DECLARE cursor_name CURSOR [ LOCAL | GLOBAL ]   [ FORWARD_ONLY | SCROLL ]   [ STATIC | KEYSET | DYNAMIC | FAST_FORWARD ]   [ READ_ONLY | SCROLL_LOCKS | OPTIMISTIC ]   [ TYPE_WARNING ]   FOR select_statement   [ FOR UPDATE [ OF column_name [ ,...n ] ] ]
[;]  

-- 定义一个局部动态游标
declare test_cursor cursor local
scroll dynamic optimistic
for select S_Id,S_StuNo,S_Name,S_Sex,S_Height from Student where C_S_Id='2'

-- 打开游标语法
open [ Global ] cursor_name | cursor_variable_name

-- 打开游标
open test_cursor-- 打开局部游标
open local test_cursor-- 打开全局游标
open global test_cursor

-- 游标提取数据语法
FETCH   [ [ NEXT | PRIOR | FIRST | LAST   | ABSOLUTE { n | @nvar }   | RELATIVE { n | @nvar }   ]   FROM   ]
{ { [ GLOBAL ] cursor_name } | @cursor_variable_name }
[ INTO @variable_name [ ,...n ] ]  

fetch first from test_cursor into @Name
select @Name
fetch prior from test_cursor into @Name
select @Name
fetch next from test_cursor into @Name
select @Name
fetch last from test_cursor into @Name
select @Name
fetch absolute 1 from test_cursor into @Name
select @Name
fetch relative 1 from test_cursor into @Name
select @Name

--使用游标修改当前数据语法
update 基表名 Set 列名=值[,...] where current of 游标名update Student set S_Name='233' where current of test_cursor--使用游标删除当前数据语法
delete 基表名  where current of 游标名delete Student where current of test_cursor

--关闭游标语法
close [ Global ] cursor_name | cursor_variable_name

--关闭游标
close test_cursor--关闭局部游标
close local test_cursor--关闭全局游标
close global test_cursor

--释放游标语法
deallocate  [ Global ] cursor_name | cursor_variable_name

--释放游标
deallocate test_cursor--释放局部游标
deallocate local test_cursor--释放全局游标
deallocate global test_cursor

declare @StuNo nvarchar(50)
declare test_cursor cursor local
for select S_StuNo from Student
open test_cursor
fetch next from test_cursor into @StuNo
while(@@FETCH_STATUS=0)
beginset @StuNo='1'+@StuNoif(@StuNo is not null and @StuNo <> '')beginupdate Student set S_StuNo=@StuNo where current of test_cursorendfetch next from test_cursor into @StuNo
end
close test_cursor
deallocate test_cursorselect * from Student

declare @I    int
declare @Num int
declare @SID int
declare @StuNo nvarchar(50)select @Num=COUNT(1) from Studentif(@Num>0)
beginset @I=0while(@I<@Num)beginset @I=@I+1select @StuNo=t.S_StuNo,@SID=t.S_Id from (select S_Id,S_StuNo,ROW_NUMBER() over(order by S_StuNo) RowNum from Student) twhere t.RowNum=@Iset @StuNo=SUBSTRING(@StuNo,2,len(@StuNo)-1)update Student set S_StuNo=@StuNo where S_Id=@SIDend
endselect * from Student

  declare @NodeId intdeclare @NID intset @NodeId=1        -- 表示选择节点的IDdeclare @temp_value table(ID int identity(1,1),value int)insert into @temp_value select D_ID from Department where D_ID=@NodeIddeclare one_curr cursor local scroll dynamic        --定义一个局部的动态游标for select value from @temp_valueopen one_currfetch next from one_curr into @NIDwhile(@@FETCH_STATUS=0)beginif exists(select D_ID from Department where D_ParentID=@NID)    --判断是否存在子节点begininsert into @temp_value select D_ID from Department where D_ParentID=@NID        --存在就把所有的子节点的ID插入表变量，后面循环使用enddelete from Department where D_ID=@NID        --删除相应的节点fetch next from one_curr into @NIDendclose one_currdeallocate one_currselect * from Department