c# - 使用对 DataTable 所做的更改更新数据库...混乱

Question

DataAdapter.Fill(DataTable);如果我用这样的简单方法填充 DataTable，然后对 DataTable 中的一行进行更改：DataTable.Rows[0]["Name"] = "New Name";如何轻松地将这些更改保存回数据库？我以为我可以打电话DataAdapter.Update(DataTable);，但我读到它只适用于 TableAdapter(?)。

Answer 1

这是一个实际有用的答案，以防其他人需要知道如何执行此操作：

string selectStatement = "SELECT * FROM Contact";
System.Data.DataTable dt = new System.Data.DataTable();
SqlConnection conn = new SqlConnection(System.Configuration.ConfigurationManager.ConnectionStrings["MyConnectionString"].ConnectionString);
conn.Open();
SqlDataAdapter sqlDa = new SqlDataAdapter();
sqlDa.SelectCommand = new SqlCommand(selectStatement, conn);
SqlCommandBuilder cb = new SqlCommandBuilder(sqlDa);
sqlDa.Fill(dt);
dt.Rows[0]["Name"] = "Some new data here";
sqlDa.UpdateCommand = cb.GetUpdateCommand();
sqlDa.Update(dt);

Answer 2

请注意 SqlBulkCopyOptions.KeepIdentity ，您可能希望也可能不希望在您的情况下使用它。

using (var bulkCopy = new SqlBulkCopy(_connection.ConnectionString, SqlBulkCopyOptions.KeepIdentity))
{
      // my DataTable column names match my SQL Column names, so I simply made this loop. However if your column names don't match, just pass in which datatable name matches the SQL column name in Column Mappings
      foreach (DataColumn col in table.Columns)
      {
          bulkCopy.ColumnMappings.Add(col.ColumnName, col.ColumnName);
      }
      bulkCopy.BulkCopyTimeout = 600;
      bulkCopy.DestinationTableName = destinationTableName;
      bulkCopy.WriteToServer(table);
}