ABAP Select data from SAP table MMPUR_PR_S_PO_HEADER into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM MMPUR_PR_S_PO_HEADER
*  INTO TABLE @DATA(IT_MMPUR_PR_S_PO_HEADER2).
*--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_MMPUR_PR_S_PO_HEADER INDEX 1 INTO DATA(WA_MMPUR_PR_S_PO_HEADER2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<MMPUR_PR_S_PO_HEADER>-KEY = 1.
<MMPUR_PR_S_PO_HEADER>-PARENT_KEY = 1.
<MMPUR_PR_S_PO_HEADER>-ROOT_KEY = 1.
<MMPUR_PR_S_PO_HEADER>-EBELN = 1.
<MMPUR_PR_S_PO_HEADER>-LIFNR = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_MMPUR_PR_S_PO_HEADER-BSART, sy-vline,
  WA_MMPUR_PR_S_PO_HEADER-BUKRS, sy-vline,
  WA_MMPUR_PR_S_PO_HEADER-EKORG, sy-vline,
  WA_MMPUR_PR_S_PO_HEADER-EKGRP, sy-vline,
  WA_MMPUR_PR_S_PO_HEADER-ELIFN, sy-vline,
  WA_MMPUR_PR_S_PO_HEADER-WAERS, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_MMPUR_PR_S_PO_HEADER 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_MMPUR_PR_S_PO_HEADER 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_MMPUR_PR_S_PO_HEADER INTO WA_MMPUR_PR_S_PO_HEADER.


*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_MMPUR_PR_S_PO_HEADER-EBELN
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MMPUR_PR_S_PO_HEADER-EBELN.
WRITE:/ 'New Value:', ld_input.

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

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

*Conversion exit EXCRT, internal->external for field WKURS
CALL FUNCTION 'CONVERSION_EXIT_EXCRT_OUTPUT'
  EXPORTING
    input =                      WA_MMPUR_PR_S_PO_HEADER-WKURS
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MMPUR_PR_S_PO_HEADER-WKURS.
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_MMPUR_PR_S_PO_HEADER_STR, 
KEY TYPE STRING,
PARENT_KEY TYPE STRING,
ROOT_KEY TYPE STRING,
EBELN TYPE STRING,
LIFNR TYPE STRING,
BSART TYPE STRING,
BUKRS TYPE STRING,
EKORG TYPE STRING,
EKGRP TYPE STRING,
ELIFN TYPE STRING,
WAERS TYPE STRING,
ZTERM TYPE STRING,
WKURS TYPE STRING,
INCO1 TYPE STRING,
INCO2 TYPE STRING,
NET_PRICE TYPE STRING,
PURCHASINGORGNAME TYPE STRING,
PURCHASINGGRPNAME TYPE STRING,
SUPPLYINGVENDORNAME TYPE STRING,
ERNAM TYPE STRING,
AEDAT TYPE STRING,
DRAFT_ID TYPE STRING,
DUMMY_EKKO_INCL_EEW_PS TYPE STRING,
STARTDATE TYPE STRING,
ENDDATE TYPE STRING,END OF T_EKKO_STR.
DATA: WA_MMPUR_PR_S_PO_HEADER_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_MMPUR_PR_S_PO_HEADER_STR-KEY sy-vline 
WA_MMPUR_PR_S_PO_HEADER_STR-PARENT_KEY sy-vline 
WA_MMPUR_PR_S_PO_HEADER_STR-ROOT_KEY sy-vline 
WA_MMPUR_PR_S_PO_HEADER_STR-EBELN sy-vline 
WA_MMPUR_PR_S_PO_HEADER_STR-LIFNR sy-vline 
WA_MMPUR_PR_S_PO_HEADER_STR-BSART sy-vline 
WA_MMPUR_PR_S_PO_HEADER_STR-BUKRS sy-vline 
WA_MMPUR_PR_S_PO_HEADER_STR-EKORG sy-vline 
WA_MMPUR_PR_S_PO_HEADER_STR-EKGRP sy-vline 
WA_MMPUR_PR_S_PO_HEADER_STR-ELIFN sy-vline 
WA_MMPUR_PR_S_PO_HEADER_STR-WAERS sy-vline 
WA_MMPUR_PR_S_PO_HEADER_STR-ZTERM sy-vline 
WA_MMPUR_PR_S_PO_HEADER_STR-WKURS sy-vline 
WA_MMPUR_PR_S_PO_HEADER_STR-INCO1 sy-vline 
WA_MMPUR_PR_S_PO_HEADER_STR-INCO2 sy-vline 
WA_MMPUR_PR_S_PO_HEADER_STR-NET_PRICE sy-vline 
WA_MMPUR_PR_S_PO_HEADER_STR-PURCHASINGORGNAME sy-vline 
WA_MMPUR_PR_S_PO_HEADER_STR-PURCHASINGGRPNAME sy-vline 
WA_MMPUR_PR_S_PO_HEADER_STR-SUPPLYINGVENDORNAME sy-vline 
WA_MMPUR_PR_S_PO_HEADER_STR-ERNAM sy-vline 
WA_MMPUR_PR_S_PO_HEADER_STR-AEDAT sy-vline 
WA_MMPUR_PR_S_PO_HEADER_STR-DRAFT_ID sy-vline 
WA_MMPUR_PR_S_PO_HEADER_STR-DUMMY_EKKO_INCL_EEW_PS sy-vline 
WA_MMPUR_PR_S_PO_HEADER_STR-STARTDATE sy-vline 
WA_MMPUR_PR_S_PO_HEADER_STR-ENDDATE sy-vline      INTO ld_text SEPARATED BY SPACE.

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