MSSQL示例（四）定义服务器游标VS游标变量

-- =============================================

-- Author:  tomtom

-- Create date: 2015.2.28

-- Description:定义服务器游标VS游标变量

-- =============================================

----1.示例数据准备

create table t1

(

id int

)

go

create table t2

(

name int

)

go

insert into t1

select 1

insert into t2

select 21 union all

select 11

select * from t1

select * from t2

----2.1定义服务器游标DECLARE my_cur CURSOR

--定义时必须加FOR子句了，并且不能作为变量被赋值如set cur_t1 =

declare cur_t1 CURSOR FOR select * from t1

open cur_t1

declare @name1 int

fetch next from cur_t1 into @name1

select @name1

select @name1=-1

fetch next from cur_t1 into @name1 --没有行了，@name1还是上次的值

select @name1

close cur_t1

deallocate cur_t1

----2.2游标变量示例DECLARE @my_cur CURSOR

--重新设置后，不重新打开将提示“游标未打开。”

declare @cur_t2 CURSOR 

set @cur_t2 = CURSOR FOR select * from t2

open @cur_t2

declare @name int

fetch next from @cur_t2 into @name

select @name

--re set cursor

set @cur_t2 = CURSOR FOR select * from t1

open @cur_t2

fetch next from @cur_t2 into @name

select @name

close @cur_t2

deallocate @cur_t2