ASP.NET 2.0中直接将Access数据库导入到Excel中

在实际的开发应用中,数据库导入导出是经常遇到的问题,尤其是数据库与Excel文件之间的导入导出,还存在数据类型不一致的问题。例如:数据库的数字超长时会在Excel里格式化成科学计数法的格式,或者记录内容是数字和字符的混合内容会丢失内容等等。将Access的内容直接导入到Excel则可以避免这些问题。

下面例子就是实现这个功能,例子中的数据库使用《ASP.NET 2.0应用开发技术》一书中自带的数据库为例子。

另外,需要注意:Excel文件有诸多限制,在如果数据库记录内容很多,还要计算每次导出的数量和Sheet数目,另外,对Sheet名字相同的监测也省略了,需要的读者请根据情况自行添加上去。结合存储过程的分页功能实现起来比较好。

C#

<%@ Page Language="C#" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional //EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<script runat="server">
 protected void Button1_Click(object sender, EventArgs e)
 {
  string sql;
  string connstr = @"Provider=Microsoft.Jet.OLEDB.4.0;   Data Source=|DataDirectory|ASPNET20Book.mdb;Persist Security Info=True";
  System.Data.OleDb.OleDbConnection cn =    new System.Data.OleDb.OleDbConnection(connstr);
  System.Data.OleDb.OleDbCommand cmd;
  cn.Open();
  //先得到记录数目:
  sql = "select Count(*) From Paging";
  cmd = new System.Data.OleDb.OleDbCommand(sql, cn);
  int RecordCount = (int)cmd.ExecuteScalar();
  // TODO:计算Sheet数目,进行记录分段,    将不同的数据段导入到不同的Sheet(Sheet数目不知道有没有限制:())
  // TODO:文件名,Sheet名字的存在检测略
  //每个Sheet只能最多保存65536条记录。
  sql = @"select top 65535 * into [Excel 8.0;database=" +    Server.MapPath(".") + @"ASPNET20Book.xls].[Sheet1] from Paging";
  cmd = new System.Data.OleDb.OleDbCommand(sql, cn);
  cmd.ExecuteNonQuery();
  cn.Close();
  cn.Dispose();
  cn = null;
 }
</script>
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
 <title>直接将Access数据库导入到Excel文件</title>
</head>
<body>
 <form id="form1" runat="server">
  <asp:Button ID="Button1" runat="server"    OnClick="Button1_Click" Text="到处数据">
 </form>
</body>
</html>

VB.NET:

Protected Sub Button1_Click(ByVal sender As Object, ByVal e As EventArgs)
Dim sql As String
Dim connstr As String = "Provider=Microsoft.Jet.OLEDB.4.0;Data  Source=|DataDirectory|ASPNET20Book.mdb;Persist Security Info=True"
Dim cn As System.Data.OleDb.OleDbConnection =  New System.Data.OleDb.OleDbConnection(connstr)
Dim cmd As System.Data.OleDb.OleDbCommand
cn.Open
sql = "select Count(*) From Paging"
cmd = New System.Data.OleDb.OleDbCommand(sql, cn)
Dim RecordCount As Integer = CType(cmd.ExecuteScalar, Integer)
sql = "select top 65535 * into [Excel 8.0;database=" +  Server.MapPath(".") + "ASPNET20Book.xls].[Sheet1] from Paging"
cmd = New System.Data.OleDb.OleDbCommand(sql, cn)
cmd.ExecuteNonQuery
cn.Close
cn.Dispose
cn = Nothing
End Sub