ABAP Select data from SAP table LGTKA into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM LGTKA
*  INTO TABLE @DATA(IT_LGTKA2).
*--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_LGTKA INDEX 1 INTO DATA(WA_LGTKA2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<LGTKA>-MANDT = 1.
<LGTKA>-LOCAT = 1.
<LGTKA>-TASKI = 1.
<LGTKA>-TKCNF = 1.
<LGTKA>-SQNCE = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_LGTKA-APOBJ, sy-vline,
  WA_LGTKA-EXRSN, sy-vline,
  WA_LGTKA-INRSN, sy-vline,
  WA_LGTKA-QTYBA, sy-vline,
  WA_LGTKA-HUNUMHUS, sy-vline,
  WA_LGTKA-HUTYPHUS, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_LGTKA 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_LGTKA 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_LGTKA INTO WA_LGTKA.


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

*Conversion exit TSTRM, internal->external for field TKCNF
CALL FUNCTION 'CONVERSION_EXIT_TSTRM_OUTPUT'
  EXPORTING
    input =                      WA_LGTKA-TKCNF
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_LGTKA-TKCNF.
WRITE:/ 'New Value:', ld_input.

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

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

*Conversion exit CUNIT, internal->external for field UOMBAQTS
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_LGTKA-UOMBAQTS
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_LGTKA-UOMBAQTS.
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_LGTKA_STR, 
MANDT TYPE STRING,
LOCAT TYPE STRING,
TASKI TYPE STRING,
TKCNF TYPE STRING,
SQNCE TYPE STRING,
APOBJ TYPE STRING,
EXRSN TYPE STRING,
INRSN TYPE STRING,
QTYBA TYPE STRING,
HUNUMHUS TYPE STRING,
HUTYPHUS TYPE STRING,
HUNUMHUD TYPE STRING,
HUTYPHUD TYPE STRING,
BATCH TYPE STRING,
QTYBAQTS TYPE STRING,
UOMBAQTS TYPE STRING,
RZONEDST TYPE STRING,
BINCXDST TYPE STRING,
BINCYDST TYPE STRING,
BINCZDST TYPE STRING,
RNODEDST TYPE STRING,
LTRM_DUMMY TYPE STRING,END OF T_EKKO_STR.
DATA: WA_LGTKA_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_LGTKA_STR-MANDT sy-vline 
WA_LGTKA_STR-LOCAT sy-vline 
WA_LGTKA_STR-TASKI sy-vline 
WA_LGTKA_STR-TKCNF sy-vline 
WA_LGTKA_STR-SQNCE sy-vline 
WA_LGTKA_STR-APOBJ sy-vline 
WA_LGTKA_STR-EXRSN sy-vline 
WA_LGTKA_STR-INRSN sy-vline 
WA_LGTKA_STR-QTYBA sy-vline 
WA_LGTKA_STR-HUNUMHUS sy-vline 
WA_LGTKA_STR-HUTYPHUS sy-vline 
WA_LGTKA_STR-HUNUMHUD sy-vline 
WA_LGTKA_STR-HUTYPHUD sy-vline 
WA_LGTKA_STR-BATCH sy-vline 
WA_LGTKA_STR-QTYBAQTS sy-vline 
WA_LGTKA_STR-UOMBAQTS sy-vline 
WA_LGTKA_STR-RZONEDST sy-vline 
WA_LGTKA_STR-BINCXDST sy-vline 
WA_LGTKA_STR-BINCYDST sy-vline 
WA_LGTKA_STR-BINCZDST sy-vline 
WA_LGTKA_STR-RNODEDST sy-vline 
WA_LGTKA_STR-LTRM_DUMMY sy-vline      INTO ld_text SEPARATED BY SPACE.

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