PLS-00302:必须声明组件 - 无法解析 [英] PLS-00302: component must be declared- Unable to resolve

问题描述

我在 SQL Developer 中尝试了以下程序，但遇到了一些问题:

I tried the below program in SQL developer and facing some issues:

declare
  cursor emp_complex_cur is
    select e.fname,d.dlocation
      from employee e, dept_location d
     where e.dno=d.dnumber;
  emp_max_id integer;
  type emp_complex_rec is record(rname employee.fname%type,rlocation dept_location.dlocation%type);
begin
  open emp_complex_cur;
  for emp_complex_rec in emp_complex_cur loop
    fetch emp_complex_cur into emp_complex_rec;
    dbms_output.put_line('The employee id is: '||emp_complex_rec.rname||' and the employee''s location is '||emp_complex_rec.rlocation);
  close emp_complex_cur;
end;

我在声明变量 rname 时遇到错误，尽管它已在记录中正确声明.

I am getting the error to declare the variable rname though it has been properly declared in the record.

推荐答案

尝试:

begin
  for emp_complex_rec in (select e.fname,
                                 d.dlocation
                            from employee e
                            INNER JOIN dept_location d
                              ON (e.dno = d.dnumber))
  loop
    dbms_output.put_line('The employee id is: ' ||
                         emp_complex_rec.rname ||
                         ' and the employee''s location is ' ||
                         emp_complex_rec.rlocation);
  end loop;
end;

原始代码的问题是 emp_complex_rec 作为类型的定义与作为游标循环变量的 emp_complex_rec 的定义发生冲突.也不需要显式游标定义 - IMO 将 SELECT 放在 FOR 循环中更容易、更清晰.

The problem with the original code was that the definition of emp_complex_rec as a type was colliding with the definition of emp_complex_rec as a cursor loop variable. The explicit cursor definition isn't needed either - IMO putting the SELECT in the FOR loop is easier and clearer.

分享和享受.

这篇关于PLS-00302:必须声明组件 - 无法解析的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！