IT工程師數位筆記本

        /// <param name="table">準備更新的DataTable新數據</param>
        /// <param name="TableName">對應要更新的數據庫表名</param>
        /// <param name="primaryKeyName">對應要更新的數據庫表的主鍵名</param>
        /// <param name="columnsName">對應要更新的列的列名集合</param>
        /// <param name="limitColumns">需要在ＳＱＬ的ＷＨＥＲＥ條件中限定的條件字符串，可為空。</param>
        /// <param name="onceUpdateNumber">每次往返處理的行數</param>
        /// <returns>返回更新的行數</returns>
        public static int Update(DataTable table, string TableName, string primaryKeyName, string[] columnsName, int onceUpdateNumber)
        {
            if (string.IsNullOrEmpty(TableName)) return 0;
            if (string.IsNullOrEmpty(primaryKeyName)) return 0;
            if (columnsName == null || columnsName.Length <= 0) return 0;
           
            //DataSet ds = new DataSet();
           // 如何把已經屬于一個DataSet的DataTable加到另一個DataSet中解決方法
            //對需要添加的datatabele進行復制后再添加。
            //DataTable tableNew = new DataTable();
            //tableNew = table.Copy();
            //ds.Tables.Add(table);
           
            int result = 0;
            using (SqlConnection sqlconn = new SqlConnection(ConnectionString))
            {
                sqlconn.Open();

                //使用加強讀寫鎖事務  
                //SqlTransaction tran = sqlconn.BeginTransaction(IsolationLevel.ReadCommitted);
                try
                {
                    foreach (DataRow dr in table.Rows)
                    {
                        //所有行設為修改狀態  
                        dr.SetModified();
                    }
                    //為Adapter定位目標表  
                    SqlCommand cmd = new SqlCommand(string.Format("select Name,Pwd from {0}", TableName), sqlconn);
                    SqlDataAdapter da = new SqlDataAdapter(cmd);
                    SqlCommandBuilder sqlCmdBuilder = new SqlCommandBuilder(da);
                    da.AcceptChangesDuringUpdate = false;
                    string columnsUpdateSql = "";
                    //SqlParameter[] paras = new SqlParameter[columnsName.Length];
                    ////需要更新的列設置參數是,參數名為"@+列名"
                    //for (int i = 0; i < columnsName.Length; i++)
                    //{
                    //    //此處拼接要更新的列名及其參數值
                    //    columnsUpdateSql += ("[" + columnsName[i] + "]" + "=@" + columnsName[i] + ",");
                    //    paras[i] = new SqlParameter("@" + columnsName[i], columnsName[i]);
                    //}
                    //if (!string.IsNullOrEmpty(columnsUpdateSql))
                    //{
                    //    //此處去掉拼接處最后一個","
                    //    columnsUpdateSql = columnsUpdateSql.Remove(columnsUpdateSql.Length - 1);
                    //}
                    //此處生成where條件語句
                    string limitSql = ("[" + primaryKeyName + "]" + "=@" + primaryKeyName);
                    string sql = "Update T_SQLTable  SET Name=@Name,Pwd=@Pwd where ID=@ID";
                    SqlCommand updateCmd = new SqlCommand(sql);
                    //不修改源DataTable  
                    updateCmd.UpdatedRowSource = UpdateRowSource.None;
                    da.UpdateCommand = updateCmd;
                    da.UpdateCommand.Parameters.Add("@Name",SqlDbType.NVarChar,100,"Name");
                    da.UpdateCommand.Parameters.Add("@Pwd", SqlDbType.NVarChar, 100,"Pwd");
                    da.UpdateCommand.Parameters.Add("@ID", SqlDbType.Int, 100, "ID");

                    //da.UpdateCommand.Parameters.AddWithValue("@" + primaryKeyName, primaryKeyName);
                    //每次往返處理的行數
                    da.UpdateBatchSize = onceUpdateNumber;


                   
                    result = da.Update(table);
                    table.AcceptChanges();
                    //tran.Commit();

                }
                catch
                {
                    //tran.Rollback();
                }
                finally
                {
                    sqlconn.Dispose();
                    sqlconn.Close();
                }


            }
            return result;
        }

  DAL.DBHelper db=new DAL.DBHelper();
           DataTable Oletable= db.GetDataTable("select * from T_SQLDB");
           DAL.DBHelper.Update(Oletable, "T_SQLTable", "ID", new string[] { "Name", "Pwd" }, 5000);