复习了一下序列，数据库存储过程的写法

序列：
create sequence my_suquence  --序列名称
minvalue 0                   --序列最小值
start with 0                 --序列起始值
maxvalue 20                  --序列最大值
increment by 5               --序列的增长值
nocache                      --不预先在内存中缓存
cycle;                       --达到最大值后再重新循环

--删除序列
drop my_suquence;
--调用序列
my_suquence.nextval          --下一个值
my_suquence.currval          --当前值

 

 

create or replace procedure
  insert_student(
    v_student_id varchar2,
    v_student_name varchar2,
    v_college_major varchar2,
    v_status varchar2,
    v_state varchar2,
    v_license_no varchar2
  )
 is
    check_constraint_violation exception;
    pragma exception_init(check_constraint_violation,-2290);
 begin
      insert into students1 values(
                v_student_id ,
                v_student_name ,
                 v_college_major ,
                 v_status ,
                 v_state ,
                 v_license_no
     
      );
      dbms_output.put_line('insert complete');
exception
          when dup_val_on_index then
          dbms_output.put_line('违反唯一性约束.');
          when check_constraint_violation then
          dbms_output.put_line('检查性约束。');
end;
     
exec insert_student()

--带一个入参的存储过程
create or replace procedure update_info
(xm in char)
as
begin
select zxf into xf from xs where xm=xm;
if xf>60 then
   update xs set bz='三好学生' where xm=xm;
end if;
if xf<35 then
   update xs set bz='学分未修满' where xm=xm;
end if;
end update_info;
exec update_info;

--带一个入参和出参的存储过程
 CREATE OR REPLACE PROCEDURE count_num
 (     sex IN char,
       num OUT number  )
 AS
 BEGIN
  IF sex=’男’ THEN
   SELECT COUNT(XB) INTO num
    FROM XS
    WHERE XB=’男’;
  ELSE
   SELECT COUNT(XB) INTO num
    FROM XS
    WHERE XB=’女’;
  END IF;
 END count_num;
在调用过程count_num时，需要先定义OUT类型参数，调用如下：
 DECLARE
  man_num NUMBER;
 BEGIN
  count_num(‘男’,man_num);
 END;