ABAP Select data from SAP table PC291 into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP PC291 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 PC291. 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 PC291 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_PC291 TYPE STANDARD TABLE OF PC291,
      WA_PC291 TYPE PC291,
      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: <PC291> TYPE PC291.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_PC291.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM PC291
  INTO TABLE IT_PC291.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM PC291
*  INTO TABLE @DATA(IT_PC2912).
*--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_PC291 INDEX 1 INTO DATA(WA_PC2912).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_PC291 ASSIGNING <PC291>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<PC291>-GRNUM = 1.
<PC291>-OBJPS = 1.
<PC291>-SPINS = 1.
<PC291>-ORDCD = 1.
<PC291>-OCATE = 1.

ENDLOOP.

LOOP AT IT_PC291 INTO WA_PC291.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_PC291-OPRIO, sy-vline,
  WA_PC291-ORDLG, sy-vline,
  WA_PC291-RULID, sy-vline,
  WA_PC291-IBALN, sy-vline,
  WA_PC291-RBALN, sy-vline,
  WA_PC291-DEINF, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_PC291 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_PC291 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_PC291 INTO WA_PC291.


*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_PC291_STR, 
GRNUM TYPE STRING,
OBJPS TYPE STRING,
SPINS TYPE STRING,
ORDCD TYPE STRING,
OCATE TYPE STRING,
OPRIO TYPE STRING,
ORDLG TYPE STRING,
RULID TYPE STRING,
IBALN TYPE STRING,
RBALN TYPE STRING,
DEINF TYPE STRING,
DEVEN TYPE STRING,
LIMIT TYPE STRING,
LIMKU TYPE STRING,
LIMOF TYPE STRING,
LIMST TYPE STRING,
DISPN TYPE STRING,
DISKU TYPE STRING,
GROSS TYPE STRING,
GROKU TYPE STRING,
FEDMI TYPE STRING,
LIM12 TYPE STRING,
SPRUL TYPE STRING,
LEVY TYPE STRING,
ADDAT TYPE STRING,
TTD TYPE STRING,
MTD TYPE STRING,
PTD TYPE STRING,
YTD TYPE STRING,
HISTORIC TYPE STRING,
DEVEN2 TYPE STRING,
DINF2 TYPE STRING,END OF T_EKKO_STR.
DATA: WA_PC291_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_PC291_STR-GRNUM sy-vline 
WA_PC291_STR-OBJPS sy-vline 
WA_PC291_STR-SPINS sy-vline 
WA_PC291_STR-ORDCD sy-vline 
WA_PC291_STR-OCATE sy-vline 
WA_PC291_STR-OPRIO sy-vline 
WA_PC291_STR-ORDLG sy-vline 
WA_PC291_STR-RULID sy-vline 
WA_PC291_STR-IBALN sy-vline 
WA_PC291_STR-RBALN sy-vline 
WA_PC291_STR-DEINF sy-vline 
WA_PC291_STR-DEVEN sy-vline 
WA_PC291_STR-LIMIT sy-vline 
WA_PC291_STR-LIMKU sy-vline 
WA_PC291_STR-LIMOF sy-vline 
WA_PC291_STR-LIMST sy-vline 
WA_PC291_STR-DISPN sy-vline 
WA_PC291_STR-DISKU sy-vline 
WA_PC291_STR-GROSS sy-vline 
WA_PC291_STR-GROKU sy-vline 
WA_PC291_STR-FEDMI sy-vline 
WA_PC291_STR-LIM12 sy-vline 
WA_PC291_STR-SPRUL sy-vline 
WA_PC291_STR-LEVY sy-vline 
WA_PC291_STR-ADDAT sy-vline 
WA_PC291_STR-TTD sy-vline 
WA_PC291_STR-MTD sy-vline 
WA_PC291_STR-PTD sy-vline 
WA_PC291_STR-YTD sy-vline 
WA_PC291_STR-HISTORIC sy-vline 
WA_PC291_STR-DEVEN2 sy-vline 
WA_PC291_STR-DINF2 sy-vline      INTO ld_text SEPARATED BY SPACE.

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