如何在實體上添加一系列密鑰？ Openjpa

Question

我有這個實體命名產品。有沒有辦法添加一系列多個鍵？像序列號的關鍵字，序列號和模型的關鍵字，模型的關鍵字等。您如何做到這一點？非常感謝你。

* 
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* and open the template in the editor. 
*/ 
package lotmovement.business.entity; 

import java.io.Serializable; 
import java.sql.Timestamp; 
import javax.persistence.Column; 
import javax.persistence.Entity; 
import javax.persistence.GeneratedValue; 
import javax.persistence.GenerationType; 
import javax.persistence.Id; 
import javax.persistence.Version; 

/** 
* 
* @author god-gavedmework 
*/ 
@Entity 
public class Product implements Serializable { 
    private static final long serialVersionUID = 1L; 
    @Id 
    @GeneratedValue(strategy = GenerationType.AUTO) 
    private Long product_Id; 

    @Column(name = "SERIAL_NUMBER", nullable = false,length = 30) 
    private String serial_Number; 

    @Column(name = "DATE_ASSEMBLED", nullable = false,length = 10) 
    private String date_Assembled; 

    @Column(name = "TIME_ASSEMBLED", nullable = false,length = 20) 
    private String time_Assembled; 

    @Column(name = "MODEL", nullable = false,length = 20) 
    private String model; 

    @Column(name = "BATCH_ID", nullable = false,length = 6) 
    private int batch_Id; 

    @Column(name = "PROCESS_CODE", nullable = false,length = 3) 
    private int process_Code; 

    @Column(name = "DC_POWER_PCB_SERIAL", nullable = false,length = 20) 
    private String dc_Power_PCB_Serial; 

    @Column(name = "CONTROL_PWER_PCB_SERIAL", nullable = false,length = 20) 
    private String control_Power_PCB_Serial; 

    @Column(name = "MAINS_POWER_PCB_SERIAL", nullable = false,length = 20) 
    private String mains_Power_PCB_Serial; 

    @Column(name = "BLOWER_SERIAL", nullable = false,length = 20) 
    private String blower_Serial; 

    @Column(name = "HEATERPLATE_SERIAL", nullable = false,length = 20) 
    private String heaterPlate_Serial; 

    @Column(name = "LAST_PROCESS", nullable = false,length = 3) 
    private String last_Process; 

    @Column(name = "LAST_DATE", nullable = false,length = 20) 
    private String last_Date; 

    @Version 
    @Column(name = "LAST_UPDATED_TIME") 
    private java.sql.Timestamp updatedTime; 

    public Timestamp getUpdatedTime() { 
     return updatedTime; 
    } 

    public void setUpdatedTime(Timestamp updatedTime) { 
     this.updatedTime = updatedTime; 
    } 


    public Long getProduct_Id() { 
     return product_Id; 
    } 

    public void setProduct_Id(Long product_Id) { 
     this.product_Id = product_Id; 
    } 

    public String getSerial_Number() { 
     return serial_Number; 
    } 

    public void setSerial_Number(String serial_Number) { 
     this.serial_Number = serial_Number; 
    } 

    public String getDate_Assembled() { 
     return date_Assembled; 
    } 

    public void setDate_Assembled(String date_Assembled) { 
     this.date_Assembled = date_Assembled; 
    } 

    public String getTime_Assembled() { 
     return time_Assembled; 
    } 

    public void setTime_Assembled(String time_Assembled) { 
     this.time_Assembled = time_Assembled; 
    } 

    public String getModel() { 
     return model; 
    } 

    public void setModel(String model) { 
     this.model = model; 
    } 

    public int getBatch_Id() { 
     return batch_Id; 
    } 

    public void setBatch_Id(int batch_Id) { 
     this.batch_Id = batch_Id; 
    } 

    public int getProcess_Code() { 
     return process_Code; 
    } 

    public void setProcess_Code(int process_Code) { 
     this.process_Code = process_Code; 
    } 

    public String getDc_Power_PCB_Serial() { 
     return dc_Power_PCB_Serial; 
    } 

    public void setDc_Power_PCB_Serial(String dc_Power_PCB_Serial) { 
     this.dc_Power_PCB_Serial = dc_Power_PCB_Serial; 
    } 

    public String getControl_Power_PCB_Serial() { 
     return control_Power_PCB_Serial; 
    } 

    public void setControl_Power_PCB_Serial(String control_Power_PCB_Serial) { 
     this.control_Power_PCB_Serial = control_Power_PCB_Serial; 
    } 

    public String getMains_Power_PCB_Serial() { 
     return mains_Power_PCB_Serial; 
    } 

    public void setMains_Power_PCB_Serial(String mains_Power_PCB_Serial) { 
     this.mains_Power_PCB_Serial = mains_Power_PCB_Serial; 
    } 

    public String getBlower_Serial() { 
     return blower_Serial; 
    } 

    public void setBlower_Serial(String blower_Serial) { 
     this.blower_Serial = blower_Serial; 
    } 

    public String getHeaterPlate_Serial() { 
     return heaterPlate_Serial; 
    } 

    public void setHeaterPlate_Serial(String heaterPlate_Serial) { 
     this.heaterPlate_Serial = heaterPlate_Serial; 
    } 

    public String getLast_Process() { 
     return last_Process; 
    } 

    public void setLast_Process(String last_Process) { 
     this.last_Process = last_Process; 
    } 

    public String getLast_Date() { 
     return last_Date; 
    } 

    public void setLast_Date(String last_Date) { 
     this.last_Date = last_Date; 
    } 


} 

Answer 1

我相信你要找的東西根本不正確。密鑰應該是實體實例的唯一標識符。在你的例子中，你想要一個「模型」的關鍵，它聽起來不正確。

如果您對「鑰匙」有其他要求，請澄清，我們可能會進一步討論。