public static int cci_schema_info(CUBRIDConnection con, T_CCI_SCH_TYPE type, string class_name, string attr_name, char flag, ref T_CCI_ERROR err_buf)
 {
     return cci_schema_info(con.Conection, type, class_name, attr_name, flag, ref err_buf);
 }
 public static int cci_schema_info(CUBRIDConnection con, T_CCI_SCH_TYPE type, string class_name, string attr_name, char flag, ref T_CCI_ERROR err_buf)
 {
     return(cci_schema_info(con.Conection, type, class_name, attr_name, flag, ref err_buf));
 }
 public static extern int cci_schema_info(int conn_handle, T_CCI_SCH_TYPE type, string class_name, string attr_name, char flag, ref T_CCI_ERROR err_buf);
 public static extern int cci_schema_info(int conn_handle, T_CCI_SCH_TYPE type, string class_name, string attr_name, char flag, ref T_CCI_ERROR err_buf);