嵌套 IF 语句的 PL/SQL 错误答案

【问题标题】：PL/SQL Error With Nested IF statements嵌套 IF 语句的 PL/SQL 错误
【发布时间】：2013-08-23 18:10:49
【问题描述】：

Apex 4.2

我在下面有以下 pl/sql 代码块，但是每当我在 APex 中运行它时，我都会不断收到错误消息：

ORA-06550：第 35 行，第 4 列：PLS-00103：遇到符号“;”预期以下情况之一时：如果

DECLARE
   show_changes BOOLEAN;
   l_exists INTEGER;

BEGIN

Select count(*) into l_exists
From dba_role_privs
where grantee = upper(:APP_USER) and
(granted_role = 'SURVEY_JOB_SUID' or granted_role = 'SURVEY_SUID');

IF l_exists = 0 THEN            /* unauthorized */
   IF :P32_SURVEY_JOB_REQUEST_ID IS NOT NULL  AND (:P32_SUBMISSION_DATE IS NULL     AND :P32_LOCK_DATE IS NULL) THEN   
           show_changes := TRUE;
   IF :P32_SURVEY_JOB_REQUEST_ID IS NOT NULL AND (:P32_SUBMISSION_DATE IS NOT NULL AND :P32_LOCK_DATE IS NULL) THEN
      show_changes := TRUE;
   IF :P32_SURVEY_JOB_REQUEST_ID IS NOT NULL AND (:P32_SUBMISSION_DATE IS NOT NULL     AND :P32_LOCK_DATE IS NOT NULL) THEN
          show_changes := FALSE;    
END IF;
ELSE                          /* authorized */  
   IF :P32_SURVEY_JOB_REQUEST_ID IS NOT NULL  AND (:P32_SUBMISSION_DATE IS NULL AND :P32_LOCK_DATE IS NULL) THEN   
           show_changes := TRUE;
   IF :P32_SURVEY_JOB_REQUEST_ID IS NOT NULL AND (:P32_SUBMISSION_DATE IS NOT NULL AND :P32_LOCK_DATE IS NULL) THEN
      show_changes := TRUE;
   IF :P32_SURVEY_JOB_REQUEST_ID IS NOT NULL AND (:P32_SUBMISSION_DATE IS NOT NULL AND :P32_LOCK_DATE IS NOT NULL) THEN
      show_changes := TRUE;

END IF;
Return show_changes;
END;

我不确定是什么问题。任何帮助将不胜感激。提前致谢。

【问题讨论】：

IF-条件选择语句的语法错误。请查看PL/SQL Control Statements。

标签： plsql oracle-apex

【解决方案1】：

IF 始终必须与 END IF 配对，ELSE 位于 END IF 之前。如果您想在外部 IF 的两个分支中的每个分支中都有三个单独的 IF 语句，那么您需要类似

IF l_exists = 0
THEN
  IF :P32_SURVEY_JOB_REQUEST_ID IS NOT NULL  AND 
    (:P32_SUBMISSION_DATE IS NULL     AND :P32_LOCK_DATE IS NULL) 
  THEN   
           show_changes := TRUE;
  END IF;
  IF :P32_SURVEY_JOB_REQUEST_ID IS NOT NULL AND 
     (:P32_SUBMISSION_DATE IS NOT NULL AND :P32_LOCK_DATE IS NULL) 
  THEN
      show_changes := TRUE;
  END IF;
  IF :P32_SURVEY_JOB_REQUEST_ID IS NOT NULL AND 
     (:P32_SUBMISSION_DATE IS NOT NULL     AND :P32_LOCK_DATE IS NOT NULL) 
  THEN
          show_changes := FALSE;    
  END IF;
ELSE
  <<repeat the pattern>>
END IF;

不过，我的猜测是，您真的不希望在每个分支中有三个单独的 IF 语句。我的猜测是你想要一个带有ELSIF 的IF 语句

IF l_exists = 0
THEN
  IF :P32_SURVEY_JOB_REQUEST_ID IS NOT NULL AND 
    (:P32_SUBMISSION_DATE IS NULL     AND :P32_LOCK_DATE IS NULL) 
  THEN   
           show_changes := TRUE;
  ELSIF :P32_SURVEY_JOB_REQUEST_ID IS NOT NULL AND 
       (:P32_SUBMISSION_DATE IS NOT NULL AND :P32_LOCK_DATE IS NULL) 
  THEN
      show_changes := TRUE;
  ELSIF :P32_SURVEY_JOB_REQUEST_ID IS NOT NULL AND 
       (:P32_SUBMISSION_DATE IS NOT NULL     AND :P32_LOCK_DATE IS NOT NULL) 
  THEN
          show_changes := FALSE;    
  END IF;
ELSE
  <<repeat the pattern>>
END IF;

【讨论】：