ABAP Select data from SAP table TSTAHTW into internal table

Get Example source ABAP code based on a different SAP table
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Below is a number of ABAP code snippets to demonstrate how to select data from SAP TSTAHTW 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 TSTAHTW. 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 TSTAHTW 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_TSTAHTW TYPE STANDARD TABLE OF TSTAHTW,
      WA_TSTAHTW TYPE TSTAHTW,
      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: <TSTAHTW> TYPE TSTAHTW.

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM TSTAHTW
*  INTO TABLE @DATA(IT_TSTAHTW2).
*--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_TSTAHTW INDEX 1 INTO DATA(WA_TSTAHTW2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<TSTAHTW>-ID = 1.
<TSTAHTW>-STATUS = 1.
<TSTAHTW>-SEL_CUA = 1.
<TSTAHTW>-SEL_LANGU = 1.
<TSTAHTW>-SEL_FUNC = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_TSTAHTW-SEL_HANDL, sy-vline,
  WA_TSTAHTW-SEL_DOCU, sy-vline,
  WA_TSTAHTW-SEL_OTHER, sy-vline,
  WA_TSTAHTW-SEL_STEXT, sy-vline,
  WA_TSTAHTW-SEL_CUSTO, sy-vline,
  WA_TSTAHTW-CATTPROT, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_TSTAHTW 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_TSTAHTW 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_TSTAHTW INTO WA_TSTAHTW.


*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 CUNIT, internal->external for field TWB_WKUNIT
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_TSTAHTW-TWB_WKUNIT
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_TSTAHTW-TWB_WKUNIT.
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_TSTAHTW_STR, 
ID TYPE STRING,
STATUS TYPE STRING,
SEL_CUA TYPE STRING,
SEL_LANGU TYPE STRING,
SEL_FUNC TYPE STRING,
SEL_HANDL TYPE STRING,
SEL_DOCU TYPE STRING,
SEL_OTHER TYPE STRING,
SEL_STEXT TYPE STRING,
SEL_CUSTO TYPE STRING,
CATTPROT TYPE STRING,
CATTLNUM TYPE STRING,
TWB_WKREQ TYPE STRING,
TWB_WKUNIT TYPE STRING,
NOTE_TEXT TYPE STRING,
RFCDEST TYPE STRING,
LOGID TYPE STRING,
OBJ_LNR TYPE STRING,
TSTRC TYPE STRING,
TSTLOGID TYPE STRING,
TEST_FINISHED TYPE STRING,
FDATE TYPE STRING,
FUSER TYPE STRING,
LDATE TYPE STRING,
LUSER TYPE STRING,
FTIME TYPE STRING,
LTIME TYPE STRING,END OF T_EKKO_STR.
DATA: WA_TSTAHTW_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_TSTAHTW_STR-ID sy-vline 
WA_TSTAHTW_STR-STATUS sy-vline 
WA_TSTAHTW_STR-SEL_CUA sy-vline 
WA_TSTAHTW_STR-SEL_LANGU sy-vline 
WA_TSTAHTW_STR-SEL_FUNC sy-vline 
WA_TSTAHTW_STR-SEL_HANDL sy-vline 
WA_TSTAHTW_STR-SEL_DOCU sy-vline 
WA_TSTAHTW_STR-SEL_OTHER sy-vline 
WA_TSTAHTW_STR-SEL_STEXT sy-vline 
WA_TSTAHTW_STR-SEL_CUSTO sy-vline 
WA_TSTAHTW_STR-CATTPROT sy-vline 
WA_TSTAHTW_STR-CATTLNUM sy-vline 
WA_TSTAHTW_STR-TWB_WKREQ sy-vline 
WA_TSTAHTW_STR-TWB_WKUNIT sy-vline 
WA_TSTAHTW_STR-NOTE_TEXT sy-vline 
WA_TSTAHTW_STR-RFCDEST sy-vline 
WA_TSTAHTW_STR-LOGID sy-vline 
WA_TSTAHTW_STR-OBJ_LNR sy-vline 
WA_TSTAHTW_STR-TSTRC sy-vline 
WA_TSTAHTW_STR-TSTLOGID sy-vline 
WA_TSTAHTW_STR-TEST_FINISHED sy-vline 
WA_TSTAHTW_STR-FDATE sy-vline 
WA_TSTAHTW_STR-FUSER sy-vline 
WA_TSTAHTW_STR-LDATE sy-vline 
WA_TSTAHTW_STR-LUSER sy-vline 
WA_TSTAHTW_STR-FTIME sy-vline 
WA_TSTAHTW_STR-LTIME sy-vline      INTO ld_text SEPARATED BY SPACE.

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