SQL - 此过程执行有什么问题

Question

CREATE OR REPLACE procedure verify_employee
(emp_license IN trkdriver.L#%TYPE) 
IS
result VARCHAR2(10);

BEGIN
select e# INTO result
from trkdriver where l#='emp_license';
END;
/

以上是我的程序

SQL> desc trkdriver;
 Name                                      Null?    Type
 ----------------------------------------- -------- ----------------------------

 E#                                        NOT NULL NUMBER(12)
 L#                                        NOT NULL NUMBER(8)
 STATUS                                    NOT NULL VARCHAR2(10)

我试过

SQL> execute verify_employee('10001');
BEGIN verify_employee('10001'); END;

*
ERROR at line 1:
ORA-01722: invalid number
ORA-06512: at "USER1.VERIFY_EMPLOYEE", line 7
ORA-06512: at line 1

我做错了什么，我只想尝试一个简单的程序，根据我输入的员工许可证ID进行选择

Answer 1

您必须删除''，如下所示：

CREATE OR REPLACE procedure verify_employee
(emp_license IN trkdriver.L#%TYPE) 
IS
result VARCHAR2(10);

BEGIN
select e# INTO result
from trkdriver where l#=emp_license;
END;
/

结束它：

execute verify_employee(10001);

Answer 2

l#是数字，您将其与字符串进行比较： ... where l#='emp_license';