删除触发器后的PL SQL不插入记录

我有一个用PL/SQL编写的触发器，用来将删除的记录插入到另一个表中

触发因素如下：

CREATE OR REPLACE TRIGGER keepRemoved
AFTER DELETE
ON schema.table
FOR EACH ROW
DECLARE selection_id varchar2(10) := NULL;
BEGIN
    /* Check if deleted record already exists in destination table by populating variable with that value. */
     BEGIN
       SELECT a.primary_key
       INTO selection_id
       FROM [destinationTable] a
       WHERE a.primary_key = :old.removed_key
         AND a.condition_value = true
         AND a.condition_value2 = 42;
       EXCEPTION
         WHEN NO_DATA_FOUND THEN
           selection_id := NULL;
         WHEN OTHERS THEN
           selection_id := NULL;
      END;

    /* If selection_id is null, meaning that value doesn't exist in the destination table, insert deleted record in destination table */
      IF selection_id IS NULL THEN
        INSERT INTO [destinationTable] a
           (a.primary_key,
            a.user_id,
            a.column2,
            ...
            a.columnN)
        VALUES
            (:old.removed_key,
             SYS_CONTEXT('USERENV','AUTHENTICATED_IDENTITY'),
              123,
              ...
              'MoreText')
       END IF;
       EXCEPTION
         WHEN OTHERS THEN NULL;
 END;

问题是删除记录时，

destinationTable

中没有填充任何内容

---

在上下文中，我永远不会成为删除记录的用户。

你在这里所说的就像伪代码，而不是真实的代码，所以我帮不了你这么多，但我的建议是：

你有错误吗？ 然后按照错误添加调试信息，在dbms_output.put_行中编写一些异常代码来检查它

确保触发器位于执行DML操作的同一个表上

将触发器更改为使用“删除前”

检查目标表中是否存在.primary_键，如果存在，则不会执行插入

---

您好，请改变一种逻辑，如贝娄使用计数，而不是值和空匹配。此外，计数不需要异常处理

CREATE OR REPLACE TRIGGER keepRemoved
AFTER DELETE
ON schema.table
FOR EACH ROW
DECLARE 
selection_count pls_integer:=0
BEGIN
    /* Check if deleted record already exists in destination table by populating variable with that value. */
     BEGIN
       SELECT count(*)
       INTO selection_count
       FROM [destinationTable] a
       WHERE a.primary_key = :old.removed_key
         AND a.condition_value = true
         AND a.condition_value2 = 42;
       EXCEPTION     -- can remove this.
         WHEN NO_DATA_FOUND THEN
           selection_count := 0;
         WHEN OTHERS THEN
           selection_count := 1;  
      END;

    /* If selection_id is null, meaning that value doesn't exist in the destination table, insert deleted record in destination table */
      IF selection_count = 0 THEN
        INSERT INTO [destinationTable] a
           (a.primary_key,
            a.user_id,
            a.column2,
            ...
            a.columnN)
        VALUES
            (:old.removed_key,
             SYS_CONTEXT('USERENV','AUTHENTICATED_IDENTITY'),
              123,
              ...
              'MoreText')
       END IF;
       EXCEPTION
         WHEN OTHERS THEN NULL;
 END; 

---

代码尽可能接近真实的触发器，而无需在其中输入真实的列名。我没有收到任何错误，触发器存在于同一个模式中，并且在同一个表中，作为DML的执行对象。我会尝试删除前，但从我所读到的我应该能够使用后。和#4已经编码到触发器本身中。尝试在运行时调试触发器并查看是否执行异常，替换null；命令异常，任何检测操作（如insert to test table）都异常。如果记录存在于destinationTable中，但条件_值2为41，该怎么办？您可以将ID设置为null，这意味着您将插入具有相同密钥ID的新记录。如果这是PK，则插入将引发一个您忽略的异常。