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Creating a dynamic structure |
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Written by Anon.
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Saturday, 20 January 2007 |
Question : Subject : Dynamic structure
does anyone know if it's possible to declare a dynamic structure?
my program receives a record-field of 1000, and I need to overlay this record with a structure that needs to
be dynamic.
Reply : Subject : Dynamic structure
if your structure changes from one defined structure to another one, you can try this:
ASSIGN yourfield CASTING TYPE yourstructure
or CREATE DATA yourdata TYPE yourstructure.
If your structure has to be really dynamic - like ALV - you can use the class CL_ALV_TABLE_CREATE.
try this example:
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REPORT zmaschl_create_data_dynamic .
TYPE-POOLS: slis.
DATA: it_fcat TYPE slis_t_fieldcat_alv,
is_fcat LIKE LINE OF it_fcat.
DATA: it_fieldcat TYPE lvc_t_fcat,
is_fieldcat LIKE LINE OF it_fieldcat.
DATA: new_table TYPE REF TO data.
DATA: new_line TYPE REF TO data.
FIELD-SYMBOLS: <l_table> TYPE ANY TABLE,
<l_line> TYPE ANY,
<l_field> TYPE ANY.
* Build fieldcat
CALL FUNCTION 'REUSE_ALV_FIELDCATALOG_MERGE'
EXPORTING
i_structure_name = 'SYST'
CHANGING
ct_fieldcat = it_fcat[].
LOOP AT it_fcat INTO is_fcat WHERE NOT reptext_ddic IS initial.
MOVE-CORRESPONDING is_fcat TO is_fieldcat.
is_fieldcat-fieldname = is_fcat-fieldname.
is_fieldcat-ref_field = is_fcat-fieldname.
is_fieldcat-ref_table = is_fcat-ref_tabname.
APPEND is_fieldcat TO it_fieldcat.
ENDLOOP.
* Create a new Table
CALL METHOD cl_alv_table_create=>create_dynamic_table
EXPORTING
it_fieldcatalog = it_fieldcat
IMPORTING
ep_table = new_table.
* Create a new Line with the same structure of the table.
ASSIGN new_table->* TO <l_table>.
CREATE DATA new_line LIKE LINE OF <l_table>.
ASSIGN new_line->* TO <l_line>.
* Test it...
DO 30 TIMES.
ASSIGN COMPONENT 'SUBRC' OF STRUCTURE <l_line> TO <l_field>.
<l_field> = sy-index.
INSERT <l_line> INTO TABLE <l_table>.
ENDDO.
LOOP AT <l_table> ASSIGNING <l_line>.
ASSIGN COMPONENT 'SUBRC' OF STRUCTURE <l_line> TO <l_field>.
WRITE <l_field>.
ENDLOOP.
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