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[英]JPA annotation for parent composite key to be part of child composite primary key
[英]Hibernate/JPA - one primary key parent to composite key child
我的jpa映射出了什么問題,我試圖將具有一個主鍵的父類映射到具有復合鍵的子類,但是似乎它插入了錯誤的表,已經生成了2個表,但是不幸的是我沒有綁定外部表鍵(policy_value_summary_id)
@Entity
@Table(name = "POLICY_VALUE_SUMMARY")
public class PolicyValueSummary {
@Id
@GeneratedValue(strategy = GenerationType.AUTO)
@Column(name="POLICY_VALUE_SUMMARY_ID")
private Long policyValueSummaryId;
@MapsId("policyValueSummaryId")
@OneToMany
private Set<PolicyValue> policyValues;
}
子類具有復合鍵,其中一個是父ID。
@Entity
@Table(name = "POLICY_VALUE")
public class PolicyValue {
@EmbeddedId
@AttributeOverrides({
@AttributeOverride(name = "policyValueSummaryId", column = @Column(name = "POLICY_VALUE_SUMMARY_ID")),
@AttributeOverride(name = "planAtrId", column = @Column(name = "PLAN_ATR_ID")) })
private PolicyValuePk policyValuePk;
}
這是我的子類組合鍵。
@Embeddable
public class PolicyValuePk implements Serializable {
private Long policyValueSummaryId;
private Long planAtrId;
}
我試圖像這樣將策略摘要值(父級)與策略值(子類)一起保存
PolicyValuePk pk = new PolicyValuePk();
pk.setPlanAtrId(Long.valueOf("1"));
Set<PolicyValue> policyValues = new HashSet<>();
policyValues.add(new PolicyValue(pk));
PolicyValueSummary summary = new PolicyValueSummary();
summary.setPolicyValues(policyValues);
repo.save(summary);
這是輸出給我的錯誤
Hibernate: select hibernate_sequence.nextval from dual
Hibernate: insert into policy_value_summary (policy_value_summary_id) values (?)
Hibernate: insert into policy_value_summary_policy_values (policy_value_summary_policy_value_summary_id, policy_values_plan_atr_id, policy_values_policy_value_summary_id) values (?, ?, ?)
WARN 6880 --- [ main] o.h.engine.jdbc.spi.SqlExceptionHelper : SQL Error: 972, SQLState: 42000
ERROR 6880 --- [ main] o.h.engine.jdbc.spi.SqlExceptionHelper : ORA-00972: identifier is too long
不可以,在Oracle 12.2版之前,標識符的長度不能超過30個字符。 見文件
http://docs.oracle.com/cd/B28359_01/server.111/b28286/sql_elements008.htm#SQLRF00223
但是從版本12.2開始,它們的最大長度為128個字節
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