如何使用DataSet而不是DataReader

Question

dconnetion = New OdbcConnection(lsconnectionstring)
        dconnetion.Open()
        mssql = "select cust_id,cust_name,cust_address,cust_contact_no from cust_details where cust_id in (select cust_id from cust_details)"
        cmd.Connection = dconnetion
        cmd.CommandText = mssql
        cmd.CommandType = CommandType.Text
        dr = cmd.ExecuteReader

我使用此语句使用DataReader从数据库中读取数据。

问题在于，当我使用DataSet而不是DataReader时，查询是什么？

Answer 1

使用DataAdapter.Fill()方法使用相同的查询。

dconnetion = new OdbcConnection(lsconnectionstring);
//dconnetion.Open()
mssql = "select cust_id,cust_name,cust_address,cust_contact_no from cust_details where cust_id in (select cust_id from cust_details)";
cmd.Connection = dconnetion;
cmd.CommandText = mssql;
cmd.CommandType = CommandType.Text;

using (OdbcDataAdapter da = new OdbcDataAdapter(cmd)) 
{
   DataSet ds = new DataSet();
   dconnetion.Open();
   da.Fill(ds);
   dconnetion.Close(); 
}