ABAP Select data from SAP table RELS_FLURST_HIER_TREE_KNA into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM RELS_FLURST_HIER_TREE_KNA
*  INTO TABLE @DATA(IT_RELS_FLURST_HIER_TREE_KNA2).
*--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_RELS_FLURST_HIER_TREE_KNA INDEX 1 INTO DATA(WA_RELS_FLURST_HIER_TREE_KNA2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<RELS_FLURST_HIER_TREE_KNA>-MANDT = 1.
<RELS_FLURST_HIER_TREE_KNA>-LFDNR = 1.
<RELS_FLURST_HIER_TREE_KNA>-EBENE = 1.
<RELS_FLURST_HIER_TREE_KNA>-XLBEZ = 1.
<RELS_FLURST_HIER_TREE_KNA>-PARTNR2 = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_RELS_FLURST_HIER_TREE_KNA-PARTNAME2, sy-vline,
  WA_RELS_FLURST_HIER_TREE_KNA-PARTNR1, sy-vline,
  WA_RELS_FLURST_HIER_TREE_KNA-PARTNAME1, sy-vline,
  WA_RELS_FLURST_HIER_TREE_KNA-INTRENO_FL, sy-vline,
  WA_RELS_FLURST_HIER_TREE_KNA-LAND1, sy-vline,
  WA_RELS_FLURST_HIER_TREE_KNA-BUNDESLAND, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_RELS_FLURST_HIER_TREE_KNA 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_RELS_FLURST_HIER_TREE_KNA 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_RELS_FLURST_HIER_TREE_KNA INTO WA_RELS_FLURST_HIER_TREE_KNA.


*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 PARTNR2
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RELS_FLURST_HIER_TREE_KNA-PARTNR2
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RELS_FLURST_HIER_TREE_KNA-PARTNR2.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field PARTNR1
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RELS_FLURST_HIER_TREE_KNA-PARTNR1
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RELS_FLURST_HIER_TREE_KNA-PARTNR1.
WRITE:/ 'New Value:', ld_input.

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

*Conversion exit CUNIT, internal->external for field FEINS_NA
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_RELS_FLURST_HIER_TREE_KNA-FEINS_NA
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RELS_FLURST_HIER_TREE_KNA-FEINS_NA.
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_RELS_FLURST_HIER_TREE_KNA_STR, 
MANDT TYPE STRING,
LFDNR TYPE STRING,
EBENE TYPE STRING,
XLBEZ TYPE STRING,
PARTNR2 TYPE STRING,
PARTNAME2 TYPE STRING,
PARTNR1 TYPE STRING,
PARTNAME1 TYPE STRING,
INTRENO_FL TYPE STRING,
LAND1 TYPE STRING,
BUNDESLAND TYPE STRING,
GEMARKUNG TYPE STRING,
FLUR TYPE STRING,
FLURSTUECK TYPE STRING,
COUNTRY TYPE STRING,
STATE TYPE STRING,
SLIDENUM TYPE STRING,
CLASSIFICATION TYPE STRING,
FLAECHE_NA TYPE STRING,
FEINS_NA TYPE STRING,END OF T_EKKO_STR.
DATA: WA_RELS_FLURST_HIER_TREE_KNA_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_RELS_FLURST_HIER_TREE_KNA_STR-MANDT sy-vline 
WA_RELS_FLURST_HIER_TREE_KNA_STR-LFDNR sy-vline 
WA_RELS_FLURST_HIER_TREE_KNA_STR-EBENE sy-vline 
WA_RELS_FLURST_HIER_TREE_KNA_STR-XLBEZ sy-vline 
WA_RELS_FLURST_HIER_TREE_KNA_STR-PARTNR2 sy-vline 
WA_RELS_FLURST_HIER_TREE_KNA_STR-PARTNAME2 sy-vline 
WA_RELS_FLURST_HIER_TREE_KNA_STR-PARTNR1 sy-vline 
WA_RELS_FLURST_HIER_TREE_KNA_STR-PARTNAME1 sy-vline 
WA_RELS_FLURST_HIER_TREE_KNA_STR-INTRENO_FL sy-vline 
WA_RELS_FLURST_HIER_TREE_KNA_STR-LAND1 sy-vline 
WA_RELS_FLURST_HIER_TREE_KNA_STR-BUNDESLAND sy-vline 
WA_RELS_FLURST_HIER_TREE_KNA_STR-GEMARKUNG sy-vline 
WA_RELS_FLURST_HIER_TREE_KNA_STR-FLUR sy-vline 
WA_RELS_FLURST_HIER_TREE_KNA_STR-FLURSTUECK sy-vline 
WA_RELS_FLURST_HIER_TREE_KNA_STR-COUNTRY sy-vline 
WA_RELS_FLURST_HIER_TREE_KNA_STR-STATE sy-vline 
WA_RELS_FLURST_HIER_TREE_KNA_STR-SLIDENUM sy-vline 
WA_RELS_FLURST_HIER_TREE_KNA_STR-CLASSIFICATION sy-vline 
WA_RELS_FLURST_HIER_TREE_KNA_STR-FLAECHE_NA sy-vline 
WA_RELS_FLURST_HIER_TREE_KNA_STR-FEINS_NA sy-vline      INTO ld_text SEPARATED BY SPACE.

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