ABAP Select data from SAP table PEKKO into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM PEKKO
*  INTO TABLE @DATA(IT_PEKKO2).
*--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_PEKKO INDEX 1 INTO DATA(WA_PEKKO2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<PEKKO>-EMLIF = 1.
<PEKKO>-LPEIN = 1.
<PEKKO>-EINDT = 1.
<PEKKO>-WERKS = 1.
<PEKKO>-LFDAT = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_PEKKO-LABNR, sy-vline,
  WA_PEKKO-PRITX, sy-vline,
  WA_PEKKO-ZBTXT, sy-vline,
  WA_PEKKO-NETWR, sy-vline,
  WA_PEKKO-KZABS, sy-vline,
  WA_PEKKO-ADRNR, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_PEKKO 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_PEKKO 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_PEKKO INTO WA_PEKKO.


*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.

*Conversion exit ALPHA, internal->external for field EMLIF
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_PEKKO-EMLIF
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_PEKKO-EMLIF.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field ADRNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_PEKKO-ADRNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_PEKKO-ADRNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field KUNNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_PEKKO-KUNNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_PEKKO-KUNNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field ADRN2
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_PEKKO-ADRN2
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_PEKKO-ADRN2.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field MSR_ID
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_PEKKO-MSR_ID
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_PEKKO-MSR_ID.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field PERSNUMBER
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_PEKKO-PERSNUMBER
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_PEKKO-PERSNUMBER.
WRITE:/ 'New Value:', ld_input.
ENDFORM. 

*&---------------------------------------------------------------------*
*& Form process_as_string_field_values
*&---------------------------------------------------------------------*
FORM process_as_string_field_values CHANGING p_EKKO LIKE wa_EKKO.

TYPES: BEGIN OF T_PEKKO_STR, 
EMLIF TYPE STRING,
LPEIN TYPE STRING,
EINDT TYPE STRING,
WERKS TYPE STRING,
LFDAT TYPE STRING,
LABNR TYPE STRING,
PRITX TYPE STRING,
ZBTXT TYPE STRING,
NETWR TYPE STRING,
KZABS TYPE STRING,
ADRNR TYPE STRING,
KUNNR TYPE STRING,
INCO1 TYPE STRING,
INCO2 TYPE STRING,
ADRN2 TYPE STRING,
DRUNR TYPE STRING,
DRDAT TYPE STRING,
DRUHR TYPE STRING,
HSAMM TYPE STRING,
PRSDR TYPE STRING,
WEMPF TYPE STRING,
ABLAD TYPE STRING,
MSR_ID TYPE STRING,
INCO2_L TYPE STRING,
INCO3_L TYPE STRING,
PERSNUMBER TYPE STRING,END OF T_EKKO_STR.
DATA: WA_PEKKO_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_PEKKO_STR-EMLIF sy-vline 
WA_PEKKO_STR-LPEIN sy-vline 
WA_PEKKO_STR-EINDT sy-vline 
WA_PEKKO_STR-WERKS sy-vline 
WA_PEKKO_STR-LFDAT sy-vline 
WA_PEKKO_STR-LABNR sy-vline 
WA_PEKKO_STR-PRITX sy-vline 
WA_PEKKO_STR-ZBTXT sy-vline 
WA_PEKKO_STR-NETWR sy-vline 
WA_PEKKO_STR-KZABS sy-vline 
WA_PEKKO_STR-ADRNR sy-vline 
WA_PEKKO_STR-KUNNR sy-vline 
WA_PEKKO_STR-INCO1 sy-vline 
WA_PEKKO_STR-INCO2 sy-vline 
WA_PEKKO_STR-ADRN2 sy-vline 
WA_PEKKO_STR-DRUNR sy-vline 
WA_PEKKO_STR-DRDAT sy-vline 
WA_PEKKO_STR-DRUHR sy-vline 
WA_PEKKO_STR-HSAMM sy-vline 
WA_PEKKO_STR-PRSDR sy-vline 
WA_PEKKO_STR-WEMPF sy-vline 
WA_PEKKO_STR-ABLAD sy-vline 
WA_PEKKO_STR-MSR_ID sy-vline 
WA_PEKKO_STR-INCO2_L sy-vline 
WA_PEKKO_STR-INCO3_L sy-vline 
WA_PEKKO_STR-PERSNUMBER sy-vline      INTO ld_text SEPARATED BY SPACE.

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