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
如有问题：可以回帖
Feedback