create table student
(
id number,
sname varchar2(20)
)
CREATE OR REPLACE PROCEDURE stu_proc
(
--多个用逗号隔开
v_id IN NUMBER
) IS
--多个用分号隔开
v_max_id NUMBER;
v_name VARCHAR2(20);
v_raise EXCEPTION;
BEGIN
SELECT MAX(a.id) INTO v_max_id FROM student a;
IF v_id>v_max_id THEN
RAISE v_raise;
END IF;
SELECT o.sname INTO v_name FROM student o WHERE o.id=v_id;
dbms_output.put_line('学生名称为：'||v_name);
EXCEPTION
WHEN v_raise THEN
RAISE_APPLICATION_ERROR(-20010, 'v_id not exists!');
WHEN NO_DATA_FOUND THEN
RAISE_APPLICATION_ERROR(-20011, 'ERROR：不存在！');
END stu_proc;