ABAP Select data from SAP table MALG_STRUC into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM MALG_STRUC
*  INTO TABLE @DATA(IT_MALG_STRUC2).
*--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_MALG_STRUC INDEX 1 INTO DATA(WA_MALG_STRUC2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<MALG_STRUC>-MATNR = 1.
<MALG_STRUC>-MEINH = 1.
<MALG_STRUC>-LAYGR = 1.
<MALG_STRUC>-LMNUM = 1.
<MALG_STRUC>-SORF1 = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_MALG_STRUC-HPLGR, sy-vline,
  WA_MALG_STRUC-FACIN, sy-vline,
  WA_MALG_STRUC-SHELF, sy-vline,
  WA_MALG_STRUC-LMVER, sy-vline,
  WA_MALG_STRUC-FRONT, sy-vline,
  WA_MALG_STRUC-SHQNM, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_MALG_STRUC 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_MALG_STRUC 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_MALG_STRUC INTO WA_MALG_STRUC.


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

*Conversion exit CUNIT, internal->external for field MEINH
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_MALG_STRUC-MEINH
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MALG_STRUC-MEINH.
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_MALG_STRUC_STR, 
MATNR TYPE STRING,
MEINH TYPE STRING,
LAYGR TYPE STRING,
LMNUM TYPE STRING,
SORF1 TYPE STRING,
HPLGR TYPE STRING,
FACIN TYPE STRING,
SHELF TYPE STRING,
LMVER TYPE STRING,
FRONT TYPE STRING,
SHQNM TYPE STRING,
SHQNO TYPE STRING,
PREQN TYPE STRING,
EXFLG TYPE STRING,
LMVAR TYPE STRING,
CHANGE TYPE STRING,END OF T_EKKO_STR.
DATA: WA_MALG_STRUC_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_MALG_STRUC_STR-MATNR sy-vline 
WA_MALG_STRUC_STR-MEINH sy-vline 
WA_MALG_STRUC_STR-LAYGR sy-vline 
WA_MALG_STRUC_STR-LMNUM sy-vline 
WA_MALG_STRUC_STR-SORF1 sy-vline 
WA_MALG_STRUC_STR-HPLGR sy-vline 
WA_MALG_STRUC_STR-FACIN sy-vline 
WA_MALG_STRUC_STR-SHELF sy-vline 
WA_MALG_STRUC_STR-LMVER sy-vline 
WA_MALG_STRUC_STR-FRONT sy-vline 
WA_MALG_STRUC_STR-SHQNM sy-vline 
WA_MALG_STRUC_STR-SHQNO sy-vline 
WA_MALG_STRUC_STR-PREQN sy-vline 
WA_MALG_STRUC_STR-EXFLG sy-vline 
WA_MALG_STRUC_STR-LMVAR sy-vline 
WA_MALG_STRUC_STR-CHANGE sy-vline      INTO ld_text SEPARATED BY SPACE.

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