批量更新 sql

   批量更新Card數據

  1, 首先建立數據庫連接

  2  把部分數據填充到Dataset中

 3 修改Dataset中數據的值

 4 更新Dataset

 5 循環操作,具體操作過程見下面代碼

  public void BatchUpdate(List<Card> list)
        {
            using (SqlConnection conn = new SqlConnection(DbHelperSQL.connectionString))
            {
                conn.Open();
                using (SqlDataAdapter da = new SqlDataAdapter())
                {
                    da.SelectCommand = new SqlCommand("select top 100 ScanFlag,CardId from Card",conn);
                    DataSet ds = new DataSet();
                    da.Fill(ds);
 
                    da.UpdateCommand = new SqlCommand("update Card set ScanFlag = @ScanFlag where CardId = @CardId", conn);
                    da.UpdateCommand.Parameters.Add("@ScanFlag", SqlDbType.Bit, 1, "ScanFlag");
                    da.UpdateCommand.Parameters.Add("@CardId", SqlDbType.Int, 4, "CardId");
                    da.UpdateCommand.UpdatedRowSource = UpdateRowSource.None;
                    da.UpdateBatchSize = 0;
 
                    for (int i = 0; i < list.Count; i++)
                    {
                        for (int j = 0; j < ds.Tables[0].Rows.Count; j++, i++)
                        {
                            ds.Tables[0].Rows[j].BeginEdit();
                            ds.Tables[0].Rows[j]["ScanFlag"] = true;
                            ds.Tables[0].Rows[j]["CardId"] = list[i].CardId;
                            ds.Tables[0].Rows[j].EndEdit();
                            if (i == list.Count - 1)
                                break;
                        }
                        da.Update(ds.Tables[0]);
                    }
                    ds.Clear();
                    ds.Dispose();
                }
            }
        }