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我的数据库架构有两个表：-Rule Table和Rule Scope表。
规则表列（rule_id主键，.....）和规则范围列（rule_id外键，Scope_id（不是自动生成的 Id，可以为不同的 rule_id 重复）
规则范围主键是rule_id和的组合Scope_id。

我的RULE实体 

@Entity
@Table(name = "RULE")
public class Rule implements IEntity {

@Column(name = "RULE_ID")
@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
private int ruleId;

@OneToMany(fetch=FetchType.LAZY,mappedBy="rule")
private Set<RuleScope> ruleScope=new HashSet<RuleScope>();

Rule Scope实体：-

@Entity
@Table(name = "RULE_SCOPE")
public class RuleScope {

@Embeddable
public static class Id implements Serializable{
    @Column(name = "RULE_ID")
    private int ruleId;
    @Column(name = "SCOPE_ID")
    private int scopeId;
}

@EmbeddedId
private Id id = new Id();

@ManyToOne(cascade = CascadeType.ALL, fetch = FetchType.LAZY)
@JoinColumn(name = "RULE_ID", insertable = false, updatable = false)
private Rule rule;

我有以下问题：-
当我尝试保存 Rule 时，但它没有保留子实体。当坚持违反外键约束的规则范围时，它为规则 ID 提供 0。但是当我使用@JoinColumn 时，它正在工作。请帮助我在坚持和使用的Rule Scope同时坚持下去。RulemappedBy

4

1 回答 1

1

尝试这个：

规则实体：

@Entity
@Table(name = "RULE")
public class Rule implements Serializable {

    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    @Column(name = "RULE_ID", unique = true, nullable = false)
    private int ruleId;

    @OneToMany(mappedBy = "id.rule", cascade = CascadeType.ALL)
    private Set<RuleScope> ruleScope = new HashSet<RuleScope>(0);

    // Generate Getters, Setters, hashCode() and equals()
}

RULE_SCOPE 实体：

@Entity
@Table(name = "RULE_SCOPE")
public class RuleScope implements Serializable {

    @EmbeddedId
    private Id id;

    // Generate Getters, Setters
}

RULE_SCOPE 复合PK：

@Embeddable
public class Id implements Serializable {

    @ManyToOne
    @JoinColumn(name = "RULE_ID", , nullable = false)
    private Rule rule;

    @Column(name = "SCOPE_ID")
    private int scopeId;

    // Generate Getters, Setters, hashCode() and equals()
}
于 2014-12-07T06:50:12.153 回答