ABAP Select data from SAP table MSLBU into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM MSLBU
*  INTO TABLE @DATA(IT_MSLBU2).
*--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_MSLBU INDEX 1 INTO DATA(WA_MSLBU2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<MSLBU>-MANDT = 1.
<MSLBU>-MATNR = 1.
<MSLBU>-WERKS = 1.
<MSLBU>-CHARG = 1.
<MSLBU>-SOBKZ = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_MSLBU-LIFNR, sy-vline,
  WA_MSLBU-LFGJA, sy-vline,
  WA_MSLBU-LFMON, sy-vline,
  WA_MSLBU-LBSPR, sy-vline,
  WA_MSLBU-LBLAB, sy-vline,
  WA_MSLBU-LBINS, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_MSLBU 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_MSLBU 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_MSLBU INTO WA_MSLBU.


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

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

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

*Conversion exit GJAHR, internal->external for field LBJIN
CALL FUNCTION 'CONVERSION_EXIT_GJAHR_OUTPUT'
  EXPORTING
    input =                      WA_MSLBU-LBJIN
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MSLBU-LBJIN.
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_MSLBU_STR, 
MANDT TYPE STRING,
MATNR TYPE STRING,
WERKS TYPE STRING,
CHARG TYPE STRING,
SOBKZ TYPE STRING,
LIFNR TYPE STRING,
LFGJA TYPE STRING,
LFMON TYPE STRING,
LBSPR TYPE STRING,
LBLAB TYPE STRING,
LBINS TYPE STRING,
LBVLA TYPE STRING,
LBVIN TYPE STRING,
LBILL TYPE STRING,
LBILQ TYPE STRING,
LBVLL TYPE STRING,
LBVLQ TYPE STRING,
LBFLL TYPE STRING,
LBFLQ TYPE STRING,
LBDLL TYPE STRING,
LBEIN TYPE STRING,
LBVEI TYPE STRING,
ERSDA TYPE STRING,
LBJIN TYPE STRING,
LBRUE TYPE STRING,
LBUML TYPE STRING,
SGT_SCAT TYPE STRING,
/CWM/LBLAB TYPE STRING,
/CWM/LBINS TYPE STRING,
/CWM/LBEIN TYPE STRING,
/CWM/LBUML TYPE STRING,
/CWM/LBVLA TYPE STRING,
/CWM/LBVIN TYPE STRING,
/CWM/LBVEI TYPE STRING,END OF T_EKKO_STR.
DATA: WA_MSLBU_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_MSLBU_STR-MANDT sy-vline 
WA_MSLBU_STR-MATNR sy-vline 
WA_MSLBU_STR-WERKS sy-vline 
WA_MSLBU_STR-CHARG sy-vline 
WA_MSLBU_STR-SOBKZ sy-vline 
WA_MSLBU_STR-LIFNR sy-vline 
WA_MSLBU_STR-LFGJA sy-vline 
WA_MSLBU_STR-LFMON sy-vline 
WA_MSLBU_STR-LBSPR sy-vline 
WA_MSLBU_STR-LBLAB sy-vline 
WA_MSLBU_STR-LBINS sy-vline 
WA_MSLBU_STR-LBVLA sy-vline 
WA_MSLBU_STR-LBVIN sy-vline 
WA_MSLBU_STR-LBILL sy-vline 
WA_MSLBU_STR-LBILQ sy-vline 
WA_MSLBU_STR-LBVLL sy-vline 
WA_MSLBU_STR-LBVLQ sy-vline 
WA_MSLBU_STR-LBFLL sy-vline 
WA_MSLBU_STR-LBFLQ sy-vline 
WA_MSLBU_STR-LBDLL sy-vline 
WA_MSLBU_STR-LBEIN sy-vline 
WA_MSLBU_STR-LBVEI sy-vline 
WA_MSLBU_STR-ERSDA sy-vline 
WA_MSLBU_STR-LBJIN sy-vline 
WA_MSLBU_STR-LBRUE sy-vline 
WA_MSLBU_STR-LBUML sy-vline 
WA_MSLBU_STR-SGT_SCAT sy-vline 
WA_MSLBU_STR-/CWM/LBLAB sy-vline 
WA_MSLBU_STR-/CWM/LBINS sy-vline 
WA_MSLBU_STR-/CWM/LBEIN sy-vline 
WA_MSLBU_STR-/CWM/LBUML sy-vline 
WA_MSLBU_STR-/CWM/LBVLA sy-vline 
WA_MSLBU_STR-/CWM/LBVIN sy-vline 
WA_MSLBU_STR-/CWM/LBVEI sy-vline      INTO ld_text SEPARATED BY SPACE.

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