ABAP Select data from SAP table KPP1LG into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP KPP1LG 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 KPP1LG. 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 KPP1LG 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_KPP1LG TYPE STANDARD TABLE OF KPP1LG,
      WA_KPP1LG TYPE KPP1LG,
      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: <KPP1LG> TYPE KPP1LG.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_KPP1LG.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM KPP1LG
  INTO TABLE IT_KPP1LG.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM KPP1LG
*  INTO TABLE @DATA(IT_KPP1LG2).
*--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_KPP1LG INDEX 1 INTO DATA(WA_KPP1LG2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_KPP1LG ASSIGNING <KPP1LG>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<KPP1LG>-RATIO = 1.
<KPP1LG>-CONT = 1.
<KPP1LG>-ROW = 1.
<KPP1LG>-COL = 1.
<KPP1LG>-POINTR = 1.

ENDLOOP.

LOOP AT IT_KPP1LG INTO WA_KPP1LG.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_KPP1LG-FTYPE, sy-vline,
  WA_KPP1LG-INTTYPE, sy-vline,
  WA_KPP1LG-ATTRB, sy-vline,
  WA_KPP1LG-KEYRA, sy-vline,
  WA_KPP1LG-TEXT, sy-vline,
  WA_KPP1LG-TEXTA, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_KPP1LG 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_KPP1LG 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_KPP1LG INTO WA_KPP1LG.


*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 ATTRB
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_KPP1LG-ATTRB
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_KPP1LG-ATTRB.
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_KPP1LG_STR, 
RATIO TYPE STRING,
CONT TYPE STRING,
ROW TYPE STRING,
COL TYPE STRING,
POINTR TYPE STRING,
FTYPE TYPE STRING,
INTTYPE TYPE STRING,
ATTRB TYPE STRING,
KEYRA TYPE STRING,
TEXT TYPE STRING,
TEXTA TYPE STRING,
LRIGHT TYPE STRING,
FLENGTH TYPE STRING,
FCOLUMN TYPE STRING,
ROUND TYPE STRING,
DECIM TYPE STRING,
INPUT TYPE STRING,
ACTIVE TYPE STRING,
SIGN TYPE STRING,
XFELD TYPE STRING,END OF T_EKKO_STR.
DATA: WA_KPP1LG_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_KPP1LG_STR-RATIO sy-vline 
WA_KPP1LG_STR-CONT sy-vline 
WA_KPP1LG_STR-ROW sy-vline 
WA_KPP1LG_STR-COL sy-vline 
WA_KPP1LG_STR-POINTR sy-vline 
WA_KPP1LG_STR-FTYPE sy-vline 
WA_KPP1LG_STR-INTTYPE sy-vline 
WA_KPP1LG_STR-ATTRB sy-vline 
WA_KPP1LG_STR-KEYRA sy-vline 
WA_KPP1LG_STR-TEXT sy-vline 
WA_KPP1LG_STR-TEXTA sy-vline 
WA_KPP1LG_STR-LRIGHT sy-vline 
WA_KPP1LG_STR-FLENGTH sy-vline 
WA_KPP1LG_STR-FCOLUMN sy-vline 
WA_KPP1LG_STR-ROUND sy-vline 
WA_KPP1LG_STR-DECIM sy-vline 
WA_KPP1LG_STR-INPUT sy-vline 
WA_KPP1LG_STR-ACTIVE sy-vline 
WA_KPP1LG_STR-SIGN sy-vline 
WA_KPP1LG_STR-XFELD sy-vline      INTO ld_text SEPARATED BY SPACE.

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