ABAP Select data from SAP table BL01_LISTE into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP BL01_LISTE 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 BL01_LISTE. 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 BL01_LISTE 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_BL01_LISTE TYPE STANDARD TABLE OF BL01_LISTE,
      WA_BL01_LISTE TYPE BL01_LISTE,
      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: <BL01_LISTE> TYPE BL01_LISTE.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_BL01_LISTE.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM BL01_LISTE
  INTO TABLE IT_BL01_LISTE.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM BL01_LISTE
*  INTO TABLE @DATA(IT_BL01_LISTE2).
*--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_BL01_LISTE INDEX 1 INTO DATA(WA_BL01_LISTE2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_BL01_LISTE ASSIGNING <BL01_LISTE>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<BL01_LISTE>-VARIANTE = 1.
<BL01_LISTE>-TABNAME = 1.
<BL01_LISTE>-FIELDNAME = 1.
<BL01_LISTE>-ANZZEILE = 1.
<BL01_LISTE>-ANZSPALTE = 1.

ENDLOOP.

LOOP AT IT_BL01_LISTE INTO WA_BL01_LISTE.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_BL01_LISTE-ANZLAENGE, sy-vline,
  WA_BL01_LISTE-SORTPOS, sy-vline,
  WA_BL01_LISTE-ABSTEIGEND, sy-vline,
  WA_BL01_LISTE-FARBE, sy-vline,
  WA_BL01_LISTE-AUSBLEND, sy-vline,
ENDLOOP.
   
*Add any further fields from structure WA_BL01_LISTE 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_BL01_LISTE 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_BL01_LISTE INTO WA_BL01_LISTE.


*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_BL01_LISTE_STR, 
VARIANTE TYPE STRING,
TABNAME TYPE STRING,
FIELDNAME TYPE STRING,
ANZZEILE TYPE STRING,
ANZSPALTE TYPE STRING,
ANZLAENGE TYPE STRING,
SORTPOS TYPE STRING,
ABSTEIGEND TYPE STRING,
FARBE TYPE STRING,
AUSBLEND TYPE STRING,END OF T_EKKO_STR.
DATA: WA_BL01_LISTE_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_BL01_LISTE_STR-VARIANTE sy-vline 
WA_BL01_LISTE_STR-TABNAME sy-vline 
WA_BL01_LISTE_STR-FIELDNAME sy-vline 
WA_BL01_LISTE_STR-ANZZEILE sy-vline 
WA_BL01_LISTE_STR-ANZSPALTE sy-vline 
WA_BL01_LISTE_STR-ANZLAENGE sy-vline 
WA_BL01_LISTE_STR-SORTPOS sy-vline 
WA_BL01_LISTE_STR-ABSTEIGEND sy-vline 
WA_BL01_LISTE_STR-FARBE sy-vline 
WA_BL01_LISTE_STR-AUSBLEND sy-vline      INTO ld_text SEPARATED BY SPACE.

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