ABAP Select data from SAP table BGMP into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM BGMP
*  INTO TABLE @DATA(IT_BGMP2).
*--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_BGMP INDEX 1 INTO DATA(WA_BGMP2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<BGMP>-MANDT = 1.
<BGMP>-MGANR = 1.
<BGMP>-POSNM = 1.
<BGMP>-POSTY = 1.
<BGMP>-PSART = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_BGMP-LSTNR, sy-vline,
  WA_BGMP-KZITX, sy-vline,
  WA_BGMP-HPOSN, sy-vline,
  WA_BGMP-INEXCL, sy-vline,
  WA_BGMP-AKTIV, sy-vline,
  WA_BGMP-MENGE, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_BGMP 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_BGMP 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_BGMP INTO WA_BGMP.


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

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

*Conversion exit CUNIT, internal->external for field MSEHI
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_BGMP-MSEHI
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_BGMP-MSEHI.
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_BGMP_STR, 
MANDT TYPE STRING,
MGANR TYPE STRING,
POSNM TYPE STRING,
POSTY TYPE STRING,
PSART TYPE STRING,
LSTNR TYPE STRING,
KZITX TYPE STRING,
HPOSN TYPE STRING,
INEXCL TYPE STRING,
AKTIV TYPE STRING,
MENGE TYPE STRING,
MSEHI TYPE STRING,
DECIM TYPE STRING,
EXPON TYPE STRING,
ATVOR TYPE STRING,
ATDIM TYPE STRING,
ANZDZ TYPE STRING,
VGLZA TYPE STRING,
LVORM TYPE STRING,
CUOBJ TYPE STRING,
SORTF TYPE STRING,
DATUV TYPE STRING,END OF T_EKKO_STR.
DATA: WA_BGMP_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_BGMP_STR-MANDT sy-vline 
WA_BGMP_STR-MGANR sy-vline 
WA_BGMP_STR-POSNM sy-vline 
WA_BGMP_STR-POSTY sy-vline 
WA_BGMP_STR-PSART sy-vline 
WA_BGMP_STR-LSTNR sy-vline 
WA_BGMP_STR-KZITX sy-vline 
WA_BGMP_STR-HPOSN sy-vline 
WA_BGMP_STR-INEXCL sy-vline 
WA_BGMP_STR-AKTIV sy-vline 
WA_BGMP_STR-MENGE sy-vline 
WA_BGMP_STR-MSEHI sy-vline 
WA_BGMP_STR-DECIM sy-vline 
WA_BGMP_STR-EXPON sy-vline 
WA_BGMP_STR-ATVOR sy-vline 
WA_BGMP_STR-ATDIM sy-vline 
WA_BGMP_STR-ANZDZ sy-vline 
WA_BGMP_STR-VGLZA sy-vline 
WA_BGMP_STR-LVORM sy-vline 
WA_BGMP_STR-CUOBJ sy-vline 
WA_BGMP_STR-SORTF sy-vline 
WA_BGMP_STR-DATUV sy-vline      INTO ld_text SEPARATED BY SPACE.

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