触发器将同一行复制到另一个表中

Posted 2023-05-09

【中文标题】触发器将同一行复制到另一个表中

【英文标题】：Trigger to copy the same row into another table

【发布时间】：2021-07-14 16:03:27

【问题描述】：

如何获取表 1 到表 2 中的值；这将根据 Table1 的列（订单）复制行

表1：

ID       TICKETID USERNAME FIRSTNAME LASTNAME ORDERS STATUS
SEL00007            Hema1     Hema    Sri       3      New
SEL00008            Romi1     Romi     T        2      New

表2：

ID       TICKETID USERNAME FIRSTNAME LASTNAME ORDERS STATUS
SEL00007            Hema1     Hema    Sri       3      New
SEL00007            Hema1     Hema    Sri       3      New
SEL00007            Hema1     Hema    Sri       3      New
SEL00008            Romi1     Romi     T        2      New
SEL00008            Romi1     Romi     T        2      New

这是我参考了很多其他帖子后才想到的

CREATE OR REPLACE TRIGGER Duplicate_Rows
AFTER INSERT OR UPDATE ON Table1
REFERENCING NEW AS New OLD AS Old
FOR EACH ROW
DECLARE N_Ord NUMBER;
BEGIN
N_Ord := (SELECT (Orders) from Table2);
INSERT INTO UserTable2 (TICKETID,username,firstName,lastName,Status)
SELECT :New.TICKETID,:New.username,:New.firstName,:New.lastName,:New.Status
FROM dual
CONNECT BY LEVEL <= N_Ord; 
END Duplicate_Rows;
/

请帮忙！！

【参考方案1】：

关闭；无需单独选择orders 进入变量；无论如何它都会失败，因为表正在变异，所以触发器看不到它。

触发器：

SQL> CREATE OR REPLACE TRIGGER trg_ai_t1 AFTER
  2    INSERT ON table1
  3    FOR EACH ROW
  4  BEGIN
  5    INSERT INTO table2(
  6      id,
  7      ticketid,
  8      username,
  9      firstname,
 10      lastname,
 11      orders,
 12      status
 13    )
 14      SELECT :new.id,
 15             :new.ticketid,
 16             :new.username,
 17             :new.firstname,
 18             :new.lastname,
 19             :new.orders,
 20             :new.status
 21      FROM dual CONNECT BY
 22        level <= :new.orders;
 23
 24  END;
 25  /

Trigger created.

插入table1:

SQL> INSERT INTO table1(
  2    id,
  3    ticketid,
  4    username,
  5    firstname,
  6    lastname,
  7    orders,
  8    status
  9  )VALUES(
 10    'SEL00007',
 11    NULL,
 12    'Hema1',
 13    'Hema',
 14    'Sri',
 15    3,
 16    'New'
 17  );

1 row created.

结果：

SQL> SELECT *
  2  FROM table1;

ID           TICKETID USERNAME   FIRST LASTN     ORDERS STATU
---------- ---------- ---------- ----- ----- ---------- -----
SEL00007              Hema1      Hema  Sri            3 New

SQL> SELECT *
  2  FROM table2;

ID           TICKETID USERNAME   FIRST LASTN     ORDERS STATU
---------- ---------- ---------- ----- ----- ---------- -----
SEL00007              Hema1      Hema  Sri            3 New
SEL00007              Hema1      Hema  Sri            3 New
SEL00007              Hema1      Hema  Sri            3 New

SQL>

【讨论】：

非常感谢，@Littlefoot！它按预期工作....我已经做了一个多小时了。 :|