--定义变量
declare @a int
--变量赋值
set @a =12
--显示变量
print @a
--累加求和
declare @a int,@sum int ,@i int
set @a=10 set @sum=0 set @i=1
while @i<=@a
begin
set @sum=@sum+@i
set @i=@i+1
end
print @sum
declare @pingguo varchar(10)
select @pingguo=price from fruit where ids='k001'
select *From fruit where price != @pingguo
--存储过程
create proc leijia
@a int
as
declare @sum int ,@i int
set @sum=0 set @i=1
while @i<=@a
begin
set @sum=@sum+@i
set @i=@i+1
end
return @sum
go
--接受
declare @sum int
exec @sum=leijia 10
print @sum
--一元二次方程
drop proc yiyuanerci
create proc yiyuanerci
@a decimal,@b decimal,@c decimal
as
declare @daierta decimal,@panduan int
set @daierta=@b*@b-(4*@a*@c)
set @panduan=0
if @a=0
begin
set @panduan=-1
end
else
begin
if @daierta<0
begin
set @panduan=0
end
if @daierta=0
begin
set @panduan=1
end
if @daierta>0
begin
set @panduan=2
end
end
return @panduan
go
declare @jieguo int
exec @jieguo=yiyuanerci 0,2,3
if @jieguo=-1
begin
print '不是一元二次'
end
if @jieguo=0
begin
print '没有实数跟'
end
if @jieguo=1
begin
print '两个相等的实数跟'
end
if @jieguo=2
begin
print '两个不想等的实数跟'
end
--有结果的一元二次方程
drop proc aaaa
create proc aaaa
@a decimal,@b decimal,@c decimal,@jieguo1 decimal out,@jieguo2 decimal out
as
declare @panduan int
set @panduan=0
if @a=0
begin
set @panduan=-1
end
else
begin
declare @daierta decimal
set @daierta=@b*@b-(4*@a*@c)
set @jieguo1=(-@b- SQRT(@daierta) ) / (2 * @a)
set @jieguo2=(-@b+ SQRT(@daierta) ) / (2 * @a)
if @daierta<0
begin
set @panduan=0
end
if @daierta=0
begin
set @panduan=1
end
if @daierta>0
begin
set @panduan=2
end
end
return @panduan
go
declare @jieguo int,@x1 decimal,@x2 decimal
exec @jieguo=aaaa 0,5,2,@x1 out,@x2 out
if @jieguo=-1
begin
print '不是一元二次'
end
if @jieguo=0
begin
print '没有实数跟'
end
if @jieguo=1
begin
print '两个相等的实数跟,为'print @x1
end
if @jieguo=2
begin
print '两个不想等的实数跟'print @x1 print @x2
end
select *from fruit
drop proc shuiguo
--水果进货表
create proc shuiguo
@ids varchar(20),@Name varchar(20),@price decimal,@source varchar(20),@stack int ,@numbers int ,@image varchar(20)
as
--进货
if @numbers>0
begin
declare @count int
select @count =COUNT(*) from fruit as a where a.ids=@ids
if @count>0
begin
update fruit set numbers=@numbers+numbers where ids=@ids
return 2
end
else
begin
insert into fruit values (@ids,@name,@price,@source,@stack,@numbers,@image)
return 1
end
end
--出货
else
begin
declare @shuliang int
select @shuliang=numbers from fruit where ids=@ids
if @shuliang>@numbers
begin
update fruit set numbers=@numbers+numbers where ids=@ids
return 1
end
else
begin
return -2
end
end
go
select *from fruit
--
declare @fanhui int
exec @fanhui = shuiguo 'k008','香梨',5.1,'库尔勒',4,-10,'image/7.gif'
if @fanhui=-2
begin
print '不够出货'
end