DataTable数据批量写入数据库三种方法比较
标签： it 分类： C#
1)   insert循环插入；
2)   sqldataadapter.update(dataset,tablename);
3)   sqlbulkcopy.WriteToServer(datatable);

1、生成测试的datatable表，表结构如下：
UniqueID(主键，自动增长)   |   CompanyName   |   CompanyCode   |   Address   |   Owner   |   Memo
共6个字段。
SqlConnection sqlconnection = new SqlConnection(connectionString);
SqlDataAdapter sqldataadapter = new SqlDataAdapter("select * from Table_1 where 1=2", sqlconnection);
DataSet dataset = new DataSet();
sqldataadapter.Fill(dataset, "Table_1");
DataTable datatable = dataset.Tables[0];
//生成20000条记录
for (int i = 0; i < 20000; i++)
{
      DataRow datarow = datatable.NewRow();
      datarow["CompanyName"] = "companyname"+string.Format("{0:0000}",i);
      datarow["CompanyCode"] = "companycode" + string.Format("{0:0000}", i);
      datarow["Address"] = "address" + string.Format("{0:0000}", i);
      datarow["Owner"] = "owner" + string.Format("{0:0000}", i);
      datarow["Memo"] = "memo" + string.Format("{0:0000}", i);
      datatable.Rows.Add(datarow);
}
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2、使用sqlcommand.executenonquery()方法插入
foreach (DataRow datarow in datatable.Rows)
{
string sql = "INSERT INTO [Table_1]([CompanyName],[CompanyCode],[Address],[Owner],
)" +
"VALUES('" + datarow["CompanyName"].ToString() + "'" +
",'" + datarow["CompanyCode"].ToString() + "'" +
",'" + datarow["Address"].ToString() + "'" +
",'" + datarow["Owner"].ToString() + "'" +
",'" + datarow["Memo"].ToString() + "')";
   using (SqlConnection sqlconn = new SqlConnection(connectionString))
   {
   sqlconn.Open();    SqlCommand sqlcommand = new SqlCommand(sql, sqlconn);
   sqlcommand.ExecuteNonQuery();
   sqlconn.Close();
   }
}
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插入20000条记录时间:00:00:29.7336000

3、使用sqldataadapter.update(dataset,tablename);
SqlCommand insertcommand = new SqlCommand("INSERT INTO [Table_1]([CompanyName],[CompanyCode],[Address],[Owner],
)" +
"VALUES(@CompanyName, @CompanyCode,@Address,@Owner,@Memo)",new SqlConnection(connectionString));
insertcommand.Parameters.Add("@CompanyName", SqlDbType.NChar, 50, "CompanyName");
insertcommand.Parameters.Add("@CompanyCode", SqlDbType.NChar, 25, "CompanyCode");
insertcommand.Parameters.Add("@Address", SqlDbType.NChar, 255, "Address");
insertcommand.Parameters.Add("@Owner", SqlDbType.NChar, 25, "Owner");
insertcommand.Parameters.Add("@Memo", SqlDbType.NChar, 255, "Memo");
sqldataadapter.InsertCommand = insertcommand;
sqldataadapter.Update(dataset, "Table_1");
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插入20000条记录时间:00:00:22.8938000

4、使用sqlbulkcopy.writetoserver(datatable)
SqlBulkCopy sqlbulkcopy = new SqlBulkCopy(connectionString, SqlBulkCopyOptions.UseInternalTransaction);
sqlbulkcopy.DestinationTableName = "Table_1";//数据库中的表名
sqlbulkcopy.WriteToServer(dataset.Tables[0]);
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插入20000条记录时间:00:00:00.3276000

所以说速度是sqlbulkcopy最快，sqldataadapter.update()次之，sqlcommand.ExecuteNonQuery()最慢。