在休眠状态下同时保存父对象和子对象列表

Question

This is my entity classes

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

            @Id
            @Column(name="hdr_sr_no")
            @GeneratedValue(strategy=GenerationType.IDENTITY)
            private Integer HdrSrNo;

            @Column(name="comp_cd")
            private Integer compCd;

            //bi-directional many-to-one association to EppsMmMtrlReqDtl
            @OneToMany(mappedBy="hdrInfo")
            @Cascade(CascadeType.SAVE_UPDATE)
            private List<DetailInfo> detailInfo;
            //getters and setters
        }

Detail Info Entity class

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

            @Id
            @GeneratedValue(strategy=GenerationType.IDENTITY)
            @Column(name="dtl_sr_no")
            private Integer dtlSrNo;

            @Column(name="active_yn")
            private String activeYn;

            @Column(name="short_close_qty")
            private BigDecimal shortCloseQty;

            @Column(name="short_close_rsn")
            private String shortCloseRsn;

            @Column(name="short_close_yn")
            private String shortCloseYn;

            @Column(name="sugg_brand")
            private String suggBrand;

            @Column(name="terminal_id")
            private String terminalId;

            @Column(name="transaction_stage")
            private Integer transactionStage;

            //bi-directional many-to-one association to EppsMmMtrlReqHdr
            @ManyToOne
            @JoinColumn(name="hdr_sr_no", nullable = false)
            private HdrInfo hdrInfo;

               //getters and setters
        }

Main

public static void main(String[] args) {
    Session session = HibernateUtil.getSessionFactory().openSession();

    HdrInfo hdr =new HdrInfo();
    hdr.setCompCd(1);
    List<DetailInfo> lst=new ArrayList<DetailInfo>();
    for (int j = 0; j < 3; j++) {                       
        DetailInfo dtl=new DetailInfo();

        dtl.setTransactionStage(Integer.parseInt("1"));
        dtl.setTerminalId("linuxPc01");
        dtl.setActiveYn("Y");

        dtl.setShortCloseYn("Y");

        dtl.setHdrInfo(hdr);
        lst.add(dtl);
    }
    hdr.setEppsMmMtrlReqDtls(lst);
    session.saveOrUpdate(hdr);
    session.getTransaction().commit();
}

now if i run main class to save HderInfo class with list of DtlInfoClass gives me error of same object Identifier was found while saving List of DtlInfo,Now primary key of DtlInfo is also auto incremented then what is proper solution ??? help me !!!

Answer 1

Try it like this:

HdrInfo

private List<DetailInfo> detailInfos = new ArrayList<DetailInfo>();

public void addDetailInfo(DetailInfo detailInfo) {
    detailInfo.setParent(this);
    detailInfos.add(detailInfo);
}

public void removeDetailInfo(DetailInfo detailInfo) {
    detailInfos.remove(detailInfo);
    if (detailInfo != null) {
        detailInfo.setParent(null);
    }
}

Main

Session session = HibernateUtil.getSessionFactory().openSession();
Transaction tx = null;
try {
    tx = session.beginTransaction();

    HdrInfo hdr = new HdrInfo();
    hdr.setCompCd(1);
    for (int j = 0; j < 3; j++) {                       
        DetailInfo dtl=new DetailInfo();

        dtl.setTransactionStage(Integer.parseInt("1"));
        dtl.setTerminalId("linuxPc01");
        dtl.setActiveYn("Y");

        dtl.setShortCloseYn("Y");

        hdr.addDetailInfo(dtl);
    }
    session.saveOrUpdate(hdr);

    tx.commit();
}
catch (RuntimeException e) {
    if (tx != null) tx.rollback();
    throw e;
}
finally {
    sess.close();
}

1. You need to explicitly start/commit/rollback a transaction.
2. Always close the session to release allocated resources (db connections)
3. It's better to initialize all children collections from start
4. Prefer adding add/remove utilities when having bi-directional associations

Answer 2

Here are some suggestions and try like that;

1. I am sure that you are trying to persist as new object instances to DB

    //session.saveOrUpdate(hdr); session.save(hdr); 

2. Override equals() and hashCode() in entity classes

3. as @pL4Gu33 said, care spelling of mappedBy

4. Open transaction before nay db update operation

    session.getTransaction().begin();