Oracle 从PL/SQL块中的CASE语句调用过程：面临问题

我创建了下面的块，询问用户选择选项。 然后，每个选项都调用存储过程来处理接收到的信息（无论是要显示的余额还是要针对特定id进行的存款、取款）

`set serveroutput on
DECLARE
  V_CHOICE NUMBER(1)  := &V_CHOICE;
  ID       NUMBER(5)  := &ID;
  AMT      NUMBER(20) := &AMT;
BEGIN
  CASE V_CHOICE
  WHEN 1 THEN
    EXEC SHOW_BALANCE(ID);
  WHEN 2 THEN
    EXEC DEPOSITS (ID ,AMT);
  WHEN 3 THEN
    EXEC WITHDRAWAL (ID, AMT);
  ELSE
    DBMS_OUTPUT.PUT_LINE ('Invalid choice');
  END CASE;
END;
/`

这些过程中的每一个都可以通过传递各自的参数来单独执行，但是，在使用case语句时，我得到了PL/SQL编译错误

`set serveroutput on
DECLARE
  V_CHOICE NUMBER(1)  := &V_CHOICE;
  ID       NUMBER(5)  := &ID;
  AMT      NUMBER(20) := &AMT;
BEGIN
  CASE V_CHOICE
  WHEN 1 THEN
    EXEC SHOW_BALANCE(ID);
  WHEN 2 THEN
    EXEC DEPOSITS (ID ,AMT);
  WHEN 3 THEN
    EXEC WITHDRAWAL (ID, AMT);
  ELSE
    DBMS_OUTPUT.PUT_LINE ('Invalid choice');
  END CASE;
END;
/`

 Error report:
ORA-06550: line 8, column 6:
PLS-00103: Encountered the symbol "SHOW_BALANCE" when expecting one of the following:

   := . ( @ % ;
The symbol ":=" was substituted for "SHOW_BALANCE" to continue.

---

请告知PL/SQL块有什么问题。

您需要删除

EXEC

：

`set serveroutput on
DECLARE
  V_CHOICE NUMBER(1)  := &V_CHOICE;
  ID       NUMBER(5)  := &ID;
  AMT      NUMBER(20) := &AMT;
BEGIN
  CASE V_CHOICE
  WHEN 1 THEN
    EXEC SHOW_BALANCE(ID);
  WHEN 2 THEN
    EXEC DEPOSITS (ID ,AMT);
  WHEN 3 THEN
    EXEC WITHDRAWAL (ID, AMT);
  ELSE
    DBMS_OUTPUT.PUT_LINE ('Invalid choice');
  END CASE;
END;
/`

set serveroutput on;
DECLARE
  V_CHOICE NUMBER(1)  := &V_CHOICE;
  ID       NUMBER(5)  := &ID;
  AMT      NUMBER(20) := &AMT;
BEGIN
  CASE V_CHOICE
  WHEN 1 THEN        SHOW_BALANCE(ID);
  WHEN 2 THEN        DEPOSITS(ID ,AMT);
  WHEN 3 THEN        WITHDRAWAL(ID, AMT);
  ELSE               DBMS_OUTPUT.PUT_LINE('Invalid choice');
  END CASE;
END;
/

---

EXEC是一个SQL*Plus命令，不是PL/SQL命令。非常感谢。@ChinmayDeshpande