ABAP Select data from SAP table BDLIFFIELD 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 BDLIFFIELD 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 BDLIFFIELD. 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 BDLIFFIELD 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_BDLIFFIELD TYPE STANDARD TABLE OF BDLIFFIELD,
      WA_BDLIFFIELD TYPE BDLIFFIELD,
      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: <BDLIFFIELD> TYPE BDLIFFIELD.

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM BDLIFFIELD
*  INTO TABLE @DATA(IT_BDLIFFIELD2).
*--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_BDLIFFIELD INDEX 1 INTO DATA(WA_BDLIFFIELD2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<BDLIFFIELD>-LOGFUNC = 1.
<BDLIFFIELD>-CLUST_ID = 1.
<BDLIFFIELD>-TABNAME = 1.
<BDLIFFIELD>-FIELDPOSITION = 1.
<BDLIFFIELD>-FIELDNAME = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_BDLIFFIELD-DDLANGUAGE, sy-vline,
  WA_BDLIFFIELD-KEYFLAG, sy-vline,
  WA_BDLIFFIELD-ROLLNAME, sy-vline,
  WA_BDLIFFIELD-ADMINFIELD, sy-vline,
  WA_BDLIFFIELD-INTTYPE, sy-vline,
  WA_BDLIFFIELD-INTLEN, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_BDLIFFIELD 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_BDLIFFIELD 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_BDLIFFIELD INTO WA_BDLIFFIELD.


*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_BDLIFFIELD_STR, 
LOGFUNC TYPE STRING,
CLUST_ID TYPE STRING,
TABNAME TYPE STRING,
FIELDPOSITION TYPE STRING,
FIELDNAME TYPE STRING,
DDLANGUAGE TYPE STRING,
KEYFLAG TYPE STRING,
ROLLNAME TYPE STRING,
ADMINFIELD TYPE STRING,
INTTYPE TYPE STRING,
INTLEN TYPE STRING,
PRECFIELD TYPE STRING,
DATATYPE TYPE STRING,
LENG TYPE STRING,
OUTPUTLEN TYPE STRING,
DECIMALS TYPE STRING,
DDTEXT TYPE STRING,
STATUS TYPE STRING,
CHGSTAMP TYPE STRING,END OF T_EKKO_STR.
DATA: WA_BDLIFFIELD_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_BDLIFFIELD_STR-LOGFUNC sy-vline 
WA_BDLIFFIELD_STR-CLUST_ID sy-vline 
WA_BDLIFFIELD_STR-TABNAME sy-vline 
WA_BDLIFFIELD_STR-FIELDPOSITION sy-vline 
WA_BDLIFFIELD_STR-FIELDNAME sy-vline 
WA_BDLIFFIELD_STR-DDLANGUAGE sy-vline 
WA_BDLIFFIELD_STR-KEYFLAG sy-vline 
WA_BDLIFFIELD_STR-ROLLNAME sy-vline 
WA_BDLIFFIELD_STR-ADMINFIELD sy-vline 
WA_BDLIFFIELD_STR-INTTYPE sy-vline 
WA_BDLIFFIELD_STR-INTLEN sy-vline 
WA_BDLIFFIELD_STR-PRECFIELD sy-vline 
WA_BDLIFFIELD_STR-DATATYPE sy-vline 
WA_BDLIFFIELD_STR-LENG sy-vline 
WA_BDLIFFIELD_STR-OUTPUTLEN sy-vline 
WA_BDLIFFIELD_STR-DECIMALS sy-vline 
WA_BDLIFFIELD_STR-DDTEXT sy-vline 
WA_BDLIFFIELD_STR-STATUS sy-vline 
WA_BDLIFFIELD_STR-CHGSTAMP sy-vline      INTO ld_text SEPARATED BY SPACE.

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