ABAP Select data from SAP table LWMSM_LTAP into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM LWMSM_LTAP
*  INTO TABLE @DATA(IT_LWMSM_LTAP2).
*--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_LWMSM_LTAP INDEX 1 INTO DATA(WA_LWMSM_LTAP2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<LWMSM_LTAP>-LGNUM = 1.
<LWMSM_LTAP>-TANUM = 1.
<LWMSM_LTAP>-TAPOS = 1.
<LWMSM_LTAP>-POSNR = 1.
<LWMSM_LTAP>-MATNR = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_LWMSM_LTAP-LETYP, sy-vline,
  WA_LWMSM_LTAP-PQUIT, sy-vline,
  WA_LWMSM_LTAP-QDATU, sy-vline,
  WA_LWMSM_LTAP-QZEIT, sy-vline,
  WA_LWMSM_LTAP-QNAME, sy-vline,
  WA_LWMSM_LTAP-BRGEW, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_LWMSM_LTAP 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_LWMSM_LTAP 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_LWMSM_LTAP INTO WA_LWMSM_LTAP.


*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 MATN1, internal->external for field MATNR
CALL FUNCTION 'CONVERSION_EXIT_MATN1_OUTPUT'
  EXPORTING
    input =                      WA_LWMSM_LTAP-MATNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_LWMSM_LTAP-MATNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit MODAT, internal->external for field QDATU
CALL FUNCTION 'CONVERSION_EXIT_MODAT_OUTPUT'
  EXPORTING
    input =                      WA_LWMSM_LTAP-QDATU
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_LWMSM_LTAP-QDATU.
WRITE:/ 'New Value:', ld_input.

*Conversion exit TIMLO, internal->external for field QZEIT
CALL FUNCTION 'CONVERSION_EXIT_TIMLO_OUTPUT'
  EXPORTING
    input =                      WA_LWMSM_LTAP-QZEIT
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_LWMSM_LTAP-QZEIT.
WRITE:/ 'New Value:', ld_input.

*Conversion exit CUNIT, internal->external for field GEWEI
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_LWMSM_LTAP-GEWEI
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_LWMSM_LTAP-GEWEI.
WRITE:/ 'New Value:', ld_input.

*Conversion exit LENUM, internal->external for field VLENR
CALL FUNCTION 'CONVERSION_EXIT_LENUM_OUTPUT'
  EXPORTING
    input =                      WA_LWMSM_LTAP-VLENR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_LWMSM_LTAP-VLENR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit LENUM, internal->external for field NLENR
CALL FUNCTION 'CONVERSION_EXIT_LENUM_OUTPUT'
  EXPORTING
    input =                      WA_LWMSM_LTAP-NLENR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_LWMSM_LTAP-NLENR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit MODAT, internal->external for field VFDAT
CALL FUNCTION 'CONVERSION_EXIT_MODAT_OUTPUT'
  EXPORTING
    input =                      WA_LWMSM_LTAP-VFDAT
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_LWMSM_LTAP-VFDAT.
WRITE:/ 'New Value:', ld_input.

*Conversion exit CUNIT, internal->external for field ZEIEI
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_LWMSM_LTAP-ZEIEI
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_LWMSM_LTAP-ZEIEI.
WRITE:/ 'New Value:', ld_input.

*Conversion exit MODAT, internal->external for field EDATU
CALL FUNCTION 'CONVERSION_EXIT_MODAT_OUTPUT'
  EXPORTING
    input =                      WA_LWMSM_LTAP-EDATU
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_LWMSM_LTAP-EDATU.
WRITE:/ 'New Value:', ld_input.

*Conversion exit TIMLO, internal->external for field EZEIT
CALL FUNCTION 'CONVERSION_EXIT_TIMLO_OUTPUT'
  EXPORTING
    input =                      WA_LWMSM_LTAP-EZEIT
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_LWMSM_LTAP-EZEIT.
WRITE:/ 'New Value:', ld_input.

*Conversion exit MATN1, internal->external for field VHILM
CALL FUNCTION 'CONVERSION_EXIT_MATN1_OUTPUT'
  EXPORTING
    input =                      WA_LWMSM_LTAP-VHILM
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_LWMSM_LTAP-VHILM.
WRITE:/ 'New Value:', ld_input.

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

*Conversion exit CUNIT, internal->external for field ALTME
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_LWMSM_LTAP-ALTME
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_LWMSM_LTAP-ALTME.
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_LWMSM_LTAP_STR, 
LGNUM TYPE STRING,
TANUM TYPE STRING,
TAPOS TYPE STRING,
POSNR TYPE STRING,
MATNR TYPE STRING,
LETYP TYPE STRING,
PQUIT TYPE STRING,
QDATU TYPE STRING,
QZEIT TYPE STRING,
QNAME TYPE STRING,
BRGEW TYPE STRING,
GEWEI TYPE STRING,
ABLAD TYPE STRING,
VLTYP TYPE STRING,
VLBER TYPE STRING,
VLPLA TYPE STRING,
VKDYN TYPE STRING,
VPPOS TYPE STRING,
NLTYP TYPE STRING,
NLBER TYPE STRING,
NLPLA TYPE STRING,
NKDYN TYPE STRING,
NPPOS TYPE STRING,
MAKTX TYPE STRING,
VLENR TYPE STRING,
NLENR TYPE STRING,
VFDAT TYPE STRING,
SOLPO TYPE STRING,
ZEIEI TYPE STRING,
PVQUI TYPE STRING,
EDATU TYPE STRING,
EZEIT TYPE STRING,
FHUTA TYPE STRING,
VHILM TYPE STRING,
VBELN TYPE STRING,
VSOLA TYPE STRING,
VISTA TYPE STRING,
NSOLA TYPE STRING,
NISTA TYPE STRING,
ALTME TYPE STRING,END OF T_EKKO_STR.
DATA: WA_LWMSM_LTAP_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_LWMSM_LTAP_STR-LGNUM sy-vline 
WA_LWMSM_LTAP_STR-TANUM sy-vline 
WA_LWMSM_LTAP_STR-TAPOS sy-vline 
WA_LWMSM_LTAP_STR-POSNR sy-vline 
WA_LWMSM_LTAP_STR-MATNR sy-vline 
WA_LWMSM_LTAP_STR-LETYP sy-vline 
WA_LWMSM_LTAP_STR-PQUIT sy-vline 
WA_LWMSM_LTAP_STR-QDATU sy-vline 
WA_LWMSM_LTAP_STR-QZEIT sy-vline 
WA_LWMSM_LTAP_STR-QNAME sy-vline 
WA_LWMSM_LTAP_STR-BRGEW sy-vline 
WA_LWMSM_LTAP_STR-GEWEI sy-vline 
WA_LWMSM_LTAP_STR-ABLAD sy-vline 
WA_LWMSM_LTAP_STR-VLTYP sy-vline 
WA_LWMSM_LTAP_STR-VLBER sy-vline 
WA_LWMSM_LTAP_STR-VLPLA sy-vline 
WA_LWMSM_LTAP_STR-VKDYN sy-vline 
WA_LWMSM_LTAP_STR-VPPOS sy-vline 
WA_LWMSM_LTAP_STR-NLTYP sy-vline 
WA_LWMSM_LTAP_STR-NLBER sy-vline 
WA_LWMSM_LTAP_STR-NLPLA sy-vline 
WA_LWMSM_LTAP_STR-NKDYN sy-vline 
WA_LWMSM_LTAP_STR-NPPOS sy-vline 
WA_LWMSM_LTAP_STR-MAKTX sy-vline 
WA_LWMSM_LTAP_STR-VLENR sy-vline 
WA_LWMSM_LTAP_STR-NLENR sy-vline 
WA_LWMSM_LTAP_STR-VFDAT sy-vline 
WA_LWMSM_LTAP_STR-SOLPO sy-vline 
WA_LWMSM_LTAP_STR-ZEIEI sy-vline 
WA_LWMSM_LTAP_STR-PVQUI sy-vline 
WA_LWMSM_LTAP_STR-EDATU sy-vline 
WA_LWMSM_LTAP_STR-EZEIT sy-vline 
WA_LWMSM_LTAP_STR-FHUTA sy-vline 
WA_LWMSM_LTAP_STR-VHILM sy-vline 
WA_LWMSM_LTAP_STR-VBELN sy-vline 
WA_LWMSM_LTAP_STR-VSOLA sy-vline 
WA_LWMSM_LTAP_STR-VISTA sy-vline 
WA_LWMSM_LTAP_STR-NSOLA sy-vline 
WA_LWMSM_LTAP_STR-NISTA sy-vline 
WA_LWMSM_LTAP_STR-ALTME sy-vline      INTO ld_text SEPARATED BY SPACE.

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