plsql - PL SQL 替换字符串问题

Question

嗨，我正在用 PL SQL 编写一个过程，我需要在其中检索一个字符串并替换其中的一些值。我的问题是，如果我在其中传递变量，则替换语句不起作用。

tempPrewMonth      VARCHAR2(20);
tempMonth          VARCHAR2(20);
link               VARCHAR(400);


//First of all i stored values in the variables tempPrewMonth and  tempMonth

SELECT to_char((c.month-1),'09')
       INTO tempPrewMonth
       FROM dual;


SELECT to_char((c.month),'09')
        INTO tempMonth
        FROM dual;


//Replace the  "tempPrewMonth" in the "link" variable with "tempMonth" value (this part doesn't work. I don't get any error but the replacement doesn't work)


EXECUTE IMMEDIATE 'select replace (:1,:2,:3)                
                    from dual' 
INTO link
USING link,tempPrewMonth,tempMonth ;

在此先感谢您的帮助。

Answer 1

使用to_char(...,'fm09')而不是to_char(...,'09').