ABAP Select data from SAP table LTAK into internal table

Get Example source ABAP code based on a different SAP table
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Below is a number of ABAP code snippets to demonstrate how to select data from SAP LTAK 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 LTAK. 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 LTAK 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_LTAK TYPE STANDARD TABLE OF LTAK,
      WA_LTAK TYPE LTAK,
      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: <LTAK> TYPE LTAK.

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM LTAK
*  INTO TABLE @DATA(IT_LTAK2).
*--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_LTAK INDEX 1 INTO DATA(WA_LTAK2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<LTAK>-MANDT = 1.
<LTAK>-LGNUM = 1.
<LTAK>-TANUM = 1.
<LTAK>-BWART = 1.
<LTAK>-BWLVS = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_LTAK-TBPRI, sy-vline,
  WA_LTAK-TRART, sy-vline,
  WA_LTAK-BDATU, sy-vline,
  WA_LTAK-BZEIT, sy-vline,
  WA_LTAK-BNAME, sy-vline,
  WA_LTAK-REFNR, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_LTAK 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_LTAK 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_LTAK INTO WA_LTAK.


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

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

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

*Conversion exit GJAHR, internal->external for field MJAHR
CALL FUNCTION 'CONVERSION_EXIT_GJAHR_OUTPUT'
  EXPORTING
    input =                      WA_LTAK-MJAHR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_LTAK-MJAHR.
WRITE:/ 'New Value:', ld_input.

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

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

*Conversion exit CUNIT, internal->external for field ZEIEI
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_LTAK-ZEIEI
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_LTAK-ZEIEI.
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_LTAK_STR, 
MANDT TYPE STRING,
LGNUM TYPE STRING,
TANUM TYPE STRING,
BWART TYPE STRING,
BWLVS TYPE STRING,
TBPRI TYPE STRING,
TRART TYPE STRING,
BDATU TYPE STRING,
BZEIT TYPE STRING,
BNAME TYPE STRING,
REFNR TYPE STRING,
TBNUM TYPE STRING,
UBNUM TYPE STRING,
VBELN TYPE STRING,
KQUIT TYPE STRING,
QDATU TYPE STRING,
MBLNR TYPE STRING,
MJAHR TYPE STRING,
BETYP TYPE STRING,
BENUM TYPE STRING,
DRUKZ TYPE STRING,
DRUCK TYPE STRING,
TEILK TYPE STRING,
KR2SO TYPE STRING,
KR2KU TYPE STRING,
KDISO TYPE STRING,
KZPLA TYPE STRING,
PLDAT TYPE STRING,
RSNUM TYPE STRING,
LZNUM TYPE STRING,
BDART TYPE STRING,
PKNUM TYPE STRING,
PKPOS TYPE STRING,
KZLEI TYPE STRING,
KISTZ TYPE STRING,
KISTP TYPE STRING,
PERNR TYPE STRING,
SOLWM TYPE STRING,
SOLEX TYPE STRING,
ISTWM TYPE STRING,
ZEIEI TYPE STRING,
HRSTS TYPE STRING,
STDAT TYPE STRING,
ENDAT TYPE STRING,
STUZT TYPE STRING,
ENUZT TYPE STRING,
L2SKA TYPE STRING,
MINWM TYPE STRING,
LGTOR TYPE STRING,
LGBZO TYPE STRING,
KZVEP TYPE STRING,
SWABW TYPE STRING,
AUSFB TYPE STRING,
SPEZI TYPE STRING,
VBTYP TYPE STRING,
QUEUE TYPE STRING,
KGVNQ TYPE STRING,
TAPRI TYPE STRING,
KVQUI TYPE STRING,
HUCON TYPE STRING,
NOITM TYPE STRING,
KZTRM TYPE STRING,
LATER TYPE STRING,
PASSD TYPE STRING,
MULTL TYPE STRING,
LFDAT TYPE STRING,
LFUHR TYPE STRING,END OF T_EKKO_STR.
DATA: WA_LTAK_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_LTAK_STR-MANDT sy-vline 
WA_LTAK_STR-LGNUM sy-vline 
WA_LTAK_STR-TANUM sy-vline 
WA_LTAK_STR-BWART sy-vline 
WA_LTAK_STR-BWLVS sy-vline 
WA_LTAK_STR-TBPRI sy-vline 
WA_LTAK_STR-TRART sy-vline 
WA_LTAK_STR-BDATU sy-vline 
WA_LTAK_STR-BZEIT sy-vline 
WA_LTAK_STR-BNAME sy-vline 
WA_LTAK_STR-REFNR sy-vline 
WA_LTAK_STR-TBNUM sy-vline 
WA_LTAK_STR-UBNUM sy-vline 
WA_LTAK_STR-VBELN sy-vline 
WA_LTAK_STR-KQUIT sy-vline 
WA_LTAK_STR-QDATU sy-vline 
WA_LTAK_STR-MBLNR sy-vline 
WA_LTAK_STR-MJAHR sy-vline 
WA_LTAK_STR-BETYP sy-vline 
WA_LTAK_STR-BENUM sy-vline 
WA_LTAK_STR-DRUKZ sy-vline 
WA_LTAK_STR-DRUCK sy-vline 
WA_LTAK_STR-TEILK sy-vline 
WA_LTAK_STR-KR2SO sy-vline 
WA_LTAK_STR-KR2KU sy-vline 
WA_LTAK_STR-KDISO sy-vline 
WA_LTAK_STR-KZPLA sy-vline 
WA_LTAK_STR-PLDAT sy-vline 
WA_LTAK_STR-RSNUM sy-vline 
WA_LTAK_STR-LZNUM sy-vline 
WA_LTAK_STR-BDART sy-vline 
WA_LTAK_STR-PKNUM sy-vline 
WA_LTAK_STR-PKPOS sy-vline 
WA_LTAK_STR-KZLEI sy-vline 
WA_LTAK_STR-KISTZ sy-vline 
WA_LTAK_STR-KISTP sy-vline 
WA_LTAK_STR-PERNR sy-vline 
WA_LTAK_STR-SOLWM sy-vline 
WA_LTAK_STR-SOLEX sy-vline 
WA_LTAK_STR-ISTWM sy-vline 
WA_LTAK_STR-ZEIEI sy-vline 
WA_LTAK_STR-HRSTS sy-vline 
WA_LTAK_STR-STDAT sy-vline 
WA_LTAK_STR-ENDAT sy-vline 
WA_LTAK_STR-STUZT sy-vline 
WA_LTAK_STR-ENUZT sy-vline 
WA_LTAK_STR-L2SKA sy-vline 
WA_LTAK_STR-MINWM sy-vline 
WA_LTAK_STR-LGTOR sy-vline 
WA_LTAK_STR-LGBZO sy-vline 
WA_LTAK_STR-KZVEP sy-vline 
WA_LTAK_STR-SWABW sy-vline 
WA_LTAK_STR-AUSFB sy-vline 
WA_LTAK_STR-SPEZI sy-vline 
WA_LTAK_STR-VBTYP sy-vline 
WA_LTAK_STR-QUEUE sy-vline 
WA_LTAK_STR-KGVNQ sy-vline 
WA_LTAK_STR-TAPRI sy-vline 
WA_LTAK_STR-KVQUI sy-vline 
WA_LTAK_STR-HUCON sy-vline 
WA_LTAK_STR-NOITM sy-vline 
WA_LTAK_STR-KZTRM sy-vline 
WA_LTAK_STR-LATER sy-vline 
WA_LTAK_STR-PASSD sy-vline 
WA_LTAK_STR-MULTL sy-vline 
WA_LTAK_STR-LFDAT sy-vline 
WA_LTAK_STR-LFUHR sy-vline      INTO ld_text SEPARATED BY SPACE.

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