/*--用存储过程实现的分页程序
显示指定表、视图、查询结果的第X页
对于表中主键或标识列的情况,直接从原表取数查询，其它情况使用临时表的方法
如果视图或查询结果中有主键,不推荐此方法
--邹建 2003.09--*/
/*--调用示例
exec p_show ‘地区资料‘
exec p_show ‘地区资料‘,5,3,‘地区编号,地区名称,助记码‘,‘地区编号‘
--*/
/*
因为要顾及通用性,所以对带排序的查询语句有一定要求.如果先排序,再出结果.就是:
exec p_show ‘select top 100 percent * from 地区资料 order by 地区名称‘,5,3,‘地区编号,地区名称,助记码‘,‘地区名称‘
--查询语句加上:top 100 percent //top时
*/
if exists (select * from dbo.sysobjects where id = object_id(N‘[dbo].[p_show]‘) and OBJECTPROPERTY(id, N‘IsProcedure‘) = 1)
drop procedure [dbo].[p_show]
GO
CREATE Proc p_show
@QueryStr nvarchar(4000), --表名、视图名、查询语句
@PageSize int=10, --每页的大小(行数)
@PageCurrent int=1, --要显示的页
@FdShow nvarchar (4000)=‘‘, --要显示的字段列表,如果查询结果有标识字段,需要指定此值,且不包含标识字段
@FdOrder nvarchar (1000)=‘‘ --排序字段列表
as
declare @FdName nvarchar(250) --表中的主键或表、临时表中的标识列名
,@Id1 varchar(20),@Id2 varchar(20) --开始和结束的记录号
,@Obj_ID int --对象ID
--表中有复合主键的处理
declare @strfd nvarchar(2000) --复合主键列表
,@strjoin nvarchar(4000) --连接字段
,@strwhere nvarchar(2000) --查询条件
select @Obj_ID=object_id(@QueryStr)
,@FdShow=case isnull(@FdShow,‘‘) when ‘‘ then ‘ *‘ else ‘ ‘+@FdShow end
,@FdOrder=case isnull(@FdOrder,‘‘) when ‘‘ then ‘‘ else ‘ order by ‘+@FdOrder end
,@QueryStr=case when @Obj_ID is not null then ‘ ‘+@QueryStr else ‘ (‘+@QueryStr+‘) a‘ end
--如果显示第一页，可以直接用top来完成
if @PageCurrent=1
begin
select @Id1=cast(@PageSize as varchar(20))
exec(‘select top ‘+@Id1+@FdShow+‘ from ‘+@QueryStr+@FdOrder)
return
end
--如果是表,则检查表中是否有标识更或主键
if @Obj_ID is not null and objectproperty(@Obj_ID,‘IsTable‘)=1
begin
select @Id1=cast(@PageSize as varchar(20))
,@Id2=cast((@PageCurrent-1)*@PageSize as varchar(20))
select @FdName=name from syscolumns where id=@Obj_ID and status=0x80
if @@rowcount=0 --如果表中无标识列,则检查表中是否有主键
begin
if not exists(select 1 from sysobjects where parent_obj=@Obj_ID and xtype=‘PK‘)
goto lbusetemp --如果表中无主键,则用临时表处理
select @FdName=name from syscolumns where id=@Obj_ID and colid in(
select colid from sysindexkeys where @Obj_ID=id and indid in(
select indid from sysindexes where @Obj_ID=id and name in(
select name from sysobjects where xtype=‘PK‘ and parent_obj=@Obj_ID
)))
if @@rowcount>1 --检查表中的主键是否为复合主键
begin
select @strfd=‘‘,@strjoin=‘‘,@strwhere=‘‘
select @strfd=@strfd+‘,[‘+name+‘]‘
,@strjoin=@strjoin+‘ and a.[‘+name+‘]=b.[‘+name+‘]‘
,@strwhere=@strwhere+‘ and b.[‘+name+‘] is null‘
from syscolumns where id=@Obj_ID and colid in(
select colid from sysindexkeys where @Obj_ID=id and indid in(
select indid from sysindexes where @Obj_ID=id and name in(
select name from sysobjects where xtype=‘PK‘ and parent_obj=@Obj_ID
)))
select @strfd=substring(@strfd,2,2000)
,@strjoin=substring(@strjoin,5,4000)
,@strwhere=substring(@strwhere,5,4000)
goto lbusepk
end
end
end
else
goto lbusetemp
/*--使用标识列或主键为单一字段的处理方法--*/
lbuseidentity:
exec(‘select top ‘+@Id1+@FdShow+‘ from ‘+@QueryStr
+‘ where ‘+@FdName+‘ not in(select top ‘
+@Id2+‘ ‘+@FdName+‘ from ‘+@QueryStr+@FdOrder
+‘)‘+@FdOrder
)
return
/*--表中有复合主键的处理方法--*/
lbusepk:
exec(‘select ‘+@FdShow+‘ from(select top ‘+@Id1+‘ a.* from
(select top 100 percent * from ‘+@QueryStr+@FdOrder+‘) a
left join (select top ‘+@Id2+‘ ‘+@strfd+‘
from ‘+@QueryStr+@FdOrder+‘) b on ‘+@strjoin+‘
where ‘+@strwhere+‘) a‘
)
return
/*--用临时表处理的方法--*/
lbusetemp:
select @FdName=‘[ID_‘+cast(newid() as varchar(40))+‘]‘
,@Id1=cast(@PageSize*(@PageCurrent-1) as varchar(20))
,@Id2=cast(@PageSize*@PageCurrent-1 as varchar(20))
exec(‘select ‘+@FdName+‘=identity(int,0,1),‘+@FdShow+‘
into #tb from‘+@QueryStr+@FdOrder+‘
select ‘+@FdShow+‘ from #tb where ‘+@FdName+‘ between ‘
+@Id1+‘ and ‘+@Id2
)
Sqlserver存储过程和C#分页类简化你的代码!
在最近的项目中，由于要用到自定义分页的功能，本人就在网上找了个存储过程。结合C#写了个分页类。由于本人第一次写文章。写得不好，大家不要扔鸡蛋。。
下面是存储过程（sqlserver2000下通过)
--最通用的分页存储过程
-- 获取指定页的数据
CREATE PROCEDURE Pagination
@tblName varchar(255), -- 表名
@strGetFields varchar(1000) = ‘*‘, -- 需要返回的列
@fldName varchar(255)=‘‘, -- 排序的字段名
@PageSize int = 10, -- 页尺寸
@PageIndex int = 1, -- 页码
@doCount bit = 0, -- 返回记录总数, 非 0 值则返回
@OrderType bit = 0, -- 设置排序类型, 非 0 值则降序
@strWhere varchar(1500) = ‘‘ -- 查询条件 (注意: 不要加 where)
AS
declare @strSQL varchar(5000) -- 主语句
declare @strTmp varchar(110) -- 临时变量
declare @strOrder varchar(400) -- 排序类型
if @doCount != 0
begin
if @strWhere !=‘‘
set @strSQL = ‘select count(*) as Total from [‘+ @tblName +‘] where ‘+ @strWhere
else
set @strSQL = ‘select count(*) as Total from [‘+ @tblName +‘]‘
end
--以上代码的意思是如果@doCount传递过来的不是0，就执行总数统计。以下的所有代码都
--是@doCount为0的情况
else
begin
if @OrderType != 0
begin
set @strTmp = ‘<(select min‘
set @strOrder = ‘ order by [‘+ @fldName +‘] desc‘
--如果@OrderType不是0，就执行降序，这句很重要！
end
else
begin
set @strTmp = ‘>(select max‘
set @strOrder = ‘ order by [‘+ @fldName +‘] asc‘
end
if @PageIndex = 1
begin
if @strWhere != ‘‘
set @strSQL = ‘select top ‘ + str(@PageSize) +‘ ‘+@strGetFields+ ‘ from [‘+ @tblName +‘] where ‘ + @strWhere + ‘ ‘ + @strOrder
else
set @strSQL = ‘select top ‘ + str(@PageSize) +‘ ‘+@strGetFields+ ‘ from [‘+ @tblName +‘] ‘+ @strOrder
--如果是第一页就执行以上代码，这样会加快执行速度
end
else
begin
--以下代码赋予了@strSQL以真正执行的SQL代码
set @strSQL = ‘select top ‘ + str(@PageSize) +‘ ‘+@strGetFields+ ‘ from [‘ + @tblName +‘] where [‘ + @fldName + ‘]‘ + @strTmp + ‘([‘+ @fldName + ‘])
from (select top ‘ + str((@PageIndex-1)*@PageSize) + ‘ [‘+ @fldName + ‘] from [‘+ @tblName +‘]‘ + @strOrder + ‘) as tblTmp)‘+ @strOrder
if @strWhere != ‘‘
set @strSQL = ‘select top ‘ + str(@PageSize) +‘ ‘+@strGetFields+ ‘ from [‘+ @tblName +‘] where [‘ + @fldName + ‘]‘ + @strTmp + ‘([‘+ @fldName + ‘]) from (select top ‘ + str((@PageIndex-1)*@PageSize) + ‘ [‘+ @fldName + ‘]
from [‘+ @tblName +‘] where ‘ + @strWhere + ‘ ‘ + @strOrder + ‘) as tblTmp) and ‘ + @strWhere + ‘ ‘ + @strOrder
end
end
exec ( @strSQL)
GO
下面是C#的代码
using System.Data ;
using System.Data.SqlClient ;
using Microsoft.ApplicationBlocks.Data ;
using System.Web ;
using System.Web.UI ;
namespace RssLayer.PageHelper
{
/**//// <summary>
/// 分页类PagerHelper 的摘要说明。
/// </summary>
public class PagerHelper
{
private string connectionString;
public PagerHelper(string tblname,string sortname,bool docount,string connectionString)
{
this.tblName = tblname;
this.fldName = sortname ;
this.connectionString = connectionString ;
this.docount = docount;
}
public PagerHelper(string tblname,bool docount,
string strGetFields, string fldName,int pagesize,
int pageindex,bool ordertype,string strwhere,string connectionString
)
{
this.tblName = tblname ;
this.docount = docount ;
this.strGetFields = strGetFields ;
this.fldName = fldName;
this.pagesize = pagesize ;
this.pageindex = pageindex;
this.ordertype = ordertype ;
this.strwhere = strwhere ;
this.connectionString = connectionString ;
}
/**//// <summary>
/// 得到记录集的构造函数
/// </summary>
/// <param name="tblname"></param>
/// <param name="strwhere"></param>
/// <param name="connectionString"></param>
public PagerHelper(string tblname,string strwhere,string connectionString)
{
this.tblName = tblname;
this.strwhere = strwhere ;
this.docount = true;
this.connectionString = connectionString ;
}
private string tblName;
public string TblName
{
get{return tblName;}
set{tblName =value;}
}
private string strGetFields="*";
public string StrGetFields
{
get{return strGetFields ;}
set{strGetFields =value;}
}
private string fldName=string.Empty;
public string FldName
{
get{return fldName ;}
set{fldName =value;}
}
private int pagesize =10;
public int PageSize
{
get{return pagesize ;}
set{pagesize =value;}
}
private int pageindex =1;
public int PageIndex
{
get{return pageindex ;}
set{pageindex =value;}
}
private bool docount=false;
public bool DoCount
{
get{return docount ;}
set{docount =value;}
}
private bool ordertype=false;
public bool OrderType
{
get{return ordertype ;}
set{ordertype =value;}
}
private string strwhere=string.Empty ;
public string StrWhere
{
get{return strwhere ;}
set{strwhere =value;}
}
public IDataReader GetDataReader()
{
if(this.docount)
{
throw new ArgumentException("要返回记录集，DoCount属性一定为false");
}
// System.Web.HttpContext.Current.Response.Write(pageindex);
return SqlHelper.ExecuteReader(connectionString,CommandType.StoredProcedure,"Pagination",
new SqlParameter("@tblName",this.tblName),
new SqlParameter("@strGetFields",this.strGetFields),
new SqlParameter("@fldName",this.fldName),
new SqlParameter("@PageSize",this.pagesize),
new SqlParameter("@PageIndex",this.pageindex),
new SqlParameter("@doCount",this.docount),
new SqlParameter("@OrderType",this.ordertype),
new SqlParameter("@strWhere",this.strwhere)
);
}
public DataSet GetDataSet()
{
if(this.docount)
{
throw new ArgumentException("要返回记录集，DoCount属性一定为false");
}
return SqlHelper.ExecuteDataset(connectionString,CommandType.StoredProcedure,"Pagination",
new SqlParameter("@tblName",this.tblName),
new SqlParameter("@strGetFields",this.strGetFields),
new SqlParameter("@fldName",this.fldName),
new SqlParameter("@PageSize",this.pagesize),
new SqlParameter("@PageIndex",this.pageindex),
new SqlParameter("@doCount",this.docount),
new SqlParameter("@OrderType",this.ordertype),
new SqlParameter("@strWhere",this.strwhere)
);
}
public int GetCount()
{
if(!this.docount)
{
throw new ArgumentException("要返回总数统计，DoCount属性一定为true");
}
return (int)SqlHelper.ExecuteScalar(connectionString,CommandType.StoredProcedure,"Pagination",
new SqlParameter("@tblName",this.tblName),
new SqlParameter("@strGetFields",this.strGetFields),
new SqlParameter("@fldName",this.fldName),
new SqlParameter("@PageSize",this.pagesize),
new SqlParameter("@PageIndex",this.pageindex),
new SqlParameter("@doCount",this.docount),
new SqlParameter("@OrderType",this.ordertype),
new SqlParameter("@strWhere",this.strwhere)
);
}
}
}
如何调用？？？
假如我已经建立了2个类。一个是FavList数据库实体类，一个FavListCollection集合类。FavListCollection存储了FavList实体类的集合。
我可以这样写一个方法。
/**//// <summary>
/// 返回FavList集合,使用存储过程自定义分页。
/// </summary>
/// <param name="userid">数据库FavList的字段，用户ID</param>
/// <param name="strwhere">查找的条件</param>
/// <param name="ordertype">排序，true表示Desc,false表示asc</param>
/// <param name="fldname">排序的字段，只能是一个字段</param>
/// <param name="pagesize">每页的记录数</param>
/// <param name="pageindex">到第几页的参数，由1开始。1表示第一页，以此类推。</param>
/// <param name="recordcount">总记录数。</param>
/// <returns></returns>
public override FavListCollection GetFavListsByUser(int userid, string strwhere,
bool ordertype, string fldname, int pagesize,
int pageindex,out int recordcount
)
{
recordcount = 0;
PagerHelper helper = new PagerHelper("Vfavlist",strwhere,ConnectionString); //VFavList是View
recordcount = helper.GetCount();
PagerHelper helper2 = new PagerHelper("Vfavlist",false," * ",fldname,
pagesize,pageindex,ordertype,strwhere,ConnectionString);
IDataReader dr = helper2.GetDataReader();
FavListCollection list = new FavListCollection();
while(dr.Read())
{
list.Add(PopulateFavList(dr));
}
dr.Close();
return list;
}
DataGrid调用就不用说了吧。。
关于该分页的Bug和局限性
Bug：当排序那个字段内容相同的时候（例如：按时间来排序，而时间是一样的话。后面的记录会显示不出来。本人测试过)
局限性：排序只能一个字段，不能超过一个
出处：BLOG永不言拜
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