SQL Serverカーソルの例

1934 ワード

-カーソルの宣言
declare my_cursor cursor keyset for select * from info
--カーソルリソースの削除
deallocate my_cursor
--カーソルを開きます.カーソルが閉じるか削除するまで有効です.
open my_cursor
--カーソルを閉じる
close my_cursor
--カーソルの解放
deallocate my_cursor
--ローカル変数の宣言
declare @id int,@name varchar(20),@address varchar(20)
--指定された場所に配置されたレコード
fetch absolute 56488 from my_cursor into @id,@name,@address
select @id as id,@name as name,@address as address
--現在のレコードの相対位置レコードにナビゲート
fetch relative -88 from my_cursor into @id,@name,@address
select @id as id,@name as name,@address as address
--現在のレコードの前に移動
fetch prior from my_cursor into @id,@name,@address
select @id as id,@name as name,@address as address
--現在のレコードの後に配置
fetch next from my_cursor into @id,@name,@address
select @id as id,@name as name,@address as address
--先頭レコードにナビゲート
fetch first from my_cursor into @id,@name,@address
select @id as id,@name as name,@address as address
--末尾レコードにナビゲート
fetch last from my_cursor into @id,@name,@address
select @id as id,@name as name,@address as address
例:
use database1
declare my_cursor cursor scroll dynamic

 /**//*scroll           (      ),dynamic        (      )*/

for

select productname from  product

open my_cursor

declare @pname sysname

fetch next from my_cursor into @pname

while(@@fetch_status=0)

  begin

    print 'Product Name: ' + @pname

    fetch next from my_cursor into @pname

  end

fetch first from my_cursor into @pname

print @pname

/**//*update product set productname='zzg' where current of my_cursor */

/**//*delete from product where current of my_cursor */

close my_cursor

deallocate my_cursor