build field catalog for dynamic data objects

[Former Member]

Hi

Could you please tell me how to build a field catalog (ooops alv) for an internal table which is a dynamic data object.

TYPES: BEGIN OF t_addsubty,

subty TYPE subty,

pernr TYPE persno,

END OF t_addsubty.

TYPES: ty_addsubty type t_addsubty occurs 1.

i have data object using these

CREATE DATA dref3 TYPE (g_type1).

ASSIGN dref3->* TO <fs_dp>.

where g_type1 refers a data type which i defined in the program. g_type1 = ty_addsubty.

now <fs_dp> refers to an internal table.

now i want to build a field catalog for this internal table.

In my program <fs_dp> structure is not always the same. i.e now it is ty_addsubty but for some other conditions the structure is different.

please help me out.

regards

badri

[Former Member]

I guess, RTTI is what you are looking for. Hava e look at the ABAP Classes matching the pattern CL_ABAP_*DESCR.

You might use the Method DESCRIBE_BY_DATA_REF of Class CL_ABAP_TABLEDESCR to get an instance of this class. Then you might want to use the Instance Method GET_TABLE_LINE_TYPE to retrieve an according Instance of class CL_ABAP_STRUCTDESCR, which describes the elements of the structure of the internal table refenciated by "dref3". The Instance of CL_ABAP_STRUCTDESCR has an attribute called COMPONENTS, which you can use to build up your field catalogue.

Hope that helps...

--M0KE

[Former Member]

Hi mike

thank u for the reply

could u please send a sample code for this

regards

badri

[Former Member]

Here some piece of code, which shows how it works:

<SNIP>

type-pools:

abap.

DATA:

lr_tabledescr TYPE REF TO cl_abap_tabledescr,

lr_structdescr TYPE REF TO cl_abap_structdescr.

field-symbols:

<lw_component> type abap_compdescr_tab.

TYPES:

BEGIN OF t_addsubty,

subty TYPE subty,

pernr TYPE persno,

END OF t_addsubty.

TYPES:

ty_addsubty type t_addsubty occurs 1.

CREATE DATA dref3 TYPE (g_type1).

ASSIGN dref3->* TO <fs_dp>.

lr_tabledescr ?= cl_abap_tabledescr=>describe_by_data( <fs_dp> ).

assert condition lr_tabledescr is bound.

lr_structdescr ?= lr_tabledescr->get_table_line_type( ).

loop at lr_structdescr->components assigning <lw_component>.

* do whatever you want with the information about

* the components of the structure

endloop.

</SNIP>

Do not forget to reward points...

[Former Member]

Hi Mike

Thank u very much for the timely help.

It solved my problem.

Thanks and regards

Badri

[uwe_schieferstein]

Hello Badri

You may want to have a look at my Wiki posting

[Creating Flat and Complex Internal Tables Dynamically using RTTI|https://www.sdn.sap.com/irj/sdn/wiki?path=/display/snippets/creating%2bflat%2band%2bcomplex%2binternal%2btables%2bdynamically%2busing%2brtti]

and the thread mentioned therein: [Creation of table of table dynamically|;

Regards,

Uwe