Question

我有以下表格。

ACCOUNTS（父表），其列为ACC_ID，VALID_FROM和VALID_TO，ACC_ID，VALID_FROM上有唯一键。

ACCOUNT_BUSII_FUNCTIONS（子表），其中列为ACC_ID，BUSINESS_FUNCTION，VALID_FROM和VALID_TO，ACC_ID，BUSINESS_FUNCTION，VALID_FROM上有唯一键。

VALID_FROM和VALID_TO是日期。

我需要建立一个关系，其中在ACCOUNTS（父表）中删除的每个记录都应检查属于同一日期范围的子记录。同样，在插入子级之前，请检查父级是否存在有效日期范围。

显然，我不能使用外键约束，因为涉及日期范围。

尝试编写函数并调用CHECK约束，但由于CHECK约束不允许用户定义函数，因此无效。

无能为力......请帮助......

干杯 TZH

Answer 1

我认为触发器比功能更好。尝试类似：

CREATE TRIGGER ACCOUNTS_BD
  BEFORE DELETE ON ACCOUNTS
  FOR EACH ROW
DECLARE
  nChild_rows  NUMBER:
BEGIN
  SELECT COUNT(*)
    INTO nChild_rows
    FROM ACCOUNT_BUSII_FUNCTIONS a
    WHERE a.ACC_ID = :OLD.ACC_ID AND
          (:OLD.VALID_FROM BETWEEN a.VALID_FROM AND a.VALID_TO OR
           :OLD.VALID_TO BETWEEN a.VALID_FROM AND a.VALID_TO OR
           a.VALID_FROM BETWEEN :OLD.VALID_FROM AND :OLD.VALID_TO OR
           a.VALID_TO BETWEEN :OLD.VALID_FROM AND :OLD.VALID_TO);

  IF nChild_rows > 0 THEN
    RAISE_APPLICATION_ERROR(-20001, 'Child rows found when deleting from ACCOUNTS');
  END IF;
END ACCOUNTS_BD;

CREATE TRIGGER ACCOUNT_BUSII_FUNCTIONS_BI
  BEFORE INSERT ON ACCOUNT_BUSII_FUNCTIONS
  FOR EACH ROW
DECLARE
  nParent_rows  NUMBER;
BEGIN
  SELECT COUNT(*)
    INTO nParent_rows
    FROM ACCOUNTS a
    WHERE a.ACC_ID = :NEW.ACC_ID AND
          (:NEW.VALID_FROM BETWEEN a.VALID_FROM AND a.VALID_TO OR
           :NEW.VALID_TO BETWEEN a.VALID_FROM AND a.VALID_TO OR
           a.VALID_FROM BETWEEN :NEW.VALID_FROM AND :NEW.VALID_TO OR
           a.VALID_TO BETWEEN :NEW.VALID_FROM AND :NEW.VALID_TO);

  IF nParent_rows = 0 THEN
    RAISE_APPLICATION_ERROR(-20002, 'No parent row found when inserting into ' ||
                                    'ACCOUNT_BUSII_FUNCTIONS');
  END IF;
END ACCOUNT_BUSII_FUNCTIONS_BI;

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