http://dotnet.aspx.cc/article/421ac2d7-7c87-4063-a14b-c6f7c7ffbf43/read.aspx
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数据库的内容直接导入到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 StringDim 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.OleDbCommandcn.Opensql = "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.ExecuteNonQuerycn.Closecn.Disposecn = NothingEnd Sub