引言：
导入Excel数据时候，因为数据量大，使用 linq 操作插入的时候，很慢。考虑使用ado.net操作数据库方式导入数据。由于数据量比较大使用SqlBulkCopy来实现批量导入。
一.代码解释：
1.将要导入的excel上传保存到服务器。
2.使用OleDbDataAdapter获取excel中的数据插入tab中。
3.在内存中创建一个表newDT，将tab表做修改后更新到newDT中。
4.使用SqlBulkCopy批量将newDT内存表数据插入到数据库表Sys_StuUser中。
二.代码如下：
string FileUrl = string.Empty;
foreach (HttpPostedFileBase file in fileToUpload)
{
string path = System.IO.Path.Combine(Server.MapPath("~/Models/stu/UpLoadExc"), System.IO.Path.GetFileName(DateTime.Now.ToString("yyyymmddhhMMss") + file.FileName));
file.SaveAs(path);//SaveAs 将上传的文件内容保存在服务器上
FileUrl = path;
}
string result = string.Empty;
string strConn;
strConn = "Provider=Microsoft.Jet.OLEDB.4.0;" + "Data Source=" + FileUrl + "; " + "Extended Properties=Excel 8.0;";
OleDbConnection conn = new OleDbConnection(strConn);
OleDbDataAdapter myCommand = new OleDbDataAdapter("SELECT * FROM [Sheet1$]", conn);
DataSet myDataSet = new DataSet();
myCommand.Fill(myDataSet, "ExcelInfo");
System.Data.DataTable tab = myDataSet.Tables["ExcelInfo"].DefaultView.ToTable();
var majordata = MajorInfoService.LoadEntities(u => true).ToList();
var schooldata = UniversityInfoService.LoadEntities(u => true).ToList();
// ...用foreach把tab中数据添加到数据库
DataTable newDT = new DataTable();
//newDT.Columns.Add("LoginID", typeof(string));
newDT.Columns.Add("Pwd", typeof(string));
newDT.Columns.Add("UserName", typeof(string));
newDT.Columns.Add("Education", typeof(int));
newDT.Columns.Add("Major", typeof(int));
newDT.Columns.Add("StuOrigin", typeof(string));
newDT.Columns.Add("Gender", typeof(int));
newDT.Columns.Add("Destination", typeof(int));
newDT.Columns.Add("HomeTel", typeof(string));
newDT.Columns.Add("Tel", typeof(string));
newDT.Columns.Add("Emai", typeof(string));
newDT.Columns.Add("StudentID", typeof(string));
newDT.Columns.Add("School", typeof(int));
newDT.Columns.Add("GradYear", typeof(string));
newDT.Columns.Add("IdentityID", typeof(string));
//newDT.Columns.Add("IfJoin", typeof(string));
//newDT.Columns.Add("Vcode", typeof(string));
//newDT.Columns.Add("Flag", typeof(int));
//newDT.Columns.Add("SID", typeof(string));
for (int i = 0; i < tab.Rows.Count - 1; i++)
{
DataRow dr = tab.Rows[i];
string SchoolTag = dr["学校代码"].ToString().Trim();
string MajorID = dr["专业代码"].ToString().Trim();
string DestinationID = dr["毕业去向"].ToString().Trim();
string EducationID = dr["学历代码"].ToString().Trim();
var schoolid = (from s in schooldata where s.UCode == SchoolTag select new { s.UID }).
FirstOrDefault();
var majorid =
(from m in majordata where m.MajorCode == MajorID select new { m.MajorID }).FirstOrDefault();
DataRow newRow = newDT.NewRow();
newRow["Pwd"] = "0B946149D7DDE1A273F26402A344008E";
newRow["UserName"] = dr["姓名"].ToString().Trim();
switch (EducationID)
{
case "01": newRow["Education"] = 4; break;
case "11": newRow["Education"] = 3; break;
case "31": newRow["Education"] = 2; break;
case "41": newRow["Education"] = 1; break;
default: newRow["Education"] = 0; break;
}
newRow["Major"] = majorid == null ? 0 : majorid.MajorID;
newRow["StuOrigin"] = dr["生源地"].ToString().Trim();
newRow["Gender"] = dr["性别代码"] == null ? 0 : Convert.ToInt32(dr["性别代码"].ToString().Trim());
switch (DestinationID)
{
case "01": newRow["Destination"] = 1; break;
case "02": newRow["Destination"] = 2; break;
case "03": newRow["Destination"] = 3; break;
case "04": newRow["Destination"] = 4; break;
default: newRow["Destination"] = 0; break;
}
newRow["HomeTel"] = dr["家庭电话"].ToString().Trim();
newRow["Tel"] = dr["手机号码"].ToString().Trim();
newRow["Emai"] = dr["电子邮箱"].ToString().Trim();
newRow["StudentID"] = dr["学号"].ToString().Trim();
newRow["School"] = schoolid == null ? 0 : schoolid.UID;
newRow["GradYear"] = dr["毕业年份"].ToString().Trim();
newRow["IdentityID"] = dr["身份证号"].ToString().Trim();
newDT.Rows.Add(newRow);
}
SqlBulkCopy sqlbulkcopy = new SqlBulkCopy(PubConstant.ConnectionString, SqlBulkCopyOptions.UseInternalTransaction);
sqlbulkcopy.DestinationTableName = "Sys_StuUser";//数据库中的表名
sqlbulkcopy.ColumnMappings.Add("Pwd", "Pwd");
sqlbulkcopy.ColumnMappings.Add("UserName", "UserName");
sqlbulkcopy.ColumnMappings.Add("Education", "Education");
sqlbulkcopy.ColumnMappings.Add("Major", "Major");
sqlbulkcopy.ColumnMappings.Add("StuOrigin", "StuOrigin");
sqlbulkcopy.ColumnMappings.Add("Gender", "Gender");
sqlbulkcopy.ColumnMappings.Add("Destination", "Destination");
sqlbulkcopy.ColumnMappings.Add("HomeTel", "HomeTel");
sqlbulkcopy.ColumnMappings.Add("Tel", "Tel");
sqlbulkcopy.ColumnMappings.Add("Emai", "Emai");
sqlbulkcopy.ColumnMappings.Add("StudentID", "StudentID");
sqlbulkcopy.ColumnMappings.Add("School", "School");
sqlbulkcopy.ColumnMappings.Add("GradYear", "GradYear");
sqlbulkcopy.ColumnMappings.Add("IdentityID", "IdentityID");
sqlbulkcopy.WriteToServer(newDT);
return Content("上传成功！");
}