ABAP Select data from SAP table BDLTUNEHD into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM BDLTUNEHD
*  INTO TABLE @DATA(IT_BDLTUNEHD2).
*--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_BDLTUNEHD INDEX 1 INTO DATA(WA_BDLTUNEHD2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<BDLTUNEHD>-DATE = 1.
<BDLTUNEHD>-ALLOC_SIZE = 1.
<BDLTUNEHD>-AVAIL_SIZE = 1.
<BDLTUNEHD>-FRAME_SIZE = 1.
<BDLTUNEHD>-MAX_OBJCTS = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_BDLTUNEHD-HASH_WIDTH, sy-vline,
  WA_BDLTUNEHD-CUT_VALUE, sy-vline,
  WA_BDLTUNEHD-ACT_OBJCTS, sy-vline,
  WA_BDLTUNEHD-CON_OBJCTS, sy-vline,
  WA_BDLTUNEHD-USED_SPACE, sy-vline,
  WA_BDLTUNEHD-MAX_FRMES, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_BDLTUNEHD 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_BDLTUNEHD 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_BDLTUNEHD INTO WA_BDLTUNEHD.


*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.
ENDFORM. 

*&---------------------------------------------------------------------*
*& Form process_as_string_field_values
*&---------------------------------------------------------------------*
FORM process_as_string_field_values CHANGING p_EKKO LIKE wa_EKKO.

TYPES: BEGIN OF T_BDLTUNEHD_STR, 
DATE TYPE STRING,
ALLOC_SIZE TYPE STRING,
AVAIL_SIZE TYPE STRING,
FRAME_SIZE TYPE STRING,
MAX_OBJCTS TYPE STRING,
HASH_WIDTH TYPE STRING,
CUT_VALUE TYPE STRING,
ACT_OBJCTS TYPE STRING,
CON_OBJCTS TYPE STRING,
USED_SPACE TYPE STRING,
MAX_FRMES TYPE STRING,
ALLOC_FRMS TYPE STRING,
REQUEST TYPE STRING,
HIT TYPE STRING,
OBJ_N_FND TYPE STRING,
INSERT TYPE STRING,
UPDATE TYPE STRING,
REQ_DELETE TYPE STRING,
DELETE TYPE STRING,
FREE_OBJCT TYPE STRING,
DB_ACCESS TYPE STRING,
DB_ACC_SVD TYPE STRING,
REORG TYPE STRING,
SWAP TYPE STRING,
SWAP_FRAME TYPE STRING,
SEARCH TYPE STRING,
SEARCH_INS TYPE STRING,
SUM_SIZE TYPE STRING,
SUM_SIZE2 TYPE STRING,
MAX_SIZE TYPE STRING,
MIN_SIZE TYPE STRING,
REFRESH TYPE STRING,
SIZE_UNIT TYPE STRING,
RESERVE TYPE STRING,
ALLOC TYPE STRING,
SMODE TYPE STRING,
UP_TIME TYPE STRING,
LAST_REFR TYPE STRING,
NAME TYPE STRING,END OF T_EKKO_STR.
DATA: WA_BDLTUNEHD_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_BDLTUNEHD_STR-DATE sy-vline 
WA_BDLTUNEHD_STR-ALLOC_SIZE sy-vline 
WA_BDLTUNEHD_STR-AVAIL_SIZE sy-vline 
WA_BDLTUNEHD_STR-FRAME_SIZE sy-vline 
WA_BDLTUNEHD_STR-MAX_OBJCTS sy-vline 
WA_BDLTUNEHD_STR-HASH_WIDTH sy-vline 
WA_BDLTUNEHD_STR-CUT_VALUE sy-vline 
WA_BDLTUNEHD_STR-ACT_OBJCTS sy-vline 
WA_BDLTUNEHD_STR-CON_OBJCTS sy-vline 
WA_BDLTUNEHD_STR-USED_SPACE sy-vline 
WA_BDLTUNEHD_STR-MAX_FRMES sy-vline 
WA_BDLTUNEHD_STR-ALLOC_FRMS sy-vline 
WA_BDLTUNEHD_STR-REQUEST sy-vline 
WA_BDLTUNEHD_STR-HIT sy-vline 
WA_BDLTUNEHD_STR-OBJ_N_FND sy-vline 
WA_BDLTUNEHD_STR-INSERT sy-vline 
WA_BDLTUNEHD_STR-UPDATE sy-vline 
WA_BDLTUNEHD_STR-REQ_DELETE sy-vline 
WA_BDLTUNEHD_STR-DELETE sy-vline 
WA_BDLTUNEHD_STR-FREE_OBJCT sy-vline 
WA_BDLTUNEHD_STR-DB_ACCESS sy-vline 
WA_BDLTUNEHD_STR-DB_ACC_SVD sy-vline 
WA_BDLTUNEHD_STR-REORG sy-vline 
WA_BDLTUNEHD_STR-SWAP sy-vline 
WA_BDLTUNEHD_STR-SWAP_FRAME sy-vline 
WA_BDLTUNEHD_STR-SEARCH sy-vline 
WA_BDLTUNEHD_STR-SEARCH_INS sy-vline 
WA_BDLTUNEHD_STR-SUM_SIZE sy-vline 
WA_BDLTUNEHD_STR-SUM_SIZE2 sy-vline 
WA_BDLTUNEHD_STR-MAX_SIZE sy-vline 
WA_BDLTUNEHD_STR-MIN_SIZE sy-vline 
WA_BDLTUNEHD_STR-REFRESH sy-vline 
WA_BDLTUNEHD_STR-SIZE_UNIT sy-vline 
WA_BDLTUNEHD_STR-RESERVE sy-vline 
WA_BDLTUNEHD_STR-ALLOC sy-vline 
WA_BDLTUNEHD_STR-SMODE sy-vline 
WA_BDLTUNEHD_STR-UP_TIME sy-vline 
WA_BDLTUNEHD_STR-LAST_REFR sy-vline 
WA_BDLTUNEHD_STR-NAME sy-vline      INTO ld_text SEPARATED BY SPACE.

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