JPA中外键的主细节ID

Question

我有三张桌子， 其中一个是（场景），这是主表， 另外两个表（Link，Node）是它的细节。 我希望JPA为我保留外键，同时在没有我干预的情况下在链接和节点表中持久化Scenario， 有没有人帮我这么做？

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情景：

@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

对于要保留主实体（方案）时要保留的所有详细信息对象，请使用CascadeType.ALL。

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

阅读vladmihalcea撰写的本指南：

Reference