create table tb_storage
(id number(9),
shopid varchar(10),
storage number(10) not null
); table created
create table tb_shop(
id number(9),
shopid varchar(10),
shopname varchar(20)
);table created
insert into tb_storage values(1,1,20);
insert into tb_storage values(2,2,30);
insert into tb_storage values(3,3,33);
insert into tb_shop values(2,'s002','空調');
insert into tb_shop values(1,'s001','彩電');
insert into tb_shop values(3,'s003','電腦');
create or replace procedure proc_storage
(param_shopid number,--商品編號
param_storagequantity int ,--出庫數量
param_shopname out varchar2,--出庫商品名稱
param_oldstorage out number,--原有庫存
param_storage out number,--現在庫存
param_flag out number--執行狀態 0成功，1找不到，2庫存不足)as
begin
select storage into param_oldstorage from tb_storage where shopid=param_shopid;
select shopname into param_shopname from tb_shop where id=param_shopid;
if param_oldstorage < param_storagequantity then
param_flag:=2;
else
update tb_storage set storage=storage-param_storagequantity where shopid=param_shopid;
param_oldstorage:=param_oldstorage-param_storagequantity;
param_flag:=0;
end if;
exception
when no_data_found then
param_flag:=1;
end;
/declare
v_shopid number(5):=2;
v_storagequantity int :=10;
v_shopname varchar2(10);
v_oldstorage number(10);
v_storage number(10);
v_flag number(2);
begin
proc_storage(
v_shopid,
v_storagequantity ,
v_shopname,
v_oldstorage,
v_storage,
v_flag
);case v_flag
when 0 then-- 成功
dbms_output.put_line('出庫商品：'||v_shopname);
dbms_output.put_line('出庫數量：'||v_storagequantity);
dbms_output.put_line('原有庫存：'||v_oldstorage );
dbms_output.put_line('現在庫存：'||v_storage );
when 1 then
dbms_output.put_line('找不到對應的商品！' );
when 2 then
dbms_output.put_line('庫存不足，不能出庫！' );
end case;
end;
/
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