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休眠從子表中選擇查詢

休眠從子表中選擇查詢

慕無(wú)忌1623718 2021-04-02 09:40:45
我很冬眠。我有兩個(gè)表具有一對(duì)多的關(guān)系。兩張表是:public class Pashmina implements Serializable {    @Id    @GeneratedValue(strategy = GenerationType.AUTO, generator = "sq_pashmina_id")    @SequenceGenerator(name = "sq_pashmina_id", sequenceName = "sq_pashmina_id")    @Column(name = "PASHMINA_ID")    private int pashminaId;    @Column(name = "PASHMINA_NAME")    private String pashminaName;    @Column(name = "PRICE")    private double price;    @Column(name = "ADDED_AT", insertable = false)    @Temporal(TemporalType.TIMESTAMP)    private Date addedAt;    @Column(name = "CATEGORY")    private String category;    @Column(name = "ENABLED", insertable = false)    private Character enabled;    @OneToMany(mappedBy = "colourId", fetch = FetchType.EAGER)    private Set<PashminaColour> pashminaColor  = new HashSet<PashminaColour>();    @OneToMany(mappedBy = "imageId", fetch = FetchType.EAGER)    private Set<Image> images  = new HashSet<Image>();    @OneToMany(mappedBy = "descriptionId", fetch = FetchType.EAGER)    private Set<Description> descriptions  = new HashSet<Description>();    //getter and setter method這是一個(gè)父類,它與Image表具有一對(duì)多關(guān)系public class Image implements Serializable {    @Id    @Column(name = "IMAGE_ID")    private int imageId;    @Column(name = "IMAGE_NAME")    private String imageName;    @JoinColumn(name = "PASHMINA_ID", referencedColumnName = "PASHMINA_ID")    @ManyToOne    private Pashmina pashmina;現(xiàn)在,我要使用其父類的ID(即pashminaId)imagenames從Image類中選擇一個(gè)例如:從TBL_IMAGE中選擇IMAGE_NAME,其中PASHMINA_ID ='some_digit';我如何在圖像類中傳遞pashminaId,因?yàn)闆](méi)有pashminaId它只有Parent類的Object創(chuàng)建Pashmina。那么,我該如何在休眠狀態(tài)下實(shí)現(xiàn)呢?
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當(dāng)Hibernate對(duì)待對(duì)象而不是SQL表時(shí),您可以簡(jiǎn)單地pashmina從您的image對(duì)象訪問(wèn)該對(duì)象,并且在查詢中您將對(duì)待Java對(duì)象/ POJO,因此可以通過(guò)對(duì)其進(jìn)行訪問(wèn)Image.pashmina.pashminaId。


因此,您可以編寫以下查詢:


String hql = "select I.imageName FROM Image I WHERE I.pashmina.pashminaId = 10";

Query query = session.createQuery(hql);

List results = query.list(); 


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反對(duì) 回復(fù) 2021-04-28
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