统计testa表中的各个下级分类的数量（利用游标）

创建表：

USE [testa]
GO

/****** Object:  Table [dbo].[AjaxCity]    Script Date: 06/26/2011 14:05:36 ******/
SET ANSI_NULLS ON
GO

SET QUOTED_IDENTIFIER ON
GO

CREATE TABLE [dbo].[AjaxCity](
 [id] [int] NOT NULL,
 [cityName] [nvarchar](50) NOT NULL,
 [short] [nvarchar](10) NOT NULL
) ON [PRIMARY]

GO

USE [testa]
GO

/****** Object:  Table [dbo].[AjaxCounty]    Script Date: 06/26/2011 14:06:23 ******/
SET ANSI_NULLS ON
GO

SET QUOTED_IDENTIFIER ON
GO

CREATE TABLE [dbo].[AjaxCounty](
 [id] [int] NOT NULL,
 [countryName] [nvarchar](50) NOT NULL,
 [cityID] [int] NOT NULL
) ON [PRIMARY]

GO

 

CREATE PROCEDURE mysp_Cursor
    @Result varchar(255) output/*声明输出变量*/
AS
    declare city_cursor cursor for/*声明游标变量*/
    select [ID] from AjaxCity

set @Result=''
declare @Field int/*声明临时存放CityID的变量*/
open city_cursor /*打开游标*/
fetch next from city_cursor into @Field/*将实际ID赋给变量*/
while(@@fetch_status=0)/*循环开始*/
begin
       if @Result = ''
           select @Result = convert(nvarchar(2),count(*))  from AjaxCounty where CityID=@Field
       else
           select @Result = @Result + ',' + convert(nvarchar(2),count(*)) from AjaxCounty where CityID=@Field
      
       fetch next from city_cursor into @Field/*下一个CityID*/
       print @Result
end
close city_cursor/*关闭游标*/
deallocate city_cursor/*释放游标引用*/
GO

declare @Result varchar(255)
exec mysp_Cursor @Result
print @Result