ABAP Select data from SAP table POEXT into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM POEXT
*  INTO TABLE @DATA(IT_POEXT2).
*--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_POEXT INDEX 1 INTO DATA(WA_POEXT2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<POEXT>-MANDT = 1.
<POEXT>-EBELN = 1.
<POEXT>-EBELP = 1.
<POEXT>-DUMMY1 = 1.
<POEXT>-TM_CTRL_KEY = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_POEXT-MSR_PO_TYPE, sy-vline,
  WA_POEXT-DUMMY5, sy-vline,
  WA_POEXT-PS_PA_ID_HDR, sy-vline,
  WA_POEXT-PS_PA_CLNG_HDR, sy-vline,
  WA_POEXT-DUMMY2, sy-vline,
  WA_POEXT-FASTPAY, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_POEXT 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_POEXT 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_POEXT INTO WA_POEXT.


*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 EBELN
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_POEXT-EBELN
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_POEXT-EBELN.
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_POEXT_STR, 
MANDT TYPE STRING,
EBELN TYPE STRING,
EBELP TYPE STRING,
DUMMY1 TYPE STRING,
TM_CTRL_KEY TYPE STRING,
MSR_PO_TYPE TYPE STRING,
DUMMY5 TYPE STRING,
PS_PA_ID_HDR TYPE STRING,
PS_PA_CLNG_HDR TYPE STRING,
DUMMY2 TYPE STRING,
FASTPAY TYPE STRING,
PPA_EX_IND TYPE STRING,
PEROP_BEG TYPE STRING,
PEROP_END TYPE STRING,
PS_INFU_IND TYPE STRING,
PS_PA_ID TYPE STRING,
PS_PA_MIN_FEE TYPE STRING,
PS_PA_MAX_FEE TYPE STRING,
PS_PA_GS_BLW TYPE STRING,
PS_PA_GS_ABV TYPE STRING,
PS_PA_CLNG_AMT TYPE STRING,
PS_PA_TOTL_AMT TYPE STRING,
PS_PA_NTE_IND TYPE STRING,
PS_PA_NSP_IND TYPE STRING,
PS_PA_COMP_KEY TYPE STRING,
PS_PA_COMP_TYPE TYPE STRING,
DUMMY3 TYPE STRING,
DUMMY4 TYPE STRING,
_DATAAGING TYPE STRING,END OF T_EKKO_STR.
DATA: WA_POEXT_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_POEXT_STR-MANDT sy-vline 
WA_POEXT_STR-EBELN sy-vline 
WA_POEXT_STR-EBELP sy-vline 
WA_POEXT_STR-DUMMY1 sy-vline 
WA_POEXT_STR-TM_CTRL_KEY sy-vline 
WA_POEXT_STR-MSR_PO_TYPE sy-vline 
WA_POEXT_STR-DUMMY5 sy-vline 
WA_POEXT_STR-PS_PA_ID_HDR sy-vline 
WA_POEXT_STR-PS_PA_CLNG_HDR sy-vline 
WA_POEXT_STR-DUMMY2 sy-vline 
WA_POEXT_STR-FASTPAY sy-vline 
WA_POEXT_STR-PPA_EX_IND sy-vline 
WA_POEXT_STR-PEROP_BEG sy-vline 
WA_POEXT_STR-PEROP_END sy-vline 
WA_POEXT_STR-PS_INFU_IND sy-vline 
WA_POEXT_STR-PS_PA_ID sy-vline 
WA_POEXT_STR-PS_PA_MIN_FEE sy-vline 
WA_POEXT_STR-PS_PA_MAX_FEE sy-vline 
WA_POEXT_STR-PS_PA_GS_BLW sy-vline 
WA_POEXT_STR-PS_PA_GS_ABV sy-vline 
WA_POEXT_STR-PS_PA_CLNG_AMT sy-vline 
WA_POEXT_STR-PS_PA_TOTL_AMT sy-vline 
WA_POEXT_STR-PS_PA_NTE_IND sy-vline 
WA_POEXT_STR-PS_PA_NSP_IND sy-vline 
WA_POEXT_STR-PS_PA_COMP_KEY sy-vline 
WA_POEXT_STR-PS_PA_COMP_TYPE sy-vline 
WA_POEXT_STR-DUMMY3 sy-vline 
WA_POEXT_STR-DUMMY4 sy-vline 
WA_POEXT_STR-_DATAAGING sy-vline      INTO ld_text SEPARATED BY SPACE.

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