ABAP Select data from SAP table WLBWUSGWHM into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP WLBWUSGWHM 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 WLBWUSGWHM. 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 WLBWUSGWHM 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_WLBWUSGWHM TYPE STANDARD TABLE OF WLBWUSGWHM,
      WA_WLBWUSGWHM TYPE WLBWUSGWHM,
      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: <WLBWUSGWHM> TYPE WLBWUSGWHM.

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM WLBWUSGWHM
*  INTO TABLE @DATA(IT_WLBWUSGWHM2).
*--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_WLBWUSGWHM INDEX 1 INTO DATA(WA_WLBWUSGWHM2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<WLBWUSGWHM>-RSSID = 1.
<WLBWUSGWHM>-IPAKID = 1.
<WLBWUSGWHM>-ACTION = 1.
<WLBWUSGWHM>-INFOCUBE = 1.
<WLBWUSGWHM>-ISOURCE = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_WLBWUSGWHM-DSOURCE, sy-vline,
  WA_WLBWUSGWHM-LOGSYS, sy-vline,
  WA_WLBWUSGWHM-UNAME, sy-vline,
  WA_WLBWUSGWHM-MANUAL, sy-vline,
  WA_WLBWUSGWHM-TFMETHOD, sy-vline,
  WA_WLBWUSGWHM-RECORDS, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_WLBWUSGWHM 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_WLBWUSGWHM 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_WLBWUSGWHM INTO WA_WLBWUSGWHM.


*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_WLBWUSGWHM_STR, 
RSSID TYPE STRING,
IPAKID TYPE STRING,
ACTION TYPE STRING,
INFOCUBE TYPE STRING,
ISOURCE TYPE STRING,
DSOURCE TYPE STRING,
LOGSYS TYPE STRING,
UNAME TYPE STRING,
MANUAL TYPE STRING,
TFMETHOD TYPE STRING,
RECORDS TYPE STRING,
TIME TYPE STRING,
STARTTIME TYPE STRING,
ENDTIME TYPE STRING,END OF T_EKKO_STR.
DATA: WA_WLBWUSGWHM_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_WLBWUSGWHM_STR-RSSID sy-vline 
WA_WLBWUSGWHM_STR-IPAKID sy-vline 
WA_WLBWUSGWHM_STR-ACTION sy-vline 
WA_WLBWUSGWHM_STR-INFOCUBE sy-vline 
WA_WLBWUSGWHM_STR-ISOURCE sy-vline 
WA_WLBWUSGWHM_STR-DSOURCE sy-vline 
WA_WLBWUSGWHM_STR-LOGSYS sy-vline 
WA_WLBWUSGWHM_STR-UNAME sy-vline 
WA_WLBWUSGWHM_STR-MANUAL sy-vline 
WA_WLBWUSGWHM_STR-TFMETHOD sy-vline 
WA_WLBWUSGWHM_STR-RECORDS sy-vline 
WA_WLBWUSGWHM_STR-TIME sy-vline 
WA_WLBWUSGWHM_STR-STARTTIME sy-vline 
WA_WLBWUSGWHM_STR-ENDTIME sy-vline      INTO ld_text SEPARATED BY SPACE.

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