Hibernate：无法删除或更新父行：外键约束失败

Question

我在这里使用了多对一的双向关系我无法删除文件一旦进入数据库我是否正在尝试删除我遇到异常已无法删除或更新父行：外键约束失败

/*
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package com.treamis.entity;

import java.io.Serializable;
import java.util.Set;
import javax.persistence.CascadeType;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.FetchType;
import javax.persistence.GeneratedValue;
import javax.persistence.Id;
import javax.persistence.JoinColumn;
import javax.persistence.ManyToOne;
import javax.persistence.OneToMany;
import javax.persistence.OneToOne;
import javax.persistence.Table;
import javax.persistence.Temporal;

/**
 *
 * @author
 * admin
 */
@Entity
@Table(name = "LibraryBookListTable")
public class LibraryBookListEntity implements Serializable {

    @Id
    @GeneratedValue
    @Column(name = "BookListId")
    private int booklistid;
    @Column(name = "ISBN", nullable = false)
    private String isbn;
    @Column(name = "edition", nullable = false)
    private String edition;
    @Column(name = "publisher", nullable = false)
    private String publisher;
    @Column(name = "place", nullable = false)
    private String place;
    @Column(name = "page", nullable = false)
    private String page;
    @Column(name = "source", nullable = false)
    private String source;
    @Column(name = "billno", nullable = false)
    private String billno;
    @Column(name = "callno", nullable = false)
    private String callno;
    @Column(name = "BookTitle", nullable = false)
    private String booktitle;
    @Column(name = "BookAuthor", nullable = false)
    private String author;
    @Column(name = "BookPrice", nullable = false)
    private float price;
    @Column(name = "RackNumber", nullable = false)
    private String rack;
    @Column(name = "PublishedYear", nullable = false)
    private String publishedyear;
    @Column(name = "NoofCopies", nullable = false)
    private int tcopies;
    @Column(name = "DateAdded", nullable = false)
    private java.sql.Date dateAdded;
    @Column(name = "billdate", nullable = false)
    private java.sql.Date billdate;
    @ManyToOne(fetch = FetchType.LAZY, targetEntity = CategoryEntity.class, cascade = CascadeType.ALL)
    @JoinColumn(name = "category_Id", referencedColumnName = "category_Id", nullable = true)
    private CategoryEntity categoryid;
    @OneToOne
    private UserEntity addedBy;
    @OneToOne
    private UserEntity modifiedBy;
    @OneToMany(fetch = FetchType.LAZY, targetEntity = LibraryBarCodeEntity.class, cascade = CascadeType.ALL, mappedBy = "S_no")
    @JoinColumn(name = "BookListId", referencedColumnName = "BookListId")
    private Set< LibraryBarCodeEntity> chield;

    public Set<LibraryBarCodeEntity> getChield() {
        return chield;
    }

    public void setChield(Set<LibraryBarCodeEntity> chield) {
        this.chield = chield;
    }
    //@Column(name = "AddedDate", nullable = false)
    @Temporal(javax.persistence.TemporalType.TIMESTAMP)
    private java.util.Date addedate;
    // @Column(name = "ModifiedDate", nullable = false)
    @Temporal(javax.persistence.TemporalType.TIMESTAMP)
    private java.util.Date modifiedDate;

    public int getBooklistid() {
        return booklistid;
    }

    public void setBooklistid(int booklistid) {
        this.booklistid = booklistid;
    }

    public String getIsbn() {
        return isbn;
    }

    public void setIsbn(String isbn) {
        this.isbn = isbn;
    }

    public String getBooktitle() {
        return booktitle;
    }

    public void setBooktitle(String booktitle) {
        this.booktitle = booktitle;
    }

    public String getAuthor() {
        return author;
    }

    public void setAuthor(String author) {
        this.author = author;
    }

    public float getPrice() {
        return price;
    }

    public void setPrice(float price) {
        this.price = price;
    }

    public String getRack() {
        return rack;
    }

    public void setRack(String rack) {
        this.rack = rack;
    }

    public int getTcopies() {
        return tcopies;
    }

    public void setTcopies(int tcopies) {
        this.tcopies = tcopies;
    }

    public java.sql.Date getDateAdded() {
        return dateAdded;
    }

    public void setDateAdded(java.sql.Date dateAdded) {
        this.dateAdded = dateAdded;
    }

    public CategoryEntity getCategoryid() {
        return categoryid;
    }

    public void setCategoryid(CategoryEntity categoryid) {
        this.categoryid = categoryid;
    }

    public UserEntity getAddedBy() {
        return addedBy;
    }

    public void setAddedBy(UserEntity addedBy) {
        this.addedBy = addedBy;
    }

    public UserEntity getModifiedBy() {
        return modifiedBy;
    }

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

    public java.util.Date getAddedate() {
        return addedate;
    }

    public void setAddedate(java.util.Date addedate) {
        this.addedate = addedate;
    }

    public java.util.Date getModifiedDate() {
        return modifiedDate;
    }

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

//    public String getAccessionnumber() {
//        return accessionnumber;
//    }
//
//    public void setAccessionnumber(String accessionnumber) {
//        this.accessionnumber = accessionnumber;
//    }
    public String getEdition() {
        return edition;
    }

    public void setEdition(String edition) {
        this.edition = edition;
    }

    public String getPublisher() {
        return publisher;
    }

    public void setPublisher(String publisher) {
        this.publisher = publisher;
    }

    public String getPlace() {
        return place;
    }

    public void setPlace(String place) {
        this.place = place;
    }

    public String getPage() {
        return page;
    }

    public void setPage(String page) {
        this.page = page;
    }

    public String getSource() {
        return source;
    }

    public void setSource(String source) {
        this.source = source;
    }

    public String getBillno() {
        return billno;
    }

    public void setBillno(String billno) {
        this.billno = billno;
    }

    public String getCallno() {
        return callno;
    }

    public void setCallno(String callno) {
        this.callno = callno;
    }

    public java.sql.Date getBilldate() {
        return billdate;
    }

    public void setBilldate(java.sql.Date billdate) {
        this.billdate = billdate;
    }

    public String getPublishedyear() {
        return publishedyear;
    }

    public void setPublishedyear(String publishedyear) {
        this.publishedyear = publishedyear;
    }
//    public Set< LibraryBarCodeEntity> getChield() {
//        return chield;
//    }
//
//    public void setChield(Set< LibraryBarCodeEntity> chield) {
//        this.chield = chield;
//    }
}

这是我的另一个实体类..

package com.treamis.entity;

import javax.persistence.CascadeType;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.FetchType;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.JoinColumn;
import javax.persistence.Lob;
import javax.persistence.ManyToOne;
import javax.persistence.Table;

/**
 *
 * @author
 * admin
 */
@Entity
@Table(name = "LibraryBarCodeTable")
public class LibraryBarCodeEntity {

    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    @Column(name = "S_no", nullable = false)
    private int S_no;
    @Column(name = "BookBarCode", nullable = false)
    private String barCode;
    private String accessno;
    @ManyToOne(fetch = FetchType.LAZY, cascade = CascadeType.ALL, targetEntity = LibraryBookListEntity.class)
    @JoinColumn(name = "BookListId", referencedColumnName = "BookListId")
    private LibraryBookListEntity parent;

    public LibraryBookListEntity getParent() {
        return parent;
    }

    public void setParent(LibraryBookListEntity parent) {
        this.parent = parent;
    }

    public int getS_no() {
        return S_no;
    }

    public void setS_no(int S_no) {
        this.S_no = S_no;
    }

    public String getBarCode() {
        return barCode;
    }

    public void setBarCode(String barCode) {
        this.barCode = barCode;
    }

    public String getAccessno() {
        return accessno;
    }

    public void setAccessno(String accessno) {
        this.accessno = accessno;
    }
}

嗨，这是我的完整堆栈跟踪

2014-01-09 15:44:26 ERROR JDBCExceptionReporter:78 - Cannot delete or update a parent row: a foreign key constraint fails (`treamisdemo`.`librarybooklisttable`, CONSTRAINT `FK33BC700C2F4991AA` FOREIGN KEY (`category_Id`) REFERENCES `categoryentity` (`category_Id`))
2014-01-09 15:44:26 ERROR AbstractFlushingEventListener:301 - Could not synchronize database state with session
org.hibernate.exception.ConstraintViolationException: Could not execute JDBC batch update
    at org.hibernate.exception.SQLStateConverter.convert(SQLStateConverter.java:71)
    at org.hibernate.exception.JDBCExceptionHelper.convert(JDBCExceptionHelper.java:43)
    at org.hibernate.jdbc.AbstractBatcher.executeBatch(AbstractBatcher.java:253)
    at org.hibernate.engine.ActionQueue.executeActions(ActionQueue.java:237)
    at org.hibernate.engine.ActionQueue.executeActions(ActionQueue.java:146)
    at org.hibernate.event.def.AbstractFlushingEventListener.performExecutions(AbstractFlushingEventListener.java:298)
    at org.hibernate.event.def.DefaultFlushEventListener.onFlush(DefaultFlushEventListener.java:27)
    at org.hibernate.impl.SessionImpl.flush(SessionImpl.java:1000)
    at org.hibernate.impl.SessionImpl.managedFlush(SessionImpl.java:338)
    at org.hibernate.transaction.JDBCTransaction.commit(JDBCTransaction.java:106)
    at com.treamis.library.BookList.LibraryBookListDelete.execute(LibraryBookListDelete.java:90)
    at org.apache.struts.chain.commands.servlet.ExecuteAction.execute(ExecuteAction.java:58)
    at org.apache.struts.chain.commands.AbstractExecuteAction.execute(AbstractExecuteAction.java:67)
    at org.apache.struts.chain.commands.ActionCommandBase.execute(ActionCommandBase.java:51)
    at org.apache.commons.chain.impl.ChainBase.execute(ChainBase.java:191)

Answer 1

我不知道这会有所帮助，但如果你还没有这样做，你可以编辑你的hibernate.cfg.xml文件，并将hibernate.show_sql从false设置为true，以便查看sql语句是什么异常发生时生成。检查它们可能会为您提供正在发生的事情的线索。您还可以考虑在set *（）函数中放置print语句（System.out.println）以查看主键和外键值是什么，以便您可以检查数据库中的数据（现在您已知道主键值，您可以看到正在处理的记录。）

示例：System.out.println（“在MyDaoClass中：调用customer table：setId（）=”+ customer.getID（））;