JPA中外键的主从ID

Question

我有三张桌子， 其中之一是（场景），它是主表， 另外两个表（链接，节点）是它的详细信息。 我希望 JPA 为我保留外键，同时在链接和节点表中保留场景而无需我的干预， 有没有人帮我做这个？？？

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场景：

@Entity
@NamedQueries({ @NamedQuery(name = "Scenario.findAll", query = "select o from Scenario o") })
public class Scenario implements Serializable {
private String className;
@Id
@Column(nullable = false,name="ID")
private int id;
private String linkFromPortIdProperty;
private String linkToPortIdProperty;
private String UUID;
@OneToMany(mappedBy = "scenario", cascade = { CascadeType.PERSIST, CascadeType.MERGE })
private List<Link> linkDataArray;
@OneToMany(mappedBy = "scenario1", cascade = { CascadeType.PERSIST, CascadeType.MERGE })
private List<Node> nodeDataArray;

链接：

@Entity
@NamedQueries({ @NamedQuery(name = "Lnk.findAll", query = "select o from Link o") })
@Table(name = "LNK", schema = "DEV_SGMNT")

public class Link implements Serializable {
private static final long serialVersionUID = -5262332521707870082L;


@Transient
private String to;
private int fromPort;
@Id
@Column(nullable = false)
private int id;
private double[] points;
@Transient
private String from;
private int toPort;
@ManyToOne
@JoinColumn(name = "SCENARIO_ID")
private Scenario scenario;

节点：

@Entity
@NamedQueries({ @NamedQuery(name = "Node.findAll", query = "select o from Node o") })
public class Node implements Serializable {
private static final long serialVersionUID = -8401815303355236645L;
private String classname;
@Id
@Column(nullable = false)
private int id;
private BigDecimal inbound;
private String key;
private BigDecimal outbound;
private String properties;
private String tab;
private String text;
private String vizitems;
@ManyToOne
@JoinColumn(name = "SCENARIO_ID")
private Scenario scenario1;

Answer 1

在持久化主实体（场景）时，对所有要持久化的细节对象使用 CascadeType.ALL。

@OneToMany(mappedBy = "scenario",cascade = CascadeType.ALL, orphanRemoval = true) 
private List<Link> linkDataArray;

阅读 vladmihalcea 撰写的本指南：

Reference