不正确地使用“BEGIN”关键字

Question

我在下面的代码中遇到错误。我在问题所在添加了一个错误<------。

错误消息说应该是THEN，但是当我使用THEN 时，它说应该是BEGIN。

Error(27,6): PLS-00103: Encountered the symbol "BEGIN" when expecting one of the following:     then and or The symbol "then" was substituted for "BEGIN" to continue. 
Error(30,6): PLS-00103: Encountered the symbol "END" when expecting one of the following:     , ; return returning 

我做错了什么？

    create or replace PROCEDURE "sp_updateUserPassword"(newUserPwd IN VARCHAR2, curIsoUserUID IN NUMBER)
IS

curUserID NUMBER;
userDateCreated DATE;
oldUserPwd VARCHAR2(255);

BEGIN   
  
  SELECT ISOUID INTO curUserID FROM ISOUSERS WHERE ISOUID=curIsoUserUID;
  SELECT DATECREATE INTO userDateCreated FROM ISOUSERS WHERE ISOUID=curIsoUserUID;
  SELECT PASSWORD INTO oldUserPwd FROM ISOUSERS WHERE ISOUID=curIsoUserUID;
  
  IF(newUserPwd = oldUserPwd)
    THEN
      raise_application_error(-20000, 'The new password must be different from the previous password');
      RETURN;
  END IF;
    
  IF NOT EXISTS
                (
                  SELECT ISOUID 
                  FROM OLDUSERPASSWORDS 
                  WHERE ISOUID=curIsoUserUID
                )
     
     BEGIN           <------------ Error is here
        INSERT INTO OLDUSERPASSWORDS(ISOUID, DATECREATE, DATELASTCHANGE, CURRENTPASS, OLDPASS) 
        VALUES(curUserID, userDateCreated, SYSDATE, newUserPwd, oldUserPwd)
     END;
       

/*raise_application_error(-20000, 'TEST');*/
END "sp_updateUserPassword";

更新

更正了代码，现在看起来像这样：

   IF NOT EXISTS
                (
                  SELECT ISOUID 
                  FROM OLDUSERPASSWORDS 
                  WHERE ISOUID=curIsoUserUID
                )
    THEN     
      BEGIN           
          INSERT INTO OLDUSERPASSWORDS(ISOUID, DATECREATE, DATELASTCHANGE, CURRENTPASS, OLDPASS) 
          VALUES(curUserID, userDateCreated, SYSDATE, newUserPwd, oldUserPwd)
      END;
  END IF;   

我收到此错误：

Error(30,7): PL/SQL: ORA-00933: SQL command not properly ended
Error(31,7): PLS-00103: Encountered the symbol "IF" when expecting one of the following:     ; <an identifier> <a double-quoted delimited-identifier> 

也许这只是我遗漏的一个小错误？

Answer 1

IF THEN ELSE 的 PL/SQL 语法错误

正确的语法是：

IF condition THEN
  statements
END IF;

你的代码是有效的：

IF condition THEN
  BEGIN
    statements
  END;

已更正

IF NOT EXISTS
(
    SELECT ISOUID 
    FROM OLDUSERPASSWORDS 
    WHERE ISOUID=curIsoUserUID
)
THEN

    BEGIN           <------------ Error is NOT here
        INSERT INTO OLDUSERPASSWORDS(ISOUID, DATECREATE, DATELASTCHANGE, CURRENTPASS, OLDPASS) 
        VALUES(curUserID, userDateCreated, SYSDATE, newUserPwd, oldUserPwd);
    END;
END IF;

Answer 2

您遇到了第一个错误，因为您需要在 BEGIN 块之前添加一个 THEN 子句以使 ID 语句的语法完整且正确。

你得到第二个错误：

错误（30,7）：PL/SQL：ORA-00933：SQL 命令未正确结束

因为您还没有完成您的 INSERT 语句。用分号结束它应该可以解决这个错误。

   IF NOT EXISTS
                (
                  SELECT ISOUID 
                  FROM OLDUSERPASSWORDS 
                  WHERE ISOUID=curIsoUserUID
                )
    THEN     
      BEGIN           
          INSERT INTO OLDUSERPASSWORDS(ISOUID, DATECREATE, DATELASTCHANGE, CURRENTPASS, OLDPASS) 
          VALUES(curUserID, userDateCreated, SYSDATE, newUserPwd, oldUserPwd);
      END;
  END IF; 

Answer 3

您忘记了BEGIN 之前的THEN，这与IF NOT EXISTS 一致。