Question

在'emprunter'表上创建一个触发器时，我试图比较来自另一个表'exemplaire.numexemplaire'的值，它应该是一个INTEGER。但我一直得到同样的错误：

错误（4,7）：PL / SQL：忽略SQL语句
错误（7,15）：PL / SQL：ORA-00904：“EMPRUNTER”。“NUMEXEMPLAIRE”：无效的标识符

如何检索来自另一个表的字段的值（exemplaire.numexemplaire）？

CREATE OR REPLACE TRIGGER BIEmprunter
BEFORE INSERT OR UPDATE OF numexemplaire ON emprunter
FOR EACH ROW
DECLARE 
      livreEmpruntable    INTEGER;
BEGIN 
      SELECT  exemplaire.empruntable 
      INTO    livreEmpruntable
      FROM    exemplaire  
      WHERE   emprunter.numexemplaire = exemplaire.numexemplaire;

  IF livreEmpruntable != 1 THEN
    raise_application_error(-20000, 'exemplaire non empruntable');
  END if;
END;

更新1

感谢您的回答，但我一直在尝试测试触发器时出现此错误......

SQL Error: ORA-04098: trigger 'EQUIPE10.ABONNEMENTPASAJOUR' is invalid and failed re-validation
04098. 00000 -  "trigger '%s.%s' is invalid and failed re-validation"
*Cause:    A trigger was attempted to be retrieved for execution and was
           found to be invalid.  This also means that compilation/authorization
           failed for the trigger.
*Action:   Options are to resolve the compilation/authorization errors,
           disable the trigger, or drop the trigger.

更新2 再次感谢您的回答，触发器现在可以编译。但是现在我正在尝试在插入值时使其工作，但我一直收到错误，因为还没有数据......

INSERT INTO emprunter
  VALUES (2, 1, 18, '17-02-01', null);

Error report -
SQL Error: ORA-01403: no data found
ORA-06512: at "EQUIPE10.BIEMPRUNTER", line 4
ORA-04088: error during execution of trigger 'EQUIPE10.BIEMPRUNTER'
01403. 00000 -  "no data found"
*Cause:    No data was found from the objects.
*Action:   There was no data from the objects which may be due to end of fetch.

Answer 1

您想加入两个表：

#!/bin/sh 
exec /usr/bin/ssh -o UserKnownHostsFile=/dev/null
StrictHostKeyChecking=no -i /home/ec2-user/.ssh/id_rsa "$@"

此外，上述连接查询可能会返回多行，并且调用将导致异常（截至目前未被捕获）

ORA-01422：精确提取返回超过请求的行数

Answer 2

我想您想使用:new来访问触发触发器的记录：

CREATE OR REPLACE TRIGGER BIEmprunter
BEFORE INSERT OR UPDATE OF numexemplaire ON emprunter
FOR EACH ROW
DECLARE 
      livreEmpruntable    INTEGER;
BEGIN 
      SELECT  exemplaire.empruntable 
      INTO    livreEmpruntable
      FROM    exemplaire  
      WHERE   :new.numexemplaire = exemplaire.numexemplaire;

  IF livreEmpruntable != 1 THEN
    raise_application_error(-20000, 'exemplaire non empruntable');
  END if;
END;

PL / SQL无效标识符

2 个答案: