declare @table table(id int identity,userid int ,username nvarchar(50),logintime nvarchar(50))insert into @table select userid,username,logintime from userinformation
set @sql='select top'+str(@pagesize)+'userid,username from @table where logintime<(select min(logintime) from (select top'+str((@pageindex-1)*@pagesize)+'logintime from @table where headphoto2=''../image/headphoto2.bmp''
order by logintime desc)as t) where headphoto2=''../image/headphoto2.bmp'' order by logintime desc'exec(@sql)就是这样的情况,怎么说@table还要声明呢,为什么,明明上面声明了!求助啊?????
上面的就是个例子.请问@table 这里应该怎么写,这样错了吗???
set @sql='select top'+str(@pagesize)+'userid,username from @table where logintime<(select min(logintime) from (select top'+str((@pageindex-1)*@pagesize)+'logintime from @table where headphoto2=''../image/headphoto2.bmp''
order by logintime desc)as t) where headphoto2=''../image/headphoto2.bmp'' order by logintime desc'exec(@sql)就是这样的情况,怎么说@table还要声明呢,为什么,明明上面声明了!求助啊?????
上面的就是个例子.请问@table 这里应该怎么写,这样错了吗???
-------------------------------------------------------------------
insert into #tmp select userid,username,logintime from userinformation set @sql='select top'+str(@pagesize)+'userid,username from #tmp where logintime <(select min(logintime) from (select top'+str((@pageindex-1)*@pagesize)+'logintime from #tmp where headphoto2=''../image/headphoto2.bmp''
order by logintime desc)as t) where headphoto2=''../image/headphoto2.bmp'' order by logintime desc'exec(@sql)
[Id] [int] IDENTITY(1,1) NOT NULL,
[username ] [varchar](50) COLLATE Chinese_PRC_CI_AS NULL,
[logintime ] [varchar](50) COLLATE Chinese_PRC_CI_AS NULL,
CONSTRAINT [PK_SizePrice] PRIMARY KEY CLUSTERED
(
[Id] ASC
)WITH (IGNORE_DUP_KEY = OFF) ON [PRIMARY]
) ON [PRIMARY]
CREATE proc up_GetTopicList --分页程序
@a_TableList Varchar(1000),
@a_TableName Varchar(30),
@a_SelectWhere Varchar(500),
@a_SelectOrderId Varchar(20),
@a_SelectOrder Varchar(50),
@a_intPageNo int,
@a_intPageSize int,
@RecordCount int OUTPUT
as
/*定义局部变量*/
declare @intBeginID int
declare @intEndID int
declare @intRootRecordCount int
declare @intRowCount int
declare @TmpSelect NVarchar(600)
/*关闭计数*/
set nocount on
/*求总共根贴数*/ select @TmpSelect = 'set nocount on;select @SPintRootRecordCount = count(*) from '+@a_TableName+' '+@a_SelectWhere
execute sp_executesql
@TmpSelect,
N'@SPintRootRecordCount int OUTPUT',
@SPintRootRecordCount=@intRootRecordCount OUTPUTselect @RecordCount = @intRootRecordCount if (@intRootRecordCount = 0) --如果没有贴子,则返回零
return 0
/*判断页数是否正确*/
if (@a_intPageNo - 1) * @a_intPageSize > @intRootRecordCount
return (-1) /*求开始rootID*/
set @intRowCount = (@a_intPageNo - 1) * @a_intPageSize + 1
/*限制条数*/ select @TmpSelect = 'set nocount on;set rowcount @SPintRowCount;select @SPintBeginID = '+@a_SelectOrderId+' from '+@a_TableName+' '+@a_SelectWhere+' '+@a_SelectOrder
execute sp_executesql
@TmpSelect,
N'@SPintRowCount int,@SPintBeginID int OUTPUT',
@SPintRowCount=@intRowCount,@SPintBeginID=@intBeginID OUTPUT
/*结束rootID*/
set @intRowCount = @a_intPageNo * @a_intPageSize
/*限制条数*/ select @TmpSelect = 'set nocount on;set rowcount @SPintRowCount;select @SPintEndID = '+@a_SelectOrderId+' from '+@a_TableName+' '+@a_SelectWhere+' '+@a_SelectOrder
execute sp_executesql
@TmpSelect,
N'@SPintRowCount int,@SPintEndID int OUTPUT',
@SPintRowCount=@intRowCount,@SPintEndID=@intEndID OUTPUT
if @a_SelectWhere='' or @a_SelectWhere IS NULL
select @TmpSelect = 'set nocount off;set rowcount 0;select '+@a_TableList+' from '+@a_TableName+' where '+@a_SelectOrderId+' between '
else
select @TmpSelect = 'set nocount off;set rowcount 0;select '+@a_TableList+' from '+@a_TableName+' '+@a_SelectWhere+' and '+@a_SelectOrderId+' between 'if @intEndID > @intBeginID
select @TmpSelect = @TmpSelect+'@SPintBeginID and @SPintEndID'+' '+@a_SelectOrder
else
select @TmpSelect = @TmpSelect+'@SPintEndID and @SPintBeginID'+' '+@a_SelectOrder execute sp_executesql
@TmpSelect,
N'@SPintEndID int,@SPintBeginID int',
@SPintEndID=@intEndID,@SPintBeginID=@intBeginID return(@@rowcount)
--select @@rowcount
GO
程序看下面
http://topic.csdn.net/u/20081224/21/24a00c1d-bd71-4588-b5a8-93b5bed7767f.html1.“俄罗斯存储过程”的改良版CREATE procedure pagination1
(@pagesize int, --页面大小,如每页存储20条记录
@pageindex int --当前页码)
as set nocount onbegindeclare @indextable table(id int identity(1,1),nid int) --定义表变量
declare @PageLowerBound int --定义此页的底码
declare @PageUpperBound int --定义此页的顶码set @PageLowerBound=(@pageindex-1)*@pagesize
set @PageUpperBound=@PageLowerBound+@pagesize
set rowcount @PageUpperBound
insert into @indextable(nid) select gid from TGongwen where fariqi >dateadd(day,-365,getdate()) order by fariqi desc
select O.gid,O.mid,O.title,O.fadanwei,O.fariqi from TGongwen O,@indextable t where O.gid=t.nid
and t.id>@PageLowerBound and t.id <=@PageUpperBound order by t.idendset nocount off文章中的点评:以上存储过程运用了SQL SERVER的最新技术――表变量。应该说这个存储过程也是一个非常优秀的分页存储过程。当然,在这个过程中,您也可以把其中的表变量写成临时表:CREATE TABLE #Temp。但很明显,在SQL SERVER中,用临时表是没有用表变量快的。所以笔者刚开始使用这个存储过程时,感觉非常的不错,速度也比原来的ADO的好。但后来,我又发现了比此方法更好的方法。从感觉上讲,效率不是太高。
2. not in 的方法:
从publish 表中取出第 n 条到第 m 条的记录:SELECT TOP m-n+1 * FROM publish WHERE (id NOT IN (SELECT TOP n-1 id FROM publish))id 为publish 表的关键字文章中的点评:我当时看到这篇文章的时候,真的是精神为之一振,觉得思路非常得好。等到后来,我在作办公自动化系统(ASP.NET+ C#+SQL SERVER)的时候,忽然想起了这篇文章,我想如果把这个语句改造一下,这就可能是一个非常好的分页存储过程于是我就满网上找这篇文章,没想到,文章还没找到,却找到了一篇根据此语句写的一个分页存储过程,这个存储过程也是目前较为流行的一种分页存储过程。使用了 not in 而 not in 是无法使用索引的,所以从效率上讲还是差了一点。
3. max 的方法:select top 页大小 * from table1 where id>
(select max (id) from
(select top ((页码-1)*页大小) id from table1 order by id) as T)
order by id文章中的点评:我们知道,几乎任何字段,我们都可以通过max(字段)或min(字段)来提取某个字段中的最大或最小值,所以如果这个字段不重复,那么就可以利用这些不重复的字段的max或min作为分水岭,使其成为分页算法中分开每页的参照物。在这里,我们可以用操作符“>”或“ <”号来完成这个使命,使查询语句符合SARG形式。如:
Select top 10 * from table1 where id>200这个就高高效了一点。但是不清楚 max的工作原理,不知道它的性能如何。心得:1、追求高效的翻页算法 —— 定位法。declare @pageSize int --返回一页的记录数
declare @CurPage int --页号(第几页)0:第一页;-1最后一页。declare @Count int
declare @id intset @pageSize=10
set @CurPage =1--定位
if @CurPage = -1
begin
--最后一页
set rowcount @pageSize
select @id=newsID from newsTemp order by newsID
endif @CurPage > 0
begin
set @Count = @pageSize * (@CurPage -1) + 1
set rowcount @Count
select @id=newsID from newsTemp order by newsID desc
end--返回记录
set rowcount @pageSize
select * from newsTemp where newsID <=@id order by newsID descset rowcount 0
思路:就是上面的算法的延续,就是说呢避免使用 not in 和 max 的方法。也就是这个思路:Select top 10 * from table1 where id>200,定位 —— 就是说要找到“临界点”,分页的临界点。找到了之后剩下的事情就好办了。缺点:单字段排序、排序字段的值不能重复(不是绝对不能重复,可以有少量的重复)。
2、通用法 —— 颠颠倒倒法有的时候“定位法”的缺点是不可以接受的,但是没有关系,可以用这个的。select * from table where id in
(
select top 10 ID from
(
select top 20 ID,addedDate from table
order by addedDate desc
) as aa order by addedDate
)
order by addedDate descID 是主键,addedDate 是排序字段。缺点:必须有主键。
{
public int intPageNo = 1, intPageSize, intPageCount;
private string sql1, sql;
DBAccess db = new DBAccess();
DataSet ds = new DataSet();
private readonly string SqlConnString = ConfigurationManager.AppSettings["Conn"].ToString();
protected void Page_Load(object sender, EventArgs e)
{
if (Session["intpage"] != null)
{
intPageNo = Convert.ToInt32(Session["intpage"]);
}
if (!IsPostBack)
{
Session["intpage"] = 1;
}
}
void Getdata()
{
string str_chb1 = "";
for (int i = 0; i < chb1.Items.Count; i++)
{
if (chb1.Items[i].Selected)
{
str_chb1 += "," + chb1.Items[i].Value.ToString();
str_chb1 += " as ";
str_chb1 += chb1.Items[i].Text.ToString();
}
} //--------------------分页程序---------------------------
intPageSize = 20;
intPageNo = intPageNo;
sql1 = " bi_boxnum '箱件编号',jz '机组',bi_sbmc '设备名称', ";
sql1 += " ,(select count(*) from eq_boxdetail where bdt_xjbh=eq_boxinfo.bi_boxnum ) as '装箱数量' ";
sql = " where bi_pnum='" + Session["xmmc"].ToString() + "'"; SqlConnection mySqlConnection = new SqlConnection(SqlConnString);
SqlCommand mySqlCommand = new SqlCommand("up_GetTopicList", mySqlConnection);
mySqlCommand.CommandType = CommandType.StoredProcedure; SqlParameter workParm; //搜索表字段,以","号分隔
workParm = mySqlCommand.Parameters.Add("@a_TableList", SqlDbType.VarChar, 1000);
mySqlCommand.Parameters["@a_TableList"].Value = sql1; //搜索表名
workParm = mySqlCommand.Parameters.Add("@a_TableName", SqlDbType.VarChar, 30);
mySqlCommand.Parameters["@a_TableName"].Value = "Eq_boxinfo"; //Eq_boxinfo是表面 //搜索条件,如"select * from aa where a=1 and b=2 and c=3"则条件为"where a=1 and b=2 and c=3"
workParm = mySqlCommand.Parameters.Add("@a_SelectWhere", SqlDbType.VarChar, 500);
mySqlCommand.Parameters["@a_SelectWhere"].Value = sql; //表主键字段名,必须为INT类型
workParm = mySqlCommand.Parameters.Add("@a_SelectOrderId", SqlDbType.VarChar, 50);
mySqlCommand.Parameters["@a_SelectOrderId"].Value = " id"; //关键字 //排序,可以使用多字段排序但主键字段必需在最前面
workParm = mySqlCommand.Parameters.Add("@a_SelectOrder", SqlDbType.VarChar, 50);
mySqlCommand.Parameters["@a_SelectOrder"].Value = " order by id"; //排序 //页号
workParm = mySqlCommand.Parameters.Add("@a_intPageNo", SqlDbType.Int);
mySqlCommand.Parameters["@a_intPageNo"].Value = intPageNo; //每页显示数
workParm = mySqlCommand.Parameters.Add("@a_intPageSize", SqlDbType.Int);
mySqlCommand.Parameters["@a_intPageSize"].Value = intPageSize; //总记录数(存储过程输出参数)
workParm = mySqlCommand.Parameters.Add("@RecordCount", SqlDbType.Int);
workParm.Direction = ParameterDirection.Output; //当前页记录数(存储过程返回值)
workParm = mySqlCommand.Parameters.Add("RowCount", SqlDbType.Int);
workParm.Direction = ParameterDirection.ReturnValue; mySqlConnection.Open();
SqlDataReader sdr = mySqlCommand.ExecuteReader();
if (sdr != null && sdr.HasRows)
{ UltraWebGrid1.DataSource = sdr;
UltraWebGrid1.DataBind();
}
else
{
Response.Write("<script>window.alert('没有查询到相关内容!将返回到上一个页面!');window.history.go(-1);</script>");
} mySqlConnection.Close(); Int32 RecordCount = (Int32)mySqlCommand.Parameters["@RecordCount"].Value;
Int32 RowCount = (Int32)mySqlCommand.Parameters["RowCount"].Value; LabelRecord.Text = RecordCount.ToString();
LabelRow.Text = intPageNo.ToString();
intPageCount = RecordCount / intPageSize;
//-------------------判断如果只要一页,分页按钮失效-------------------
if (intPageCount == 1)
{
LinkButton2.Enabled = true;
LinkButton3.Enabled = true;
LinkButton1.Enabled = false;
LinkButton4.Enabled = false;
}
//---------------------------------------------------------------
if ((RecordCount % intPageSize) > 0)
intPageCount += 1;
LabelPage.Text = intPageCount.ToString(); } //------------------首页代码---------------------------------
protected void LinkButton3_Click(object sender, EventArgs e)
{
intPageNo = 1;
Session["intpage"] = intPageNo;
Getdata();
LinkButton2.Enabled = false;
LinkButton3.Enabled = false;
LinkButton1.Enabled = true;
LinkButton4.Enabled = true;
}
//-----------------上一页代码------------------------------
protected void LinkButton2_Click(object sender, EventArgs e)
{
if (Convert.ToInt32(Session["intpage"]) != 1)
{
intPageNo = Convert.ToInt32(Session["intpage"]) - 1;
Session["intpage"] = intPageNo;
Getdata();
LinkButton2.Enabled = true;
LinkButton3.Enabled = true;
LinkButton1.Enabled = true;
LinkButton4.Enabled = true;
}
else
{
intPageNo = 1;
Session["intpage"] = intPageNo;
Getdata();
LinkButton2.Enabled = false;
LinkButton3.Enabled = false;
LinkButton1.Enabled = true;
LinkButton4.Enabled = true;
}
} //------------------下一页代码--------------------------
protected void LinkButton1_Click(object sender, EventArgs e)
{
if (Convert.ToInt32(Session["intpage"]) != Convert.ToInt32(LabelPage.Text))
{
intPageNo = Convert.ToInt32(Session["intpage"]) + 1;
Session["intpage"] = intPageNo;
Getdata();
if (intPageNo == Convert.ToInt32(LabelPage.Text))
{
LinkButton2.Enabled = true;
LinkButton3.Enabled = true;
LinkButton1.Enabled = false;
LinkButton4.Enabled = false;
}
else
{
LinkButton2.Enabled = true;
LinkButton3.Enabled = true;
LinkButton1.Enabled = true;
LinkButton4.Enabled = true;
}
}
else
{
intPageNo = Convert.ToInt32(LabelPage.Text.ToString());
Session["intpage"] = intPageNo;
Getdata();
LinkButton2.Enabled = true;
LinkButton3.Enabled = true;
LinkButton1.Enabled = false;
LinkButton4.Enabled = false;
}
} //--------------------------------尾页代码-----------------------------
protected void LinkButton4_Click(object sender, EventArgs e)
{
intPageNo = Convert.ToInt32(LabelPage.Text.ToString());
Session["intpage"] = intPageNo;
Getdata();
LinkButton2.Enabled = true;
LinkButton3.Enabled = true;
LinkButton1.Enabled = false;
LinkButton4.Enabled = false;
} protected void Button1_Click(object sender, EventArgs e)
{
intPageNo =Convert.ToInt32( TextBox1.Text.Trim());
Session["intpage"] = TextBox1.Text.Trim();
Getdata();
}
set @sql='declare @table table(id int identity,userid int ,username nvarchar(50),logintime nvarchar(50)) insert into @table select userid,username,logintime from userinformation'
+ 'select top'+str(@pagesize)+'userid,username from @table where logintime <(select min(logintime) from (select top'+str((@pageindex-1)*@pagesize)+'logintime from @table where headphoto2=''../image/headphoto2.bmp''
order by logintime desc)as t) where headphoto2=''../image/headphoto2.bmp'' order by logintime desc'
exec(@sql)