强制值为空时无法引发 VALUE_ERROR

Posted 2023-03-27

【中文标题】强制值为空时无法引发 VALUE_ERROR

【英文标题】：Unable to raise VALUE_ERROR when mandatory values are null

【发布时间】：2019-03-30 00:34:54

【问题描述】：

employeeid、employeename 和 jobid 是我的表中的强制 NOT NULL 字段。如果其中任何一个为空，我想引发 VALUE_ERROR 异常，尽管我没有得到预期的结果。

CREATE OR REPLACE PROCEDURE insert_employee(
    p_employeeid IN employees.employeeid%TYPE,
    p_employeename IN employees.employeename%TYPE,
    p_phone IN employees.phone%TYPE,
    p_jobid IN employees.jobid%TYPE,
    p_salary IN employees.salary%TYPE,
    p_managerid IN employees.managerid%TYPE,
    p_departmentid IN employees.departmentid%TYPE

) 

IS

BEGIN
    IF p_employeeid = NULL THEN
        RAISE VALUE_ERROR;

    ELSE IF p_employeename = NULL THEN
        RAISE VALUE_ERROR;

    ELSE IF p_jobid = NULL THEN
        RAISE VALUE_ERROR;

    ELSE
    INSERT INTO employees (employeeid, employeename, phone, jobid, salary, managerid, departmentid)
    VALUES(p_employeeid, p_employeename, p_phone, p_jobid, p_salary, p_managerid, p_departmentid);

    END IF;

EXCEPTION
    WHEN VALUE_ERROR THEN
    RAISE_APPLICATION_ERROR (06502, 'VALUE_ERROR');

END;

我收到此错误： 错误：PROCEDURE INSERT_EMPLOYEE Line/Col：30/1 PLS-00103：在预期以下情况之一时遇到符号“EXCEPTION”：（begin case declare end exit for goto if loop mod null pragma raise return select update while with

【参考方案1】：

这显然是错误的，有几个原因。

应该使用IS NULL 或IS NOT NULL 将值与NULL 进行比较，而不是使用等号= RAISE_APPLICATION_ERROR 的第一个参数应该是一个介于 -20001 和 -20999 之间的数字（不过，正如您所说，VALUE_ERROR 是一个预定义的异常，您不必重新引发它）

我把它缩短了（不想白白打字）：

SQL> CREATE OR REPLACE PROCEDURE insert_employee(
  2    p_employeeid     IN               NUMBER,
  3    p_employeename   IN               NUMBER,
  4    p_jobid          IN               NUMBER
  5  )IS
  6  BEGIN
  7    IF p_employeeid IS NULL THEN
  8      RAISE value_error;
  9    ELSIF p_employeename IS NULL THEN
 10      RAISE value_error;
 11    ELSIF p_jobid IS NULL THEN
 12      RAISE value_error;
 13    ELSE
 14      NULL;
 15    END IF;
 16  EXCEPTION
 17    WHEN value_error THEN
 18      raise_application_error(-20001,'This is a VALUE_ERROR');
 19  END;
 20  /

Procedure created.

SQL>
SQL> EXEC insert_employee(1,2,NULL);
BEGIN insert_employee(1,2,NULL); END;

*
ERROR at line 1:
ORA-20001: This is a VALUE_ERROR
ORA-06512: at "SCOTT.INSERT_EMPLOYEE", line 18
ORA-06512: at line 1


SQL> EXEC insert_employee(1,2,3);

PL/SQL procedure successfully completed.

SQL>