Oracle PLSQL Demo - 17.游标查询个别字段（非整表）

declare

    Type ref_cur_variable IS REF cursor;
    cur_variable ref_cur_variable;
    v_empno scott.emp.empno%type;
    v_ename scott.emp.ename%type;

    v_sql varchar2(100) := 'select t.empno, t.ename from scott.emp t';

begin

    Open cur_variable For v_sql;
    
    Loop
        fetch cur_variable
            InTo v_empno, v_ename;
        Exit When cur_variable%NotFound;
        dbms_output.put_line(cur_variable%rowcount || ' -> ' || v_empno ||
                             '   ' || v_ename);
    End Loop;
    Close cur_variable;

end;