PL/SQL : i have a function but there is an error : "in a procedure,RETURN can not contain an expression"

Question

这是我的代码：

CREATE OR REPLACE FUNCTION customer_city_function(city_in IN VARCHAR2)
RETURN NUMBER
AS
  number_cus NUMBER := 0;

  CURSOR cus_cur IS
    SELECT COUNT(*)
      FROM customer
     WHERE customer_city = city_in;
BEGIN
  IF city_in IS NOT NULL THEN
    OPEN cus_cur;
    FETCH cus_cur INTO number_cus;
    CLOSE cus_cur;
  END IF;

  RETURN number_cus;
END;
/

这是警告：

Error starting at line : 1 in command -
CREATE OR REPLACE FUNCTION customer_city_function(city_in IN VARCHAR2)
RETURN NUMBER
AS
  number_cus NUMBER := 0
Error report -
SQL Command: functıon CUSTOMER_CITY_FUNCTION
Failed: Warning: executing is completed with a warning


Error starting at line : 5 in command -
CURSOR cur_cur IS
Error report -
Unknown Command


Error starting at line : 6 in command -
SELECT COUNT(*)
    FROM costumer
    WHERE customer_city=city_in
Error at Command Line : 8 Column : 25
Error report -
SQL Error: ORA-00904: "CITY_IN": undefined variable
00904. 00000 -  "%s: invalid identifier"
*Cause:    
*Action:


Error starting at line : 9 in command -
BEGIN
  IF city_in IS NOT NULL
  THEN
    OPEN cus_cur;
    FETCH cus_cur INTO number_cus;
    CLOSE cus_cur;
  END IF;
RETURN (number_cus);
END;

Error report -
ORA-06550: row 2, column 6:
PLS-00201: 'CITY_IN' variable should been defined
ORA-06550: row 2, column 3:
PL/SQL: Statement ignored
ORA-06550: row 8, column 1:
PLS-00372: in a procedure, RETURN can not contain an expression
ORA-06550: row 8, column 1:
PL/SQL: Statement ignored
06550. 00000 -  "line %s, column %s:\n%s"
*Cause:    Usually a PL/SQL compilation error.
*Action:

我的错误在哪里？我找不到它，它没有任何意义。（我用我的语言翻译了这条警告信息。我希望我做对了。）

我刚刚在 Command Window 中尝试过它并且有效。为什么它在 Oracle SQL 开发人员 sql 工作表中不起作用？

Answer 1

您发布的代码没有任何问题。问题可能出在您的客户或您编译代码的方式上。

正如您在标签中提到的 PL/SQL Developer，您可能在 SQL 工作表中有一些额外的字符，并且您是编译函数作为脚本，因此编译器发现它是错误的。

下面是SQL*Plus中的demo，没有报错：

SQL> CREATE OR REPLACE FUNCTION customer_city_function(i_deptno IN number)
  2  RETURN NUMBER
  3  AS
  4  number_cus NUMBER := 0;
  5  CURSOR cus_cur IS
  6  SELECT COUNT(*)
  7  FROM emp
  8  WHERE deptno=i_deptno;
  9  BEGIN
 10    IF i_deptno IS NOT NULL
 11    THEN
 12    OPEN cus_cur;
 13    FETCH cus_cur INTO number_cus;
 14    CLOSE cus_cur;
 15  END IF;
 16  RETURN number_cus;
 17  END;
 18  /

Function created.

SQL> sho err
No errors.
SQL> SELECT customer_city_function(10) FROM DUAL;

CUSTOMER_CITY_FUNCTION(10)
--------------------------
                         3

SQL>

我的代码中唯一的区别是我使用了 EMP table 而不是 CUSTOMERS table 并且输入参数是 DEPTNO 而不是CITY_IN。其余一切都一样，函数 编译和执行 没有任何错误。

PL/SQL : i have a function but there is an error : "in a procedure,RETURN can not contain an expression"

PL/SQL : i have a function but there is an error : "in a procedure,RETURN can not contain an expression"

oracle

plsql

oracle-sqldeveloper

stored-functions

ora-06550