How to get the field in table.

Question

hi Guru,
My Requirment is I hava table ZSample.
Field:
1.Name
2.Age
3.Class
4.Country.
Is it possible to get the field . Bye Coding.
And i want store it in a StringTable.
Regards
Vivekananthan.S

Answer 1

Hello,
You can use ABAP RTTS for that.
Follow the examplo below:
DATA: itab TYPE TABLE OF sflight.
DATA: ref_table        TYPE REF TO cl_abap_tabledescr,
      ref_struct        TYPE REF TO cl_abap_structdescr,
      fields_table     TYPE abap_compdescr_tab.
FIELD-SYMBOLS: <field> LIKE LINE OF fields_table.
ref_table  ?= cl_abap_tabledescr=>describe_by_data( itab ).
ref_struct ?= ref_tb->get_table_line_type( ).
fields_table[] = ref_struct->components.
LOOP AT fields_table ASSIGNING <field>.
  WRITE: / <field>-name.
ENDLOOP.
The reference variable to CL_ABAP_TABLEDESCR describes the table . You have to cast from CL_ABAP_TYPEDESCR in order to have the reference variable ref_tb accessing both CL_ABAP_TABLEDESCR and CL_ABAP_TYPEDESCR.
After this, you need to identify the line of this table, you do so using a reference for CL_ABAP_STRUCTDESCR. Again, cast is needed here CL_ABAPTYPEDESCR reference is
returned from GET_TABLE_LINE_TYPE( ) method. By this way you will have access to the
table where the fieldnames you need are described.
After that, you can use as a common internal table.
I've done this on WebAS 6.20, maybe in SAP 4.6 (and below) these classes won't be available.
Also, there's an eLearning on SDN about generic programming.
Regards,
Eduardo