ABAP Select data from SAP table LGEF1 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 LGEF1 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 LGEF1. 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 LGEF1 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_LGEF1 TYPE STANDARD TABLE OF LGEF1,
      WA_LGEF1 TYPE LGEF1,
      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: <LGEF1> TYPE LGEF1.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_LGEF1.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM LGEF1
  INTO TABLE IT_LGEF1.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM LGEF1
*  INTO TABLE @DATA(IT_LGEF12).
*--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_LGEF1 INDEX 1 INTO DATA(WA_LGEF12).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_LGEF1 ASSIGNING <LGEF1>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<LGEF1>-SUBID = 1.
<LGEF1>-QSTOFT = 1.
<LGEF1>-RECN = 1.
<LGEF1>-VACLID = 1.
<LGEF1>-RVLID = 1.

ENDLOOP.

LOOP AT IT_LGEF1 INTO WA_LGEF1.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_LGEF1-QLAGKL, sy-vline,
  WA_LGEF1-QWGFKL, sy-vline,
  WA_LGEF1-QWGKKZ, sy-vline,
  WA_LGEF1-QGFVM1, sy-vline,
  WA_LGEF1-QGFVM2, sy-vline,
  WA_LGEF1-QGFVM3, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_LGEF1 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_LGEF1 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_LGEF1 INTO WA_LGEF1.


*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 SPEC1, internal->external for field SUBID
CALL FUNCTION 'CONVERSION_EXIT_SPEC1_OUTPUT'
  EXPORTING
    input =                      WA_LGEF1-SUBID
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_LGEF1-SUBID.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field RECN
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_LGEF1-RECN
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_LGEF1-RECN.
WRITE:/ 'New Value:', ld_input.

*Conversion exit MATN3, internal->external for field STOFF
CALL FUNCTION 'CONVERSION_EXIT_MATN3_OUTPUT'
  EXPORTING
    input =                      WA_LGEF1-STOFF
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_LGEF1-STOFF.
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_LGEF1_STR, 
SUBID TYPE STRING,
QSTOFT TYPE STRING,
RECN TYPE STRING,
VACLID TYPE STRING,
RVLID TYPE STRING,
QLAGKL TYPE STRING,
QWGFKL TYPE STRING,
QWGKKZ TYPE STRING,
QGFVM1 TYPE STRING,
QGFVM2 TYPE STRING,
QGFVM3 TYPE STRING,
QGFVM4 TYPE STRING,
QGFVM5 TYPE STRING,
QGFVM6 TYPE STRING,
QGFVM7 TYPE STRING,
QGFVM8 TYPE STRING,
QLGFVM TYPE STRING,
QAGGRE TYPE STRING,
QVBFKL TYPE STRING,
SELFLG TYPE STRING,
STATUS TYPE STRING,
MANDT TYPE STRING,
STOFF TYPE STRING,
REGKZ TYPE STRING,
LAGKL TYPE STRING,
WGFKL TYPE STRING,
WGKKZ TYPE STRING,
GFVM1 TYPE STRING,
GFVM2 TYPE STRING,
GFVM3 TYPE STRING,
GFVM4 TYPE STRING,
GFVM5 TYPE STRING,
GFVM6 TYPE STRING,
GFVM7 TYPE STRING,
GFVM8 TYPE STRING,
SFNR1 TYPE STRING,
SFNR2 TYPE STRING,
SFNR3 TYPE STRING,
SFNR4 TYPE STRING,
SFKO1 TYPE STRING,
SFKO2 TYPE STRING,
SFKO3 TYPE STRING,
SFKO4 TYPE STRING,
FLAPU TYPE STRING,
SIDNR TYPE STRING,
SIVAR TYPE STRING,
SIVER TYPE STRING,
LGFVM TYPE STRING,
AGGRE TYPE STRING,
VBFKL TYPE STRING,
STOFT TYPE STRING,
STOKL TYPE STRING,
QFLAPU TYPE STRING,END OF T_EKKO_STR.
DATA: WA_LGEF1_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_LGEF1_STR-SUBID sy-vline 
WA_LGEF1_STR-QSTOFT sy-vline 
WA_LGEF1_STR-RECN sy-vline 
WA_LGEF1_STR-VACLID sy-vline 
WA_LGEF1_STR-RVLID sy-vline 
WA_LGEF1_STR-QLAGKL sy-vline 
WA_LGEF1_STR-QWGFKL sy-vline 
WA_LGEF1_STR-QWGKKZ sy-vline 
WA_LGEF1_STR-QGFVM1 sy-vline 
WA_LGEF1_STR-QGFVM2 sy-vline 
WA_LGEF1_STR-QGFVM3 sy-vline 
WA_LGEF1_STR-QGFVM4 sy-vline 
WA_LGEF1_STR-QGFVM5 sy-vline 
WA_LGEF1_STR-QGFVM6 sy-vline 
WA_LGEF1_STR-QGFVM7 sy-vline 
WA_LGEF1_STR-QGFVM8 sy-vline 
WA_LGEF1_STR-QLGFVM sy-vline 
WA_LGEF1_STR-QAGGRE sy-vline 
WA_LGEF1_STR-QVBFKL sy-vline 
WA_LGEF1_STR-SELFLG sy-vline 
WA_LGEF1_STR-STATUS sy-vline 
WA_LGEF1_STR-MANDT sy-vline 
WA_LGEF1_STR-STOFF sy-vline 
WA_LGEF1_STR-REGKZ sy-vline 
WA_LGEF1_STR-LAGKL sy-vline 
WA_LGEF1_STR-WGFKL sy-vline 
WA_LGEF1_STR-WGKKZ sy-vline 
WA_LGEF1_STR-GFVM1 sy-vline 
WA_LGEF1_STR-GFVM2 sy-vline 
WA_LGEF1_STR-GFVM3 sy-vline 
WA_LGEF1_STR-GFVM4 sy-vline 
WA_LGEF1_STR-GFVM5 sy-vline 
WA_LGEF1_STR-GFVM6 sy-vline 
WA_LGEF1_STR-GFVM7 sy-vline 
WA_LGEF1_STR-GFVM8 sy-vline 
WA_LGEF1_STR-SFNR1 sy-vline 
WA_LGEF1_STR-SFNR2 sy-vline 
WA_LGEF1_STR-SFNR3 sy-vline 
WA_LGEF1_STR-SFNR4 sy-vline 
WA_LGEF1_STR-SFKO1 sy-vline 
WA_LGEF1_STR-SFKO2 sy-vline 
WA_LGEF1_STR-SFKO3 sy-vline 
WA_LGEF1_STR-SFKO4 sy-vline 
WA_LGEF1_STR-FLAPU sy-vline 
WA_LGEF1_STR-SIDNR sy-vline 
WA_LGEF1_STR-SIVAR sy-vline 
WA_LGEF1_STR-SIVER sy-vline 
WA_LGEF1_STR-LGFVM sy-vline 
WA_LGEF1_STR-AGGRE sy-vline 
WA_LGEF1_STR-VBFKL sy-vline 
WA_LGEF1_STR-STOFT sy-vline 
WA_LGEF1_STR-STOKL sy-vline 
WA_LGEF1_STR-QFLAPU sy-vline      INTO ld_text SEPARATED BY SPACE.

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