ABAP Select data from SAP table TJHAK into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM TJHAK
*  INTO TABLE @DATA(IT_TJHAK2).
*--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_TJHAK INDEX 1 INTO DATA(WA_TJHAK2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<TJHAK>-MANDT = 1.
<TJHAK>-AUART = 1.
<TJHAK>-KOPGR = 1.
<TJHAK>-INCPO = 1.
<TJHAK>-INCUPO = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_TJHAK-UEVOR, sy-vline,
  WA_TJHAK-FAKSK, sy-vline,
  WA_TJHAK-TRVOG, sy-vline,
  WA_TJHAK-DIAFE, sy-vline,
  WA_TJHAK-FELDK, sy-vline,
  WA_TJHAK-VBTYP, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_TJHAK 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_TJHAK 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_TJHAK INTO WA_TJHAK.


*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 STGVB
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_TJHAK-STGVB
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_TJHAK-STGVB.
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_TJHAK_STR, 
MANDT TYPE STRING,
AUART TYPE STRING,
KOPGR TYPE STRING,
INCPO TYPE STRING,
INCUPO TYPE STRING,
UEVOR TYPE STRING,
FAKSK TYPE STRING,
TRVOG TYPE STRING,
DIAFE TYPE STRING,
FELDK TYPE STRING,
VBTYP TYPE STRING,
KALVG TYPE STRING,
KLIMP TYPE STRING,
CMGRA TYPE STRING,
KALSM TYPE STRING,
SPERR TYPE STRING,
STGVB TYPE STRING,
AUARA TYPE STRING,
XKOPFEINST TYPE STRING,
XPUEBEINST TYPE STRING,
XGUELTOBL TYPE STRING,
AENAM TYPE STRING,
AEDAT TYPE STRING,END OF T_EKKO_STR.
DATA: WA_TJHAK_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_TJHAK_STR-MANDT sy-vline 
WA_TJHAK_STR-AUART sy-vline 
WA_TJHAK_STR-KOPGR sy-vline 
WA_TJHAK_STR-INCPO sy-vline 
WA_TJHAK_STR-INCUPO sy-vline 
WA_TJHAK_STR-UEVOR sy-vline 
WA_TJHAK_STR-FAKSK sy-vline 
WA_TJHAK_STR-TRVOG sy-vline 
WA_TJHAK_STR-DIAFE sy-vline 
WA_TJHAK_STR-FELDK sy-vline 
WA_TJHAK_STR-VBTYP sy-vline 
WA_TJHAK_STR-KALVG sy-vline 
WA_TJHAK_STR-KLIMP sy-vline 
WA_TJHAK_STR-CMGRA sy-vline 
WA_TJHAK_STR-KALSM sy-vline 
WA_TJHAK_STR-SPERR sy-vline 
WA_TJHAK_STR-STGVB sy-vline 
WA_TJHAK_STR-AUARA sy-vline 
WA_TJHAK_STR-XKOPFEINST sy-vline 
WA_TJHAK_STR-XPUEBEINST sy-vline 
WA_TJHAK_STR-XGUELTOBL sy-vline 
WA_TJHAK_STR-AENAM sy-vline 
WA_TJHAK_STR-AEDAT sy-vline      INTO ld_text SEPARATED BY SPACE.

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