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On selection screen, the user needs to insert a table name, and I need to get first 3 fields from that table and display them in an ALV for the output. What I understand from reading tutorials is that I need to call method cl_alv_table_create=>create_dynamic_table, but I don't know how to create the fieldcatalog.
DATA: t_newtable TYPE REF TO data,
t_fldcat TYPE lvc_t_fcat,
CALL METHOD cl_alv_table_create=>create_dynamic_table
EXPORTING
it_fieldcatalog = t_fldcat
IMPORTING
ep_table = t_newtable.
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* Create Dynamic Table CALL METHOD cl_alv_table_create=>create_dynamic_table EXPORTING it_fieldcatalog = lt_fcat[] IMPORTING ep_table = dy_table. ASSIGN dy_table->* TO <dyn_table>. * Create Dynamic Work Area and Assign to FS CREATE DATA dy_line LIKE LINE OF <dyn_table>.
Dynamic Internal Tables are tables created at RUN TIME Using Field Symbols. It's useful in creating a program where you don't know name of table till run time. In other words it's very useful in creating Dynamic Programs.
. A dynamic tables is a table that changes its number of rows depending on the input received in your launch form. As business users fill out the launch form, their responses generate the appropriate number of rows in the table.
Create your field catalog either manually or automatically using the function module, LVC_FIELDCATALOG_MERGE. Add more rows to the field catalog table (T_FIELDCAT) at run time. 2. Use the field catalog to create a table dynamically using the method below.
I assume that the table name which user enters is a data dictionary table (like SFLIGHT). If yes, then you can generate the field catalog as follows.
data : it_tabdescr type abap_compdescr_tab,
wa_tabdescr type abap_compdescr.
data : ref_table_descr type ref to cl_abap_structdescr.
ref_table_descr ?= cl_abap_typedescr=>describe_by_name( p_table ).
it_tabdescr[] = ref_table_descr->components[].
loop at it_tabdescr into wa_tabdescr.
clear wa_fieldcat.
wa_fieldcat-fieldname = wa_tabdescr-name .
wa_fieldcat-datatype = wa_tabdescr-type_kind.
wa_fieldcat-inttype = wa_tabdescr-type_kind.
wa_fieldcat-intlen = wa_tabdescr-length.
wa_fieldcat-decimals = wa_tabdescr-decimals.
append wa_fieldcat to it_fieldcat.
endloop.
Here, "p_table" is the selection screen parameter containing the table name.
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