将DataTable中所做的更改更新到数据库...混淆

Question

如果我使用DataAdapter.Fill(DataTable);填充一个DataTable，然后对其中一行进行更改，比如这样简单的操作：DataTable.Rows[0]["Name"] = "New Name";，那么如何轻松将这些更改保存回数据库呢？我认为可以调用DataAdapter.Update(DataTable);，但我读到只有TableAdapter才能这样做。

- Jimmy D

Answer 1

以下是一个实际有用的答案，以防其他人需要知道如何做到这一点：

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);

- Jimmy D

---

@blackholeearth0_gmail 看起来它返回一个UPDATE命令，反映了在将dt.Rows[0]["Name"] = "Some new data here"值分配给行时所做的更改。 - infografnet

Answer 2

请注意SqlBulkCopyOptions.KeepIdentity，根据您的情况可能需要或不需要使用。

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);
}

- Syed Fahad Ali