Creating Work Area in OO

Question

Hi,
I have a table type, which uses Line Type of a structure.
I want to declare a table for that and also a work area. I need to append entries in this table l_i_tab_ca_rbl_data.
I declared the table as follows :-
l_i_tab_ca_rbl_data TYPE standard TABLE OF cms_tab_am_cur_acc_rbl_data,
and I tried to declare the Work area in the following ways :-
ls_i_tab_ca_rbl_data like l_i_tab_ca_rbl_data,
ls_i_tab_ca_rbl_data type cms_tab_am_cur_acc_rbl_data,
ls_i_tab_ca_rbl_data type cms_str_am_cur_acc_rbl_data ("This is the line type used in the table type )
In the first case, it says "ls_i_tab_ca_rbl_data  does not have a header line"
It gives the error "ls_i_tab_ca_rbl_data cannot be converted to line type of l_i_tab_ca_rbl_data".
Please suggest how I can declare a wrok area for this table type.
Also since the error says that l_i_tab_ca_rbl_data is a line type does that mean it can hold only one record.
Also is there any other way to append entries in that table l_i_tab_ca_rbl_data, apart from work areas.
Please help.
Note : I am working in a class-> method so am unable to declare tables with header line.
Thanks in advance,
Archana

Answer 1

It's actually simple if yyou use dynamic tables and field symbols.
In the program that calls  methods / attributes in the class
define some field symbols
for example
FIELD-SYMBOLS :
  <fs1>           TYPE  ANY,
  <fs2>           TYPE  STANDARD TABLE,
  <field_catalog> TYPE STANDARD TABLE,
  <dyn_table>    TYPE  STANDARD TABLE,
  <orig_table>   TYPE  STANDARD TABLE,
  <dyn_field>,
  <dyn_wa>.
in the class define data
DATA:
dy_table         TYPE REF TO data,
    dy_line          TYPE REF TO data,
etc.
field symbols work both INSIDE and OUTSIDE classes and are extremely useful for passing / receiving data. You have to define the field symbols in your main program however.
METHOD create_dynamic_table.
CALL METHOD cl_alv_table_create=>create_dynamic_table
    EXPORTING
         it_fieldcatalog = it_fldcat
      IMPORTING
         ep_table = dy_table.
ENDMETHOD.
CALL METHOD me->create_dynamic_table
    EXPORTING
      it_fldcat = it_fldcat
    IMPORTING
      dy_table        = dy_table.
     ASSIGN dy_table->* TO <dyn_table>.
CREATE DATA dy_line LIKE LINE OF <dyn_table>.
ASSIGN dy_line->* TO <dyn_wa>.
ENDMETHOD.
Then in your program (or class)  your data is in <dyn_table>.
Use dynamic tables and dynamic field cats as these give HUGE flexibility and you can re-use code over and over again for different structures.
The new RTTI  gives you any table structure whatsoever so you can make the whole thing completely general.
That's one of the advantages of Classes and OO as opposed to older FMODS.
Cheers
jimbo