ABAP Select data from SAP table LSEG into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM LSEG
*  INTO TABLE @DATA(IT_LSEG2).
*--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_LSEG INDEX 1 INTO DATA(WA_LSEG2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<LSEG>-MANDT = 1.
<LSEG>-LGNUM = 1.
<LSEG>-LBELN = 1.
<LSEG>-LBPOS = 1.
<LSEG>-MATNR = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_LSEG-WERKS, sy-vline,
  WA_LSEG-LGORT, sy-vline,
  WA_LSEG-CHARG, sy-vline,
  WA_LSEG-BESTQ, sy-vline,
  WA_LSEG-SOBKZ, sy-vline,
  WA_LSEG-SONUM, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_LSEG 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_LSEG 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_LSEG INTO WA_LSEG.


*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_LSEG-MATNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_LSEG-MATNR.
WRITE:/ 'New Value:', ld_input.

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

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

*Conversion exit LENUM, internal->external for field LENUM
CALL FUNCTION 'CONVERSION_EXIT_LENUM_OUTPUT'
  EXPORTING
    input =                      WA_LSEG-LENUM
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_LSEG-LENUM.
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_LSEG_STR, 
MANDT TYPE STRING,
LGNUM TYPE STRING,
LBELN TYPE STRING,
LBPOS TYPE STRING,
MATNR TYPE STRING,
WERKS TYPE STRING,
LGORT TYPE STRING,
CHARG TYPE STRING,
BESTQ TYPE STRING,
SOBKZ TYPE STRING,
SONUM TYPE STRING,
MENGE TYPE STRING,
MEINS TYPE STRING,
LGTYP TYPE STRING,
LGPLA TYPE STRING,
BWART TYPE STRING,
BDATU TYPE STRING,
BZEIT TYPE STRING,
LVBTP TYPE STRING,
LVBNR TYPE STRING,
LVBPS TYPE STRING,
LENUM TYPE STRING,
LETYP TYPE STRING,
XHUPF TYPE STRING,
NOSTK TYPE STRING,
ERNAM TYPE STRING,
SGT_SCAT TYPE STRING,END OF T_EKKO_STR.
DATA: WA_LSEG_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_LSEG_STR-MANDT sy-vline 
WA_LSEG_STR-LGNUM sy-vline 
WA_LSEG_STR-LBELN sy-vline 
WA_LSEG_STR-LBPOS sy-vline 
WA_LSEG_STR-MATNR sy-vline 
WA_LSEG_STR-WERKS sy-vline 
WA_LSEG_STR-LGORT sy-vline 
WA_LSEG_STR-CHARG sy-vline 
WA_LSEG_STR-BESTQ sy-vline 
WA_LSEG_STR-SOBKZ sy-vline 
WA_LSEG_STR-SONUM sy-vline 
WA_LSEG_STR-MENGE sy-vline 
WA_LSEG_STR-MEINS sy-vline 
WA_LSEG_STR-LGTYP sy-vline 
WA_LSEG_STR-LGPLA sy-vline 
WA_LSEG_STR-BWART sy-vline 
WA_LSEG_STR-BDATU sy-vline 
WA_LSEG_STR-BZEIT sy-vline 
WA_LSEG_STR-LVBTP sy-vline 
WA_LSEG_STR-LVBNR sy-vline 
WA_LSEG_STR-LVBPS sy-vline 
WA_LSEG_STR-LENUM sy-vline 
WA_LSEG_STR-LETYP sy-vline 
WA_LSEG_STR-XHUPF sy-vline 
WA_LSEG_STR-NOSTK sy-vline 
WA_LSEG_STR-ERNAM sy-vline 
WA_LSEG_STR-SGT_SCAT sy-vline      INTO ld_text SEPARATED BY SPACE.

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