ABAP Select data from SAP table ALMTTREE into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM ALMTTREE
*  INTO TABLE @DATA(IT_ALMTTREE2).
*--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_ALMTTREE INDEX 1 INTO DATA(WA_ALMTTREE2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<ALMTTREE>-MTSYSID = 1.
<ALMTTREE>-MTMCNAME = 1.
<ALMTTREE>-MTNUMRANGE = 1.
<ALMTTREE>-MTUID = 1.
<ALMTTREE>-MTCLASS = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_ALMTTREE-MTINDEX, sy-vline,
  WA_ALMTTREE-EXTINDEX, sy-vline,
  WA_ALMTTREE-ALTREENUM, sy-vline,
  WA_ALMTTREE-ALIDXINTRE, sy-vline,
  WA_ALMTTREE-ALLEVINTRE, sy-vline,
  WA_ALMTTREE-ALPARINTRE, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_ALMTTREE 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_ALMTTREE 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_ALMTTREE INTO WA_ALMTTREE.


*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.
ENDFORM. 

*&---------------------------------------------------------------------*
*& Form process_as_string_field_values
*&---------------------------------------------------------------------*
FORM process_as_string_field_values CHANGING p_EKKO LIKE wa_EKKO.

TYPES: BEGIN OF T_ALMTTREE_STR, 
MTSYSID TYPE STRING,
MTMCNAME TYPE STRING,
MTNUMRANGE TYPE STRING,
MTUID TYPE STRING,
MTCLASS TYPE STRING,
MTINDEX TYPE STRING,
EXTINDEX TYPE STRING,
ALTREENUM TYPE STRING,
ALIDXINTRE TYPE STRING,
ALLEVINTRE TYPE STRING,
ALPARINTRE TYPE STRING,
OBJECTNAME TYPE STRING,
MTNAMESHRT TYPE STRING,
DELIVERSTA TYPE STRING,
HIGHALVAL TYPE STRING,
HIGHALSEV TYPE STRING,
ALSYSID TYPE STRING,
MSEGNAME TYPE STRING,
ALUNIQNUM TYPE STRING,
ALINDEX TYPE STRING,
ALERTDATE TYPE STRING,
ALERTTIME TYPE STRING,
DUMMYALIGN TYPE STRING,
LASTVALDAT TYPE STRING,
LASTVALTIM TYPE STRING,
LASTVALDUM TYPE STRING,
ACTUALVAL TYPE STRING,
ACTUALSEV TYPE STRING,
VALSYSID TYPE STRING,
VMSEGNAME TYPE STRING,
VALUNIQNUM TYPE STRING,
VALINDEX TYPE STRING,
VALERTDATE TYPE STRING,
VALERTTIME TYPE STRING,
VALERTDUM TYPE STRING,
COUNTOFACT TYPE STRING,
COUNTSUM TYPE STRING,
VISUSERLEV TYPE STRING,
TDSTATUS TYPE STRING,
RC TYPE STRING,END OF T_EKKO_STR.
DATA: WA_ALMTTREE_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_ALMTTREE_STR-MTSYSID sy-vline 
WA_ALMTTREE_STR-MTMCNAME sy-vline 
WA_ALMTTREE_STR-MTNUMRANGE sy-vline 
WA_ALMTTREE_STR-MTUID sy-vline 
WA_ALMTTREE_STR-MTCLASS sy-vline 
WA_ALMTTREE_STR-MTINDEX sy-vline 
WA_ALMTTREE_STR-EXTINDEX sy-vline 
WA_ALMTTREE_STR-ALTREENUM sy-vline 
WA_ALMTTREE_STR-ALIDXINTRE sy-vline 
WA_ALMTTREE_STR-ALLEVINTRE sy-vline 
WA_ALMTTREE_STR-ALPARINTRE sy-vline 
WA_ALMTTREE_STR-OBJECTNAME sy-vline 
WA_ALMTTREE_STR-MTNAMESHRT sy-vline 
WA_ALMTTREE_STR-DELIVERSTA sy-vline 
WA_ALMTTREE_STR-HIGHALVAL sy-vline 
WA_ALMTTREE_STR-HIGHALSEV sy-vline 
WA_ALMTTREE_STR-ALSYSID sy-vline 
WA_ALMTTREE_STR-MSEGNAME sy-vline 
WA_ALMTTREE_STR-ALUNIQNUM sy-vline 
WA_ALMTTREE_STR-ALINDEX sy-vline 
WA_ALMTTREE_STR-ALERTDATE sy-vline 
WA_ALMTTREE_STR-ALERTTIME sy-vline 
WA_ALMTTREE_STR-DUMMYALIGN sy-vline 
WA_ALMTTREE_STR-LASTVALDAT sy-vline 
WA_ALMTTREE_STR-LASTVALTIM sy-vline 
WA_ALMTTREE_STR-LASTVALDUM sy-vline 
WA_ALMTTREE_STR-ACTUALVAL sy-vline 
WA_ALMTTREE_STR-ACTUALSEV sy-vline 
WA_ALMTTREE_STR-VALSYSID sy-vline 
WA_ALMTTREE_STR-VMSEGNAME sy-vline 
WA_ALMTTREE_STR-VALUNIQNUM sy-vline 
WA_ALMTTREE_STR-VALINDEX sy-vline 
WA_ALMTTREE_STR-VALERTDATE sy-vline 
WA_ALMTTREE_STR-VALERTTIME sy-vline 
WA_ALMTTREE_STR-VALERTDUM sy-vline 
WA_ALMTTREE_STR-COUNTOFACT sy-vline 
WA_ALMTTREE_STR-COUNTSUM sy-vline 
WA_ALMTTREE_STR-VISUSERLEV sy-vline 
WA_ALMTTREE_STR-TDSTATUS sy-vline 
WA_ALMTTREE_STR-RC sy-vline      INTO ld_text SEPARATED BY SPACE.

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