我的代码中有这样的东西（.Net 2.0，MS SQL）
SqlConnection connection = new SqlConnection(@"Data Source=localhost;Initial
Catalog=DataBase;Integrated Security=True");
connection.Open();
SqlCommand cmdInsert = connection.CreateCommand();
SqlTransaction sqlTran = connection.BeginTransaction();
cmdInsert.Transaction = sqlTran;
cmdInsert.CommandText =
@"INSERT INTO MyDestinationTable" +
"(Year, Month, Day, Hour, ...) " +
"VALUES " +
"(@Year, @Month, @Day, @Hour, ...) ";
cmdInsert.Parameters.Add("@Year", SqlDbType.SmallInt);
cmdInsert.Parameters.Add("@Month", SqlDbType.TinyInt);
cmdInsert.Parameters.Add("@Day", SqlDbType.TinyInt);
// more fields here
cmdInsert.Prepare();
Stream stream = new FileStream(fileName, FileMode.Open, FileAccess.Read);
StreamReader reader = new StreamReader(stream);
char[] delimeter = new char[] { };
String[] records;
while (!reader.EndOfStream)
{
records = reader.ReadLine().Split(delimeter, StringSplitOptions.None);
cmdInsert.Parameters["@Year"].Value = Int32.Parse(records[0].Substring(0, 4));
cmdInsert.Parameters["@Month"].Value = Int32.Parse(records[0].Substring(5, 2));
cmdInsert.Parameters["@Day"].Value = Int32.Parse(records[0].Substring(8, 2));
// more here complicated stuff here
cmdInsert.ExecuteNonQuery()
}
sqlTran.Commit();
connection.Close();
使用cmdInsert.ExecuteNonQuery（）注释，此代码在不到2秒的时间内执行。使用SQL执行需要1米20秒。大约有50万条记录。桌子之前是空的。具有类似功能的SSIS数据流任务大约需要20秒。
- Bulk Insert was not an option (see below). I did some fancy stuff during this import.
- My test machine is Core 2 Duo with 2 GB RAM.
- When looking in Task Manager CPU was not fully untilized. IO seemed also not to be fully utilized.
- Schema is simple like hell: one table with AutoInt as primary index and less than 10 ints, tiny ints and chars(10).
在这里回答了一些问题后，我发现可以从内存执行大容量复制！我拒绝使用批量复制，因为我认为它必须从文件中完成。。。
现在我使用它，它大约需要20秒（就像SSIS任务一样）
DataTable dataTable = new DataTable();
dataTable.Columns.Add(new DataColumn("ixMyIndex", System.Type.GetType("System.Int32")));
dataTable.Columns.Add(new DataColumn("Year", System.Type.GetType("System.Int32")));
dataTable.Columns.Add(new DataColumn("Month", System.Type.GetType("System.Int32")));
dataTable.Columns.Add(new DataColumn("Day", System.Type.GetType("System.Int32")));
// ... and more to go
DataRow dataRow;
object[] objectRow = new object[dataTable.Columns.Count];
Stream stream = new FileStream(fileName, FileMode.Open, FileAccess.Read);
StreamReader reader = new StreamReader(stream);
char[] delimeter = new char[] { };
String[] records;
int recordCount = 0;
while (!reader.EndOfStream)
{
records = reader.ReadLine().Split(delimeter, StringSplitOptions.None);
dataRow = dataTable.NewRow();
objectRow[0] = null;
objectRow[1] = Int32.Parse(records[0].Substring(0, 4));
objectRow[2] = Int32.Parse(records[0].Substring(5, 2));
objectRow[3] = Int32.Parse(records[0].Substring(8, 2));
// my fancy stuf goes here
dataRow.ItemArray = objectRow;
dataTable.Rows.Add(dataRow);
recordCount++;
}
SqlBulkCopy bulkTask = new SqlBulkCopy(connection, SqlBulkCopyOptions.TableLock, null);
bulkTask.DestinationTableName = "MyDestinationTable";
bulkTask.BatchSize = dataTable.Rows.Count;
bulkTask.WriteToServer(dataTable);
bulkTask.Close();