Oracle几种游标的写法

第一种方式：

declare 
lv_deptno emp.deptno%type:=10;
lv_ename emp.ENAME%type:='';
cursor find_emps_bydeptno(v_deptno number) is select ename from emp where deptno=v_deptno; 
begin
    open find_emps_bydeptno(lv_deptno); 
    loop
        fetch find_emps_bydeptno into lv_ename;
        exit when find_emps_bydeptno%notfound;
        dbms_output.put_line('name:'||lv_ename);
    end loop;
    close find_emps_bydeptno;
end;

第二种方式：

declare 
lv_deptno emp.deptno%type:=10;
cursor find_emps_bydeptno(v_deptno number) is select ename from emp where deptno=v_deptno; 
begin
    for v_obj in find_emps_bydeptno(lv_deptno)
    loop
        dbms_output.put_line('name:'||v_obj.ename);
    end loop;
end;

第三种方式：

declare 
lv_deptno emp.deptno%type:=10; 
begin
    for v_obj in (select ename from emp where deptno=lv_deptno)
    loop
        dbms_output.put_line('name:'||v_obj.ename);
    end loop;
end;