Question

我正在尝试在两个类Stock和StockDetails之间使用Hiberate / JPA创建OneToOne关系，所以当我生成数据库时，我没有在StockDetail表中看到应该引用Stock的外键，这是我的代码：< / p>

股票Classe：

@Entity
@Table(name = "stock", catalog = "migration")
public class Stock implements java.io.Serializable {

    private Integer Stock_Id;
    private StockDetail stockDetail;

    @Id
    @GeneratedValue(strategy = IDENTITY)
    @Column(name = "Stock_Id", nullable = false)
    public Integer getStock_Id() {
        return this.Stock_Id;
    }

    @OneToOne(fetch = FetchType.LAZY, mappedBy = "stock", cascade = CascadeType.ALL)
    public StockDetail getStockDetail() {
        return this.stockDetail;
    }

}

StockDetail Classe：

@Entity
@Table(name = "detail_stock", catalog = "migration")
public class StockDetail implements java.io.Serializable {

    private Integer Stock_Id;
    private Stock stock;

    @GenericGenerator(name = "generator", strategy = "foreign", 
    parameters = @Parameter(name = "property", value = "stock"))
    @Id
    @GeneratedValue(generator = "generator")
    @Column(name = "Stock_Id", unique = true, nullable = false)
    public Integer getStock_Id() {
        return this.Stock_Id;
    }

    @OneToOne(fetch = FetchType.LAZY)
    @PrimaryKeyJoinColumn
    public Stock getStock() {
        return this.stock;
    }

}

我找到了一个关于同一问题的话题，但它没有解决我的问题：

Why Foreign key not inserted in hibernate

Answer 1

你必须在StockDetail中做这样的事情

@Entity
@Table(name = "detail_stock", catalog = "migration")
public class StockDetail implements java.io.Serializable {

    private Integer stockDetailId;
    private Stock stock;

    @OneToOne(fetch = FetchType.LAZY)
    public Stock getStock() {
        return this.stock;
    }

    /**
     * @param stock
     *            the stock to set
     */
    public void setStock(Stock stock) {
        this.stock = stock;
    }

    /**
     * @return the stockDetailId
     */
    @Id
    public Integer getStockDetailId() {
        return stockDetailId;
    }

    /**
     * @param stockDetailId the stockDetailId to set
     */
    public void setStockDetailId(Integer stockDetailId) {
        this.stockDetailId = stockDetailId;
    }

}

您的配置问题在于您尝试使用以下配置将stock_id作为stock_detail的主键。

@Id
@GeneratedValue(generator = "generator")
@Column(name = "Stock_Id", unique = true, nullable = false)

相反，你应该做的是将stock_detail_id作为stock_details的主键。由于你在两个实体之间都有一个双向的一对一映射，因此hibernate将自动生成具有上述映射的外键。

使用hibernate annontation生成数据库（未找到外键）

1 个答案: