2分法-通用存儲(chǔ)過程分頁(top max模式)版本

2024-07-21 02:31:32

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--/*-----存儲(chǔ)過程分頁處理孫偉 2005-03-28創(chuàng)建 -------*/
--/*----- 對數(shù)據(jù)進(jìn)行了2分處理使查詢前半部分?jǐn)?shù)據(jù)與查詢后半部分?jǐn)?shù)據(jù)性能相同 -------*/
--/*-----存儲(chǔ)過程分頁處理孫偉 2005-04-21修改添加Distinct查詢功能-------*/
--/*-----存儲(chǔ)過程分頁處理孫偉 2005-05-18修改多字段排序規(guī)則問題-------*/
--/*-----存儲(chǔ)過程分頁處理孫偉 2005-06-15修改多字段排序修改-------*/
--/*-----存儲(chǔ)過程分頁處理孫偉 2005-12-13修改修改數(shù)據(jù)分頁方式為top max模式性能有極大提高-------*/
--/*-----缺點(diǎn)：相對之前的not in版本主鍵只能是整型字段,如主鍵為GUID類型請使用not in 模式的版本-------*/
CREATE PROCEDURE dbo.proc_ListPageInt
(
@tblName     nvarchar(200),        ----要顯示的表或多個(gè)表的連接
@fldName     nvarchar(500) = '*',    ----要顯示的字段列表
@pageSize    int = 10,        ----每頁顯示的記錄個(gè)數(shù)
@page        int = 1,        ----要顯示那一頁的記錄
@pageCount    int = 1 output,            ----查詢結(jié)果分頁后的總頁數(shù)
@Counts    int = 1 output,                ----查詢到的記錄數(shù)
@fldSort    nvarchar(200) = null,    ----排序字段列表或條件
@Sort        bit = 0,        ----排序方法，0為升序，1為降序(如果是多字段排列Sort指代最后一個(gè)排序字段的排列順序(最后一個(gè)排序字段不加排序標(biāo)記)--程序傳參如：' SortA Asc,SortB Desc,SortC ')
@strCondition    nvarchar(1000) = null,    ----查詢條件,不需where
@ID        nvarchar(150),        ----主表的主鍵
@Dist                 bit = 0           ----是否添加查詢字段的 DISTINCT 默認(rèn)0不添加/1添加
)
AS
SET NOCOUNT ON
Declare @sqlTmp nvarchar(1000)        ----存放動(dòng)態(tài)生成的SQL語句
Declare @strTmp nvarchar(1000)        ----存放取得查詢結(jié)果總數(shù)的查詢語句
Declare @strID     nvarchar(1000)        ----存放取得查詢開頭或結(jié)尾ID的查詢語句

Declare @strSortType nvarchar(10) ----數(shù)據(jù)排序規(guī)則A
Declare @strfsortType nvarchar(10) ----數(shù)據(jù)排序規(guī)則B

Declare @SqlSelect nvarchar(50) ----對含有DISTINCT的查詢進(jìn)行SQL構(gòu)造
Declare @SqlCounts nvarchar(50) ----對含有DISTINCT的總數(shù)查詢進(jìn)行SQL構(gòu)造

if @Dist = 0
begin
    set @SqlSelect = 'select '
    set @SqlCounts = 'Count(*)'
end
else
begin
    set @SqlSelect = 'select distinct '
    set @SqlCounts = 'Count(DISTINCT '+@ID+')'
end

if @Sort=0
begin
    set @strFSortType=' ASC '
    set @strSortType=' DESC '
end
else
begin
    set @strFSortType=' DESC '
    set @strSortType=' ASC '
end

--------生成查詢語句--------
--此處@strTmp為取得查詢結(jié)果數(shù)量的語句
if @strCondition is null or @strCondition=''     --沒有設(shè)置顯示條件
begin
    set @sqlTmp = @fldName + ' From ' + @tblName
    set @strTmp = @SqlSelect+' @Counts='+@SqlCounts+' FROM '+@tblName
    set @strID = ' From ' + @tblName
end
else
begin
    set @sqlTmp = + @fldName + 'From ' + @tblName + ' where (1>0) ' + @strCondition
    set @strTmp = @SqlSelect+' @Counts='+@SqlCounts+' FROM '+@tblName + ' where (1>0) ' + @strCondition
    set @strID = ' From ' + @tblName + ' where (1>0) ' + @strCondition
end

----取得查詢結(jié)果總數(shù)量-----
exec sp_executesql @strTmp,N'@Counts int out ',@Counts out
declare @tmpCounts int
if @Counts = 0
set @tmpCounts = 1
else
set @tmpCounts = @Counts

--取得分頁總數(shù)
set @pageCount=(@tmpCounts+@pageSize-1)/@pageSize

    /**//**當(dāng)前頁大于總頁數(shù) 取最后一頁**/
    if @page>@pageCount
        set @page=@pageCount

    --/*-----數(shù)據(jù)分頁2分處理-------*/
    declare @pageIndex int --總數(shù)/頁大小
    declare @lastcount int --總數(shù)%頁大小

    set @pageIndex = @tmpCounts/@pageSize
    set @lastcount = @tmpCounts%@pageSize
    if @lastcount > 0
        set @pageIndex = @pageIndex + 1
    else
        set @lastcount = @pagesize

    --//***顯示分頁
    if @strCondition is null or @strCondition=''     --沒有設(shè)置顯示條件
    begin
        if @pageIndex<2 or @page<=@pageIndex / 2 + @pageIndex % 2   --前半部分?jǐn)?shù)據(jù)處理
            begin
                if @page=1
                    set @strTmp=@SqlSelect+' top '+ CAST(@pageSize as VARCHAR(4))+' '+ @fldName+' from '+@tblName
                        +' order by '+ @fldSort +' '+ @strFSortType
                else
                begin
                    set @strTmp=@SqlSelect+' top '+ CAST(@pageSize as VARCHAR(4))+' '+ @fldName+' from '+@tblName
                        +' where '+@ID+' <(select min('+ @ID +') from ('+ @SqlSelect+' top '+ CAST(@pageSize*(@page-1) as Varchar(20)) +' '+ @ID +' from '+@tblName
                        +' order by '+ @fldSort +' '+ @strFSortType+') AS TBMinID)'
                        +' order by '+ @fldSort +' '+ @strFSortType
                end
            end
        else
            begin
            set @page = @pageIndex-@page+1 --后半部分?jǐn)?shù)據(jù)處理
                if @page <= 1 --最后一頁數(shù)據(jù)顯示
                    set @strTmp=@SqlSelect+' * from ('+@SqlSelect+' top '+ CAST(@lastcount as VARCHAR(4))+' '+ @fldName+' from '+@tblName
                        +' order by '+ @fldSort +' '+ @strSortType+') AS TempTB'+' order by '+ @fldSort +' '+ @strFSortType
                else
                    set @strTmp=@SqlSelect+' * from ('+@SqlSelect+' top '+ CAST(@pageSize as VARCHAR(4))+' '+ @fldName+' from '+@tblName
                        +' where '+@ID+' >(select max('+ @ID +') from('+ @SqlSelect+' top '+ CAST(@pageSize*(@page-2)+@lastcount as Varchar(20)) +' '+ @ID +' from '+@tblName
                        +' order by '+ @fldSort +' '+ @strSortType+') AS TBMaxID)'
                        +' order by '+ @fldSort +' '+ @strSortType+') AS TempTB'+' order by '+ @fldSort +' '+ @strFSortType
            end
    end

    else --有查詢條件
    begin
        if @pageIndex<2 or @page<=@pageIndex / 2 + @pageIndex % 2   --前半部分?jǐn)?shù)據(jù)處理
        begin
                if @page=1
                    set @strTmp=@SqlSelect+' top '+ CAST(@pageSize as VARCHAR(4))+' '+ @fldName+' from '+@tblName
                        +' where 1=1 ' + @strCondition + ' order by '+ @fldSort +' '+ @strFSortType
                else
                begin
                    set @strTmp=@SqlSelect+' top '+ CAST(@pageSize as VARCHAR(4))+' '+ @fldName+' from '+@tblName
                        +' where '+@ID+' <(select min('+ @ID +') from ('+ @SqlSelect+' top '+ CAST(@pageSize*(@page-1) as Varchar(20)) +' '+ @ID +' from '+@tblName
                        +' where (1=1) ' + @strCondition +' order by '+ @fldSort +' '+ @strFSortType+') AS TBMinID)'
                        +' '+ @strCondition +' order by '+ @fldSort +' '+ @strFSortType
                end
        end
        else
        begin
            set @page = @pageIndex-@page+1 --后半部分?jǐn)?shù)據(jù)處理
            if @page <= 1 --最后一頁數(shù)據(jù)顯示
                    set @strTmp=@SqlSelect+' * from ('+@SqlSelect+' top '+ CAST(@lastcount as VARCHAR(4))+' '+ @fldName+' from '+@tblName
                        +' where (1=1) '+ @strCondition +' order by '+ @fldSort +' '+ @strSortType+') AS TempTB'+' order by '+ @fldSort +' '+ @strFSortType
            else
                    set @strTmp=@SqlSelect+' * from ('+@SqlSelect+' top '+ CAST(@pageSize as VARCHAR(4))+' '+ @fldName+' from '+@tblName
                        +' where '+@ID+' >(select max('+ @ID +') from('+ @SqlSelect+' top '+ CAST(@pageSize*(@page-2)+@lastcount as Varchar(20)) +' '+ @ID +' from '+@tblName
                        +' where (1=1) '+ @strCondition +' order by '+ @fldSort +' '+ @strSortType+') AS TBMaxID)'
                        +' '+ @strCondition+' order by '+ @fldSort +' '+ @strSortType+') AS TempTB'+' order by '+ @fldSort +' '+ @strFSortType
        end
    end

------返回查詢結(jié)果-----
exec sp_executesql @strTmp
--print @strTmp
SET NOCOUNT OFF
GO
調(diào)用方法列子：
/**//// <summary>
    /// 通用分頁數(shù)據(jù)讀取函數(shù)
    /// 注意：在函數(shù)調(diào)用外部打開和關(guān)閉連接，以及關(guān)閉數(shù)據(jù)讀取器
    /// </summary>
    /// <param name="comm">SqlCommand對象</param>
    /// <param name="_tblName">查詢的表/表聯(lián)合</param>
    /// <param name="_fldName">要查詢的字段名</param>
    /// <param name="_pageSize">每頁數(shù)據(jù)大小</param>
    /// <param name="_page">當(dāng)前第幾頁</param>
    /// <param name="_fldSort">排序字段</param>
    /// <param name="_Sort">排序順序0降序1升序</param>
    /// <param name="_strCondition">過濾條件</param>
    /// <param name="_ID">主表主鍵</param>
    /// <param name="_dr">返回的SqlDataReader ref</param>
    public static void CutPageData(SqlConnection conn, ref SqlCommand comm, string _tblName, string _fldName, int _pageSize, int _page, string _fldSort, int _Sort, string _strCondition, string _ID, ref SqlDataReader _dr)
    {
        //注意：在函數(shù)調(diào)用外部打開和關(guān)閉連接，以及關(guān)閉數(shù)據(jù)讀取器
        //comm = new SqlCommand("proc_ListPage",conn);
        //comm.CommandType = CommandType.StoredProcedure;
        comm.Parameters.Add("@tblName", SqlDbType.NVarChar, 200);
        comm.Parameters["@tblName"].Value = _tblName;
        comm.Parameters.Add("@fldName", SqlDbType.NVarChar, 500);
        comm.Parameters["@fldName"].Value = _fldName;
        comm.Parameters.Add("@pageSize", SqlDbType.Int);
        comm.Parameters["@pageSize"].Value = _pageSize;
        comm.Parameters.Add("@page", SqlDbType.Int);
        comm.Parameters["@page"].Value = _page;
        comm.Parameters.Add("@fldSort", SqlDbType.NVarChar, 200);
        comm.Parameters["@fldSort"].Value = _fldSort;
        comm.Parameters.Add("@Sort", SqlDbType.Bit);
        comm.Parameters["@Sort"].Value = _Sort;
        comm.Parameters.Add("@strCondition", SqlDbType.NVarChar, 1000);
        comm.Parameters["@strCondition"].Value = _strCondition;
        comm.Parameters.Add("@ID", SqlDbType.NVarChar, 150);
        comm.Parameters["@ID"].Value = _ID;
        comm.Parameters.Add("@Counts", SqlDbType.Int, 0);
        comm.Parameters["@Counts"].Direction = ParameterDirection.Output;
        comm.Parameters.Add("@pageCount", SqlDbType.Int, 0);
        comm.Parameters["@pageCount"].Direction = ParameterDirection.Output;

_dr = comm.ExecuteReader();
}
調(diào)用例如：
CutPageData(conn, ref comm, "VOX_CDSinger", "id, cdsinger, cdsingertype, area, cdsingerreadme", 15, page, "id", 1, strFilter, "id", ref dr);
對應(yīng)說明：
CutPageData(數(shù)據(jù)連接對象, ref Sqlcommand對象, "需要表或視圖名稱", "要查詢的字段", 每頁讀取數(shù)據(jù)條數(shù), 當(dāng)前頁, "排序字段可多字段如(addtime desc, visitcounts注意這里最后一個(gè)字段不加desc或asc 最后一個(gè)字段對應(yīng)于后面的排序規(guī)則)", 排序方式(1 desc 0 asc), where條件（這里不再添加where條件添加如：' and visitcounts>100'）, 表主鍵, ref 返回的SqlDataReader對象);

這里的調(diào)用同樣適用于之前的not in版本.

呵呵這里獻(xiàn)給大家圣誕快樂！

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