Oracle触发器中的行号是如何工作的?

CREATE OR REPLACE TRIGGER foo
BEFORE INSERT ON test1 
REFERENCING OLD AS OLD NEW AS NEW 
FOR EACH ROW
DECLARE
n1 NUMBER := 1;
n2 NUMBER := 2;

BEGIN

  -- a comment
  IF :new.n1 IS NULL THEN
    n1 := n2/0;
  END IF;
END;
/

SQL> insert into test1 values (3,'XX','YY',NULL);

insert into test1 values (3,'XX','YY',NULL)

ORA-01476: divisor is equal to zero
ORA-06512: at "XXX.FOO", line 9
ORA-04088: error during execution of trigger 'XXX.FOO'

SQL> select line, text from all_source where name = 'FOO';

      LINE TEXT
---------- --------------------------------------------------------------------------------
         1 TRIGGER foo
         2 BEFORE INSERT ON test1
         3 REFERENCING OLD AS OLD NEW AS NEW
         4 FOR EACH ROW
         5 DECLARE
         6 n1 NUMBER := 1;
         7 n2 NUMBER := 2;
         8 
         9 BEGIN
        10 
        11   -- a comment
        12   IF :new.n1 IS NULL THEN
        13     n1 := n2/0;
        14   END IF;
        15 END;

15 rows selected

您可以看到报告的错误发生在第9行,实际上是源代码中的第13行。

SELECT text
  FROM all_source
  WHERE owner = 'MYSCHEMA'
    AND name = 'FOO_BI'
    AND type = 'TRIGGER'
    AND line = 9;