ABAP Select data from SAP table KNUMA_LI into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM KNUMA_LI
*  INTO TABLE @DATA(IT_KNUMA_LI2).
*--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_KNUMA_LI INDEX 1 INTO DATA(WA_KNUMA_LI2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<KNUMA_LI>-ABRLF = 1.
<KNUMA_LI>-ERNAM = 1.
<KNUMA_LI>-ABRDATE = 1.
<KNUMA_LI>-BUDATE = 1.
<KNUMA_LI>-ARTABR_TXT = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_KNUMA_LI-UMSVT_TXT, sy-vline,
  WA_KNUMA_LI-S_ABRLF, sy-vline,
  WA_KNUMA_LI-BLDATE, sy-vline,
  WA_KNUMA_LI-KNUMA, sy-vline,
  WA_KNUMA_LI-ERDAT, sy-vline,
  WA_KNUMA_LI-ERZET, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_KNUMA_LI 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_KNUMA_LI 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_KNUMA_LI INTO WA_KNUMA_LI.


*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 ABRLF
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_KNUMA_LI-ABRLF
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_KNUMA_LI-ABRLF.
WRITE:/ 'New Value:', ld_input.

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

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

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

*Conversion exit ALPHA, internal->external for field BONEM
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_KNUMA_LI-BONEM
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_KNUMA_LI-BONEM.
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_KNUMA_LI_STR, 
ABRLF TYPE STRING,
ERNAM TYPE STRING,
ABRDATE TYPE STRING,
BUDATE TYPE STRING,
ARTABR_TXT TYPE STRING,
UMSVT_TXT TYPE STRING,
S_ABRLF TYPE STRING,
BLDATE TYPE STRING,
KNUMA TYPE STRING,
ERDAT TYPE STRING,
ERZET TYPE STRING,
BOLIF TYPE STRING,
EKORG TYPE STRING,
EKGRP TYPE STRING,
BONEM TYPE STRING,
VKORG TYPE STRING,
VTWEG TYPE STRING,
SPART TYPE STRING,
DATAB TYPE STRING,
DATBI TYPE STRING,
BOSTA TYPE STRING,
BOSTA_TXT TYPE STRING,
IDENT1 TYPE STRING,END OF T_EKKO_STR.
DATA: WA_KNUMA_LI_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_KNUMA_LI_STR-ABRLF sy-vline 
WA_KNUMA_LI_STR-ERNAM sy-vline 
WA_KNUMA_LI_STR-ABRDATE sy-vline 
WA_KNUMA_LI_STR-BUDATE sy-vline 
WA_KNUMA_LI_STR-ARTABR_TXT sy-vline 
WA_KNUMA_LI_STR-UMSVT_TXT sy-vline 
WA_KNUMA_LI_STR-S_ABRLF sy-vline 
WA_KNUMA_LI_STR-BLDATE sy-vline 
WA_KNUMA_LI_STR-KNUMA sy-vline 
WA_KNUMA_LI_STR-ERDAT sy-vline 
WA_KNUMA_LI_STR-ERZET sy-vline 
WA_KNUMA_LI_STR-BOLIF sy-vline 
WA_KNUMA_LI_STR-EKORG sy-vline 
WA_KNUMA_LI_STR-EKGRP sy-vline 
WA_KNUMA_LI_STR-BONEM sy-vline 
WA_KNUMA_LI_STR-VKORG sy-vline 
WA_KNUMA_LI_STR-VTWEG sy-vline 
WA_KNUMA_LI_STR-SPART sy-vline 
WA_KNUMA_LI_STR-DATAB sy-vline 
WA_KNUMA_LI_STR-DATBI sy-vline 
WA_KNUMA_LI_STR-BOSTA sy-vline 
WA_KNUMA_LI_STR-BOSTA_TXT sy-vline 
WA_KNUMA_LI_STR-IDENT1 sy-vline      INTO ld_text SEPARATED BY SPACE.

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