Question

我在pl / sql bloc中使用游标时遇到问题。我有一张名为Angajati(employees)的桌子，我需要显示每个部门的所有员工，例如：

Dep 10:
      John Smith 
      King Steven
Dep 20:
      Henry King
      William
...

当我尝试这样做时，我收到了ORA-06502: PL/SQL: numeric or value error: number precision too large之类的错误，或者我的脚本没有显示任何内容。这是我的代码：

declare

dep_min angajati.id_departament %type;

dep_max angajati.id_departament %type;

id_min angajati.id_angajat %type;


id_max angajati.id_angajat %type;

i angajati.id_angajat %type;

cursor c is select nume, prenume, id_departament, id_angajat from angajati where id_angajat=i;

    r c%rowtype;



begin
    select min(id_departament), max(id_departament) into dep_min, dep_max from angajati;
    select min(id_angajat), max(id_angajat) into id_min, id_max from angajati;

    open c;

    loop
    dbms_output.put_line('...');
    dbms_output.put_line('Departamentul ' || dep_min);

    for i in id_min..id_max
    loop

       fetch c into r;

    if(r.id_departament=dep_min) then
      dbms_output.put_line(r.nume || ' ' || r.prenume );
    else null;
    end if;

    exit when id_min>id_max;
    end loop;

    dep_min:=dep_min+10;
    end loop;
    close c;
end;
/

Answer 1

要获得这样的结果，最好使用以下内容：

Dep 10:
      John Smith 
      King Steven
Dep 20:
      Henry King
      William

PL / SQL代码：

BEGIN
 FOR dep IN (SELECT id_departament,
                                        COUNT(*) cnt
                             FROM angajati
                            GROUP BY id_departament
                            ORDER BY id_departament) LOOP
        dbms_output.put_line('Dep ' || dep.id_departament || '. Count employee ' || dep.cnt);
        FOR empl IN (SELECT * FROM angajati WHERE id_departament = dep.id_departament) LOOP
             dbms_output.put_line(empl.nume || ' ' || empl.prenume);
        END LOOP;
 END LOOP;
END;

Answer 2

正如Stepan在上面的回答中所提到的，这可以通过更简单的方式来完成，但如果你坚持要通过你的方法。可能这有帮助。但这也可以通过SQL来完成。尽可能总是喜欢SQL而不是PLSQL。我现在没有工作空间，所以请原谅任何语法错误。

DECLARE
  dep_min angajati.id_departament%type;
  dep_max angajati.id_departament%type;
  id_min angajati.id_angajat%type;
  id_max angajati.id_angajat%type;
  i angajati.id_angajat%type;
BEGIN
  SELECT MIN(id_departament),
    MAX(id_departament)
  INTO dep_min,
    dep_max
  FROM angajati;

  SELECT MIN(id_angajat),
    MAX(id_angajat)
  INTO id_min,
    id_max
  FROM angajati;

  dbms_output.put_line('...');
  dbms_output.put_line('Departamentul ' || dep_min);
  FOR k IN id_min..id_max
  LOOP
    FOR J IN
    (SELECT nume,
      prenume,
      id_departament,
      id_angajat
    FROM angajati
    WHERE id_angajat=i
    )
    LOOP
      IF(j.id_departament=dep_min) THEN
        dbms_output.put_line(j.nume || ' ' || j.prenume );
      ELSE
        NULL;
      END IF;
    END LOOP;
    dep_min:=dep_min+10;
  END LOOP;
END;
/

Pl / Sql使用游标，有问题

2 个答案: