ABAP Select data from SAP table P20_LNEES into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP P20_LNEES 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_LNEES. 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_LNEES 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_LNEES TYPE STANDARD TABLE OF P20_LNEES,
      WA_P20_LNEES TYPE P20_LNEES,
      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_LNEES> TYPE P20_LNEES.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_P20_LNEES.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM P20_LNEES
  INTO TABLE IT_P20_LNEES.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM P20_LNEES
*  INTO TABLE @DATA(IT_P20_LNEES2).
*--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_LNEES INDEX 1 INTO DATA(WA_P20_LNEES2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_P20_LNEES ASSIGNING <P20_LNEES>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<P20_LNEES>-RECART = 1.
<P20_LNEES>-RECTYP = 1.
<P20_LNEES>-ORGNO = 1.
<P20_LNEES>-FDNUM = 1.
<P20_LNEES>-LNACNO = 1.

ENDLOOP.

LOOP AT IT_P20_LNEES INTO WA_P20_LNEES.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_P20_LNEES-MUNIC, sy-vline,
  WA_P20_LNEES-LNLOIN, sy-vline,
  WA_P20_LNEES-LNREIN, sy-vline,
  WA_P20_LNEES-LNDEIN, sy-vline,
  WA_P20_LNEES-LNRENP, sy-vline,
  WA_P20_LNEES-LNNPIN, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_P20_LNEES 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_LNEES 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_LNEES INTO WA_P20_LNEES.


*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_LNEES_STR, 
RECART TYPE STRING,
RECTYP TYPE STRING,
ORGNO TYPE STRING,
FDNUM TYPE STRING,
LNACNO TYPE STRING,
MUNIC TYPE STRING,
LNLOIN TYPE STRING,
LNREIN TYPE STRING,
LNDEIN TYPE STRING,
LNRENP TYPE STRING,
LNNPIN TYPE STRING,
LNLOAN TYPE STRING,
LNDEPO TYPE STRING,
LNCORR TYPE STRING,
LNNACH TYPE STRING,
LNVORN TYPE STRING,
LNADD1 TYPE STRING,
LNADD2 TYPE STRING,
LNPST2 TYPE STRING,
LNMUOW TYPE STRING,
LNMANA TYPE STRING,
MFDNUM TYPE STRING,
LNMUMA TYPE STRING,
LNACTA TYPE STRING,
LNSECT TYPE STRING,END OF T_EKKO_STR.
DATA: WA_P20_LNEES_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_LNEES_STR-RECART sy-vline 
WA_P20_LNEES_STR-RECTYP sy-vline 
WA_P20_LNEES_STR-ORGNO sy-vline 
WA_P20_LNEES_STR-FDNUM sy-vline 
WA_P20_LNEES_STR-LNACNO sy-vline 
WA_P20_LNEES_STR-MUNIC sy-vline 
WA_P20_LNEES_STR-LNLOIN sy-vline 
WA_P20_LNEES_STR-LNREIN sy-vline 
WA_P20_LNEES_STR-LNDEIN sy-vline 
WA_P20_LNEES_STR-LNRENP sy-vline 
WA_P20_LNEES_STR-LNNPIN sy-vline 
WA_P20_LNEES_STR-LNLOAN sy-vline 
WA_P20_LNEES_STR-LNDEPO sy-vline 
WA_P20_LNEES_STR-LNCORR sy-vline 
WA_P20_LNEES_STR-LNNACH sy-vline 
WA_P20_LNEES_STR-LNVORN sy-vline 
WA_P20_LNEES_STR-LNADD1 sy-vline 
WA_P20_LNEES_STR-LNADD2 sy-vline 
WA_P20_LNEES_STR-LNPST2 sy-vline 
WA_P20_LNEES_STR-LNMUOW sy-vline 
WA_P20_LNEES_STR-LNMANA sy-vline 
WA_P20_LNEES_STR-MFDNUM sy-vline 
WA_P20_LNEES_STR-LNMUMA sy-vline 
WA_P20_LNEES_STR-LNACTA sy-vline 
WA_P20_LNEES_STR-LNSECT sy-vline      INTO ld_text SEPARATED BY SPACE.

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