SQL server 笔记7

--进出货，存储过程的应用实例

create database mydb --创建数据库
go
use mydb --连接数据库
go
--水果表
create table Fruit
(
    Ids varchar(50) primary key,
    [Name] varchar(50) not null,
    Price decimal(8,2),
    Source varchar(50),
    Stack varchar(50),
    Numbers int,    --库存数量
    [Image] varchar(50)
)
go
insert into fruit values('k001','苹果',2.4,'烟台','2',100,'image/0.gif')
insert into fruit values('k002','菠萝',1.4,'广东','3',100,'image/1.gif')
insert into fruit values('k003','桔子',2.4,'福州','3',100,'image/2.gif')
insert into fruit values('k004','葡萄',2.4,'新缰','2',100,'image/3.gif')
insert into fruit values('k005','樱桃',2.4,'青岛','4',100,'image/4.gif')
insert into fruit values('k006','桃子',2.4,'花果山','5',100,'image/5.gif')
insert into fruit values('k007','香蕉',2.4,'济南','5',100,'image/6.gif')

--用户表
create table Login
(
    UserName varchar(50) primary key,    --用户名
    [Name] varchar(50),    --真实姓名
    Password varchar(50),    --密码    
    Account decimal(18,2)    --账户余额
)
go
insert into login values('zhangsan','张三','666666',50)
insert into login values('lisi','李四','666666',50)
insert into login values('wangwu','王五','666666',50)

--订单表
create table Orders
(
    Code varchar(50) primary key,    --以“用户名yyyyMMddhhmmssms”的形式作主键
    UserName varchar(50) references Login(Username),    --订购人员代号
    OrderTime datetime,    --订购时间
)
go

--订单内容表
create table OrderDetails
(
    Ids int identity primary key,
    OrderCode varchar(50) references Orders(Code),--订单号
    FruitCode varchar(50) references Fruit(Ids),--水果代号
    [Count] int ,    --水果的个数
)
go

select * from fruit
select * from login
select * from orders
select * from orderdetails

----进销存存储过程
use mydb
go
select*from Fruit
create proc jinchuhuo --创建存储过程
@ids varchar(50),--输入参数
@name varchar(50),
@price decimal(8,2),
@source varchar(50),
@stack int,
@numbers int,--正数进货，负数出货
@image varchar(50)
as
    if @numbers>0 --正数则执行以下操作
    begin
    declare @shuliang1 int --声明一个变量，来接收查询结果
    select @shuliang1=COUNT(*)from Fruit where ids=@ids--查询库中有木有这种水果
        if @shuliang1>0--有，修改数据库
        begin
        declare @shuliang3 int--声明一个变量，来接收查询结果
        select @shuliang3=Numbers  from Fruit where Ids=@ids --查询这种水果有多少
        update Fruit set Numbers=Numbers+@numbers where Ids=@ids --修改表
        print '已修改库存，现有存货' 
        return @shuliang3+@numbers --返回值
        end
        else--木有这种水果，则插入这条新的信息
        begin
        insert into Fruit values(@ids,@name,@price,@source,@stack,@numbers,@image)
        print '已经新增进货数据，现有库存'
        return @numbers --返回值
        end
    end
    else --小于0，则出货
    begin
    declare @shuliang2 int
    select @shuliang2=COUNT(*)from Fruit where ids=@ids--查询库中有木有这种水果
        if @shuliang2>0
        begin
        declare @shuliang4 int
        select @shuliang4=Numbers  from Fruit where Ids=@ids
            if @shuliang4>ABS(@numbers) --库存数量足够，则出库，修改数据库
            begin
            update Fruit set Numbers=Numbers+@numbers where Ids=@ids
            print '出货成功，剩余库存'
            return @shuliang4+@numbers --返回值
            end
            else
            begin
            print '库存数量不足，现有库存'
            return @shuliang4 --返回值
            end
        end
        else
        begin
        print '木有这种水果，木法出货'
        end
    end
go

select*from Fruit
declare @a int --声明一个变量，来接收存储过程jinchuhuo的返回值
exec @a=jinchuhuo 'k009','西瓜','3.7','青州','2','-100','image/7.gif' --输入参数
print @a --显示返回值