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[英]Cannot add or update a child row: a foreign key constraint fails Hibernate
[英]Hibernate @OneToOne cannot add or update a child row: a foreign key constraint
我正在使用 JPA、Hibernate、Spring 和 MySQL
無法添加或更新子行:外鍵約束失敗(
db1
,CONSTRAINTstock_detail
FOREIGN KEY(FK_STOCK_ID
)REFERENCESstock
(STOCK_ID
STOCK_ID
)
創建腳本
CREATE TABLE IF NOT EXISTS `stock` (
`STOCK_ID` int(10) unsigned NOT NULL,
`STOCK_CODE` varchar(10) NOT NULL,
`STOCK_NAME` varchar(20) NOT NULL
) ENGINE=InnoDB AUTO_INCREMENT=86 DEFAULT CHARSET=utf8;
CREATE TABLE IF NOT EXISTS `stock_detail` (
`STOCK_ID` int(10) unsigned NOT NULL,
`COMP_NAME` varchar(100) NOT NULL,
`COMP_DESC` varchar(255) NOT NULL
) ENGINE=InnoDB AUTO_INCREMENT=72 DEFAULT CHARSET=utf8;
ALTER TABLE `stock`
ADD PRIMARY KEY (`STOCK_ID`) USING BTREE,
ADD UNIQUE KEY `UNI_STOCK_NAME` (`STOCK_NAME`),
ADD UNIQUE KEY `UNI_STOCK_CODE` (`STOCK_CODE`) USING BTREE;
ALTER TABLE `stock_detail`
ADD PRIMARY KEY (`STOCK_ID`) USING BTREE;
ALTER TABLE `stock`
MODIFY `STOCK_ID` int(10) unsigned NOT NULL AUTO_INCREMENT,AUTO_INCREMENT=86;
ALTER TABLE `stock_detail`
MODIFY `STOCK_ID` int(10) unsigned NOT NULL AUTO_INCREMENT,AUTO_INCREMENT=72;
ALTER TABLE `stock_detail`
ADD CONSTRAINT `FK_STOCK_ID` FOREIGN KEY (`STOCK_ID`) REFERENCES `stock` (`STOCK_ID`);
股票實體
@Entity
@Table(name = "stock")
@XmlRootElement
@Component("astock")
@NamedQueries({
@NamedQuery(name = "Stock.findAll", query = "SELECT s FROM Stock s"),
@NamedQuery(name = "Stock.findByStockId", query = "SELECT s FROM Stock s WHERE s.stockId = :stockId"),
@NamedQuery(name = "Stock.findByStockCode", query = "SELECT s FROM Stock s WHERE s.stockCode = :stockCode"),
@NamedQuery(name = "Stock.findByStockName", query = "SELECT s FROM Stock s WHERE s.stockName = :stockName")})
public class Stock implements Serializable {
private static final long serialVersionUID = 1L;
@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
@Basic(optional = false)
@Column(name = "STOCK_ID")
private Integer stockId;
@Basic(optional = false)
@Size(min = 1, max = 10)
@Column(name = "STOCK_CODE")
private String stockCode;
@Basic(optional = false)
@Size(min = 1, max = 20)
@Column(name = "STOCK_NAME")
private String stockName;
@OneToOne(cascade = CascadeType.ALL, mappedBy = "stock")
private StockDetail stockDetail;
StockDetail實體
@Entity
@Table(name = "stock_detail")
@XmlRootElement
@NamedQueries({
@NamedQuery(name = "StockDetail.findAll", query = "SELECT s FROM StockDetail s"),
@NamedQuery(name = "StockDetail.findByStockId", query = "SELECT s FROM StockDetail s WHERE s.stockId = :stockId"),
@NamedQuery(name = "StockDetail.findByCompName", query = "SELECT s FROM StockDetail s WHERE s.compName = :compName"),
@NamedQuery(name = "StockDetail.findByCompDesc", query = "SELECT s FROM StockDetail s WHERE s.compDesc = :compDesc")})
public class StockDetail implements Serializable {
private static final long serialVersionUID = 1L;
@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
@Basic(optional = false)
@Column(name = "STOCK_ID")
private Integer stockId;
@Basic(optional = false)
@Size(min = 1, max = 100)
@Column(name = "COMP_NAME")
private String compName;
@Basic(optional = false)
@Size(min = 1, max = 255)
@Column(name = "COMP_DESC")
private String compDesc;
@JoinColumn(name = "STOCK_ID", referencedColumnName = "STOCK_ID")
@OneToOne(cascade = CascadeType.ALL)
private Stock stock;
我是如何努力挽救它的。
Stock StockServices = (Stock) applicationContext.getBean("astock");
Stock stock = new Stock();
stock.setStockCode("123");
stock.setStockName("AAPL");
StockDetail stockDetail = new StockDetail();
stockDetail.setCompName("Apple");
stockDetail.setCompDesc("A hardware and software company");
stockDetail.setStock(stock);
stock.setStockDetail(stockDetail);
sessionFactory.getCurrentSession().saveOrUpdate(stock);
同意接受的答案。
不過,如果您想在子表中堅持使用外鍵作為主鍵,請在子表上使用Foreign Key Generator
。 這樣,我們可以減少創建太多唯一ID所需的數據庫引擎開銷。
你的問題是,您嘗試使用stock_detail.STOCK_ID
既作為PRIMARY KEY
的stock_detail
和FOREIGN KEY
從股市和你為他們分配不同的自動遞增值。
當Hibernate保存它們時,它將嘗試保存STOCK_ID =86
stock_detail
和STOCK_ID=72
stock_detail
,這會破壞外鍵合同。
而是在您的stock_detail
表中創建一個單獨的主鍵,例如stock_detail_id
並將stock_id
為單獨的列。
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