Dynamic Internal Table creation and population

Question

Hi gurus !
my issue refers to the slide 10 provided in this slideshow : https://www.sdn.sap.com/irj/scn/go/portal/prtroot/docs/library/uuid/b332e090-0201-0010-bdbd-b735e96fe0ae
My example is gonna sound dumb, but anyway: I want to dynamically select from a table into a dynamically created itab.
Letu2019s use only EKPO, and only field MENGE.
For this, I use Classes cl_abap_elemdescr, cl_sql_result_set and the Data Ref for table creation. But while fetching the resultset, program dumps when fields like MENGE, WRBTR are accessed. Obviously their type are not correctly taken into account by my program.
Here it comes:
DATA: element_ref             TYPE REF TO cl_abap_elemdescr,
      vl_fieldname               TYPE string,
             tl_components         TYPE abap_component_tab,
             sl_components         LIKE LINE OF tl_components_alv,
linetype_lcl               TYPE REF TO cl_abap_structdescr,
ty_table_type            TYPE REF TO cl_abap_tabledescr,
g_resultset             TYPE REF TO cl_sql_result_set
u2026
CONCATENATE sg_columns-table_name '-' sg_columns-column_name INTO vl_fieldname.
* sg_columns-table_name contains 'EKPO'
* sg_columns-column_name contains 'MENGE'
* getting the element as a component
element_ref ?= cl_abap_elemdescr=>describe_by_name( vl_fieldname ).
sl_components-name  = sg_columns-column_name.
sl_components-type ?= element_ref.
APPEND sl_components TO tl_components.
* dynamic creation of internal table
linetype_lcl = cl_abap_structdescr=>create( tl_components ).
ty_table_type = cl_abap_tabledescr=>create(
                  p_line_type = linetype_lcl ).
u2026
* Then I will create my field symbol table and line. Code has been cut here.
CREATE DATA dy_line LIKE LINE OF <dyn_table>.
u2026
* Then I will execute my query. Here itu2019s: Select MENGE From EKPO Where Rownum = 1.
  g_resultset = g_stmt_ref->execute_query( stmt_str ).
* Then structure for the Resultset is set
  CALL METHOD g_resultset->set_param_struct
    EXPORTING
      struct_ref = dy_line.
* Fetching the lines of the resultset  => Dumpu2026
  WHILE g_resultset->next( ) > 0.
    ASSIGN dy_line->* TO <dyn_wa>.
    APPEND <dyn_wa> TO <dyn_table>.
  ENDWHILE.
Anyone has any clue to how prevent my Dump ??
The component for MENGE seems to be described as a P7 with 2 decimals. And the resultset wanna use a QUAN type... or something like that !

Answer 1

Hello
I have expanded your sample coding for selecting three fields out of EKPO:
*& Report  ZUS_SDN_SQL_RESULT_SET
*& Thread: Dynamic Internal Table creation and population
*& <a class="jive_macro jive_macro_thread" href="" __jive_macro_name="thread" modifiedtitle="true" __default_attr="1375510"></a>
*& NOTE: Coding for dynamic structure / itab creation taken from:
*& Creating Flat and Complex Internal Tables Dynamically using RTTI
*& https://wiki.sdn.sap.com/wiki/display/Snippets/Creating+Flat+and+
*& Complex+Internal+Tables+Dynamically+using+RTTI
REPORT  zus_sdn_sql_result_set.
TYPE-POOLS: abap.
DATA:
go_sql_stmt       TYPE REF TO cl_sql_statement,
go_resultset      TYPE REF TO cl_sql_result_set,
gd_sql_clause     TYPE string.
DATA:
  gd_tabfield      TYPE string,
  go_table         TYPE REF TO cl_salv_table,
  go_sdescr_new    TYPE REF TO cl_abap_structdescr,
  go_tdescr        TYPE REF TO cl_abap_tabledescr,
  gdo_handle       TYPE REF TO data,
  gdo_record       TYPE REF TO data,
  gs_comp          TYPE abap_componentdescr,
  gt_components    TYPE abap_component_tab.
FIELD-SYMBOLS:
  <gs_record>   TYPE ANY,
  <gt_itab>     TYPE STANDARD TABLE.
START-OF-SELECTION.
continued.