ABAP Select data from SAP table USS_STH_HEADER into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM USS_STH_HEADER
*  INTO TABLE @DATA(IT_USS_STH_HEADER2).
*--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_USS_STH_HEADER INDEX 1 INTO DATA(WA_USS_STH_HEADER2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<USS_STH_HEADER>-AKTYP = 1.
<USS_STH_HEADER>-RLTP1 = 1.
<USS_STH_HEADER>-RLTP2 = 1.
<USS_STH_HEADER>-RLTP3 = 1.
<USS_STH_HEADER>-RLTP4 = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_USS_STH_HEADER-RLTP5, sy-vline,
  WA_USS_STH_HEADER-RLTP6, sy-vline,
  WA_USS_STH_HEADER-RLTP7, sy-vline,
  WA_USS_STH_HEADER-RLTP8, sy-vline,
  WA_USS_STH_HEADER-RLTP9, sy-vline,
  WA_USS_STH_HEADER-PARTNER, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_USS_STH_HEADER 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_USS_STH_HEADER 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_USS_STH_HEADER INTO WA_USS_STH_HEADER.


*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 PARTNER
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_USS_STH_HEADER-PARTNER
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_USS_STH_HEADER-PARTNER.
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_USS_STH_HEADER_STR, 
AKTYP TYPE STRING,
RLTP1 TYPE STRING,
RLTP2 TYPE STRING,
RLTP3 TYPE STRING,
RLTP4 TYPE STRING,
RLTP5 TYPE STRING,
RLTP6 TYPE STRING,
RLTP7 TYPE STRING,
RLTP8 TYPE STRING,
RLTP9 TYPE STRING,
PARTNER TYPE STRING,
VALDT TYPE STRING,
TYPE TYPE STRING,
BPKIND TYPE STRING,
BU_GROUP TYPE STRING,
BPEXT TYPE STRING,END OF T_EKKO_STR.
DATA: WA_USS_STH_HEADER_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_USS_STH_HEADER_STR-AKTYP sy-vline 
WA_USS_STH_HEADER_STR-RLTP1 sy-vline 
WA_USS_STH_HEADER_STR-RLTP2 sy-vline 
WA_USS_STH_HEADER_STR-RLTP3 sy-vline 
WA_USS_STH_HEADER_STR-RLTP4 sy-vline 
WA_USS_STH_HEADER_STR-RLTP5 sy-vline 
WA_USS_STH_HEADER_STR-RLTP6 sy-vline 
WA_USS_STH_HEADER_STR-RLTP7 sy-vline 
WA_USS_STH_HEADER_STR-RLTP8 sy-vline 
WA_USS_STH_HEADER_STR-RLTP9 sy-vline 
WA_USS_STH_HEADER_STR-PARTNER sy-vline 
WA_USS_STH_HEADER_STR-VALDT sy-vline 
WA_USS_STH_HEADER_STR-TYPE sy-vline 
WA_USS_STH_HEADER_STR-BPKIND sy-vline 
WA_USS_STH_HEADER_STR-BU_GROUP sy-vline 
WA_USS_STH_HEADER_STR-BPEXT sy-vline      INTO ld_text SEPARATED BY SPACE.

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