ABAP Select data from SAP table P1954 into internal table

Get Example source ABAP code based on a different SAP table
  Get ABAP code

Below is a number of ABAP code snippets to demonstrate how to select data from SAP P1954 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 P1954.

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 P1954 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_P1954 TYPE STANDARD TABLE OF P1954,
      WA_P1954 TYPE P1954,
      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: <P1954> TYPE P1954.


*Original SAP ECC Select statement 
SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM P1954
  INTO TABLE IT_P1954.

*Select data and declare internal table using  in-line method @DATA 
SELECT *
  FROM P1954
  INTO TABLE @DATA(IT_P19542).

*You can also declare the header/work area using the  in-line DATA declaration method 
READ TABLE IT_P1954 INDEX 1 INTO DATA(WA_P19542).


*Latest ABAP cloud SELECT statement using the FIELDS syntax. But note to following the clean core principles you should not select directly from an SAP table 
* and should instead use a CDS view or create you own CDS and use that.
SELECT FROM P1954
  FIELDS *
*  WHERE would go here
  INTO TABLE @DATA(IT_P19542).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_P1954 ASSIGNING <P1954>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<P1954>-MANDT = 1.
<P1954>-PLVAR = 1.
<P1954>-OTYPE = 1.
<P1954>-OBJID = 1.
<P1954>-INFTY = 1.

ENDLOOP.

LOOP AT IT_P1954 INTO WA_P1954.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_P1954-SUBTY, sy-vline,
  WA_P1954-ISTAT, sy-vline,
  WA_P1954-PRIOX, sy-vline,
  WA_P1954-BEGDA, sy-vline,
  WA_P1954-ENDDA, sy-vline,
  WA_P1954-VARYF, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_P1954 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_P1954 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_P1954 INTO WA_P1954.


*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.