ABAP Select data from SAP table MMPUR_CPR_S_HDR into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP MMPUR_CPR_S_HDR 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_CPR_S_HDR. 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_CPR_S_HDR 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_CPR_S_HDR TYPE STANDARD TABLE OF MMPUR_CPR_S_HDR,
      WA_MMPUR_CPR_S_HDR TYPE MMPUR_CPR_S_HDR,
      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_CPR_S_HDR> TYPE MMPUR_CPR_S_HDR.

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM MMPUR_CPR_S_HDR
*  INTO TABLE @DATA(IT_MMPUR_CPR_S_HDR2).
*--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_CPR_S_HDR INDEX 1 INTO DATA(WA_MMPUR_CPR_S_HDR2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<MMPUR_CPR_S_HDR>-PURCHASEREQUISITION = 1.
<MMPUR_CPR_S_HDR>-NUMBEROFITEMS = 1.
<MMPUR_CPR_S_HDR>-PURCHASEREQUISITIONTYPE = 1.
<MMPUR_CPR_S_HDR>-EXTCOMPANYCODEFORPURG = 1.
<MMPUR_CPR_S_HDR>-PURREQNORIGIN = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_MMPUR_CPR_S_HDR-TOTALAMOUNT, sy-vline,
  WA_MMPUR_CPR_S_HDR-CURRENCY, sy-vline,
  WA_MMPUR_CPR_S_HDR-PURREQNSSPREQUESTOR, sy-vline,
  WA_MMPUR_CPR_S_HDR-PURREQNSSPAUTHOR, sy-vline,
  WA_MMPUR_CPR_S_HDR-EXTSOURCESYSTEM, sy-vline,
ENDLOOP.
   
*Add any further fields from structure WA_MMPUR_CPR_S_HDR 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_CPR_S_HDR 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_CPR_S_HDR INTO WA_MMPUR_CPR_S_HDR.


*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 PURCHASEREQUISITION
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_MMPUR_CPR_S_HDR-PURCHASEREQUISITION
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MMPUR_CPR_S_HDR-PURCHASEREQUISITION.
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_CPR_S_HDR_STR, 
PURCHASEREQUISITION TYPE STRING,
NUMBEROFITEMS TYPE STRING,
PURCHASEREQUISITIONTYPE TYPE STRING,
EXTCOMPANYCODEFORPURG TYPE STRING,
PURREQNORIGIN TYPE STRING,
TOTALAMOUNT TYPE STRING,
CURRENCY TYPE STRING,
PURREQNSSPREQUESTOR TYPE STRING,
PURREQNSSPAUTHOR TYPE STRING,
EXTSOURCESYSTEM TYPE STRING,END OF T_EKKO_STR.
DATA: WA_MMPUR_CPR_S_HDR_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_CPR_S_HDR_STR-PURCHASEREQUISITION sy-vline 
WA_MMPUR_CPR_S_HDR_STR-NUMBEROFITEMS sy-vline 
WA_MMPUR_CPR_S_HDR_STR-PURCHASEREQUISITIONTYPE sy-vline 
WA_MMPUR_CPR_S_HDR_STR-EXTCOMPANYCODEFORPURG sy-vline 
WA_MMPUR_CPR_S_HDR_STR-PURREQNORIGIN sy-vline 
WA_MMPUR_CPR_S_HDR_STR-TOTALAMOUNT sy-vline 
WA_MMPUR_CPR_S_HDR_STR-CURRENCY sy-vline 
WA_MMPUR_CPR_S_HDR_STR-PURREQNSSPREQUESTOR sy-vline 
WA_MMPUR_CPR_S_HDR_STR-PURREQNSSPAUTHOR sy-vline 
WA_MMPUR_CPR_S_HDR_STR-EXTSOURCESYSTEM sy-vline      INTO ld_text SEPARATED BY SPACE.

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