ABAP Select data from SAP table E2KLAHM into internal table

Get Example source ABAP code based on a different SAP table
  Get ABAP code

Below is a number of ABAP code snippets to demonstrate how to select data from SAP E2KLAHM 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 E2KLAHM. 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 E2KLAHM 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_E2KLAHM TYPE STANDARD TABLE OF E2KLAHM,
      WA_E2KLAHM TYPE E2KLAHM,
      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: <E2KLAHM> TYPE E2KLAHM.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_E2KLAHM.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM E2KLAHM
  INTO TABLE IT_E2KLAHM.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM E2KLAHM
*  INTO TABLE @DATA(IT_E2KLAHM2).
*--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_E2KLAHM INDEX 1 INTO DATA(WA_E2KLAHM2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_E2KLAHM ASSIGNING <E2KLAHM>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<E2KLAHM>-MSGFN = 1.
<E2KLAHM>-KLART = 1.
<E2KLAHM>-CLASS = 1.
<E2KLAHM>-STATU = 1.
<E2KLAHM>-KLAGR = 1.

ENDLOOP.

LOOP AT IT_E2KLAHM INTO WA_E2KLAHM.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_E2KLAHM-BGRSE, sy-vline,
  WA_E2KLAHM-BGRKL, sy-vline,
  WA_E2KLAHM-BGRKP, sy-vline,
  WA_E2KLAHM-ANAME, sy-vline,
  WA_E2KLAHM-ADATU, sy-vline,
  WA_E2KLAHM-VNAME, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_E2KLAHM 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_E2KLAHM 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_E2KLAHM INTO WA_E2KLAHM.


*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 DOKNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_E2KLAHM-DOKNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_E2KLAHM-DOKNR.
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_E2KLAHM_STR, 
MSGFN TYPE STRING,
KLART TYPE STRING,
CLASS TYPE STRING,
STATU TYPE STRING,
KLAGR TYPE STRING,
BGRSE TYPE STRING,
BGRKL TYPE STRING,
BGRKP TYPE STRING,
ANAME TYPE STRING,
ADATU TYPE STRING,
VNAME TYPE STRING,
VDATU TYPE STRING,
VONDT TYPE STRING,
BISDT TYPE STRING,
PRAUS TYPE STRING,
SICHT TYPE STRING,
DOKNR TYPE STRING,
DOKAR TYPE STRING,
DOKTL TYPE STRING,
DOKVR TYPE STRING,
DINKZ TYPE STRING,
NNORM TYPE STRING,
NORMN TYPE STRING,
NORMB TYPE STRING,
NRMT1 TYPE STRING,
NRMT2 TYPE STRING,
AUSGD TYPE STRING,
VERSD TYPE STRING,
VERSI TYPE STRING,
LEIST TYPE STRING,
VERWE TYPE STRING,
SPART TYPE STRING,
WWSKZ TYPE STRING,
WWSSI TYPE STRING,
POTPR TYPE STRING,
CLOBK TYPE STRING,
CLMUL TYPE STRING,
CVIEW TYPE STRING,
DISST TYPE STRING,
MEINS TYPE STRING,
CLMOD TYPE STRING,
VWSTL TYPE STRING,
VWPLA TYPE STRING,
CLALT TYPE STRING,END OF T_EKKO_STR.
DATA: WA_E2KLAHM_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_E2KLAHM_STR-MSGFN sy-vline 
WA_E2KLAHM_STR-KLART sy-vline 
WA_E2KLAHM_STR-CLASS sy-vline 
WA_E2KLAHM_STR-STATU sy-vline 
WA_E2KLAHM_STR-KLAGR sy-vline 
WA_E2KLAHM_STR-BGRSE sy-vline 
WA_E2KLAHM_STR-BGRKL sy-vline 
WA_E2KLAHM_STR-BGRKP sy-vline 
WA_E2KLAHM_STR-ANAME sy-vline 
WA_E2KLAHM_STR-ADATU sy-vline 
WA_E2KLAHM_STR-VNAME sy-vline 
WA_E2KLAHM_STR-VDATU sy-vline 
WA_E2KLAHM_STR-VONDT sy-vline 
WA_E2KLAHM_STR-BISDT sy-vline 
WA_E2KLAHM_STR-PRAUS sy-vline 
WA_E2KLAHM_STR-SICHT sy-vline 
WA_E2KLAHM_STR-DOKNR sy-vline 
WA_E2KLAHM_STR-DOKAR sy-vline 
WA_E2KLAHM_STR-DOKTL sy-vline 
WA_E2KLAHM_STR-DOKVR sy-vline 
WA_E2KLAHM_STR-DINKZ sy-vline 
WA_E2KLAHM_STR-NNORM sy-vline 
WA_E2KLAHM_STR-NORMN sy-vline 
WA_E2KLAHM_STR-NORMB sy-vline 
WA_E2KLAHM_STR-NRMT1 sy-vline 
WA_E2KLAHM_STR-NRMT2 sy-vline 
WA_E2KLAHM_STR-AUSGD sy-vline 
WA_E2KLAHM_STR-VERSD sy-vline 
WA_E2KLAHM_STR-VERSI sy-vline 
WA_E2KLAHM_STR-LEIST sy-vline 
WA_E2KLAHM_STR-VERWE sy-vline 
WA_E2KLAHM_STR-SPART sy-vline 
WA_E2KLAHM_STR-WWSKZ sy-vline 
WA_E2KLAHM_STR-WWSSI sy-vline 
WA_E2KLAHM_STR-POTPR sy-vline 
WA_E2KLAHM_STR-CLOBK sy-vline 
WA_E2KLAHM_STR-CLMUL sy-vline 
WA_E2KLAHM_STR-CVIEW sy-vline 
WA_E2KLAHM_STR-DISST sy-vline 
WA_E2KLAHM_STR-MEINS sy-vline 
WA_E2KLAHM_STR-CLMOD sy-vline 
WA_E2KLAHM_STR-VWSTL sy-vline 
WA_E2KLAHM_STR-VWPLA sy-vline 
WA_E2KLAHM_STR-CLALT sy-vline      INTO ld_text SEPARATED BY SPACE.

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