一种常见（粒度，统计值）报表的实现方案

语言：C#
开发环境：Vs2008

1。实现目标
很多时候，我经常要做如下这样的一张报表：
纵向为统计粒度，横向为指标值， 本例中合计是没有意义的，只是为了演示

2。具体实现
从数据库中取出三张表（DataTable）：
表1，命名为：VTable，作用：保存纵向统计力度的名称列表
表2，命名为：HTable，作用：保存横向指标的名称列表
表3，命名为：CellTable，作用：保存指标值

然后将三张表合在一个DataSet里，通过DataSet的GetXml()方法取得一个XML字符串，
这样，有了这个Xml字符串，配上通用的Xslt，就可以使用Asp:Xml控件进行展现

以下开始演示：
我建了三张表：StudentInfo, SubjectInfo, ScoreInfo
结合上图，很容易知道三张表各自的用途



看下面取DataSet数据源的代码：

private  DataSet GetDataSet()  {
            string sql1 = "select StudentName VName from StudentInfo";
            string sql2 = "select SubjectName HName from SubjectInfo";
            string sql3 = @"select StudentName VName,SubjectName HName,Score CellValue
                            from ScoreInfo s, StudentInfo std,SubjectInfo subj
                            where s.StudentId=std.StudentId and s.SubjectId=subj.SubjectId";
            DataSet ds = new DataSet();
            using (SqlConnection conn = new SqlConnection(ConfigurationManager.ConnectionStrings["DbConnString"].ConnectionString)) {
                conn.Open();
                SqlDataAdapter da = new SqlDataAdapter(sql1, conn);
                da.Fill(ds, "VTable");
                da = new SqlDataAdapter(sql2, conn);
                da.Fill(ds, "HTable");
                da = new SqlDataAdapter(sql3, conn);
                da.Fill(ds, "CellTable");
                return ds;
            }
        }

有几个约定：表名（VTable,HTable,CellTable），列名(VName,HName,CellValue)

再看下面的XSLT：

<? xml version = " 1.0 "  encoding = " UTF-8 "   ?>
< xsl:stylesheet version = " 1.0 "  xmlns:xsl = " http://www.w3.org/1999/XSL/Transform " >
   <!--
    written by Guozhijian
     2008 / 01 / 04
   -->
   < xsl:output method = " html " />
     < xsl:template match = " / " >
         < style type = " text/css " >
      .lborder3  {border:1px solid #000000;font-family:Tahoma;font-size:12px;}
      .mbodymain  {text-align:center;background-color:#ffffff;}
     </ style >
         < table  class = " lborder3 "  cellpadding = " 3 "  cellspacing = " 1 "  align = " center " >
             < xsl:call - template name = " tplH " />
             < xsl:call - template name = " tplV " />
             < xsl:call - template name = " tplLastLine " />
         </ table >
     </ xsl:template >
   <!-- 横向表头模版 -->
     < xsl:template name = " tplH " >
         < tr >
             < td  class = " mbodyMain " ></ td >
             < xsl: for - each select = " NewDataSet/HTable " >
                 < td  class = " mbodyMain " >
                     < xsl:value - of select = " HName " />
                 </ td >
             </ xsl: for - each >
             < td  class = " mbodyMain " > 合计 </ td >
         </ tr >
     </ xsl:template >
   <!-- 纵向表头模版 -->
     < xsl:template name = " tplV " >
         < xsl: for - each select = " NewDataSet/VTable " >
             < tr >
                 < td  class = " mbodyMain " >< xsl:value - of select = " VName " /></ td >
                 < xsl:variable name = " vname "  select = " VName " />
                 < xsl: for - each select = " /NewDataSet/HTable " >
                     < td  class = " mbodyMain " >
                         < xsl:call - template name = " tplCellValue " >
                             < xsl:with - param name = " vName "  select = " $vname " />
                             < xsl:with - param name = " hName "  select = " HName " />
                         </ xsl:call - template >
                     </ td >
                 </ xsl: for - each >
                 < td  class = " mbodyMain " >
                     < xsl:call - template name = " tplHSum " >
                         < xsl:with - param name = " vName "  select = " $vname " />
                     </ xsl:call - template >
                 </ td >
             </ tr >
         </ xsl: for - each >
     </ xsl:template >
   <!-- 数据单元格模版 -->
     < xsl:template name = " tplCellValue " >
         < xsl:param name = " vName " />
         < xsl:param name = " hName " />
         < xsl:choose >
             < xsl:when test = " count(/NewDataSet/CellTable[VName=$vName and HName=$hName]) &gt; 0 " >
                 < xsl:value - of select = " /NewDataSet/CellTable[VName=$vName and HName=$hName]/CellValue " />
             </ xsl:when >
             < xsl:otherwise > 0 </ xsl:otherwise >
         </ xsl:choose >
     </ xsl:template >
   <!-- 横向统计值模版 -->
     < xsl:template name = " tplHSum " >
         < xsl:param name = " vName " />
         < xsl:value - of select = " sum(/NewDataSet/CellTable[VName=$vName]/CellValue) " />
     </ xsl:template >
   <!-- 纵向统计值模版 -->
     < xsl:template name = " tplVSum " >
         < xsl:param name = " hName " />
         < xsl:value - of select = " sum(/NewDataSet/CellTable[HName=$hName]/CellValue) " />
     </ xsl:template >
   <!-- 尾行统计值模版 -->
     < xsl:template name = " tplLastLine " >
         < tr >
             < td  class = " mbodyMain " > 合计 </ td >
             < xsl: for - each select = " NewDataSet/HTable " >
                 < td  class = " mbodyMain " >
                     < xsl:call - template name = " tplVSum " >
                         < xsl:with - param name = " hName "  select = " HName " />
                     </ xsl:call - template >
                 </ td >
             </ xsl: for - each >
             < td  class = " mbodyMain " >
                 < xsl:value - of select = " sum(NewDataSet/CellTable/CellValue) " />
             </ td >
         </ tr >
     </ xsl:template >
</ xsl:stylesheet >

  

在XSLT中计算了合计值

通过Asp:Xml控件（x1)展现：

private   void  ShowData()  {
            DataSet ds = this.GetDataSet();
            string xml = ds.GetXml();
            x1.DocumentContent = xml;
            x1.TransformSource = "HVReport.xslt";
        }

搞定！
这样，当需要做这样的报表的时候，只需要写3条非常简单的sql语句就完成了。
^_^