DataTable数据批量写入数据库三种方法比较

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。

1. SqlConnection sqlconnection = new SqlConnection(connectionString);
2. SqlDataAdapter sqldataadapter = new SqlDataAdapter("select * from Table_1 where 1=2", sqlconnection);
3. DataSet dataset = new DataSet();
4. sqldataadapter.Fill(dataset, "Table_1");
5. DataTable datatable = dataset.Tables[0];
6. //生成20000条记录
7. for (int i = 0; i < 20000; i++)
8. {
9.       DataRow datarow = datatable.NewRow();
10.       datarow["CompanyName"] = "companyname"+string.Format("{0:0000}",i);
11.       datarow["CompanyCode"] = "companycode" + string.Format("{0:0000}", i);
12.       datarow["Address"] = "address" + string.Format("{0:0000}", i);
13.       datarow["Owner"] = "owner" + string.Format("{0:0000}", i);
14.       datarow["Memo"] = "memo" + string.Format("{0:0000}", i);
15.       datatable.Rows.Add(datarow);
16. }

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2、使用sqlcommand.executenonquery()方法插入

1. foreach (DataRow datarow in datatable.Rows)
2. {
3. string sql = "INSERT INTO [Table_1]([CompanyName],[CompanyCode],[Address],[Owner],
4. )" +
5. "VALUES('" + datarow["CompanyName"].ToString() + "'" +
6. ",'" + datarow["CompanyCode"].ToString() + "'" +
7. ",'" + datarow["Address"].ToString() + "'" +
8. ",'" + datarow["Owner"].ToString() + "'" +
9. ",'" + datarow["Memo"].ToString() + "')";
10.    using (SqlConnection sqlconn = new SqlConnection(connectionString))
11.    {
12.    sqlconn.Open();    SqlCommand sqlcommand = new SqlCommand(sql, sqlconn);
13.    sqlcommand.ExecuteNonQuery();
14.    sqlconn.Close();
15.    }
16. }

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插入20000条记录时间:00:00:29.7336000

3、使用sqldataadapter.update(dataset,tablename);

1. SqlCommand insertcommand = new SqlCommand("INSERT INTO [Table_1]([CompanyName],[CompanyCode],[Address],[Owner],
2. )" +
3. "VALUES(@CompanyName, @CompanyCode,@Address,@Owner,@Memo)",new SqlConnection(connectionString));
4. insertcommand.Parameters.Add("@CompanyName", SqlDbType.NChar, 50, "CompanyName");
5. insertcommand.Parameters.Add("@CompanyCode", SqlDbType.NChar, 25, "CompanyCode");
6. insertcommand.Parameters.Add("@Address", SqlDbType.NChar, 255, "Address");
7. insertcommand.Parameters.Add("@Owner", SqlDbType.NChar, 25, "Owner");
8. insertcommand.Parameters.Add("@Memo", SqlDbType.NChar, 255, "Memo");
9. sqldataadapter.InsertCommand = insertcommand;
10. 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)

1. SqlBulkCopy sqlbulkcopy = new SqlBulkCopy(connectionString, SqlBulkCopyOptions.UseInternalTransaction);
2. sqlbulkcopy.DestinationTableName = "Table_1";//数据库中的表名
3. 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。