2分法-通用存储过程分页(not in版本)

导读:
  dbo.proc_ListPage
  (@tblName nvarchar( 200), ----要显示的表或多个表的连接@fldName nvarchar( 500) = '*', ----要显示的字段列表@pageSize int = 1, ----每页显示的记录个数@page int = 10, ----要显示那一页的记录@pageCount int = 1 output, ----查询结果分页后的总页数@Counts int = 1 output, ----查询到的记录数@fldSort nvarchar( 200) = null, ----排序字段列表或条件@Sort bit = 0, ----排序方法,0为升序,1为降序(如果是多字段排列Sort指代最后一个排序字段的排列顺序(最后一个排序字段不加排序标记)--程序传参如:' SortA Asc,SortB Desc,SortC ')@strCondition nvarchar( 1000) = null, ----查询条件,不需where@ID nvarchar( 150), ----主表的主键@Dist bit = 0 ----是否添加查询字段的 DISTINCT 默认0不添加/1添加)ASSET NOCOUNT ONDeclare @sqlTmp nvarchar( 1000) ----存放动态生成的SQL语句Declare @strTmp nvarchar( 1000) ----存放取得查询结果总数的查询语句Declare @strID nvarchar( 1000) ----存放取得查询开头或结尾ID的查询语句Declare @strSortType nvarchar( 10) ----数据排序规则ADeclare @strFSortType nvarchar( 10) ----数据排序规则BDeclare @SqlSelect nvarchar( 50) ----对含有DISTINCT的查询进行SQL构造Declare @SqlCounts nvarchar( 50) ----对含有DISTINCT的总数查询进行SQL构造if @Dist = 0begin set @SqlSelect = 'select ' set @SqlCounts = 'Count(*)'endelsebegin set @SqlSelect = 'select distinct ' set @SqlCounts = 'Count(DISTINCT '+@ID+')'endif @Sort= 0begin set @strFSortType=' ASC ' set @strSortType=' DESC 'endelsebegin set @strFSortType=' DESC ' set @strSortType=' ASC 'end--------生成查询语句----------此处@strTmp为取得查询结果数量的语句if @strCondition is null or @strCondition=' --没有设置显示条件begin set @sqlTmp = @fldName + ' From ' + @tblName set @strTmp = @SqlSelect+' @Counts='+@SqlCounts+' FROM '+@tblName set @strID = ' From ' + @tblNameendelsebegin 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) ' + @strConditionend----取得查询结果总数量-----exec sp_executesql @strTmp,N'@Counts int out ',@Counts outdeclare @tmpCounts intif @Counts = 0 set @tmpCounts = 1else set @tmpCounts = @Counts --取得分页总数 set @pageCount=(@tmpCounts+@pageSize- 1)/@pageSize /**当前页大于总页数 取最后一页**/ if @page>@pageCount set @page=@pageCount --/*-----数据分页2分处理-------*/ declare @pageIndex int --总数/页大小 declare @lastcount int --总数%页大小 set @pageIndex = @tmpCounts/@pageSize set @lastcount = @tmpCounts%@pageSize if @lastcount > 0 set @pageIndex = @pageIndex + 1 else set @lastcount = @pagesize --//***显示分页 if @strCondition is null or @strCondition=' --没有设置显示条件 begin if @pageIndex< 2 or @page<=@pageIndex / 2 + @pageIndex % 2 --前半部分数据处理 begin
  set @strTmp=@SqlSelect+' top '+ CAST(@pageSize as VARCHAR( 4))+' '+ @fldName+' from '+@tblName +' where '+@ID+' not in('+ @SqlSelect+' top '+ CAST(@pageSize*(@page- 1) as Varchar( 20)) +' '+ @ID +' from '+@tblName +' order by '+ @fldSort +' '+ @strFSortType+')' +' order by '+ @fldSort +' '+ @strFSortType
  end else begin set @page = @pageIndex-@page+ 1 --后半部分数据处理 if @page <= 1 --最后一页数据显示 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+' not in('+ @SqlSelect+' top '+ CAST(@pageSize*(@page- 2)+@lastcount as Varchar( 20)) +' '+ @ID +' from '+@tblName +' order by '+ @fldSort +' '+ @strSortType+')' +' order by '+ @fldSort +' '+ @strSortType+') AS TempTB'+' order by '+ @fldSort +' '+ @strFSortType
  end end else --有查询条件 begin if @pageIndex< 2 or @page<=@pageIndex / 2 + @pageIndex % 2 --前半部分数据处理 begin
  set @strTmp=@SqlSelect+' top '+ CAST(@pageSize as VARCHAR( 4))+' '+ @fldName +' from '+@tblName +' where '+@ID+' not in('+ @SqlSelect+' top '+ CAST(@pageSize*(@page- 1) as Varchar( 20)) +' '+ @ID +' from '+@tblName +' Where (1>0) ' + @strCondition + ' order by '+ @fldSort +' '+ @strFSortType+')' +' ' + @strCondition + ' order by '+ @fldSort +' '+ @strFSortType
  end else begin
  set @page = @pageIndex-@page+ 1 --后半部分数据处理 if @page <= 1 --最后一页数据显示 set @strTmp=@SqlSelect+' * from ('+@SqlSelect+' top '+ CAST(@lastcount as VARCHAR( 4))+' '+ @fldName+' from '+@tblName +' where (1>0) '+ @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+' not in('+ @SqlSelect+' top '+ CAST(@pageSize*(@page- 2)+@lastcount as Varchar( 20)) +' '+ @ID +' from '+@tblName +' where (1>0) '+ @strCondition +' order by '+ @fldSort +' '+ @strSortType+')' + @strCondition +' order by '+ @fldSort +' '+ @strSortType+') AS TempTB'+' order by '+ @fldSort +' '+ @strFSortType
  end
  end------返回查询结果-----exec sp_executesql @strTmp--print @strTmpSET NOCOUNT OFF
  由于项目使用的GUID为主键字段,这里使用了not in这样的查询
  调用方法列子:
  /// /// 通用分页数据读取函数
  /// 注意:在函数调用外部打开和关闭连接,以及关闭数据读取器
  /// /// SqlCommand对象 /// 查询的表/表联合 /// 要查询的字段名 /// 每页数据大小 /// 当前第几页 /// 排序字段 /// 排序顺序0降序1升序 /// 过滤条件 /// 主表主键
  /// 返回的SqlDataReader ref
  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:在函数调用外部打开和关闭连接,以及关闭数据读取器
  //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();
  }
  调用例如:
  CutPageData(conn, ref comm, "VOX_CDSinger", "id, cdsinger, cdsingertype, area, cdsingerreadme", 15, page, "id", 1, strFilter, "id", ref dr);
  对应说明:
  CutPageData(数据连接对象, ref Sqlcommand对象, "需要表或视图名称", "要查询的字段", 每页读取数据条数, 当前页, "排序字段可多字段如(addtime desc, visitcounts注意这里最后一个字段不加desc或asc 最后一个字段对应于后面的排序规则)", 排序方式(1 desc 0 asc), where条件(这里不再添加where条件添加如:' and visitcounts>100'), 表主键, ref 返回的SqlDataReader对象);
  [最后修改由 yestar2000, 于 2007-07-03 01:08:58]

本文转自
http://www.yestar2000.com/article.asp?id=775

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