ABAP Select data from SAP table LAGOF into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM LAGOF
*  INTO TABLE @DATA(IT_LAGOF2).
*--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_LAGOF INDEX 1 INTO DATA(WA_LAGOF2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<LAGOF>-VSTEL = 1.
<LAGOF>-WERKS = 1.
<LAGOF>-RAUBE = 1.
<LAGOF>-SITUA = 1.
<LAGOF>-AUREL = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_LAGOF-AKTNR, sy-vline,
  WA_LAGOF-EALKZ, sy-vline,
  WA_LAGOF-VKORG, sy-vline,
  WA_LAGOF-VTWEG, sy-vline,
  WA_LAGOF-SPART, sy-vline,
  WA_LAGOF-MATNR, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_LAGOF 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_LAGOF 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_LAGOF INTO WA_LAGOF.


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

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

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

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

*Conversion exit CUNIT, internal->external for field VRKME
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_LAGOF-VRKME
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_LAGOF-VRKME.
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_LAGOF_STR, 
VSTEL TYPE STRING,
WERKS TYPE STRING,
RAUBE TYPE STRING,
SITUA TYPE STRING,
AUREL TYPE STRING,
AKTNR TYPE STRING,
EALKZ TYPE STRING,
VKORG TYPE STRING,
VTWEG TYPE STRING,
SPART TYPE STRING,
MATNR TYPE STRING,
TEMPB TYPE STRING,
MATKL TYPE STRING,
TRAGR TYPE STRING,
LADGR TYPE STRING,
DISKZ TYPE STRING,
LPRIO TYPE STRING,
VSBED TYPE STRING,
LFART TYPE STRING,
REGLG TYPE STRING,
BWTAR TYPE STRING,
CHARG TYPE STRING,
BERID TYPE STRING,
KUNNR TYPE STRING,
KVGR1 TYPE STRING,
VKGRP TYPE STRING,
VGBEL TYPE STRING,
VGPOS TYPE STRING,
VGTYP TYPE STRING,
PSTYV TYPE STRING,
LGORT TYPE STRING,
SOBKZ TYPE STRING,
LFIMG TYPE STRING,
VRKME TYPE STRING,
MSR_ACTIVE TYPE STRING,
MSR_VBTYP TYPE STRING,END OF T_EKKO_STR.
DATA: WA_LAGOF_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_LAGOF_STR-VSTEL sy-vline 
WA_LAGOF_STR-WERKS sy-vline 
WA_LAGOF_STR-RAUBE sy-vline 
WA_LAGOF_STR-SITUA sy-vline 
WA_LAGOF_STR-AUREL sy-vline 
WA_LAGOF_STR-AKTNR sy-vline 
WA_LAGOF_STR-EALKZ sy-vline 
WA_LAGOF_STR-VKORG sy-vline 
WA_LAGOF_STR-VTWEG sy-vline 
WA_LAGOF_STR-SPART sy-vline 
WA_LAGOF_STR-MATNR sy-vline 
WA_LAGOF_STR-TEMPB sy-vline 
WA_LAGOF_STR-MATKL sy-vline 
WA_LAGOF_STR-TRAGR sy-vline 
WA_LAGOF_STR-LADGR sy-vline 
WA_LAGOF_STR-DISKZ sy-vline 
WA_LAGOF_STR-LPRIO sy-vline 
WA_LAGOF_STR-VSBED sy-vline 
WA_LAGOF_STR-LFART sy-vline 
WA_LAGOF_STR-REGLG sy-vline 
WA_LAGOF_STR-BWTAR sy-vline 
WA_LAGOF_STR-CHARG sy-vline 
WA_LAGOF_STR-BERID sy-vline 
WA_LAGOF_STR-KUNNR sy-vline 
WA_LAGOF_STR-KVGR1 sy-vline 
WA_LAGOF_STR-VKGRP sy-vline 
WA_LAGOF_STR-VGBEL sy-vline 
WA_LAGOF_STR-VGPOS sy-vline 
WA_LAGOF_STR-VGTYP sy-vline 
WA_LAGOF_STR-PSTYV sy-vline 
WA_LAGOF_STR-LGORT sy-vline 
WA_LAGOF_STR-SOBKZ sy-vline 
WA_LAGOF_STR-LFIMG sy-vline 
WA_LAGOF_STR-VRKME sy-vline 
WA_LAGOF_STR-MSR_ACTIVE sy-vline 
WA_LAGOF_STR-MSR_VBTYP sy-vline      INTO ld_text SEPARATED BY SPACE.

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