ABAP Select data from SAP table SGLWLNUMAS into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP SGLWLNUMAS table and store it within an internal table, including using the newer @DATA inline declaration methods. It also shows you various ways to process this data using ABAP work area, inline declaration or field symbols including executing all the relevant CONVERSION_EXIT routines specific to SGLWLNUMAS. See here for more generic Select statement tips.

Sometimes data within SAP is stored within the database table in a different format to what it is displayed to the user. These input/output conversation FM routines are what translates the data between the two formats.

There is also a full declaration of the SGLWLNUMAS table where each field has a char/string type for you to simply copy and paste. This allows you to use processing that is only available to these field types such as the CONCATENATE statement.

DATA: IT_SGLWLNUMAS TYPE STANDARD TABLE OF SGLWLNUMAS,
      WA_SGLWLNUMAS TYPE SGLWLNUMAS,
      GD_STR TYPE STRING.

DATA: lo_typedescr type REF TO cl_abap_typedescr.
DATA: lv_fieldname type fieldname.

FIELD-SYMBOLS: <FIELD> TYPE any.
FIELD-SYMBOLS: <SGLWLNUMAS> TYPE SGLWLNUMAS.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_SGLWLNUMAS.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM SGLWLNUMAS
  INTO TABLE IT_SGLWLNUMAS.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM SGLWLNUMAS
*  INTO TABLE @DATA(IT_SGLWLNUMAS2).
*--Further methods of using ABAP code to  select data from SAP database tables

*You can also declare the header/work area using the in-line DATA declaration method
READ TABLE IT_SGLWLNUMAS INDEX 1 INTO DATA(WA_SGLWLNUMAS2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_SGLWLNUMAS ASSIGNING <SGLWLNUMAS>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<SGLWLNUMAS>-COUNT = 1.
<SGLWLNUMAS>-DCOUNT = 1.
<SGLWLNUMAS>-BCOUNT = 1.
<SGLWLNUMAS>-UCOUNT = 1.
<SGLWLNUMAS>-RESPTI = 1.

ENDLOOP.

LOOP AT IT_SGLWLNUMAS INTO WA_SGLWLNUMAS.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_SGLWLNUMAS-CPUTI, sy-vline,
  WA_SGLWLNUMAS-QUEUETI, sy-vline,
  WA_SGLWLNUMAS-READDIRCNT, sy-vline,
  WA_SGLWLNUMAS-READDIRTI, sy-vline,
  WA_SGLWLNUMAS-READDIRBUF, sy-vline,
  WA_SGLWLNUMAS-READSEQCNT, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_SGLWLNUMAS you want to display...

  WRITE:/ sy-uline.
* Aternatively use generic code to Write field values (and NAME) to screen report
  DO.
    ASSIGN COMPONENT sy-index OF STRUCTURE wa_SGLWLNUMAS TO <field>.
    IF sy-subrc <> 0. EXIT. ENDIF.
    WRITE:/ 'Field Value', <field>, sy-vline.
    gd_str = <field> .
    lo_typedescr ?= CL_ABAP_DATADESCR=>DESCRIBE_BY_DATA( <field> ).
    lv_fieldname = lo_typedescr->GET_RELATIVE_NAME( ).
    WRITE:/ 'Field Name', lv_fieldname.
  ENDDO.

  
*Redo loop but convert all fields from internal to out value  
LOOP AT IT_SGLWLNUMAS INTO WA_SGLWLNUMAS.


*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Convert all fields to display/output versions using conversion routines
  PERFORM convert_all_field_values CHANGING wa_EKKO.
	 
ENDLOOP.

  
*&---------------------------------------------------------------------*
*& Form convert_all_field_values
*&---------------------------------------------------------------------*
FORM convert_all_field_values CHANGING p_EKKO LIKE wa_EKKO.
DATA: ld_input(1000) TYPE c, ld_output(1000) TYPE C.
ENDFORM. 

*&---------------------------------------------------------------------*
*& Form process_as_string_field_values
*&---------------------------------------------------------------------*
FORM process_as_string_field_values CHANGING p_EKKO LIKE wa_EKKO.

TYPES: BEGIN OF T_SGLWLNUMAS_STR, 
COUNT TYPE STRING,
DCOUNT TYPE STRING,
BCOUNT TYPE STRING,
UCOUNT TYPE STRING,
RESPTI TYPE STRING,
CPUTI TYPE STRING,
QUEUETI TYPE STRING,
READDIRCNT TYPE STRING,
READDIRTI TYPE STRING,
READDIRBUF TYPE STRING,
READSEQCNT TYPE STRING,
READSEQTI TYPE STRING,
PHYREADCNT TYPE STRING,
CHNGCNT TYPE STRING,
CHNGTI TYPE STRING,
PHYCHNGREC TYPE STRING,
BYTES TYPE STRING,
MCTI TYPE STRING,END OF T_EKKO_STR.
DATA: WA_SGLWLNUMAS_STR type T_EKKO_STR.

DATA: ld_text TYPE string.

LOOP AT IT_EKKO INTO WA_EKKO.
  MOVE-CORRESPONDING wa_EKKO TO WA_EKKO_STR.
  CONCATENATE: sy-vline
WA_SGLWLNUMAS_STR-COUNT sy-vline 
WA_SGLWLNUMAS_STR-DCOUNT sy-vline 
WA_SGLWLNUMAS_STR-BCOUNT sy-vline 
WA_SGLWLNUMAS_STR-UCOUNT sy-vline 
WA_SGLWLNUMAS_STR-RESPTI sy-vline 
WA_SGLWLNUMAS_STR-CPUTI sy-vline 
WA_SGLWLNUMAS_STR-QUEUETI sy-vline 
WA_SGLWLNUMAS_STR-READDIRCNT sy-vline 
WA_SGLWLNUMAS_STR-READDIRTI sy-vline 
WA_SGLWLNUMAS_STR-READDIRBUF sy-vline 
WA_SGLWLNUMAS_STR-READSEQCNT sy-vline 
WA_SGLWLNUMAS_STR-READSEQTI sy-vline 
WA_SGLWLNUMAS_STR-PHYREADCNT sy-vline 
WA_SGLWLNUMAS_STR-CHNGCNT sy-vline 
WA_SGLWLNUMAS_STR-CHNGTI sy-vline 
WA_SGLWLNUMAS_STR-PHYCHNGREC sy-vline 
WA_SGLWLNUMAS_STR-BYTES sy-vline 
WA_SGLWLNUMAS_STR-MCTI sy-vline      INTO ld_text SEPARATED BY SPACE.

*Add any further fields from structure WA_EKKO_STR you want to CONCATENATE...
ENDLOOP.
ENDFORM.