[help]how to know whether the given column exists in the table or not????

Question

Hi all, can anyone tell me how to write a C# code help me to know whether the given field exists.
If it doesnt exists then i want to alter the table to include this column also
I am able to write the code for alter table but i m not sure how do i check for its existence/nonexistence
My Altering code
{color:#800000}cmd.CommandText = "alter table " + row.ToString() + " add(" + sQuality + " varchar2(50), " +
sTimeStamp + " varchar2(50), " +
sValue + " varchar2(50))";
cmd.CommandType = CommandType.Text;
cmd.ExecuteReader();
{color}

Answer 1

Just iterate the datatable after completion and check for your column.
        public static DataTable MaterializeTableStructure(string _connectionString, string _tableName)
            DataSet ds = null;
            using (OracleConnection _oraconn = new OracleConnection(_connectionString))
                try
                    _oraconn.Open();
                    string sql = "SELECT COLUMN_NAME, DATA_TYPE, NULLABLE, DATA_LENGTH, DATA_PRECISION, DATA_SCALE FROM user_tab_columns where table_name='" + _tableName + "'";
                    using (OracleCommand cmd = new OracleCommand(sql, _oraconn))
                        cmd.CommandType = CommandType.Text;
                        using (OracleDataAdapter da = new OracleDataAdapter(cmd))
                            ds = new DataSet("MaterializeTableStructure");
                            da.Fill(ds);
                catch (OracleException _oraEx)
                    throw (_oraEx); // Actually rethrow
                catch (System.Exception _sysEx)
                    throw (_sysEx); // Actually rethrow
                finally
                    if (_oraconn.State == ConnectionState.Broken || _oraconn.State == ConnectionState.Open)
                        _oraconn.Close();
            if (ds != null)
                return ds.Tables[0];
            else
                return null;
        }r,
dennis