Refresh Oracle table

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Using the code below, I add columns:

public void AlterTable_AddColumn(OracleConnection connection, string tblName, string colName)  {
    DataTable table = GetOracleDataTable(connection, "select * from ", tblName);
    DataColumnCollection columns = table.Columns;

    if (!columns.Contains(colName))    {
        string s = "Alter table " + tblName.ToUpper() + " Add ( " + colName + " VARCHAR2(500) ) ";
        using (OracleCommand cmd = new OracleCommand(s, connection))  {
            cmd.ExecuteNonQuery();
        }
    }
    connection.Close();
}

After adding 1 new column (termed Column1 here), the code iterated for adding another column (Column2). In this step, I viewed variable: columns, which listed all of the column names except for Column1 that was just added. In order to refresh the table with all of the updated columns/rows information, how can the table be refreshed? In this piece of code, I erloaded the datatable after inserting a new column (see DataTable table = ...). I also tried connection.Close() and then connection.Open(), but not effective. Will be glad to listen to your advisory for the solution. Thanks.

Posted 30-Jun-14 5:13am

Member 10454592

Updated 30-Jun-14 8:50am

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Member 10454592 · Answer 1 · 2014-06-30T10:18:00

I revised the code as below:

C#

public void AlterTable_AddColumn(OracleConnection connection, DataTable tbl, string colName)   {
    //DataTable table = GetOracleDataTable(connection, "select * from ", tblName);
    DataColumnCollection columns = tbl.Columns;  // table.Columns;

    if (!columns.Contains(colName))    {
        string s = "Alter table " + tbl.TableName.ToUpper() + " Add ( " + colName + " VARCHAR2(500) ) ";
        using (OracleCommand cmd = new OracleCommand(s, connection))    {
            cmd.ExecuteNonQuery();
            //System.Windows.Forms.MessageBox.Show("Table altered");
        }
        tbl.Columns.Add(colName, typeof(string));
        tbl.ColumnChanged += new DataColumnChangeEventHandler(Column_Changed);
        tbl.AcceptChanges();
    }
    connection.Close();
}
private static void Column_Changed(object sender, DataColumnChangeEventArgs e)   {
}    // useless

Then, the bug is solved. However, I actually did on both Oracle's insert and datatable update. I know it somehow redundant. If you have a betgter idea, please share. Thanks.