ABAP Select data from SAP table A141 into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP A141 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 A141. 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 A141 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_A141 TYPE STANDARD TABLE OF A141,
      WA_A141 TYPE A141,
      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: <A141> TYPE A141.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_A141.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM A141
  INTO TABLE IT_A141.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM A141
*  INTO TABLE @DATA(IT_A1412).
*--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_A141 INDEX 1 INTO DATA(WA_A1412).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_A141 ASSIGNING <A141>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<A141>-MANDT = 1.
<A141>-KAPPL = 1.
<A141>-KSCHL = 1.
<A141>-KOKRS = 1.
<A141>-WERKS = 1.

ENDLOOP.

LOOP AT IT_A141 INTO WA_A141.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_A141-MATNR, sy-vline,
  WA_A141-PPRCTR, sy-vline,
  WA_A141-DATBI, sy-vline,
  WA_A141-DATAB, sy-vline,
  WA_A141-KNUMH, sy-vline,
ENDLOOP.
   
*Add any further fields from structure WA_A141 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_A141 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_A141 INTO WA_A141.


*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 MATN1, internal->external for field MATNR
CALL FUNCTION 'CONVERSION_EXIT_MATN1_OUTPUT'
  EXPORTING
    input =                      WA_A141-MATNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_A141-MATNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field PPRCTR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_A141-PPRCTR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_A141-PPRCTR.
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_A141_STR, 
MANDT TYPE STRING,
KAPPL TYPE STRING,
KSCHL TYPE STRING,
KOKRS TYPE STRING,
WERKS TYPE STRING,
MATNR TYPE STRING,
PPRCTR TYPE STRING,
DATBI TYPE STRING,
DATAB TYPE STRING,
KNUMH TYPE STRING,END OF T_EKKO_STR.
DATA: WA_A141_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_A141_STR-MANDT sy-vline 
WA_A141_STR-KAPPL sy-vline 
WA_A141_STR-KSCHL sy-vline 
WA_A141_STR-KOKRS sy-vline 
WA_A141_STR-WERKS sy-vline 
WA_A141_STR-MATNR sy-vline 
WA_A141_STR-PPRCTR sy-vline 
WA_A141_STR-DATBI sy-vline 
WA_A141_STR-DATAB sy-vline 
WA_A141_STR-KNUMH sy-vline      INTO ld_text SEPARATED BY SPACE.

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