hibernate使用annotation进行持久化操作(二)

 5. 级联持久化操作

 

主表DO

 

package com.alibaba.corp.metrix.admin.biz.edi.model.domain.taobao;

import java.io.Serializable;
import java.util.Date;
import java.util.List;

import javax.persistence.CascadeType;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.Id;
import javax.persistence.OneToMany;
import javax.persistence.Table;
import javax.persistence.Transient;

import org.hibernate.annotations.GenericGenerator;


@Entity(name = "IfreeOrder")
@Table(name = "metrix_ifree_order")
public class IfreeOrder implements Serializable {
    @Transient
    private static final long              serialVersionUID = -3466339962287852603L;

    @Id
    @GenericGenerator(name = "generator", strategy = "assigned")
    @GeneratedValue(generator = "generator")
    @Column(name = "id", unique = true, nullable = false)
    private String                         Id;                                      // 发布id

    @Column(name = "subject")
    private String                         Subject;                                 // 发布标题

    @Column(name = "one_product_line")
    private String                         OneProductLine;                          // 一级产品线

    @Column(name = "two_product_line")
    private String                         TwoProductLine;                          // 二级产品线

    @Column(name = "team")
    private String                         Team;                                    // 团队

    @Column(name = "applies")
    private String                         Applys;                                  // 应用，如果有多个，中间用英文逗号隔开

    @Column(name = "pm")
    private String                         PM;                                      // PM

    @Column(name = "pe")
    private String                         PE;                                      // PE

    @Column(name = "qa")
    private String                         QA;                                      // QA


    @OneToMany(mappedBy = "ifreeOrder", cascade = CascadeType.ALL)
    private List<IfreeOrderRelatedProject> ReleateProject;                          // 相关项目

    @Column(name = "gmt_created")
    private Date                           gmtCreated       = new Date();           // 本地数据库创建时间

    public String getId() {
        return Id;
    }

    public void setId(String Id) {
        this.Id = Id;
    }

    public String getSubject() {
        return Subject;
    }

    public void setSubject(String Subject) {
        this.Subject = Subject;
    }

    public String getOneProductLine() {
        return OneProductLine;
    }

    public void setOneProductLine(String OneProductLine) {
        this.OneProductLine = OneProductLine;
    }

    public String getTwoProductLine() {
        return TwoProductLine;
    }

    public void setTwoProductLine(String TwoProductLine) {
        this.TwoProductLine = TwoProductLine;
    }

    public String getTeam() {
        return Team;
    }

    public void setTeam(String Team) {
        this.Team = Team;
    }

    public String getApplys() {
        return Applys;
    }

    public void setApplys(String Applys) {
        this.Applys = Applys;
    }

    public String getPM() {
        return PM;
    }

    public void setPM(String PM) {
        this.PM = PM;
    }

    public String getPE() {
        return PE;
    }

    public void setPE(String PE) {
        this.PE = PE;
    }

    public String getQA() {
        return QA;
    }

    public void setQA(String QA) {
        this.QA = QA;
    }

    public List<IfreeOrderRelatedProject> getReleateProject() {
        return ReleateProject;
    }

    public void setReleateProject(List<IfreeOrderRelatedProject> ReleateProject) {
        this.ReleateProject = ReleateProject;
        if (this.ReleateProject != null) {
            for (IfreeOrderRelatedProject ifreeOrderRelatedProject : this.ReleateProject) {
                ifreeOrderRelatedProject.setIfreeOrder(this);
            }
        }
    }

    public Date getGmtCreated() {
        return gmtCreated;
    }

    public void setGmtCreated(Date gmtCreated) {
        this.gmtCreated = gmtCreated;
    }
}

从表对应的DO

 

 

package com.alibaba.corp.metrix.admin.biz.edi.model.domain.taobao;

import java.io.Serializable;
import java.util.Date;

import javax.persistence.*;

import org.hibernate.annotations.GenericGenerator;


@Entity
@Table(name = "ifree_order_related_project")
public class IfreeOrderRelatedProject implements Serializable {
    @Transient
    private static final long serialVersionUID = -4783733149722014928L;

    @Id
    @GenericGenerator(name = "generator", strategy = "increment")
    @GeneratedValue(generator = "generator")
    @Column(name = "inner_id", unique = true, nullable = false)
    private Integer index;

    @Column(name = "id")
    private String Id;

    @Column(name = "project_id")
    private String projectId; // 项目Id

    @Column(name = "publish_id")
    private String PublishId; // 发布Id

    @Column(name = "is_last")
    private String IsLast; // 是否是最后一次发布

    @Column(name = "publish_num")
    private String PublishNum; // 发布次数

    @ManyToOne
    @JoinColumn(name = "order_id") //从表的外键，会默认关联主表的主键，不需要字段名相同
    private IfreeOrder ifreeOrder;

    @Column(name = "gmt_created")
    private Date gmtCreated = new Date(); // 本地数据库创建时间

    public Integer getIndex() {
        return index;
    }

    public void setIndex(Integer index) {
        this.index = index;
    }

    public String getId() {
        return Id;
    }

    public void setId(String Id) {
        this.Id = Id;
    }

    public String getProjectId() {
        return projectId;
    }

    public void setProjectId(String projectId) {
        this.projectId = projectId;
    }

    public String getPublishId() {
        return PublishId;
    }

    public void setPublishId(String PublishId) {
        this.PublishId = PublishId;
    }

    public String isIsLast() {
        return IsLast;
    }

    public void setIsLast(String IsLast) {
        this.IsLast = IsLast;
    }

    public String getPublishNum() {
        return PublishNum;
    }

    public void setPublishNum(String PublishNum) {
        this.PublishNum = PublishNum;
    }

    public IfreeOrder getIfreeOrder() {
        return ifreeOrder;
    }

    public void setIfreeOrder(IfreeOrder ifreeOrder) {
        this.ifreeOrder = ifreeOrder;
    }

    public Date getGmtCreated() {
        return gmtCreated;
    }

    public void setGmtCreated(Date gmtCreated) {
        this.gmtCreated = gmtCreated;
    }
}

说明：

     1. 上面DO的field名称不规范，是因为接入我们系统序列化后的Json字符串不规范，为了能兼容其它的系统，使用了这种非常恶心的写法。

     2. 上面的DO中我们只使用到了单向关联，主表的CRUD会级联到从表

     3. 注意主表、从表中@OneToMany及@ManyToOne标签的写法

     4. 进行级联保存时，调用主表对应Dao进行save或者saveOrUpdate操作时，可能会抛出update操作，但数据库中row size = 0的异常，这是因为hibernate根据你是否设置了主键ID来判断你进行的是新增或者更新操作，如果你需要持久化的对象主键已经有值了，此时会默认进行update操作，但数据库中此主键还未对应任何数据，因此会抛出异常