ABAP Select data from SAP table LTKPL into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM LTKPL
*  INTO TABLE @DATA(IT_LTKPL2).
*--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_LTKPL INDEX 1 INTO DATA(WA_LTKPL2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<LTKPL>-MANDT = 1.
<LTKPL>-LOCAT = 1.
<LTKPL>-TASKI = 1.
<LTKPL>-GRPRF = 1.
<LTKPL>-TKSTS = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_LTKPL-TOTPR, sy-vline,
  WA_LTKPL-PRORS, sy-vline,
  WA_LTKPL-TKTYP, sy-vline,
  WA_LTKPL-ACTIV, sy-vline,
  WA_LTKPL-DDATE, sy-vline,
  WA_LTKPL-RZONESRC, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_LTKPL 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_LTKPL 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_LTKPL INTO WA_LTKPL.


*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_LTKPL-TASKI
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_LTKPL-TASKI.
WRITE:/ 'New Value:', ld_input.

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

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

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

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

*Conversion exit ALPHA, internal->external for field RSRCE
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_LTKPL-RSRCE
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_LTKPL-RSRCE.
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_LTKPL_STR, 
MANDT TYPE STRING,
LOCAT TYPE STRING,
TASKI TYPE STRING,
GRPRF TYPE STRING,
TKSTS TYPE STRING,
TOTPR TYPE STRING,
PRORS TYPE STRING,
TKTYP TYPE STRING,
ACTIV TYPE STRING,
DDATE TYPE STRING,
RZONESRC TYPE STRING,
BINCXSRC TYPE STRING,
BINCYSRC TYPE STRING,
BINCZSRC TYPE STRING,
RNODESRC TYPE STRING,
RZONEDST TYPE STRING,
BINCXDST TYPE STRING,
BINCYDST TYPE STRING,
BINCZDST TYPE STRING,
RNODEDST TYPE STRING,
RNODE TYPE STRING,
WAREA TYPE STRING,
HUNUMSRC TYPE STRING,
HUTYPSRC TYPE STRING,
HUNUMDST TYPE STRING,
HUTYPDST TYPE STRING,
TKCRT TYPE STRING,
RSRCE TYPE STRING,
ASNTY TYPE STRING,
SRCLVL TYPE STRING,
DSTLVL TYPE STRING,
LTRM_DUMMY TYPE STRING,END OF T_EKKO_STR.
DATA: WA_LTKPL_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_LTKPL_STR-MANDT sy-vline 
WA_LTKPL_STR-LOCAT sy-vline 
WA_LTKPL_STR-TASKI sy-vline 
WA_LTKPL_STR-GRPRF sy-vline 
WA_LTKPL_STR-TKSTS sy-vline 
WA_LTKPL_STR-TOTPR sy-vline 
WA_LTKPL_STR-PRORS sy-vline 
WA_LTKPL_STR-TKTYP sy-vline 
WA_LTKPL_STR-ACTIV sy-vline 
WA_LTKPL_STR-DDATE sy-vline 
WA_LTKPL_STR-RZONESRC sy-vline 
WA_LTKPL_STR-BINCXSRC sy-vline 
WA_LTKPL_STR-BINCYSRC sy-vline 
WA_LTKPL_STR-BINCZSRC sy-vline 
WA_LTKPL_STR-RNODESRC sy-vline 
WA_LTKPL_STR-RZONEDST sy-vline 
WA_LTKPL_STR-BINCXDST sy-vline 
WA_LTKPL_STR-BINCYDST sy-vline 
WA_LTKPL_STR-BINCZDST sy-vline 
WA_LTKPL_STR-RNODEDST sy-vline 
WA_LTKPL_STR-RNODE sy-vline 
WA_LTKPL_STR-WAREA sy-vline 
WA_LTKPL_STR-HUNUMSRC sy-vline 
WA_LTKPL_STR-HUTYPSRC sy-vline 
WA_LTKPL_STR-HUNUMDST sy-vline 
WA_LTKPL_STR-HUTYPDST sy-vline 
WA_LTKPL_STR-TKCRT sy-vline 
WA_LTKPL_STR-RSRCE sy-vline 
WA_LTKPL_STR-ASNTY sy-vline 
WA_LTKPL_STR-SRCLVL sy-vline 
WA_LTKPL_STR-DSTLVL sy-vline 
WA_LTKPL_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.