DataAdapter.Update giving an extra column

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Hello all.

I'm using the ODBC Microsoft Text Driver to load a csv file into the dataset to be displayed in the datagridview, the DGV has no columns in at present. I can load the file successfully but I encounter 2 problems:

a) The 2 columns load fine but a third 'noname' column is also loaded - why does this happen?

b) When I do an update using a DataAdapter, I get this exception:

"ERROR [HYS22] [Microsoft][ODBC Text Driver] The INSERT INTO statement contains the following unknown field name: 'NoName'.  Make sure you have typed the name correctly, and try the operation again."

Does anybody know why this occurs?

Many thanks,
Charles

*** Code below ***

void RefreshData()
      {
          OdbcConnection conn = new OdbcConnection(@"Driver={Microsoft Text Driver (*.txt; *.csv)};Dbq=c:\;");

          OdbcCommand comm = new OdbcCommand("Select * FROM test.csv", conn);
          OdbcDataAdapter adapter = new OdbcDataAdapter(comm);
          DataSet ds = new DataSet();
          adapter.Fill(ds);
         // ds.Tables[0].Columns.Remove("noname");
          dataGridView1.DataSource = ds.Tables[0];
      }

      private void button1_Click(object sender, EventArgs e)
      {
          OdbcConnection conn = new OdbcConnection(@"Driver={Microsoft Text Driver (*.txt; *.csv)};Dbq=c:\;");
          string qry = "Select * FROM test.csv";
          OdbcDataAdapter da = new OdbcDataAdapter();
          da.SelectCommand = new OdbcCommand(qry, conn);

          OdbcCommandBuilder cb = new OdbcCommandBuilder(da);

          DataSet ds = new DataSet();
          da.Fill(ds);

          //ds.Tables[0].Columns.Remove("noname");

          DataTable dt = ds.Tables[0];

          // Add a row
          DataRow newRow = dt.NewRow();
          newRow[0] = this.textBox1.Text;
          newRow[1] = int.Parse(this.textBox2.Text); ;
          dt.Rows.Add(newRow);

          da.Update(ds.Tables[0]);

          conn.Close();

          this.Refresh();

*** csv Data ***
empName,salary,
charles,4324343,
andrew,31343970,
freddy,998788966,
loop,8878743,

Posted 11-May-11 22:16pm

Sokka_sta

Updated 11-May-11 22:37pm

Prerak Patel

v3

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2 solutions

Solution 2

here is your modifed update statement

C++

da.Update(ds.Tables[0].DefaultView.ToTable(true, new string[] { "empName", "salary" }));

try with this....

Posted 11-May-11 23:01pm

Ashishmau

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Wayne Gaylard · Accepted Answer · 2011-05-11T22:56:00

When it comes to SQL queries you should never use SELECT * FROM test.csv, rather name the columns you want to extract by name. Thus if you do this

C#

void RefreshData()
        {
            OdbcConnection conn = new OdbcConnection(@"Driver={Microsoft Text Driver (*.txt; *.csv)};Dbq=C:\;");
            //Get specific columns
            OdbcCommand comm = new OdbcCommand("Select empName, salary FROM test.csv", conn);
            OdbcDataAdapter adapter = new OdbcDataAdapter(comm);
            DataSet ds = new DataSet();
            adapter.Fill(ds);
            dataGridView1.DataSource = ds.Tables[0];
        }

then you should be OK.

Hope this helps