ABAP Select data from SAP table ASMD_TREE into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM ASMD_TREE
*  INTO TABLE @DATA(IT_ASMD_TREE2).
*--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_ASMD_TREE INDEX 1 INTO DATA(WA_ASMD_TREE2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<ASMD_TREE>-ASNUM = 1.
<ASMD_TREE>-ASKTX = 1.
<ASMD_TREE>-ASTYP = 1.
<ASMD_TREE>-MEINS = 1.
<ASMD_TREE>-MATKL = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_ASMD_TREE-ERDAT, sy-vline,
  WA_ASMD_TREE-ERNAM, sy-vline,
  WA_ASMD_TREE-AEDAT, sy-vline,
  WA_ASMD_TREE-AENAM, sy-vline,
  WA_ASMD_TREE-LVORM, sy-vline,
  WA_ASMD_TREE-EAN11, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_ASMD_TREE 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_ASMD_TREE 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_ASMD_TREE INTO WA_ASMD_TREE.


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

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

*Conversion exit EAN11, internal->external for field EAN11
CALL FUNCTION 'CONVERSION_EXIT_EAN11_OUTPUT'
  EXPORTING
    input =                      WA_ASMD_TREE-EAN11
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_ASMD_TREE-EAN11.
WRITE:/ 'New Value:', ld_input.

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

*Conversion exit ISOLA, internal->external for field MLANG
CALL FUNCTION 'CONVERSION_EXIT_ISOLA_OUTPUT'
  EXPORTING
    input =                      WA_ASMD_TREE-MLANG
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_ASMD_TREE-MLANG.
WRITE:/ 'New Value:', ld_input.

*Conversion exit CUNIT, internal->external for field IWEIN
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_ASMD_TREE-IWEIN
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_ASMD_TREE-IWEIN.
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_ASMD_TREE_STR, 
ASNUM TYPE STRING,
ASKTX TYPE STRING,
ASTYP TYPE STRING,
MEINS TYPE STRING,
MATKL TYPE STRING,
ERDAT TYPE STRING,
ERNAM TYPE STRING,
AEDAT TYPE STRING,
AENAM TYPE STRING,
LVORM TYPE STRING,
EAN11 TYPE STRING,
NUMTP TYPE STRING,
SPART TYPE STRING,
BEGRU TYPE STRING,
MSTAE TYPE STRING,
MSTDE TYPE STRING,
BKLAS TYPE STRING,
LSTHI TYPE STRING,
MLANG TYPE STRING,
LGART TYPE STRING,
LBNUM TYPE STRING,
AUSGB TYPE STRING,
STLVPOS TYPE STRING,
TAXIM TYPE STRING,
IWUMZ TYPE STRING,
IWUMN TYPE STRING,
IWEIN TYPE STRING,
FORMELNR TYPE STRING,
CHGTEXT TYPE STRING,
IMAGE_URL TYPE STRING,END OF T_EKKO_STR.
DATA: WA_ASMD_TREE_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_ASMD_TREE_STR-ASNUM sy-vline 
WA_ASMD_TREE_STR-ASKTX sy-vline 
WA_ASMD_TREE_STR-ASTYP sy-vline 
WA_ASMD_TREE_STR-MEINS sy-vline 
WA_ASMD_TREE_STR-MATKL sy-vline 
WA_ASMD_TREE_STR-ERDAT sy-vline 
WA_ASMD_TREE_STR-ERNAM sy-vline 
WA_ASMD_TREE_STR-AEDAT sy-vline 
WA_ASMD_TREE_STR-AENAM sy-vline 
WA_ASMD_TREE_STR-LVORM sy-vline 
WA_ASMD_TREE_STR-EAN11 sy-vline 
WA_ASMD_TREE_STR-NUMTP sy-vline 
WA_ASMD_TREE_STR-SPART sy-vline 
WA_ASMD_TREE_STR-BEGRU sy-vline 
WA_ASMD_TREE_STR-MSTAE sy-vline 
WA_ASMD_TREE_STR-MSTDE sy-vline 
WA_ASMD_TREE_STR-BKLAS sy-vline 
WA_ASMD_TREE_STR-LSTHI sy-vline 
WA_ASMD_TREE_STR-MLANG sy-vline 
WA_ASMD_TREE_STR-LGART sy-vline 
WA_ASMD_TREE_STR-LBNUM sy-vline 
WA_ASMD_TREE_STR-AUSGB sy-vline 
WA_ASMD_TREE_STR-STLVPOS sy-vline 
WA_ASMD_TREE_STR-TAXIM sy-vline 
WA_ASMD_TREE_STR-IWUMZ sy-vline 
WA_ASMD_TREE_STR-IWUMN sy-vline 
WA_ASMD_TREE_STR-IWEIN sy-vline 
WA_ASMD_TREE_STR-FORMELNR sy-vline 
WA_ASMD_TREE_STR-CHGTEXT sy-vline 
WA_ASMD_TREE_STR-IMAGE_URL sy-vline      INTO ld_text SEPARATED BY SPACE.

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