b.id INNER JOIN DepartmentMode c on a.department = c.id] at org.hibernate.internal.ExceptionConverterImpl.convert(ExceptionConverterImpl.java:138) ~[hibernate-core-5.3.7. Final.jar:5.3.7.Final] 在 org.hibernate.internal.ExceptionConverterImpl.convert(ExceptionConverterImpl.java:181) ~[hibernate-core-5.3.7.Final.jar:5.3.7.Final] 在 org. hibernate.internal.ExceptionConverterImpl.convert(ExceptionConverterImpl.java: 调用(ExtendedEntityManagerCreator.java:350) ~[spring-orm-5.1.4.RELEASE.jar:5.1.4.RELEASE] at com.sun.proxy.$Proxy109.createQuery(Unknown Source) ~[na:na] at org.springframework.data.jpa.repository.query.SimpleJpaQuery.validateQuery(SimpleJpaQuery.java:87) ~[spring-data-jpa-2.1.4.RELEASE.jar:2.1.4.RELEASE] ... 76个常用框架省略引起：org.hibernate.hql.internal.ast.QuerySyntaxException：加入路径预期！[SELECT new com.employeeAttendance.employeeAttendance.dto.BasicInfoDto (a.sexId, b.name, a.department,c.name) FROM com.employeeAttendance.employeeAttendance.model.BasicInfoModel 一个 INNER JOIN com.employeeAttendance.employeeAttendance.model。 a.sexId 上的 GenderModel b = b.id INNER JOIN DepartmentMode c on a.department = c.id] at org.hibernate.hql.internal.ast.QuerySyntaxException。

但是，如果我删除与部门的第二次加入，那么它工作正常。

标签： spring-bootspring-data-jpaspring-data

解决方案

您正在处理 jpql 中的实体属性而不是表。所以你只告诉 jpql 使用哪个属性来加入：

"SELECT  new com.employeeAttendance.employeeAttendance.dto.BasicInfoDto ("
  + " a.sexId, b.name, a.department,c.name) FROM "
  + " BasicInfoModel a INNER JOIN a.genderModel b "
  + " INNER JOIN a.departmentModel c";

推荐阅读