ABAP Select data from SAP table PS0121 into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP PS0121 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 PS0121. 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 PS0121 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_PS0121 TYPE STANDARD TABLE OF PS0121,
      WA_PS0121 TYPE PS0121,
      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: <PS0121> TYPE PS0121.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_PS0121.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM PS0121
  INTO TABLE IT_PS0121.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM PS0121
*  INTO TABLE @DATA(IT_PS01212).
*--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_PS0121 INDEX 1 INTO DATA(WA_PS01212).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_PS0121 ASSIGNING <PS0121>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<PS0121>-HPERN = 1.
<PS0121>-RFP01 = 1.
<PS0121>-RFP02 = 1.
<PS0121>-RFP03 = 1.
<PS0121>-RFP04 = 1.

ENDLOOP.

LOOP AT IT_PS0121 INTO WA_PS0121.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_PS0121-RFP05, sy-vline,
  WA_PS0121-RFP06, sy-vline,
  WA_PS0121-RFP07, sy-vline,
  WA_PS0121-RFP08, sy-vline,
  WA_PS0121-RFP09, sy-vline,
  WA_PS0121-RFP10, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_PS0121 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_PS0121 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_PS0121 INTO WA_PS0121.


*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_PS0121_STR, 
HPERN TYPE STRING,
RFP01 TYPE STRING,
RFP02 TYPE STRING,
RFP03 TYPE STRING,
RFP04 TYPE STRING,
RFP05 TYPE STRING,
RFP06 TYPE STRING,
RFP07 TYPE STRING,
RFP08 TYPE STRING,
RFP09 TYPE STRING,
RFP10 TYPE STRING,
RFP11 TYPE STRING,
RFP12 TYPE STRING,
RFP13 TYPE STRING,
RFP14 TYPE STRING,
RFP15 TYPE STRING,
RFP16 TYPE STRING,
RFP17 TYPE STRING,
RFP18 TYPE STRING,
RFP19 TYPE STRING,
RFP20 TYPE STRING,
RFP21 TYPE STRING,END OF T_EKKO_STR.
DATA: WA_PS0121_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_PS0121_STR-HPERN sy-vline 
WA_PS0121_STR-RFP01 sy-vline 
WA_PS0121_STR-RFP02 sy-vline 
WA_PS0121_STR-RFP03 sy-vline 
WA_PS0121_STR-RFP04 sy-vline 
WA_PS0121_STR-RFP05 sy-vline 
WA_PS0121_STR-RFP06 sy-vline 
WA_PS0121_STR-RFP07 sy-vline 
WA_PS0121_STR-RFP08 sy-vline 
WA_PS0121_STR-RFP09 sy-vline 
WA_PS0121_STR-RFP10 sy-vline 
WA_PS0121_STR-RFP11 sy-vline 
WA_PS0121_STR-RFP12 sy-vline 
WA_PS0121_STR-RFP13 sy-vline 
WA_PS0121_STR-RFP14 sy-vline 
WA_PS0121_STR-RFP15 sy-vline 
WA_PS0121_STR-RFP16 sy-vline 
WA_PS0121_STR-RFP17 sy-vline 
WA_PS0121_STR-RFP18 sy-vline 
WA_PS0121_STR-RFP19 sy-vline 
WA_PS0121_STR-RFP20 sy-vline 
WA_PS0121_STR-RFP21 sy-vline      INTO ld_text SEPARATED BY SPACE.

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