sqlserver存储过程/游标及实例 –系统存储过程 exec sp_databases –查看系统数据库 exec sp_tables –查看系统表 exec sp_rename ‘aaa’,’bbb’ –修改表明aaa为bbb exec sp_rename ‘dbo.aaa’,’col1′,’col2′ –修改表aaa的列col1为col2 select * from sys.objects where type=’P’ –查询存储过程 –存储过程(简单无参) use Task_Bogic go if(exists (select * from sys.objects where name=’proc_test’)) drop proc proc_test go create proc proc_test as select * from Task_Bogic.dbo.Tnfo where Status=7 go exec proc_test –存储过程(带参) if(OBJECT_ID(‘proc_paramTest’,’P’) is not null) drop proc proc_paramTest go create proc proc_paramTest(@status int,@hasItem bit) as select * from Task_Bogic.dbo.Tnfo where Status=@status and HasCheckitem=@hasItem go exec proc_paramTest 7,1; –存储过程(带参且带通配符[注意:nvarchar(20)这里的20如果没有加,则执行结果不正确,必须加一个长度]) –1.参数增加通配符 if(OBJECT_ID(‘proc_para_test’,’P’) is not null) drop proc proc_para_test go create proc proc_para_test(@status int,@title nvarchar(20)=’%a%’) as select * from Task_Bogic.dbo.Tnfo where Status=@status and Title like @title go exec proc_para_test 7,’%a%’ –2.拼接通配符 if(OBJECT_ID(‘proc_para_test’,’P’) is not null) drop proc proc_para_test go create proc proc_para_test(@status int,@title nvarchar) as select * from Task_Bogic.dbo.Tnfo where Status=@status and Title like ‘%’+@title+’%’ go exec proc_para_test 7,’a’ –带输出参数的存储过程 if(OBJECT_ID(‘proc_out_paraTest’,’P’) is not null) drop proc proc_out_paraTest go create proc proc_out_paraTest( @status int, @priority int out, @title nvarchar output ) as select @status=Status,@priority=Priority,@title=Title from Task_Bogic.dbo.Tnfo where Status=@status and Title like ‘%’+@title+’%’ go declare @status int, @priority nvarchar, @temp nvarchar; set @status=7; set @temp=’a’ exec proc_out_paraTest @status,@priority out,@temp output select @priority,@temp print @priority+’,’+@temp –不从缓存读取的存储过程(每次执行都重新编译执行) if(object_id(‘proc_para_test’,’P’) is not null) drop proc_para_test go create proc proc_para_test with recompile as select * from Task_Bogic.dbo.Tnfo where status=7 go exec proc_para_test; –加密存储过程 if(object_id(‘proc_para_test’,’P’) is not null) drop proc_para_test go create proc proc_para_test with encryption as select * from Task_Bogic.dbo.Tnfo where status=7 go exec proc_para_test –包含游标的存储过程(暂无) –if(object_id(‘proc_para_test’,’P’) is not null) – drop proc proc_para_test –go –create proc proc_para_test – @cursor cursor –as –分页存储过程 –row_number分页 if(object_id(‘proc_para_test’,’P’) is not null) drop proc proc_para_test go create proc proc_para_test @startIndex int, @endIndex int as select count(*) from Task_Bogic.dbo.Tnfo; select * from (select row_number() over(order by createTime) as rowId,* from Task_Bogic.dbo.Tnfo) Stu where Stu.rowId between @startIndex and @endIndex go exec proc_para_test 2,5 –根据传递的页码和每页显示数量分页 if(object_id(‘proc_para_test’,’P’) is not null) drop proc proc_para_test go create proc proc_para_test @pageIndex int, @pageSize int as declare @startRow int,@endRow int set @startRow=(@pageIndex-1)*@pageSize+1 set @endRow=@pageIndex*@pageSize select * from (select *,ROW_NUMBER() over(order by CreateTime) as Row_Id from Task_Bogic.dbo.Tnfo) item where item.Row_Id between @startRow and @endRow go exec proc_para_test 1,10 –存储过程实例 –斐波那契数列计算 if(OBJECT_ID(‘proc_test’,’P’) is not null) drop proc proc_test go create proc proc_test as declare @count int,@num1 int,@num2 int,@sum int set @count=1 set @sum=0 set @num1=1 set @num2=1 while @count<=10 begin set @sum=@num1+@num2; set @num1=@num2; set @num2=@sum; set @count+=1; end select @sum go exec proc_test –鸡兔同笼,头30,腿100 if(OBJECT_ID(‘proc_test’,’P’) is not null) drop proc proc_test go create proc proc_test as declare @num1 int,@num2 int set @num1=1 while @num1<=30 begin set @num2=30-@num1 if 100=@num1*4+@num2*2 begin print ‘兔:’+convert(nvarchar,@num1)+’只,鸡’+convert(nvarchar,@num2)+’只’ end set @num1+=1 end go exec proc_test –二一次方程组算法 if(OBJECT_ID(‘proc_test’,’P’) is not null) drop proc proc_test go create proc proc_test as go exec proc_test –set nocount on 不再返回行数【但是@@Rowcount仍会计算】,只会提示(命令已成功完成)set nocount off关闭不返回行数(即返回受影响行数) set nocount on select * from Tnfo where Status=7 set nocount off select * from Tnfo where Status=7 –set rowcount 5 设置返回行数(5代表5行),查询数据只能返回5行,和select top 5 一样。使用set rowcount 0,取消设置。 set rowcount 5 select * from Tnfo where Status=7 set rowcount 0 select * from Tnfo where Status=7 –@@rowcount返回行数,这里查询10行,则就是10,一般循环的时候使用,如果@@rowcount不大于0,则没有查询到数据。 select top 10 * from Tnfo select @@ROWCOUNT –游标 declare cur_task cursor for –定义游标 select * from [Task_Bogic].[dbo].[Tnfo] where status=7 and title like ‘%a%’ open cur_task –打开游标 fetch next from cur_task –第一条数据 while @@fetch_status=0 –如果存在数据 begin fetch next from cur_task –查询下一条 end close cur_task –关闭游标 deallocate cur_task –释放游标 go –游标使用 select id,createTime from [Task_Bogic].[dbo].[Tnfo] where status=7 and title like ‘%a%’ declare @id uniqueidentifier,@cur_createTime datetime,@num int set @num=-1 declare cur_task cursor for –定义游标 select id,createTime from [Task_Bogic].[dbo].[Tnfo] where status=7 and title like ‘%a%’ open cur_task –打开游标 fetch next from cur_task into @id,@cur_createTime –第一条数据 while @@fetch_status=0 –如果存在数据 begin print convert(nvarchar(100),@id)+’—–‘+convert(nvarchar(100),@cur_createTime,120) update [Task_Bogic].[dbo].[Tnfo] set CreateTime=DATEADD(DAY,@num,GETDATE()) where Id=@id fetch next from cur_task into @id,@cur_createTime –查询下一条 set @num-=1 end close cur_task –关闭游标 deallocate cur_task –释放游标 go
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