从一个 table 获取数据并插入另一个 table JPA

Question

我是 JPA 的初学者。根据要求，我试图从多个 tables(emp_boarding_details,amex_emp_detail,emp_offboarding_details) 中获取数据并插入到另一个 table 即 emp_boarding_history.

1. EmpBoardingHistoryRepository.java:

public interface EmpBoardingHistoryRepository extends JpaRepository<EmpBoardingHistory, Long> {

@Query(nativeQuery = true, value = "SELECT new com.boarding.boardinghistory.resource.EmpBoardingHistory**(ebd.exemption_type_txt, ebd.exemption_remarks_txt, ebd.emp_no_int, ebd.first_name_txt, ebd.middle_name_txt, ebd.last_name_txt, ebd.email_id_txt, ebd.emp_or_contractor_ind, ebd.vendor_laptop_desktop_asset_txt, ebd.country_origin_txt, ebd.status_txt, aed.billing_po_no_txt, aed.contractor_id_txt, aed.contract_type_txt, aed.proj_master_cd_txt, aed.amex_email_id_txt, aed.amex_laptop_desktop_asset_id_txt, aed.ads_id_txt, aed.cost_center_txt, aed.contractor_id_creation_date, aed.first_billing_date, aed.clarity_resource_role_txt, aed.platform_id_txt, aed.premium_technology_txt, aed.resource_status_txt, aed.onboard_completion_date, eod.resource_leaving_date, eod.departure_date) FROM emp_boarding_details ebd, amex_emp_details aed, emp_offboarding_details eod WHERE ebd.emp_no_int = aed.emp_no_int AND aed.emp_no_int = eod.emp_no_int AND ebd.emp_no_int = :empNo")
    List<EmpBoardingHistory> getEmpBoardingDetails(@Param("empNo") long empNo); 
}

2。 EmpBoardingHistory.java:

@Entity
@Table(name = "emp_boarding_history")
public class EmpBoardingHistory implements Serializable {
    private static final long serialVersionUID = 1L;

    public EmpBoardingHistory() {
        super();
    }

    public EmpBoardingHistory(String exemptionfromaxpreporting, String exemptionremarks,
            @NotNull(message = "Employee number is mandatory") @Range(min = 999, max = 999999999) int empno,
            String firstname, String middlename, String lastname, String emailid, String emporcontractor,
            String venderlaptopordesktopassetno, String countryoforigin, String status, String billponumber,
            String contractoridnumber, String contracttype, String projmastercd, String amexemailaddress,
            String amexlaptopordesktopassetnumber, String adsid, String costcenter, Date contractoridcreationdate,
            Date firstbillingdate, String clarityorresourcerole, String premiumtechnology, String resourcestatus,
            Date onboardCompletionDate, Date resourceleavingdate,
            @NotNull(message = "First Billing Date is mandatory") Date departuredate) {
        super();
        this.exemptionfromaxpreporting = exemptionfromaxpreporting;
        this.exemptionremarks = exemptionremarks;
.......

//For all setter and getter defined
}}

当我尝试调用此 getEmpBoardingDetails() 时，出现以下异常：

020-06-03 16:24:15.146 DEBUG 68096 --- [nio-8080-exec-5] org.hibernate.SQL                        : SELECT new com.boarding.boardinghistory.resource.EmpBoardingHistory(ebd.exemption_type_txt, ebd.exemption_remarks_txt, ebd.emp_no_int, ebd.first_name_txt, ebd.middle_name_txt, ebd.last_name_txt, ebd.email_id_txt, ebd.emp_or_contractor_ind, ebd.vendor_laptop_desktop_asset_txt, ebd.country_origin_txt, ebd.status_txt, aed.billing_po_no_txt, aed.contractor_id_txt, aed.contract_type_txt, aed.proj_master_cd_txt, aed.amex_email_id_txt, aed.amex_laptop_desktop_asset_id_txt, aed.ads_id_txt, aed.cost_center_txt, aed.contractor_id_creation_date, aed.first_billing_date, aed.clarity_resource_role_txt, aed.platform_id_txt, aed.premium_technology_txt, aed.resource_status_txt, aed.onboard_completion_date, eod.resource_leaving_date, eod.departure_date) FROM emp_boarding_details ebd, amex_emp_details aed, emp_offboarding_details eod WHERE ebd.emp_no_int = aed.emp_no_int AND aed.emp_no_int = eod.emp_no_int AND ebd.emp_no_int = ?
2020-06-03 16:24:15.149 TRACE 68096 --- [nio-8080-exec-5] o.h.type.descriptor.sql.BasicBinder      : binding parameter [1] as [BIGINT] - [909089]
2020-06-03 16:24:15.282  WARN 68096 --- [nio-8080-exec-5] o.h.engine.jdbc.spi.SqlExceptionHelper   : SQL Error: 1064, SQLState: 42000
2020-06-03 16:24:15.282 ERROR 68096 --- [nio-8080-exec-5] o.h.engine.jdbc.spi.SqlExceptionHelper   : You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near '.boarding.boardinghistory.resource.EmpBoardingHistory(ebd.exemption_type_txt, eb' at line 1

继续上述问题-> 现在我能够成功地从多个 table 中检索数据（感谢 Jens！）但是当我试图将该响应保存到另一个 table 中时，即emp_boarding_history，数据未持久化。

//检索和保存逻辑

public EmpBoardingHistory selectSaveEmpBoardingHistory(Integer empNo) { 
    //Retrieve Data FROM ONE TABLE 
    List<EmpBoardingHistory> empBoardingHistoryList = empBoardingHistoryRepository.findBoardingHistoryEmpNo(empNo); 
    EmpBoardingHistory empBoardingHistory = new EmpBoardingHistory(); 
    for (EmpBoardingHistory empBoardingHistoryObj : empBoardingHistoryList) 
    { 
    //SAVING DATA INTO ANOTHER TABLE 
    empBoardingHistoryRepository.save(empBoardingHistoryObj);
    empBoardingHistory = empBoardingHistoryObj; 
    } 
    return empBoardingHistory; 
    }

Answer 1

您正在查询中使用构造函数表达式：

new com.boarding.boardinghistory.resource.EmpBoardingHistory**(...

这是来自 JPQL 的构造。但是您还将其标记为 nativeQuery = true ，这意味着它被解释为 SQL 而 SQL 没有这样的构造。使用构造函数表达式或将其标记为本机查询，不能同时使用。

此外，构造函数表达式包含 **，这将不起作用。

从一个 table 获取数据并插入另一个 table JPA

Fetch data from one table and Insert into another table JPA

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