SqlCommandBuilder实现大数据更新

/// <param name="table">准备更新的DataTable新数据</param>
/// <param name="TableName">对应要更新的数据库表名</param>
/// <param name="primaryKeyName">对应要更新的数据库表的主键名</param>
/// <param name="columnsName">对应要更新的列的列名集合</param>
/// <param name="limitColumns">需要在ＳＱＬ的ＷＨＥＲＥ条件中限定的条件字符串，可为空。</param>
/// <param name="onceUpdateNumber">每次往返处理的行数</param>
/// <returns>返回更新的行数</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();
// 如何把已经属于一个DataSet的DataTable加到另一个DataSet中解决方法
//对需要添加的datatabele进行复制后再添加。
//DataTable tableNew = new DataTable();
//tableNew = table.Copy();
//ds.Tables.Add(table);

int result = 0;
using (SqlConnection sqlconn = new SqlConnection(ConnectionString))
{
sqlconn.Open();

//使用加强读写锁事务
//SqlTransaction tran = sqlconn.BeginTransaction(IsolationLevel.ReadCommitted);
try
{
foreach (DataRow dr in table.Rows)
{
//所有行设为修改状态
dr.SetModified();
}
//为Adapter定位目标表
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];
////需要更新的列设置参数是,参数名为"@+列名"
//for (int i = 0; i < columnsName.Length; i++)
//{
//    //此处拼接要更新的列名及其参数值
//    columnsUpdateSql += ("[" + columnsName[i] + "]" + "=@" + columnsName[i] + ",");
//    paras[i] = new SqlParameter("@" + columnsName[i], columnsName[i]);
//}
//if (!string.IsNullOrEmpty(columnsUpdateSql))
//{
//    //此处去掉拼接处最后一个","
//    columnsUpdateSql = columnsUpdateSql.Remove(columnsUpdateSql.Length - 1);
//}
//此处生成where条件语句
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);
//每次往返处理的行数
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);