ABAP Select data from SAP table BTAB_DD12L into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP BTAB_DD12L 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 BTAB_DD12L. 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 BTAB_DD12L 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_BTAB_DD12L TYPE STANDARD TABLE OF BTAB_DD12L,
      WA_BTAB_DD12L TYPE BTAB_DD12L,
      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: <BTAB_DD12L> TYPE BTAB_DD12L.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_BTAB_DD12L.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM BTAB_DD12L
  INTO TABLE IT_BTAB_DD12L.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM BTAB_DD12L
*  INTO TABLE @DATA(IT_BTAB_DD12L2).
*--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_BTAB_DD12L INDEX 1 INTO DATA(WA_BTAB_DD12L2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_BTAB_DD12L ASSIGNING <BTAB_DD12L>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<BTAB_DD12L>-SQLTAB = 1.
<BTAB_DD12L>-INDEXNAME = 1.
<BTAB_DD12L>-AS4LOCAL = 1.
<BTAB_DD12L>-AS4VERS = 1.
<BTAB_DD12L>-AS4USER = 1.

ENDLOOP.

LOOP AT IT_BTAB_DD12L INTO WA_BTAB_DD12L.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_BTAB_DD12L-AS4DATE, sy-vline,
  WA_BTAB_DD12L-AS4TIME, sy-vline,
  WA_BTAB_DD12L-UNIQUEFLAG, sy-vline,
  WA_BTAB_DD12L-DBINDEX, sy-vline,
  WA_BTAB_DD12L-FIELDNAME, sy-vline,
  WA_BTAB_DD12L-POSITION, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_BTAB_DD12L 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_BTAB_DD12L 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_BTAB_DD12L INTO WA_BTAB_DD12L.


*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_BTAB_DD12L_STR, 
SQLTAB TYPE STRING,
INDEXNAME TYPE STRING,
AS4LOCAL TYPE STRING,
AS4VERS TYPE STRING,
AS4USER TYPE STRING,
AS4DATE TYPE STRING,
AS4TIME TYPE STRING,
UNIQUEFLAG TYPE STRING,
DBINDEX TYPE STRING,
FIELDNAME TYPE STRING,
POSITION TYPE STRING,END OF T_EKKO_STR.
DATA: WA_BTAB_DD12L_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_BTAB_DD12L_STR-SQLTAB sy-vline 
WA_BTAB_DD12L_STR-INDEXNAME sy-vline 
WA_BTAB_DD12L_STR-AS4LOCAL sy-vline 
WA_BTAB_DD12L_STR-AS4VERS sy-vline 
WA_BTAB_DD12L_STR-AS4USER sy-vline 
WA_BTAB_DD12L_STR-AS4DATE sy-vline 
WA_BTAB_DD12L_STR-AS4TIME sy-vline 
WA_BTAB_DD12L_STR-UNIQUEFLAG sy-vline 
WA_BTAB_DD12L_STR-DBINDEX sy-vline 
WA_BTAB_DD12L_STR-FIELDNAME sy-vline 
WA_BTAB_DD12L_STR-POSITION sy-vline      INTO ld_text SEPARATED BY SPACE.

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