存储过程oracle中违反了唯一约束

Question

我有以下存储过程：

create or replace PROCEDURE CALCULATE_RECOVERY_HISTORY(p_month IN VARCHAR2) AS 
l_id NUMBER; 
BEGIN
  ADD_LOG_INFO('CALCULATE_RECOVERY_HISTORY', 'Procedure Started');
  
  l_id := SQ_AP_RECOVERY_HISTORY.NEXTVAL;

    INSERT INTO t_ap_recovery_history (ID, RECOVERY_TARGET_MONTH, TARGET_INSTANCE, RECOVERY_PROGRESS, RECOVERY_TARGET, FAILED_TO_RECOVERY, FOCUS_AREA, IDENTIFIER_CLASS, CREATED_ON) 
    SELECT  l_id,
            a_recovery_target_month, 
            a_target_instance, 
            COUNT(CASE WHEN A_IS_RECOVERED = 'Y' THEN 1 END), 
            COUNT(CASE WHEN A_IS_RECOVERED IN ('Y', 'N') THEN 1 END), 
            COUNT(CASE WHEN A_IS_RECOVERED = 'N' THEN 1 END),
            f.focus_area,
            r.identifier_class,
            SYSDATE
            from t_ap_recovery_target t, t_ap_recovery_focusarea f, range r
    where t.a_focus_area_id = f.id and t.a_range_id = r.id
    and t.a_recovery_target_month = p_month
    group by a_target_instance, a_recovery_target_month, f.focus_area, r.identifier_class;
    
      COMMIT;
END CALCULATE_RECOVERY_HISTORY;

当我运行程序时，出现错误

ORA-00001: 违反唯一约束。

我也试过另一种方法是

SELECT  SQ_AP_RECOVERY_HISTORY.NEXTVAL, a_recovery_target_month ... 

但这也会返回另一个错误，即

此处不允许使用序号

我应该在代码中更改什么来解决这个约束问题？

Answer 1

一种选择是让 Oracle 创建 ID。您没有指定您使用的数据库版本，所以肯定会触发是什么会起作用：

create or replace trigger trg_bi_rec_hist
  before insert on t_ap_recovery_history
  for each row
begin
  :new.id := SQ_AP_RECOVERY_HISTORY.NEXTVAL;
end;
/

然后过程将不包含插入 ID 列，即

INSERT INTO t_ap_recovery_history (RECOVERY_TARGET_MONTH, ...)
SELECT a_recovery_target_month, ...

---

另一种选择（如果您的数据库版本支持它）是创建 ID 作为标识列而不是触发器，例如

SQL> create table test
  2    (id number generated always as identity);

Table created.

Answer 2

或者，如果您不想像上一个答案那样创建触发器，则该过程应如下所示：

创建或替换 PROCEDURE CALCULATE_RECOVERY_HISTORY(p_month IN VARCHAR2) AS l_id 号码； 开始 ADD_LOG_INFO('CALCULATE_RECOVERY_HISTORY', '程序开始');

  INSERT INTO t_ap_recovery_history (ID, RECOVERY_TARGET_MONTH, 
    TARGET_INSTANCE, RECOVERY_PROGRESS, RECOVERY_TARGET,
    FAILED_TO_RECOVERY, FOCUS_AREA, IDENTIFIER_CLASS, CREATED_ON) 
  SELECT  SQ_AP_RECOVERY_HISTORY.NEXTVAL,
       a_recovery_target_month, 
       a_target_instance, 
       COUNT(CASE WHEN A_IS_RECOVERED = 'Y' THEN 1 END), 
       COUNT(CASE WHEN A_IS_RECOVERED IN ('Y', 'N') THEN 1 END), 
       COUNT(CASE WHEN A_IS_RECOVERED = 'N' THEN 1 END),
       f.focus_area,
       r.identifier_class,
       SYSDATE
  from t_ap_recovery_target t, t_ap_recovery_focusarea f, range r
  where t.a_focus_area_id = f.id and t.a_range_id = r.id
      and t.a_recovery_target_month = p_month
  group by a_target_instance, a_recovery_target_month, 
    f.focus_area, r.identifier_class;

  COMMIT;

结束 CALCULATE_RECOVERY_HISTORY；

通常，如果您插入选择一次插入大量行，或者大量更新或大量删除或合并，则触发器会对性能产生不利影响。 如果您只有影响少量行的 DML，触发器可能会降低复杂性，尽管我宁愿在存储过程中做更多的事情而在触发器中做的更少。