set serveroutput on DECLARE cursor cemp is select ename from emp where deptno=50; pename emp.ename%type; --自定义异常 no_emp_found exception; begin open cemp; fetch cemp into pename; if cemp%notfound then raise no_emp_found; end if; close cemp; exception when no_emp_found thenDBMS_OUTPUT.PUT_LINE ( ' custom exception ' ); End ;