ABAP Select data from SAP table P21_CSTAPSZ into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP P21_CSTAPSZ 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 P21_CSTAPSZ. 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 P21_CSTAPSZ 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_P21_CSTAPSZ TYPE STANDARD TABLE OF P21_CSTAPSZ,
      WA_P21_CSTAPSZ TYPE P21_CSTAPSZ,
      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: <P21_CSTAPSZ> TYPE P21_CSTAPSZ.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_P21_CSTAPSZ.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM P21_CSTAPSZ
  INTO TABLE IT_P21_CSTAPSZ.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM P21_CSTAPSZ
*  INTO TABLE @DATA(IT_P21_CSTAPSZ2).
*--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_P21_CSTAPSZ INDEX 1 INTO DATA(WA_P21_CSTAPSZ2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_P21_CSTAPSZ ASSIGNING <P21_CSTAPSZ>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<P21_CSTAPSZ>-PERNR = 1.
<P21_CSTAPSZ>-A_NEV = 1.
<P21_CSTAPSZ>-A_TAJ = 1.
<P21_CSTAPSZ>-G_NEV = 1.
<P21_CSTAPSZ>-G_TAJ = 1.

ENDLOOP.

LOOP AT IT_P21_CSTAPSZ INTO WA_P21_CSTAPSZ.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_P21_CSTAPSZ-SZBEG, sy-vline,
  WA_P21_CSTAPSZ-SZEND, sy-vline,
  WA_P21_CSTAPSZ-SZNAP, sy-vline,
  WA_P21_CSTAPSZ-FALAP, sy-vline,
  WA_P21_CSTAPSZ-FOSSZ, sy-vline,
  WA_P21_CSTAPSZ-AALAP1, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_P21_CSTAPSZ 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_P21_CSTAPSZ 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_P21_CSTAPSZ INTO WA_P21_CSTAPSZ.


*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_P21_CSTAPSZ_STR, 
PERNR TYPE STRING,
A_NEV TYPE STRING,
A_TAJ TYPE STRING,
G_NEV TYPE STRING,
G_TAJ TYPE STRING,
SZBEG TYPE STRING,
SZEND TYPE STRING,
SZNAP TYPE STRING,
FALAP TYPE STRING,
FOSSZ TYPE STRING,
AALAP1 TYPE STRING,
AALAP2 TYPE STRING,
SZM11 TYPE STRING,
SZM12 TYPE STRING,
SZM13 TYPE STRING,
SZM14 TYPE STRING,
SZM15 TYPE STRING,
SZM19 TYPE STRING,
WAERS TYPE STRING,END OF T_EKKO_STR.
DATA: WA_P21_CSTAPSZ_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_P21_CSTAPSZ_STR-PERNR sy-vline 
WA_P21_CSTAPSZ_STR-A_NEV sy-vline 
WA_P21_CSTAPSZ_STR-A_TAJ sy-vline 
WA_P21_CSTAPSZ_STR-G_NEV sy-vline 
WA_P21_CSTAPSZ_STR-G_TAJ sy-vline 
WA_P21_CSTAPSZ_STR-SZBEG sy-vline 
WA_P21_CSTAPSZ_STR-SZEND sy-vline 
WA_P21_CSTAPSZ_STR-SZNAP sy-vline 
WA_P21_CSTAPSZ_STR-FALAP sy-vline 
WA_P21_CSTAPSZ_STR-FOSSZ sy-vline 
WA_P21_CSTAPSZ_STR-AALAP1 sy-vline 
WA_P21_CSTAPSZ_STR-AALAP2 sy-vline 
WA_P21_CSTAPSZ_STR-SZM11 sy-vline 
WA_P21_CSTAPSZ_STR-SZM12 sy-vline 
WA_P21_CSTAPSZ_STR-SZM13 sy-vline 
WA_P21_CSTAPSZ_STR-SZM14 sy-vline 
WA_P21_CSTAPSZ_STR-SZM15 sy-vline 
WA_P21_CSTAPSZ_STR-SZM19 sy-vline 
WA_P21_CSTAPSZ_STR-WAERS sy-vline      INTO ld_text SEPARATED BY SPACE.

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