ABAP Select data from SAP table P21_BB_ALV_TMUNK into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP P21_BB_ALV_TMUNK 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 P21_BB_ALV_TMUNK. 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 P21_BB_ALV_TMUNK 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_P21_BB_ALV_TMUNK TYPE STANDARD TABLE OF P21_BB_ALV_TMUNK,
      WA_P21_BB_ALV_TMUNK TYPE P21_BB_ALV_TMUNK,
      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: <P21_BB_ALV_TMUNK> TYPE P21_BB_ALV_TMUNK.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_P21_BB_ALV_TMUNK.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM P21_BB_ALV_TMUNK
  INTO TABLE IT_P21_BB_ALV_TMUNK.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM P21_BB_ALV_TMUNK
*  INTO TABLE @DATA(IT_P21_BB_ALV_TMUNK2).
*--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_P21_BB_ALV_TMUNK INDEX 1 INTO DATA(WA_P21_BB_ALV_TMUNK2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_P21_BB_ALV_TMUNK ASSIGNING <P21_BB_ALV_TMUNK>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<P21_BB_ALV_TMUNK>-SEQNR = 1.
<P21_BB_ALV_TMUNK>-JELLEG = 1.
<P21_BB_ALV_TMUNK>-OESI = 1.
<P21_BB_ALV_TMUNK>-VDATE = 1.
<P21_BB_ALV_TMUNK>-PERNR = 1.

ENDLOOP.

LOOP AT IT_P21_BB_ALV_TMUNK INTO WA_P21_BB_ALV_TMUNK.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_P21_BB_ALV_TMUNK-STRNR, sy-vline,
  WA_P21_BB_ALV_TMUNK-TAJ, sy-vline,
  WA_P21_BB_ALV_TMUNK-VISELTNEV, sy-vline,
  WA_P21_BB_ALV_TMUNK-VISELTNEV1, sy-vline,
  WA_P21_BB_ALV_TMUNK-VISELTNEV2, sy-vline,
  WA_P21_BB_ALV_TMUNK-SZULINEV, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_P21_BB_ALV_TMUNK 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_P21_BB_ALV_TMUNK 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_P21_BB_ALV_TMUNK INTO WA_P21_BB_ALV_TMUNK.


*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 PDATE, internal->external for field SZULIDO
CALL FUNCTION 'CONVERSION_EXIT_PDATE_OUTPUT'
  EXPORTING
    input =                      WA_P21_BB_ALV_TMUNK-SZULIDO
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_P21_BB_ALV_TMUNK-SZULIDO.
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_P21_BB_ALV_TMUNK_STR, 
SEQNR TYPE STRING,
JELLEG TYPE STRING,
OESI TYPE STRING,
VDATE TYPE STRING,
PERNR TYPE STRING,
STRNR TYPE STRING,
TAJ TYPE STRING,
VISELTNEV TYPE STRING,
VISELTNEV1 TYPE STRING,
VISELTNEV2 TYPE STRING,
SZULINEV TYPE STRING,
SZULINEV1 TYPE STRING,
SZULINEV2 TYPE STRING,
ANYJA TYPE STRING,
ANYJA1 TYPE STRING,
ANYJA2 TYPE STRING,
SZULHELY TYPE STRING,
SZULORSZAG TYPE STRING,
SZULIDO TYPE STRING,
ALLAMPOLG TYPE STRING,
NEM TYPE STRING,
TM_JELLEG TYPE STRING,
ADOSZ TYPE STRING,
NEV TYPE STRING,
BEGDA TYPE STRING,
ENDDA TYPE STRING,END OF T_EKKO_STR.
DATA: WA_P21_BB_ALV_TMUNK_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_P21_BB_ALV_TMUNK_STR-SEQNR sy-vline 
WA_P21_BB_ALV_TMUNK_STR-JELLEG sy-vline 
WA_P21_BB_ALV_TMUNK_STR-OESI sy-vline 
WA_P21_BB_ALV_TMUNK_STR-VDATE sy-vline 
WA_P21_BB_ALV_TMUNK_STR-PERNR sy-vline 
WA_P21_BB_ALV_TMUNK_STR-STRNR sy-vline 
WA_P21_BB_ALV_TMUNK_STR-TAJ sy-vline 
WA_P21_BB_ALV_TMUNK_STR-VISELTNEV sy-vline 
WA_P21_BB_ALV_TMUNK_STR-VISELTNEV1 sy-vline 
WA_P21_BB_ALV_TMUNK_STR-VISELTNEV2 sy-vline 
WA_P21_BB_ALV_TMUNK_STR-SZULINEV sy-vline 
WA_P21_BB_ALV_TMUNK_STR-SZULINEV1 sy-vline 
WA_P21_BB_ALV_TMUNK_STR-SZULINEV2 sy-vline 
WA_P21_BB_ALV_TMUNK_STR-ANYJA sy-vline 
WA_P21_BB_ALV_TMUNK_STR-ANYJA1 sy-vline 
WA_P21_BB_ALV_TMUNK_STR-ANYJA2 sy-vline 
WA_P21_BB_ALV_TMUNK_STR-SZULHELY sy-vline 
WA_P21_BB_ALV_TMUNK_STR-SZULORSZAG sy-vline 
WA_P21_BB_ALV_TMUNK_STR-SZULIDO sy-vline 
WA_P21_BB_ALV_TMUNK_STR-ALLAMPOLG sy-vline 
WA_P21_BB_ALV_TMUNK_STR-NEM sy-vline 
WA_P21_BB_ALV_TMUNK_STR-TM_JELLEG sy-vline 
WA_P21_BB_ALV_TMUNK_STR-ADOSZ sy-vline 
WA_P21_BB_ALV_TMUNK_STR-NEV sy-vline 
WA_P21_BB_ALV_TMUNK_STR-BEGDA sy-vline 
WA_P21_BB_ALV_TMUNK_STR-ENDDA sy-vline      INTO ld_text SEPARATED BY SPACE.

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