Question

以下是我在存储过程中的内容

CREATE OR REPLACE PROCEDURE GET_USER (IN IN_USER_NAME VARCHAR(256))
    DYNAMIC RESULT SETS 1
P1: BEGIN
    -- Declare cursor
    DECLARE cursor1 CURSOR WITH RETURN for

        IF (IN_USER_NAME IS NULL) THEN
            SELECT BLUEMSP.USERS.USER_ID FROM BLUEMSP.USERS;
        END IF;

    -- Cursor left open for client application
    OPEN cursor1;
END P1

我在If语句行显示

时出错

Multiple markers at this line
"." was expected instead of "(".
- "JOIN" was expected instead of "THEN".
- "IF (IN_USER_NAME IS NULL) THEN
        SELECT BLUEMSP.USERS.USER_ID FROM BLUEMSP." appears to be misplaced.
- "(" was expected after "IS".

为什么这不起作用？

由于

Answer 1

您不能在游标声明中使用IF语句，因为IF是PL / SQL，并且游标声明必须是纯SQL。

Answer 2

CREATE OR REPLACE PROCEDURE GET_USER (IN_USER_NAME IN  VARCHAR2)
IS
xxx BLUEMSP.USERS.USER_ID%TYPE; 
CURSOR cursor1 IS SELECT BLUEMSP.USERS.USER_ID FROM BLUEMSP.USERS;
BEGIN
IF (IN_USER_NAME IS NULL) THEN               
   OPEN cursor1;
   FETCH cursor1 INTO xxx;
   ...
END IF
CLOSE cursor1;
END

PL / SQL if语句错误

2 个答案: