如何使用Spring和Hibernate模板在同一bean类上创建一对多和多对多关系

Question

我们的第一个实体Bean类。

@Entity
@Table(name = "visamanagmenttable")
@DynamicUpdate 
@SelectBeforeUpdate(true)
public class VisaManagementBean {

    @Id
    @Column(name = "visaManageId")
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private int visaManageId;

    @Column(name = "countryName")
    private String countryName;

    @Column(name = "visaUniqueId")
    private String visaUniqueId;

    @Column(name = "visaCategory")
    private int visaCategory;

    @Column(name = "visaVarientName")
    private String visaVarientName;

    @Column(name = "visaGovernmentFee")
    private String visaGovernmentFee;

    @Column(name = "visaServiceFee")
    private String visaServiceFee;

    @Column(name = "visaSecurityDepositFee")
    private String visaSecurityDepositFee;

    @Column(name = "visaAdditionalFee")
    private String visaAdditionalFee;

    @Column(name = "visaAdditionalRemark")
    private String visaAdditionalRemark;

    @Column(name = "visaSecurityDepositRemark")
    private String visaSecurityDepositRemark;

    @Column(name = "visaMode")
    private String visaMode;

    @Column(name = "visaCitizenShipCountry")
    private String visaCitizenShipCountry;

    @Column(name = "visaLivingCountry")
    private String visaLivingCountry;

    @Column(name = "visaDescription")
    private String visaDescription;

    @Column(name = "visaStatus")
    private String visaStatus;

    @Column(name="createdBy", updatable=false)
    private String createdBy;

    @Column(name="modifiedBy")
    private String modifiedBy;

    @CreationTimestamp
    @Temporal(TemporalType.TIMESTAMP)
    @Column(name="creationDate",updatable=false)
    private Date creationDate;

    @UpdateTimestamp
    @Temporal(TemporalType.TIMESTAMP)
    @Column(name="modifiedDate")
    private Date modifiedDate;

    @Column(name = "status")
    private String status;  

    @Transient
    private String[] citizencountry;

    @Transient
    private String[] livingcountry;

    public int getVisaManageId() {
        return visaManageId;
    }

    public String getVisaUniqueId() {
        return visaUniqueId;
    }

    public int getVisaCategory() {
        return visaCategory;
    }

    public String getVisaVarientName() {
        return visaVarientName;
    }

    public String getVisaGovernmentFee() {
        return visaGovernmentFee;
    }

    public String getVisaServiceFee() {
        return visaServiceFee;
    }

    public String getVisaSecurityDepositFee() {
        return visaSecurityDepositFee;
    }

    public String getVisaAdditionalFee() {
        return visaAdditionalFee;
    }

    public String getVisaAdditionalRemark() {
        return visaAdditionalRemark;
    }

    public String getVisaSecurityDepositRemark() {
        return visaSecurityDepositRemark;
    }

    public String getVisaMode() {
        return visaMode;
    }

    public String getVisaCitizenShipCountry() {
        return visaCitizenShipCountry;
    }

    public String getVisaLivingCountry() {
        return visaLivingCountry;
    }

    public String getVisaDescription() {
        return visaDescription;
    }

    public String getVisaStatus() {
        return visaStatus;
    }

    public String getCreatedBy() {
        return createdBy;
    }

    public String getModifiedBy() {
        return modifiedBy;
    }

    public Date getCreationDate() {
        return creationDate;
    }

    public Date getModifiedDate() {
        return modifiedDate;
    }

    public String getStatus() {
        return status;
    }

    public void setVisaManageId(int visaManageId) {
        this.visaManageId = visaManageId;
    }

    public void setVisaUniqueId(String visaUniqueId) {
        this.visaUniqueId = visaUniqueId;
    }

    public void setVisaCategory(int visaCategory) {
        this.visaCategory = visaCategory;
    }

    public void setVisaVarientName(String visaVarientName) {
        this.visaVarientName = visaVarientName;
    }

    public void setVisaGovernmentFee(String visaGovernmentFee) {
        this.visaGovernmentFee = visaGovernmentFee;
    }

    public void setVisaServiceFee(String visaServiceFee) {
        this.visaServiceFee = visaServiceFee;
    }

    public void setVisaSecurityDepositFee(String visaSecurityDepositFee) {
        this.visaSecurityDepositFee = visaSecurityDepositFee;
    }

    public void setVisaAdditionalFee(String visaAdditionalFee) {
        this.visaAdditionalFee = visaAdditionalFee;
    }

    public void setVisaAdditionalRemark(String visaAdditionalRemark) {
        this.visaAdditionalRemark = visaAdditionalRemark;
    }

    public void setVisaSecurityDepositRemark(String visaSecurityDepositRemark) {
        this.visaSecurityDepositRemark = visaSecurityDepositRemark;
    }

    public void setVisaMode(String visaMode) {
        this.visaMode = visaMode;
    }

    public void setVisaCitizenShipCountry(String visaCitizenShipCountry) {
        this.visaCitizenShipCountry = visaCitizenShipCountry;
    }

    public void setVisaLivingCountry(String visaLivingCountry) {
        this.visaLivingCountry = visaLivingCountry;
    }

    public void setVisaDescription(String visaDescription) {
        this.visaDescription = visaDescription;
    }

    public void setVisaStatus(String visaStatus) {
        this.visaStatus = visaStatus;
    }

    public void setCreatedBy(String createdBy) {
        this.createdBy = createdBy;
    }

    public void setModifiedBy(String modifiedBy) {
        this.modifiedBy = modifiedBy;
    }

    public void setCreationDate(Date creationDate) {
        this.creationDate = creationDate;
    }

    public void setModifiedDate(Date modifiedDate) {
        this.modifiedDate = modifiedDate;
    }

    public void setStatus(String status) {
        this.status = status;
    }

    public String getCountryName() {
        return countryName;
    }

    public void setCountryName(String countryName) {
        this.countryName = countryName;
    }

    public String[] getCitizencountry() {
        return citizencountry;
    }

    public String[] getLivingcountry() {
        return livingcountry;
    }

    public void setCitizencountry(String[] citizencountry) {
        this.citizencountry = citizencountry;
    }

    public void setLivingcountry(String[] livingcountry) {
        this.livingcountry = livingcountry;
    }       

}

CitizenCountryBean与签证管理bean之间存在关系（一对多）

@Entity
@Table(name = "citizencountrytable")
@DynamicUpdate
@SelectBeforeUpdate(true)
public class CitizenCountryBean {

    @Id
    @Column(name = "citizenId")
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private int citizenId;

    @Column(name = "citizencountryName")
    private String citizencountryName;

    @OneToMany(targetEntity = VisaManagementBean.class, cascade = CascadeType.ALL, fetch = FetchType.EAGER)
    @JoinColumn(name = "citizenId", referencedColumnName = "citizenId")
    private Set<VisaManagementBean> visaManagementList = new HashSet<VisaManagementBean>();

    @ManyToMany(cascade = CascadeType.ALL,fetch = FetchType.EAGER)
    private Set<LivingCountryBean> livingCountryBeanList= new HashSet<>();

    @Column(name="createdBy", updatable=false)
    private String createdBy;

    @Column(name="modifiedBy")
    private String modifiedBy;

    @CreationTimestamp
    @Temporal(TemporalType.TIMESTAMP)
    @Column(name="creationDate",updatable=false)
    private Date creationDate;

    @UpdateTimestamp
    @Temporal(TemporalType.TIMESTAMP)
    @Column(name="modifiedDate")
    private Date modifiedDate;

    @Column(name = "status")
    private String status;

    public int getCitizenId() {
        return citizenId;
    }

    public String getCitizencountryName() {
        return citizencountryName;
    }

    public String getCreatedBy() {
        return createdBy;
    }

    public String getModifiedBy() {
        return modifiedBy;
    }

    public Date getCreationDate() {
        return creationDate;
    }

    public Date getModifiedDate() {
        return modifiedDate;
    }

    public String getStatus() {
        return status;
    }

    public void setCitizenId(int citizenId) {
        this.citizenId = citizenId;
    }

    public void setCitizencountryName(String citizencountryName) {
        this.citizencountryName = citizencountryName;
    }

    public void setCreatedBy(String createdBy) {
        this.createdBy = createdBy;
    }

    public void setModifiedBy(String modifiedBy) {
        this.modifiedBy = modifiedBy;
    }

    public void setCreationDate(Date creationDate) {
        this.creationDate = creationDate;
    }

    public void setModifiedDate(Date modifiedDate) {
        this.modifiedDate = modifiedDate;
    }

    public void setStatus(String status) {
        this.status = status;
    }

    public Set<LivingCountryBean> getLivingCountryBeanList() {
        return livingCountryBeanList;
    }

    public Set<VisaManagementBean> getVisaManagementList() {
        return visaManagementList;
    }

    public void setLivingCountryBeanList(Set<LivingCountryBean> livingCountryBeanList) {
        this.livingCountryBeanList = livingCountryBeanList;
    }

    public void setVisaManagementList(Set<VisaManagementBean> visaManagementList) {
        this.visaManagementList = visaManagementList;
    }

}

我们的第三个bean类LivingCountryBean和Cityzenshipship之间的关系是多对多的。 我们所有的数据都已成功插入到各个表中，但是我们的第3个表是通过休眠从多对多关系创建的，我们得到的是空值。

@Entity
@Table(name = "livingcountrytable")
@DynamicUpdate 
@SelectBeforeUpdate(true)
public class LivingCountryBean {

    @Id
    @Column(name = "livingId")
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private int livingId;

    @Column(name = "livingcountryName")
    private String livingcountryName;

    @ManyToMany(mappedBy="livingCountryBeanList")
    private Set<CitizenCountryBean> citizenCountryBeanList= new HashSet<>();

    @Column(name="createdBy", updatable=false)
    private String createdBy;

    @Column(name="modifiedBy")
    private String modifiedBy;

    @CreationTimestamp
    @Temporal(TemporalType.TIMESTAMP)
    @Column(name="creationDate",updatable=false)
    private Date creationDate;

    @UpdateTimestamp
    @Temporal(TemporalType.TIMESTAMP)
    @Column(name="modifiedDate")
    private Date modifiedDate;

    @Column(name = "status")
    private String status;

    public int getLivingId() {
        return livingId;
    }

    public String getLivingcountryName() {
        return livingcountryName;
    }

    public Set<CitizenCountryBean> getCitizenCountryBeanList() {
        return citizenCountryBeanList;
    }

    public void setCitizenCountryBeanList(Set<CitizenCountryBean> citizenCountryBeanList) {
        this.citizenCountryBeanList = citizenCountryBeanList;
    }

    public String getCreatedBy() {
        return createdBy;
    }

    public String getModifiedBy() {
        return modifiedBy;
    }

    public Date getCreationDate() {
        return creationDate;
    }

    public Date getModifiedDate() {
        return modifiedDate;
    }

    public String getStatus() {
        return status;
    }

    public void setLivingId(int livingId) {
        this.livingId = livingId;
    }

    public void setLivingcountryName(String livingcountryName) {
        this.livingcountryName = livingcountryName;
    }

    public void setCreatedBy(String createdBy) {
        this.createdBy = createdBy;
    }

    public void setModifiedBy(String modifiedBy) {
        this.modifiedBy = modifiedBy;
    }

    public void setCreationDate(Date creationDate) {
        this.creationDate = creationDate;
    }

    public void setModifiedDate(Date modifiedDate) {
        this.modifiedDate = modifiedDate;
    }

    public void setStatus(String status) {
        this.status = status;
    }

}

我们在Spring ORM中使用休眠模板类的DAO代码。

 @Override
        public int createVisaManagement(CitizenCountryBean citizenCountryBean) {
            Integer id = (Integer) hibernateTemplate.save(citizenCountryBean);
            return id;
        }

Answer 1

试试吧 ：

CitizenCountryBean。

 @JoinTable(
        name = "CityZen_Living", 
        joinColumns = { @JoinColumn(name = "citizen_id") }, 
        inverseJoinColumns = { @JoinColumn(name = "living_id") }
    )

CitizenCountryBean

 @JoinTable(
        name = "CityZen_Living", 
        joinColumns = { @JoinColumn(name = "living_id") }, 
        inverseJoinColumns = { @JoinColumn(name = "citizen_id") }
    )

注意：不要将int用作主键。 我认为您需要使用：Long或Interger。 在实体中，如果@Column和name字段相同，则不需要@Column。 如果要在休眠时将字段更改名称保存到数据库，则仅@Column。

Answer 2

要记住的一件事。 在尝试使数据库持久之前，请确保“对象”结构是一致的。

我看到您有回溯参考。 在尝试保存之前，您需要确保存在所有向前和向后引用。 如果没有，你会变得很奇怪。

我一直使用的模式是这样的：

在CitizenCountryBean中：

public void add(LivingCountryBean bean) {
   livingCountryBeanList.add(bean);
   bean.add0(this);
}

在LivingCountryBean中：

public void add(CitizenCountryBean bean) {
   bean.add(this);
}

public void add0(CitizenCoutryBean bean) {
   citizenCountryBeanList.add(bean);
}

这样可以确保无论何时从任一侧添加，都将同时设置反向引用和正向引用，并且休眠将正确持久。