DataSet更新失败

Question

我正在尝试更新修改后的数据集，如下所示。我收到了错误。我该如何纠正这个问题？

未处理的类型＆＃39; System.InvalidOperationException＆＃39;发生在System.Data.dll中 其他信息：更新无法找到TableMapping [＆＃39;表＆＃39;]或DataTable＆＃39;表＆＃39;。

string strAccessConn = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=C:\\Program Files\\ASWorx Products\\ASWorx200\\Database\\GemDatabase.mdb";
string strAccessSelect = "SELECT * FROM VariableTable";

// Create the dataset and add the Categories table to it:
DataSet myDataSet = new DataSet();
OleDbConnection myAccessConn = new OleDbConnection(strAccessConn);            
OleDbCommand myAccessCommand = new OleDbCommand(strAccessSelect, myAccessConn);
OleDbDataAdapter myDataAdapter = new OleDbDataAdapter(myAccessCommand);
myAccessConn.Open();
myDataAdapter.Fill(myDataSet, "VariableTable");

DataRowCollection dra = myDataSet.Tables["VariableTable"].Rows;
foreach (DataRow dr in dra)
{
    dr[1] = "SV";
    break;
}
myDataAdapter.Update(myDataSet);

Answer 1

您需要使用OleDbCommandBuilder对象 - 它会生成单表命令。

OleDbCommand myAccessCommand = new OleDbCommand(strAccessSelect, myAccessConn);
OleDbDataAdapter myDataAdapter = new OleDbDataAdapter(myAccessCommand);
OleDbCommandBuilder cmd=new OleDbCommandBuilder(myDataAdapter);

myDataAdapter.Fill(myDataSet, "VariableTable");
..

更新数据集结果，

myDataAdapter.Update(myDataSet,"VariableTable");