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Oracle PLSQL 在游标中用while循环实例程序

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2016-06-07 17:45:521173browse

Oracle PLSQL 在游标中用while循环实例程序

Oracle PLSQL 在游标中用while循环实例程序

Oracle PLSQL 在游标中用while循环实例程序

declare
 cursor emp_cur is select * from emp;
 v_emp emp%rowType;
 begin
 open emp_cur;
 
 while emp_cur%notfound --while肯定要跟loop一起用的 且是控制循环体的
loop
 fetch emp_cur into v_emp;
 dbms_output.put_line(v_emp.ename);

 end loop;
 close emp_cur;
 end;

//实例二

关于cursor循环,有两种方式:
1. 使用loop, exit (不用while)
如:
 loop
 fetch emp_cur into v_emp;
 exit when emp_cur%notfound;
 dbms_output.put_line(v_emp.ename);
 end loop;
2. 使用while, 这时先要fetch
 fetch emp_cur into v_emp;
 while (emp_cur%found)
 loop
  dbms_output.put_line(v_emp.ename);
  fetch emp_cur into v_emp;
 end loop; 

?>

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