Question

这是我的程序：

create or replace procedure emp_lookup
 (empno   IN  emp55.empno%TYPE,
  salary  OUT emp55.sal%TYPE,
  empname OUT emp55.ename%TYPE)
is
begin 
  select sal , ename INTO salary, empname
  from   emp55 
  where  empno=empno;

EXCEPTION WHEN NO_DATA_FOUND THEN empname:='null';
  salary:=-1;
END;

这是主叫代码：

SET SERVEROUTPUT ON

DECLARE 
  employee_name emp55.ename%TYPE;
  employee_salary emp55.sal%TYPE;
BEGIN
  emp_lookup (3244,salary,empname);
END;
/

执行时会出现此错误：

Error starting at line : 3 in command -
DECLARE 
  employee_name emp55.ename%TYPE;
  employee_salary emp55.sal%TYPE;
BEGIN
  emp_lookup (3244,salary,empname);

END;

Error report -
ORA-06550: line 5, column 20:
PLS-00201: identifier 'SALARY' must be declared
ORA-06550: line 5, column 1:
PL/SQL: Statement ignored

它成功运行但我执行时

execute emp_lookup (3346, salary, empname);

显示此错误：

Error starting at line : 16 in command -
BEGIN emp_lookup (3346, salary, empname); END;
Error report -
ORA-06550: line 1, column 27:
PLS-00201: identifier 'SALARY' must be declared
ORA-06550: line 1, column 54:
PL/SQL: Statement ignored

Answer 1

您可以在调用时使用绑定变量作为OUT参数传递。

VARIABLE sal NUMBER
VARIABLE name VARCHAR2(20)
execute emp_lookup (3346, :sal, :name)

如果从PL / SQL块中调用该过程，则应在调用之前正确声明OUT个变量。

DECLARE
salary emp55.sal%TYPE;
empname emp55.ename%TYPE;
BEGIN
   emp_lookup (3346, salary, empname);
END;
/

Answer 2

let express = require('express');
let app = express();

// Define the port to run on
app.set('port', 3000);

// Listen for requests
let server = app.listen(app.get('port'), onHttpConnection);

function onHttpConnection(req, res){
    console.log("starting on " + server.address().port);
}
app.use(express.static('public'));

Answer 3

<强>第一更正您的过程代码（更改输入变量的名称）

需要进行此更正，因为您的where子句（where empno=empno;）始终为true，因此表格的每一行都将被返回 - 这显然不是您的初衷。

create or replace procedure emp_lookup
(in_empno IN emp55.empno%TYPE,
 salary OUT emp55.sal%TYPE,
 empname OUT emp55.ename%TYPE)
IS 
begin 
select sal , ename INTO salary, empname
from emp55 
where empno=in_empno;

EXCEPTION WHEN NO_DATA_FOUND THEN empname:='null';
salary:=-1;

END;

<强> Secod 运行如下：

DECLARE 
  employee_name emp55.ename%TYPE;
  employee_salary emp55.sal%TYPE;
BEGIN
  emp_lookup (3244,employee_salary ,employee_name);
  dbms_output.put_line(employee_name   || ' ' || employee_salary);
END;

Answer 4

你必须申报工资＆＃39;是：即

SET SERVEROUTPUT ON
DECLARE 
  empname emp55.ename%TYPE;
  salary emp55.sal%TYPE;
BEGIN
  emp_lookup (3244,salary,empname);
END;
/

否则，

SET SERVEROUTPUT ON
DECLARE 
  employee_name emp55.ename%TYPE;
  employee_salary emp55.sal%TYPE;
BEGIN
  emp_lookup (3244,employee_salary ,employee_name );
END;
/

我估计，上述任何解决方案都可以解决您的问题。

PLS-00201：必须声明标识符'SALARY'

4 个答案: