ABAP Select data from SAP table P20_AAREG into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP P20_AAREG 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 P20_AAREG. 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 P20_AAREG 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_P20_AAREG TYPE STANDARD TABLE OF P20_AAREG,
      WA_P20_AAREG TYPE P20_AAREG,
      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: <P20_AAREG> TYPE P20_AAREG.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_P20_AAREG.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM P20_AAREG
  INTO TABLE IT_P20_AAREG.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM P20_AAREG
*  INTO TABLE @DATA(IT_P20_AAREG2).
*--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_P20_AAREG INDEX 1 INTO DATA(WA_P20_AAREG2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_P20_AAREG ASSIGNING <P20_AAREG>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<P20_AAREG>-MANDT = 1.
<P20_AAREG>-PERNR = 1.
<P20_AAREG>-BEGDA = 1.
<P20_AAREG>-ENDDA = 1.
<P20_AAREG>-RDATE = 1.

ENDLOOP.

LOOP AT IT_P20_AAREG INTO WA_P20_AAREG.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_P20_AAREG-STAT2, sy-vline,
  WA_P20_AAREG-ORGNJ, sy-vline,
  WA_P20_AAREG-ORGNB, sy-vline,
  WA_P20_AAREG-CORGN, sy-vline,
  WA_P20_AAREG-CHIRD, sy-vline,
  WA_P20_AAREG-WOLIM, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_P20_AAREG 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_P20_AAREG 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_P20_AAREG INTO WA_P20_AAREG.


*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_P20_AAREG_STR, 
MANDT TYPE STRING,
PERNR TYPE STRING,
BEGDA TYPE STRING,
ENDDA TYPE STRING,
RDATE TYPE STRING,
STAT2 TYPE STRING,
ORGNJ TYPE STRING,
ORGNB TYPE STRING,
CORGN TYPE STRING,
CHIRD TYPE STRING,
WOLIM TYPE STRING,
WOHRS TYPE STRING,
CWOSI TYPE STRING,
PERMS TYPE STRING,
YRKEC TYPE STRING,
YRKEL TYPE STRING,
COCCU TYPE STRING,END OF T_EKKO_STR.
DATA: WA_P20_AAREG_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_P20_AAREG_STR-MANDT sy-vline 
WA_P20_AAREG_STR-PERNR sy-vline 
WA_P20_AAREG_STR-BEGDA sy-vline 
WA_P20_AAREG_STR-ENDDA sy-vline 
WA_P20_AAREG_STR-RDATE sy-vline 
WA_P20_AAREG_STR-STAT2 sy-vline 
WA_P20_AAREG_STR-ORGNJ sy-vline 
WA_P20_AAREG_STR-ORGNB sy-vline 
WA_P20_AAREG_STR-CORGN sy-vline 
WA_P20_AAREG_STR-CHIRD sy-vline 
WA_P20_AAREG_STR-WOLIM sy-vline 
WA_P20_AAREG_STR-WOHRS sy-vline 
WA_P20_AAREG_STR-CWOSI sy-vline 
WA_P20_AAREG_STR-PERMS sy-vline 
WA_P20_AAREG_STR-YRKEC sy-vline 
WA_P20_AAREG_STR-YRKEL sy-vline 
WA_P20_AAREG_STR-COCCU sy-vline      INTO ld_text SEPARATED BY SPACE.

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