FM DB_GET_TABLE_FIELDS

Question

Use the FM DB_GET_TABLE_FIELDS for this purpose.
Pass the table name in TABNAME parameter and it will return a table (thru the TABLES parameter) which u can capture in an internal table with structure DBFIELD.
Someone provide me this fm, but i dont know hw to delcare the internal table for the DBFIELD?
Code to declare the internal table pls.

Answer 1

Use the FM DB_GET_TABLE_FIELDS for this purpose.
Pass the table name in TABNAME parameter and it will return a table (thru the TABLES parameter) which u can capture in an internal table with structure DBFIELD.
Check the code below:
REPORT ZYKTEST3 .
DATA: d_ref TYPE REF TO data,
d_ref2 TYPE REF TO data,
i_alv_cat TYPE TABLE OF lvc_s_fcat,
ls_alv_cat LIKE LINE OF i_alv_cat.
TYPES: tabname LIKE dcobjdef-name ,
fieldname LIKE dcobjdef-name,
desc LIKE dntab-fieldtext.
PARAMETER: p_tablen TYPE tabname. -
> Input table field
DATA: BEGIN OF itab OCCURS 0.
INCLUDE STRUCTURE dntab.
DATA: END OF itab.
FIELD-SYMBOLS : <f_fs> TYPE table,
<f_fs1> TYPE table,
<f_fs2> TYPE ANY,
<f_fs3> TYPE ANY,
<f_fs4> type any,
<f_field> TYPE ANY.
REFRESH itab.
CALL FUNCTION 'NAMETAB_GET' -
> Fetches the fields
EXPORTING
langu = sy-langu
tabname = p_tablen
TABLES
nametab = itab
EXCEPTIONS
no_texts_found = 1.
LOOP AT itab .
ls_alv_cat-fieldname = itab-fieldname.
ls_alv_cat-ref_table = p_tablen.
ls_alv_cat-ref_field = itab-fieldname.
ls_alv_cat-seltext = itab-fieldtext.
ls_alv_cat-reptext = itab-fieldtext.
APPEND ls_alv_cat TO i_alv_cat.
ENDLOOP.
internal table build
CALL METHOD cl_alv_table_create=>create_dynamic_table
EXPORTING
it_fieldcatalog = i_alv_cat
IMPORTING
ep_table = d_ref.
ASSIGN d_ref->* TO <f_fs>. -
> Dynamic table creation with fields of the table
DATA: l_field TYPE fieldname,
l_field1 type fieldname.
SELECT * FROM (p_tablen) INTO CORRESPONDING FIELDS OF TABLE <f_fs>.
Fetching of the data from the table
LOOP AT <f_fs> ASSIGNING <f_fs2>.
Here u can check the validations and process
ASSIGN COMPONENT 2 OF STRUCTURE <f_fs2> TO <f_fs3>.
ASSIGN COMPONENT 3 OF STRUCTURE <f_fs2> TO <f_fs4>.
IF sy-subrc = 0.
MOVE <f_fs3> TO l_field.
MOVE <f_fs4> TO l_field1.
WRITE:/1 l_field(20),
22 l_field1(10).
ENDIF.
ENDLOOP.