ABAP Select data from SAP table WLF_D_SWL_HEAD_D into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM WLF_D_SWL_HEAD_D
*  INTO TABLE @DATA(IT_WLF_D_SWL_HEAD_D2).
*--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_WLF_D_SWL_HEAD_D INDEX 1 INTO DATA(WA_WLF_D_SWL_HEAD_D2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<WLF_D_SWL_HEAD_D>-MANDT = 1.
<WLF_D_SWL_HEAD_D>-SETTLMTMGMTSCHEDGWLUUID = 1.
<WLF_D_SWL_HEAD_D>-SETTLMTMGMTSCHEDGWL = 1.
<WLF_D_SWL_HEAD_D>-SAPOBJECTTYPE = 1.
<WLF_D_SWL_HEAD_D>-SAPOBJECTNODETYPE = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_WLF_D_SWL_HEAD_D-SETTLMTMGMTSCHEDGWLTYPE, sy-vline,
  WA_WLF_D_SWL_HEAD_D-SETTLMTMGMTSCHEDGWLTMPL, sy-vline,
  WA_WLF_D_SWL_HEAD_D-APPLICATIONJOBNAME, sy-vline,
  WA_WLF_D_SWL_HEAD_D-APPLICATIONJOB, sy-vline,
  WA_WLF_D_SWL_HEAD_D-SETTLMTMGMTSCHEDGWLSTATUS, sy-vline,
  WA_WLF_D_SWL_HEAD_D-APPLJOBPLANNEDSTARTDATETIME, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_WLF_D_SWL_HEAD_D 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_WLF_D_SWL_HEAD_D 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_WLF_D_SWL_HEAD_D INTO WA_WLF_D_SWL_HEAD_D.


*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_WLF_D_SWL_HEAD_D_STR, 
MANDT TYPE STRING,
SETTLMTMGMTSCHEDGWLUUID TYPE STRING,
SETTLMTMGMTSCHEDGWL TYPE STRING,
SAPOBJECTTYPE TYPE STRING,
SAPOBJECTNODETYPE TYPE STRING,
SETTLMTMGMTSCHEDGWLTYPE TYPE STRING,
SETTLMTMGMTSCHEDGWLTMPL TYPE STRING,
APPLICATIONJOBNAME TYPE STRING,
APPLICATIONJOB TYPE STRING,
SETTLMTMGMTSCHEDGWLSTATUS TYPE STRING,
APPLJOBPLANNEDSTARTDATETIME TYPE STRING,
CREATEDBYUSER TYPE STRING,
CREATIONUTCDATETIME TYPE STRING,
LASTCHANGEDBYUSER TYPE STRING,
LASTCHANGEUTCDATETIME TYPE STRING,
SETTLMTMGMTSCHEDGWLDESCRIPTION TYPE STRING,
SETTLMTMGMTSCHEDGWLRUNCAT TYPE STRING,
POSTINGDATE TYPE STRING,
DOCUMENTDATE TYPE STRING,
SETTLMTACTIVITYREASON TYPE STRING,
DRAFTENTITYCREATIONDATETIME TYPE STRING,
DRAFTENTITYLASTCHANGEDATETIME TYPE STRING,
DRAFTADMINISTRATIVEDATAUUID TYPE STRING,
DRAFTENTITYOPERATIONCODE TYPE STRING,
HASACTIVEENTITY TYPE STRING,
DRAFTFIELDCHANGES TYPE STRING,END OF T_EKKO_STR.
DATA: WA_WLF_D_SWL_HEAD_D_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_WLF_D_SWL_HEAD_D_STR-MANDT sy-vline 
WA_WLF_D_SWL_HEAD_D_STR-SETTLMTMGMTSCHEDGWLUUID sy-vline 
WA_WLF_D_SWL_HEAD_D_STR-SETTLMTMGMTSCHEDGWL sy-vline 
WA_WLF_D_SWL_HEAD_D_STR-SAPOBJECTTYPE sy-vline 
WA_WLF_D_SWL_HEAD_D_STR-SAPOBJECTNODETYPE sy-vline 
WA_WLF_D_SWL_HEAD_D_STR-SETTLMTMGMTSCHEDGWLTYPE sy-vline 
WA_WLF_D_SWL_HEAD_D_STR-SETTLMTMGMTSCHEDGWLTMPL sy-vline 
WA_WLF_D_SWL_HEAD_D_STR-APPLICATIONJOBNAME sy-vline 
WA_WLF_D_SWL_HEAD_D_STR-APPLICATIONJOB sy-vline 
WA_WLF_D_SWL_HEAD_D_STR-SETTLMTMGMTSCHEDGWLSTATUS sy-vline 
WA_WLF_D_SWL_HEAD_D_STR-APPLJOBPLANNEDSTARTDATETIME sy-vline 
WA_WLF_D_SWL_HEAD_D_STR-CREATEDBYUSER sy-vline 
WA_WLF_D_SWL_HEAD_D_STR-CREATIONUTCDATETIME sy-vline 
WA_WLF_D_SWL_HEAD_D_STR-LASTCHANGEDBYUSER sy-vline 
WA_WLF_D_SWL_HEAD_D_STR-LASTCHANGEUTCDATETIME sy-vline 
WA_WLF_D_SWL_HEAD_D_STR-SETTLMTMGMTSCHEDGWLDESCRIPTION sy-vline 
WA_WLF_D_SWL_HEAD_D_STR-SETTLMTMGMTSCHEDGWLRUNCAT sy-vline 
WA_WLF_D_SWL_HEAD_D_STR-POSTINGDATE sy-vline 
WA_WLF_D_SWL_HEAD_D_STR-DOCUMENTDATE sy-vline 
WA_WLF_D_SWL_HEAD_D_STR-SETTLMTACTIVITYREASON sy-vline 
WA_WLF_D_SWL_HEAD_D_STR-DRAFTENTITYCREATIONDATETIME sy-vline 
WA_WLF_D_SWL_HEAD_D_STR-DRAFTENTITYLASTCHANGEDATETIME sy-vline 
WA_WLF_D_SWL_HEAD_D_STR-DRAFTADMINISTRATIVEDATAUUID sy-vline 
WA_WLF_D_SWL_HEAD_D_STR-DRAFTENTITYOPERATIONCODE sy-vline 
WA_WLF_D_SWL_HEAD_D_STR-HASACTIVEENTITY sy-vline 
WA_WLF_D_SWL_HEAD_D_STR-DRAFTFIELDCHANGES sy-vline      INTO ld_text SEPARATED BY SPACE.

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