ABAP Select data from SAP table WAKL1 into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP WAKL1 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 WAKL1. 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 WAKL1 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_WAKL1 TYPE STANDARD TABLE OF WAKL1,
      WA_WAKL1 TYPE WAKL1,
      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: <WAKL1> TYPE WAKL1.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_WAKL1.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM WAKL1
  INTO TABLE IT_WAKL1.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM WAKL1
*  INTO TABLE @DATA(IT_WAKL12).
*--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_WAKL1 INDEX 1 INTO DATA(WA_WAKL12).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_WAKL1 ASSIGNING <WAKL1>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<WAKL1>-AKTNR = 1.
<WAKL1>-AKTKT = 1.
<WAKL1>-AKTYP = 1.
<WAKL1>-ATYTX = 1.
<WAKL1>-AKART = 1.

ENDLOOP.

LOOP AT IT_WAKL1 INTO WA_WAKL1.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_WAKL1-ARTTX, sy-vline,
  WA_WAKL1-WAELA, sy-vline,
  WA_WAKL1-BEKTY, sy-vline,
  WA_WAKL1-BEKTY_AATXT, sy-vline,
  WA_WAKL1-AKVST, sy-vline,
  WA_WAKL1-AKVST_DDTEXT, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_WAKL1 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_WAKL1 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_WAKL1 INTO WA_WAKL1.


*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.

*Conversion exit ALPHA, internal->external for field AKTNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_WAKL1-AKTNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_WAKL1-AKTNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit CUNIT, internal->external for field MEBME
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_WAKL1-MEBME
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_WAKL1-MEBME.
WRITE:/ 'New Value:', ld_input.

*Conversion exit CUNIT, internal->external for field MEBPR
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_WAKL1-MEBPR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_WAKL1-MEBPR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit CUNIT, internal->external for field MEAUF
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_WAKL1-MEAUF
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_WAKL1-MEAUF.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field ABELN
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_WAKL1-ABELN
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_WAKL1-ABELN.
WRITE:/ 'New Value:', ld_input.
ENDFORM. 

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

TYPES: BEGIN OF T_WAKL1_STR, 
AKTNR TYPE STRING,
AKTKT TYPE STRING,
AKTYP TYPE STRING,
ATYTX TYPE STRING,
AKART TYPE STRING,
ARTTX TYPE STRING,
WAELA TYPE STRING,
BEKTY TYPE STRING,
BEKTY_AATXT TYPE STRING,
AKVST TYPE STRING,
AKVST_DDTEXT TYPE STRING,
EKDAB TYPE STRING,
EKDBI TYPE STRING,
VKDAB TYPE STRING,
VKDBI TYPE STRING,
ALIVO TYPE STRING,
ALIBI TYPE STRING,
SPGRU TYPE STRING,
SPGRU_DDTEXT TYPE STRING,
FADAT TYPE STRING,
SADAT TYPE STRING,
FLDAT TYPE STRING,
SLDAT TYPE STRING,
MEBME TYPE STRING,
AKTHE TYPE STRING,
AKTHE_AKTTT TYPE STRING,
PUMVP TYPE STRING,
PUMEP TYPE STRING,
PABBM TYPE STRING,
AUFME TYPE STRING,
PLVKP TYPE STRING,
VPEIN TYPE STRING,
PLEKP TYPE STRING,
EPEIN TYPE STRING,
WAEEK TYPE STRING,
MEBPR TYPE STRING,
MEAUF TYPE STRING,
MIAMG TYPE STRING,
ABELN TYPE STRING,
NVKP TYPE STRING,END OF T_EKKO_STR.
DATA: WA_WAKL1_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_WAKL1_STR-AKTNR sy-vline 
WA_WAKL1_STR-AKTKT sy-vline 
WA_WAKL1_STR-AKTYP sy-vline 
WA_WAKL1_STR-ATYTX sy-vline 
WA_WAKL1_STR-AKART sy-vline 
WA_WAKL1_STR-ARTTX sy-vline 
WA_WAKL1_STR-WAELA sy-vline 
WA_WAKL1_STR-BEKTY sy-vline 
WA_WAKL1_STR-BEKTY_AATXT sy-vline 
WA_WAKL1_STR-AKVST sy-vline 
WA_WAKL1_STR-AKVST_DDTEXT sy-vline 
WA_WAKL1_STR-EKDAB sy-vline 
WA_WAKL1_STR-EKDBI sy-vline 
WA_WAKL1_STR-VKDAB sy-vline 
WA_WAKL1_STR-VKDBI sy-vline 
WA_WAKL1_STR-ALIVO sy-vline 
WA_WAKL1_STR-ALIBI sy-vline 
WA_WAKL1_STR-SPGRU sy-vline 
WA_WAKL1_STR-SPGRU_DDTEXT sy-vline 
WA_WAKL1_STR-FADAT sy-vline 
WA_WAKL1_STR-SADAT sy-vline 
WA_WAKL1_STR-FLDAT sy-vline 
WA_WAKL1_STR-SLDAT sy-vline 
WA_WAKL1_STR-MEBME sy-vline 
WA_WAKL1_STR-AKTHE sy-vline 
WA_WAKL1_STR-AKTHE_AKTTT sy-vline 
WA_WAKL1_STR-PUMVP sy-vline 
WA_WAKL1_STR-PUMEP sy-vline 
WA_WAKL1_STR-PABBM sy-vline 
WA_WAKL1_STR-AUFME sy-vline 
WA_WAKL1_STR-PLVKP sy-vline 
WA_WAKL1_STR-VPEIN sy-vline 
WA_WAKL1_STR-PLEKP sy-vline 
WA_WAKL1_STR-EPEIN sy-vline 
WA_WAKL1_STR-WAEEK sy-vline 
WA_WAKL1_STR-MEBPR sy-vline 
WA_WAKL1_STR-MEAUF sy-vline 
WA_WAKL1_STR-MIAMG sy-vline 
WA_WAKL1_STR-ABELN sy-vline 
WA_WAKL1_STR-NVKP sy-vline      INTO ld_text SEPARATED BY SPACE.

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