#491 [ODBC] OdbcDataReader.GetDataTypeName doesn't work

[Jira Trac]

* Brief:
** The OdbcDataReader.GetDataTypeName doesn't work properly, it always return null value

* Test Code:
{noformat}

[Test, Description(Test for DdbcDataReader GetDataTypeName Method)]
public void OdbcDataReaderMethod_GetDataTypeName()
{
// Open Connection
string strConn = @Driver={CUBRID Driver};db_name=odbc_test;uid=dba;pwd=;server=10.34.64.57;port=33037;fetch_size=100;
OdbcConnection connCubrid = new OdbcConnection(strConn);
connCubrid.Open();

// Create a test table with 4 columns in various data type
string testTable = table_data_type;
string strDropTable = string.Format(DROP TABLE {0}, testTable);
string strCreateTable = string.Format(@CREATE TABLE {0}(id INT NOT NULL AUTO_INCREMENT PRIMARY KEY,
col_1 INT, col_2 VARCHAR, col_3 CHAR), testTable);
string strSqlInsert = string.Format(INSERT INTO {0}(col_1, col_2, col_3) VALUE(123, 'varchar contents', 'a'), testTable);

// Execute multiple queries
ExecuteMultiQueries(connCubrid, new string[] {strDropTable, strCreateTable, strSqlInsert});

string strSqlSelect = string.Format(SELECT * FROM {0} ORDER BY id DESC;, testTable);
OdbcDataReader odbcReader = CreateReader(connCubrid, strSqlSelect);

// Check for GetDataTypeName returned values
Assert.AreEqual(INT, odbcReader.GetDataTypeName(0));
Assert.AreEqual(INT, odbcReader.GetDataTypeName(1));
Assert.AreEqual(VARCHAR, odbcReader.GetDataTypeName(2));
Assert.AreEqual(CHAR, odbcReader.GetDataTypeName(3));
connCubrid.Close();
}

private OdbcDataReader CreateReader(OdbcConnection conn, string query)
{
OdbcCommand command = new OdbcCommand();
command.Connection = conn;
command.CommandText = query;
OdbcDataReader odbcReader = command.ExecuteReader();
odbcReader.Read();
return odbcReader;
}

private void ExecuteMultiQueries(OdbcConnection conn, string[] multiQueries)
{
OdbcCommand command = new OdbcCommand();
command.Connection = conn;
foreach (string query in multiQueries)
{
try
{
command.CommandText = query;
command.ExecuteNonQuery();
}
catch (Exception e)
{
Console.WriteLine(e.Message);
}
}
command.Dispose();
}

{noformat}

* Result:
** Expected Results: INT, INT, VARCHAR, CHAR
** Real Results: null, null, null. null