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ASP.NET操作EXCEL的总结篇

时间:2022-08-19 09:51:36 | 栏目:.NET代码 | 点击:

公元19XX年前,关于EXCEL的操作就如滔滔江水,连绵不绝,真正操作EXCEL我也是从去年下半年开始的,有些比较复杂的年度报表之类的,做起来也有点费力,不过还是都能画出来了,关于EXCEL的报表导出,考虑到导出耗时的问题我主要采用AJAX来做的,分别捕捉几个起止状态,给客户端提示3个状态:正在检索数据。。。---》准备导出数据。。。(只是从数据库成功取出,还没有读写excel文件)--》正在读写文件--》导出数据成功,当然如果哪一过程出错,都有对应的提示,只所以想到写这篇文章,主要是因为今年有个系统的部分EXCEL的操作也让我做,顺便结合之前操作EXCEL的经验作一下总结,可能也算不上什么,对于绝大多数来说也没什么技术含量,网上一搜一大把,但我想还是有必要总结一下,至少能给园子里的新手些许帮助,OK,Let's Go...

   一. 程序操作EXCEL的应用主要还是在统计报表方面,您可能会考虑读EXCEL模板,也可能会考虑没必要读模板,其实读不读模板都能达到一样的效果,看实际情况而用了。
       1. 读模板的话,首先模板存放在某个路径下,根据模板把从数据库里取出的数据写回EXCEL然后生成一个新的EXCEL存放都另一个路径以供下载,模板不变。
          我这里的EXCEL操作主要是在VS2005里的,VS2003也可以的,不过没怎么研究03里的操作(文章最后我会把05的示例下载地址贴上 那个demo里之前打包忘了放了一个生成数据的文件,刚放进去了,不加也是可以运行的,还有模板文件的数据稍微过滤了下重新放了部分对照看下)vs05中操作EXCEL直接引用.NET自带的COM组件 ,添加后项目的bin目录下会自动出现

Interop.Excel.dll这个DLL(需安装office2003 excel,下面的说明及示例都是基于office2003的,版本不同调用可能会不一样)
页面的命名空间引用 using Excel;
下面是调用模板的一段代码
复制代码 代码如下:

#region 使用模板导出Excel表
case "ReportByTemp":
{

DataView dv = Cache["ReportByTemp"] as DataView;
//建立一个Excel.Application的新进程
Excel.Application app = new Excel.Application();
if (app == null)
{
return;
}
app.Visible = false;
app.UserControl = true;
Workbooks workbooks = app.Workbooks;
_Workbook workbook = workbooks.Add(template_path + "\\EXCEL测试模板.xls");//这里的Add方法里的参数就是模板的路径
Sheets sheets = workbook.Worksheets;
_Worksheet worksheet = (_Worksheet)sheets.get_Item(1);//模板只有一个sheet表
if (worksheet == null)
{
return;
}

int rowNum = 0;
for (int i = 0; i < dv.Count; i++)
{
rowNum = i + 1;
worksheet.Cells[3 + i, 1] = rowNum;
worksheet.Cells[3 + i, 2] = dv[i].Row[0].ToString();
worksheet.Cells[3 + i, 3] = dv[i].Row[1].ToString();

excelOperate.SetBold(worksheet, worksheet.Cells[3 + i, 1], worksheet.Cells[3 + i, 1]); //黑体
excelOperate.SetHAlignCenter(worksheet, worksheet.Cells[3 + i, 1], worksheet.Cells[3 + i, 3]);//居中
worksheet.get_Range(worksheet.Cells[3 + i, 1], worksheet.Cells[3 + i, 3]).Borders.Color = System.Drawing.ColorTranslator.ToOle(System.Drawing.Color.Black);

}

tick = DateTime.Now.Ticks.ToString();
save_path = temp_path + "\\" + tick + ".xls";
workbook.SaveAs(save_path, Missing.Value, Missing.Value, Missing.Value, Missing.Value, Missing.Value, Excel.XlSaveAsAccessMode.xlNoChange, Missing.Value, Missing.Value, Missing.Value, Missing.Value, Missing.Value);
excelOperate.Dispose(worksheet, workbook, app);//关闭Excel进程

}
break;
#endregion

效果如下:


       2. 不读模板的话,调用的时候其实会继承一个空白模板,然后写入数据,程序画表头,最终达到一样的效果,程序如下:
复制代码 代码如下:

#region 不使用模板生成Excel表
case "ReportByNone":
{

DataView dv = Cache["ReportByNone"] as DataView;
//建立一个Excel.Application的新进程
Excel.Application app = new Excel.Application();
if (app == null)
{
return;
}
app.Visible = false;
app.UserControl = true;
Workbooks workbooks = app.Workbooks;
_Workbook workbook = workbooks.Add(XlWBATemplate.xlWBATWorksheet);//这里的Add方法里的参数就相当于继承了一个空模板(暂这样理解吧)
Sheets sheets = workbook.Worksheets;
_Worksheet worksheet = (_Worksheet)sheets.get_Item(1);
if (worksheet == null)
{
return;
}

worksheet.get_Range(worksheet.Cells[1, 1], worksheet.Cells[1, 3]).Merge(Missing.Value); //横向合并
worksheet.get_Range(worksheet.Cells[1, 1], worksheet.Cells[1, 1]).Value2 = "导出EXCEL测试一";
excelOperate.SetBold(worksheet, worksheet.Cells[1, 1], worksheet.Cells[1, 1]); //黑体
excelOperate.SetHAlignCenter(worksheet, worksheet.Cells[1, 1], worksheet.Cells[1, 1]);//居中
excelOperate.SetBgColor(worksheet, worksheet.Cells[1, 1], worksheet.Cells[1, 1], System.Drawing.Color.Red);//背景色
excelOperate.SetFontSize(worksheet, worksheet.Cells[1, 1], worksheet.Cells[1, 1], 16);//字体大小
excelOperate.SetRowHeight(worksheet, worksheet.Cells[1, 1], worksheet.Cells[1, 1], 32.25);//行高
worksheet.get_Range(worksheet.Cells[1, 1], worksheet.Cells[1, 1]).Borders.Color = System.Drawing.ColorTranslator.ToOle(System.Drawing.Color.Black);//黑色连续边框

worksheet.Cells[2, 1] = "序号";
worksheet.Cells[2, 2] = "公司";
worksheet.Cells[2, 3] = "部门";
excelOperate.SetBold(worksheet, worksheet.Cells[2, 1], worksheet.Cells[2, 3]); //黑体
worksheet.get_Range(worksheet.Cells[2, 1], worksheet.Cells[2, 3]).Borders.Color = System.Drawing.ColorTranslator.ToOle(System.Drawing.Color.Black);
excelOperate.SetHAlignRight(worksheet, worksheet.Cells[2, 1], worksheet.Cells[2, 3]);
excelOperate.SetBgColor(worksheet, worksheet.Cells[2, 1], worksheet.Cells[2, 3], System.Drawing.Color.Silver);//背景色
int rowNum = 0;
for (int i = 0; i < dv.Count; i++)
{
rowNum = i + 1;
worksheet.Cells[3 + i, 1] = rowNum;
worksheet.Cells[3 + i, 2] = dv[i].Row[0].ToString();
worksheet.Cells[3 + i, 3] = dv[i].Row[1].ToString();

excelOperate.SetBold(worksheet, worksheet.Cells[3 + i, 1], worksheet.Cells[3 + i, 1]); //黑体
excelOperate.SetHAlignCenter(worksheet, worksheet.Cells[3 + i, 1], worksheet.Cells[3 + i, 3]);//居中
worksheet.get_Range(worksheet.Cells[3 + i, 1], worksheet.Cells[3 + i, 3]).Borders.Color = System.Drawing.ColorTranslator.ToOle(System.Drawing.Color.Black);//设置边框颜色,不然打印预览,会非常不雅观

}
excelOperate.SetColumnWidth(worksheet, "A", 10);
excelOperate.SetColumnWidth(worksheet, "B", 20);
excelOperate.SetColumnWidth(worksheet, "C", 20);
worksheet.Name = "导出EXCEL测试一";

tick = DateTime.Now.Ticks.ToString();
save_path = temp_path + "\\"+ tick + ".xls";
workbook.SaveAs(save_path, Missing.Value, Missing.Value, Missing.Value, Missing.Value, Missing.Value, Excel.XlSaveAsAccessMode.xlNoChange, Missing.Value, Missing.Value, Missing.Value, Missing.Value, Missing.Value);
excelOperate.Dispose(worksheet, workbook, app);//关闭Excel进程

}
break;

#endregion

效果如下:


以上我给了两个最简单的操作说明,下面详细说一下对于一些稍微复杂的报表的生成处理

      二. 对于复杂的EXCEL报表的生成处理,无非是纵向合并相同的数据行及嵌套纵向合并等一些操作,下面就几个具有针对性的报表作下说明.
            1.要生成相对复杂的EXCEL表,在从数据库取数据时,要注意先按照合理的要求排好序,有时候可能order by后面要跟好几个字段,而且这几个字段谁先谁后也要注意,因为这些会直接影响报表呈现的效果,比如你的EXCEL表要按月份统计国内外的项目,显示出来的时候要多个项目相同的人连续,那么排序就可能要这样order by 月份,项目类别,用户ID,项目ID(这是写好的视图,基于视图来检索的),这个排序的字段顺序就不能变了,变了的话就不太好生成想要的形式了,如下图:

这个也是动态画的,用了个简单的模板,模板就一个表头,没多大意义,除非表头很复杂而且在列表中不需要重画,考虑模板就比较好,向上面那个一月份国际的和其它月份的都是需要重画表头的。至于合并,如果不是嵌套的合并,我们可以在向模板循环写数据的时候直接控制,比如下面一个简单的写法:
复制代码 代码如下:

for (i = 0; i < table.Rows.Count; i++)
{
bidName = table.Rows[index]["BIDNAME"].ToString();
if (table.Rows[i]["BIDNAME"].ToString() == bidName)
{
projNum++;
worksheet.Cells[5 + i, 2] = table.Rows[i]["PROJNO"];
worksheet.Cells[5 + i, 3] = table.Rows[i]["PROJNAME"];
worksheet.Cells[5 + i, 4] = table.Rows[i]["STAT_DATE"];
worksheet.Cells[5 + i, 5] = table.Rows[i]["PROJTYPE"];
worksheet.Cells[5 + i, 6] = table.Rows[i]["CONTENT"];
worksheet.Cells[5 + i, 7] = table.Rows[i]["OPENDT"];
worksheet.Cells[5 + i, 8] = table.Rows[i]["OPENADDRESS"];
worksheet.Cells[5 + i, 9] = table.Rows[i]["REV_DATE"];
worksheet.Cells[5 + i, 10] = table.Rows[i]["BID_UNIT"];
worksheet.Cells[5 + i, 11] = table.Rows[i]["AGT_AMOUNT"];
worksheet.Cells[5 + i, 12] = table.Rows[i]["CURRENCY"] + ":" + table.Rows[i]["BIDSER_AMOUNT"];
worksheet.Cells[5 + i, 13] = table.Rows[i]["SENDDATE"];
worksheet.Cells[5 + i, 14] = table.Rows[i]["CURRENCY"] + ":" + table.Rows[i]["BIDPRICE"];
worksheet.Cells[5 + i, 15] = table.Rows[i]["BOOKAMOUNT"];
worksheet.Cells[5 + i, 16] = table.Rows[i]["CURRENCY"] + ":" + table.Rows[i]["BAIL_AMOUNT"];
worksheet.Cells[5 + i, 17] = table.Rows[i]["USERNAME"];
worksheet.Cells[5 + i, 18] = table.Rows[i]["SECOND_USER"];
worksheet.Cells[5 + i, 19] = "";
worksheet.get_Range(worksheet.Cells[5 + i, 1], worksheet.Cells[5 + i, 19]).Borders.Color = System.Drawing.ColorTranslator.ToOle(System.Drawing.Color.Black);
continue;
}

worksheet.get_Range(worksheet.Cells[5 + rowid, 1], worksheet.Cells[5 + i - 1, 1]).Merge(Missing.Value); //将第一列按投标单位合并
worksheet.get_Range(worksheet.Cells[5 + rowid, 1], worksheet.Cells[5 + rowid, 1]).Value2 = bidName + "(" + projNum.ToString() + "个项目)";//合并后的单元格内容

合并单元格的时候也要注意一个问题,就是合并的单元格必须是为空的,不然在执行合并时,会提示“合并后的单元格的值将丢失”,具体不这样提示的,大致是这个意思,一般我们合并都单元格相同的内容,在合并前我们先保存那个值,再清空后合并,上面的代码中把worksheet.Cell[5+rowid,1]这里系列的单元格的值空出来了,没写数据,而且最后合并了再写值,避免了去循环清空。
     2.嵌套的合并向上面那样做可能控制比较麻烦,而且思路可能很混乱,我们可以考虑先循环填充所有的数据,在循环出来要合并的列,比如像下面的这张表

先循环填充数据,如下:
复制代码 代码如下:

int index = 0, rownum = 0;
string ProjNo = "";
for (i = 0; i < table.Rows.Count; i++)
{
ProjNo = table.Rows[index]["PROJNO"].ToString();
if (table.Rows[i]["PROJNO"].ToString() == ProjNo)
{
wksheet.Cells[3 + i, 1] = rownum + 1;
wksheet.Cells[3 + i, 2] = "'" + table.Rows[i]["PROJNO"]; //加上单引号保证以0开头的字符原样输出
wksheet.Cells[3 + i, 3] = "'" + table.Rows[i]["PROJNAME"];
wksheet.Cells[3 + i, 4] = "'" + table.Rows[i]["PA_NAME"];
wksheet.Cells[3 + i, 5] = "'" + table.Rows[i]["BIDER_NAME"];
wksheet.Cells[3 + i, 6] = table.Rows[i]["BAIL_AMOUNT"];
wksheet.Cells[3 + i, 7] = table.Rows[i]["NOT_BACK"];
wksheet.get_Range(wksheet.Cells[3 + i, 1], wksheet.Cells[3 + i, 7]).Borders.Color = System.Drawing.ColorTranslator.ToOle(System.Drawing.Color.Black);
continue;
}
index = i;
rownum++;
i--;
}

下面合并前三列相同内容的单元:
复制代码 代码如下:

//合并前三列操作
int m = 1, rowid = 3, k;
string projName = "";
for (k = 3; k <= i + 2; k++)
{
if (Convert.ToInt32(wksheet.get_Range(wksheet.Cells[k, 1], wksheet.Cells[k, 1]).Value2) == m)
{
ProjNo = wksheet.get_Range(wksheet.Cells[k, 2], wksheet.Cells[k, 2]).Value2.ToString();
projName = wksheet.get_Range(wksheet.Cells[k, 3], wksheet.Cells[k, 3]).Value2.ToString();
wksheet.get_Range(wksheet.Cells[k, 1], wksheet.Cells[k, 1]).Value2 = "";
wksheet.get_Range(wksheet.Cells[k, 2], wksheet.Cells[k, 2]).Value2 = "";
wksheet.get_Range(wksheet.Cells[k, 3], wksheet.Cells[k, 3]).Value2 = "";
continue;
}
wksheet.get_Range(wksheet.Cells[rowid, 1], wksheet.Cells[k - 1, 1]).Merge(Missing.Value);
wksheet.get_Range(wksheet.Cells[rowid, 1], wksheet.Cells[rowid, 1]).Value2 = m;
wksheet.get_Range(wksheet.Cells[rowid, 2], wksheet.Cells[k - 1, 2]).Merge(Missing.Value);
wksheet.get_Range(wksheet.Cells[rowid, 2], wksheet.Cells[rowid, 2]).Value2 = "'" + ProjNo;
wksheet.get_Range(wksheet.Cells[rowid, 3], wksheet.Cells[k - 1, 3]).Merge(Missing.Value);
wksheet.get_Range(wksheet.Cells[rowid, 3], wksheet.Cells[rowid, 3]).Value2 = "'" + projName;
m++;
rowid = k;
k--;
}
//跳出循环后合并最后一个招标项目
wksheet.get_Range(wksheet.Cells[rowid, 1], wksheet.Cells[k - 1, 1]).Merge(Missing.Value);
wksheet.get_Range(wksheet.Cells[rowid, 1], wksheet.Cells[rowid, 1]).Value2 = m;
wksheet.get_Range(wksheet.Cells[rowid, 2], wksheet.Cells[k - 1, 2]).Merge(Missing.Value);
wksheet.get_Range(wksheet.Cells[rowid, 2], wksheet.Cells[rowid, 2]).Value2 = "'" + ProjNo;
wksheet.get_Range(wksheet.Cells[rowid, 3], wksheet.Cells[k - 1, 3]).Merge(Missing.Value);
wksheet.get_Range(wksheet.Cells[rowid, 3], wksheet.Cells[rowid, 3]).Value2 = "'" + projName;

下面合并标段列
复制代码 代码如下:

//合并标段列
index = 0; rowid = 3; //重置变量
string pa_name = string.Empty; //标段名称
for (k = 3; k <= i + 2; k++)
{
pa_name = table.Rows[index]["PA_NAME"].ToString();
if (wksheet.get_Range(wksheet.Cells[k, 4], wksheet.Cells[k, 4]).Value2.ToString() == pa_name)
{
wksheet.get_Range(wksheet.Cells[k, 4], wksheet.Cells[k, 4]).Value2 = "";
continue;
}
wksheet.get_Range(wksheet.Cells[rowid, 4], wksheet.Cells[k - 1, 4]).Merge(Missing.Value);
wksheet.get_Range(wksheet.Cells[rowid, 4], wksheet.Cells[rowid, 4]).Value2 = "'" + pa_name;
index = k - 3;
rowid = k;
k--;
}
//退出循环时合并最后一个项目的标段
wksheet.get_Range(wksheet.Cells[rowid, 4], wksheet.Cells[k - 1, 4]).Merge(Missing.Value);
wksheet.get_Range(wksheet.Cells[rowid, 4], wksheet.Cells[rowid, 4]).Value2 = "'" + pa_name;
tick = DateTime.Now.ToString("yyyyMMddhhmmss");
save_path = temp_path + "\\" + tick + "保证金收退情况表.xls";
Session["BailBackID"] = tick + "保证金收退情况表.xls";
Session["_BailBack"] = "true";
workbook.SaveAs(save_path, Missing.Value, Missing.Value, Missing.Value, Missing.Value, Missing.Value, Excel.XlSaveAsAccessMode.xlNoChange, Missing.Value, Missing.Value, Missing.Value, Missing.Value, Missing.Value);
excelOperate.Dispose(worksheet, workbook, app);//关闭Excel进程
//DownLoad(save_path);
//Page_Close();

当然,上面的操作中会进行好几次循环,在性能方面不太可取,园子里的兄弟也许会有更好的方法,小弟不吝赐教了
下面我们看下几个效果图:





(注意:这里提示的导出数据是指从数据库成功取出数据,还没有操作EXCEL对象,刚开始已经说过了,当然这个提示文字换成其它的也可以)




整个过程采用AJAX提示的,一来不刷新,二来导出时间比较长的话,可以给客户一个良好的体验效果,否可,用户一点导出按钮,半天没反应也没提示,客户就觉得怎么这么慢的,是不是你们程序有问题,指责一大堆,有了这么些交互提示信息,让客户多等几分钟也能承受。

     3.生成的表格包含多个sheet的操作,比如下面一种情况


绘制这张表的要求是根据选择某年的几月到几月,生成这个几个月的一个综合情况的sheet,然后分别生成这几个月的单独的sheet表,生成上面表的模板,包含两个sheet ,一个综合月份的sheet和一个单独月份的sheet,因为单独月份的sheet表现形式都是一样的,我们可以根据选择的月份个数Copy几个sheet就可以了
复制代码 代码如下:

Workbooks workbooks = app.Workbooks;
_Workbook workbook = workbooks.Add(template_path + "\\招标单位年度招标情况逐月统计表.xls");
Sheets sheets = workbook.Worksheets;
_Worksheet Yearsheet = (_Worksheet)sheets.get_Item(1);
_Worksheet worksheet = (_Worksheet)sheets.get_Item(2);
if (worksheet == null)
{
return;
}
for (int i = 1; i < monthCount; i++)
worksheet.Copy(Missing.Value, workbook.Worksheets[2]);//月统计工作薄

Yearsheet的操作就不说了,和前面几个一样操作,关键是月份的sheet的生成,其实就是循环操作get_Item(i),代码如下
复制代码 代码如下:

//////////////////////////////////////每月详细统计////////////////////////////////////
int item_id = 2;
rowNum = 0; book_Amount = 0; index = 0;
bid_Amount = ""; bidser_Amount = ""; agent_Amount = 0;//清空变量
_Worksheet ws = null;
for (int i = 0; i < tableMM.Rows.Count; i++)
{
rowNum++;
Month = tableMM.Rows[index]["DATE_MONTH"].ToString();
if (tableMM.Rows[i]["DATE_MONTH"].ToString() == Month)
{
ws = (_Worksheet)sheets.get_Item(item_id);
ws.Cells[3 + rowNum - 1, 1] = rowNum;
ws.Cells[3 + rowNum - 1, 2] = tableMM.Rows[i]["PROJNO"];
ws.Cells[3 + rowNum - 1, 3] = tableMM.Rows[i]["PROJNAME"];
ws.Cells[3 + rowNum - 1, 4] = tableMM.Rows[i]["BID_TYPE"];
ws.Cells[3 + rowNum - 1, 5] = tableMM.Rows[i]["BID_MODE"];
ws.Cells[3 + rowNum - 1, 6] = tableMM.Rows[i]["OPENDT"];
ws.Cells[3 + rowNum - 1, 7] = tableMM.Rows[i]["OPENADDRESS"];
ws.Cells[3 + rowNum - 1, 8] = tableMM.Rows[i]["BID_UNIT"];
ws.Cells[3 + rowNum - 1, 9] = tableMM.Rows[i]["NOTICE_NO"].ToString().Replace("神华国贸", "");
ws.Cells[3 + rowNum - 1, 10] = tableMM.Rows[i]["BOOKAMOUNT"];
ws.Cells[3 + rowNum - 1, 11] = tableMM.Rows[i]["BIDPRICE"] + "(万" + tableMM.Rows[i]["CURRENCY"] + ")";
ws.Cells[3 + rowNum - 1, 12] = tableMM.Rows[i]["BIDSER_AMOUNT"] + "(万" + tableMM.Rows[i]["CURRENCY"]+")";
ws.Cells[3 + rowNum - 1, 13] = tableMM.Rows[i]["AGT_AMOUNT"];
ws.Cells[3 + rowNum - 1, 14] = "";
ws.get_Range(ws.Cells[3 + rowNum - 1, 1], ws.Cells[3 + rowNum - 1, 14]).Borders.Color = System.Drawing.ColorTranslator.ToOle(System.Drawing.Color.Black);
continue;
}
ws.Cells[1, 1] = year + "年" + bidName + GetMonth(Month) + "月份招标项目情况一览表";
//每月合计
sql = " SELECT CURRENCY, NVL(SUM(BIDPRICE),0) AS BIDPRICE,NVL(SUM(BOOKAMOUNT),0) AS BOOKAMOUNT,NVL(SUM(BIDSER_AMOUNT),0) AS BIDSER_AMOUNT,NVL(SUM(AGT_AMOUNT),0) AS AGT_AMOUNT FROM IBS_V_BID_MONTHLY_STAT" + SqlFilter +
" AND DATE_YEAR ='" + year + "' AND COMPANY_ID=" + biderID + " AND DATE_MONTH ='" + Month + "'" +
" GROUP BY CURRENCY";
System.Data.DataTable dt1 = OracleHelper.RetDataTable(sql);
for (int m = 0; m < dt1.Rows.Count; m++)
{
bid_Amount += dt1.Rows[m]["BIDPRICE"] + "(万"+dt1.Rows[m]["CURRENCY"] + ")\r\t";
book_Amount += float.Parse(dt1.Rows[m]["BOOKAMOUNT"].ToString());
bidser_Amount += dt1.Rows[m]["BIDSER_AMOUNT"] + "(万" + dt1.Rows[m]["CURRENCY"] + ")\r\t";
agent_Amount += float.Parse(dt1.Rows[m]["AGT_AMOUNT"].ToString());
}
ws.Cells[3 + rowNum - 1, 3] = "合 计";
ws.Cells[3 + rowNum - 1, 10] = book_Amount;
ws.Cells[3 + rowNum - 1, 11] = bid_Amount;
ws.Cells[3 + rowNum - 1, 12] = bidser_Amount;
ws.Cells[3 + rowNum - 1, 13] = agent_Amount;
ws.get_Range(ws.Cells[3 + rowNum - 1, 1], ws.Cells[3 + rowNum - 1, 14]).Borders.Color = System.Drawing.ColorTranslator.ToOle(System.Drawing.Color.Black);
ws.Name = GetMM(Month);
item_id++;
index = i; //汇总下一个月份的招标项目
i--;
rowNum = 0; book_Amount = 0;
bid_Amount = ""; bidser_Amount = ""; agent_Amount = 0;//清空变量
}
//跳出循环时进行最后一个月份的项目汇总

用的是oracle数据库,所以上面那个sql语句。。。 呵呵
============================================================================================
上面大致说得就差不多了,因为是不断循环的什么的,可能对于大的数据量读写来说,比较好性能,如果大家有什么更好的方法,可以指点下,为了弥补等待时间过长,所以才结合了AJAX来处理。
最后我把做的一个小demo的链接帖出来给大家,还有一些空模板和对应生成的数据表给大家对照看下,尤其相对复杂一些的表画应该是能画出来的,主要看大家采用什么样的方法,能少循环一次就尽量少循环,呵呵~~~
EXCEL模板读写说明
http://www.justlike.com.cn/upfiles/template_xls.rar
http://www.justlike.com.cn/upfiles/ExcelFiles.rar
http://www.justlike.com.cn/upfiles/ExcelReportDemo.rar
(说明:最后弹出下载文件的一个页面一直想让其自动关掉,但是不行,如果不关掉,再点导出,不会弹出下载框,实际的处理中我们可以在导出旁边放个下载按钮,就像上面的效果图里那样,当然可以点导出的时候让其在网页中直接打开,点下载的时候再弹出下载框,但是直接打开的话,文件需要生成在虚拟目录下,不太安全,呵呵~~,看实际情况处理了)
==========================================================================================
今天补充说明下,关于那个调用ajax回调的效果,有个地方用到了所谓的“ajax嵌套调用”,如下

复制代码 代码如下:

function ExcelReportCallback(resp)
{
if(resp.value == "OK")
{
$('tipMsg').innerHTML = "<img border=\"0\" src=\"images/s_progressbar.gif\"><font color=#FF0000 style=font-weight:bold>准备导出数据,请稍等</font>";
setTimeout("RedirectUrl()",1000);//延时体验
}
else
if(resp.value == "NO")
{
$('tipMsg').innerHTML = "<font color=#FF0000 style=font-weight:bold>没有找到符合该查询条件的数据</font>";
$('btnExcel').disabled = false;
}
else
{
$('tipMsg').innerHTML = "<font color=#FF0000 style=font-weight:bold>警告:导出数据出错</font>";
$('btnExcel').disabled = false;
}

}

复制代码 代码如下:

function RedirectUrl()
{
$('tipMsg').innerHTML = "<img border=\"0\" src=\"images/ajaxloading.gif\"><font color=#7fffd4 style=font-weight:bold>正在读写报表文件,请稍后</font>";
var ajax = new ajax_request("ExcelReport.aspx?flag=ReportByTemp&"+Math.random(), "", "", ReportCallback);
function ReportCallback(resp)
{
if(resp.value != "Error" && resp.value !="")
{
$('btnExcel').disabled = false;
$('tipMsg').innerHTML = "<font color=#FF0000 style=font-weight:bold>数据导出成功!</font>";
Open("XLS_DownLoad.aspx?path="+resp.value);//window.location.href = resp.value;//
}
else
{
$('btnExcel').disabled = false;
$('tipMsg').innerHTML = "<font color=#FF0000 style=font-weight:bold>文件读写出错,请检查文件模板是否存在或对文件是否有读写权限!</font>";
}
}
}
function Open(url)
{
window.open(url,'newwindow','height=1,width=1,top=1500,left=1500,toolbar=no,menubar=no,scrollbars=yes,location=no,status=no')
}

ExcelReportCallback(resp)原本是一个回调函数,但是里面调用了一个RedirectUrl()方法,这个方法又包含了一个回调函数,这样就形成了回调的嵌套,之所以这么做,是因为,第一个回调是处理从数据库取出数据成功与否,如果成功了跳转到画EXCEL的页面,这样的话会出现一个空白页等生成好后出现下载框,后来觉得是否可以嵌套一个回调来继续一次异步操作,这样就不会出现长时间等待的空白页面了,而是生成好EXCEL后返回地址,或者可以返回一个文件名到XLS_DownLoad.aspx页面直接下载,但是XLS_DownLoad.aspx也是要出现的,我尝试过让下载后这个页面自动关闭,无赖做不到,所以把Open()方法里的数据值调得让页面不显示,但是状态栏还是有显示的。
到这里算是写完了,决定奢侈下,放到首页下:),总觉得首页的文章只有高手才能放,而且放到首页也是一种奢侈,希望对园子里的某些人有一定的帮助吧~~
http://xiazai.jb51.net/201102/yuanma/ExcelReport.rar

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