ABAP Select data from SAP table ISPURCHASEREQUISITION_WD into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM ISPURCHASEREQUISITION_WD
*  INTO TABLE @DATA(IT_ISPURCHASEREQUISITION_WD2).
*--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_ISPURCHASEREQUISITION_WD INDEX 1 INTO DATA(WA_ISPURCHASEREQUISITION_WD2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<ISPURCHASEREQUISITION_WD>-KEY = 1.
<ISPURCHASEREQUISITION_WD>-PARENT_KEY = 1.
<ISPURCHASEREQUISITION_WD>-ROOT_KEY = 1.
<ISPURCHASEREQUISITION_WD>-PURCHASEREQUISITION = 1.
<ISPURCHASEREQUISITION_WD>-PURREQNSSPREQUESTOR = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_ISPURCHASEREQUISITION_WD-PURREQNEMPLBYCOOFAUTHOR, sy-vline,
  WA_ISPURCHASEREQUISITION_WD-PURREQNEMPLBYREQNGRPOFAUTHOR, sy-vline,
  WA_ISPURCHASEREQUISITION_WD-PURREQNSSPAUTHOR, sy-vline,
  WA_ISPURCHASEREQUISITION_WD-PURCHASEREQUISITIONTYPE, sy-vline,
  WA_ISPURCHASEREQUISITION_WD-CREATIONDATE, sy-vline,
  WA_ISPURCHASEREQUISITION_WD-LASTCHANGEDATETIME, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_ISPURCHASEREQUISITION_WD 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_ISPURCHASEREQUISITION_WD 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_ISPURCHASEREQUISITION_WD INTO WA_ISPURCHASEREQUISITION_WD.


*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_ISPURCHASEREQUISITION_WD-PURCHASEREQUISITION
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_ISPURCHASEREQUISITION_WD-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_ISPURCHASEREQUISITION_WD_STR, 
KEY TYPE STRING,
PARENT_KEY TYPE STRING,
ROOT_KEY TYPE STRING,
PURCHASEREQUISITION TYPE STRING,
PURREQNSSPREQUESTOR TYPE STRING,
PURREQNEMPLBYCOOFAUTHOR TYPE STRING,
PURREQNEMPLBYREQNGRPOFAUTHOR TYPE STRING,
PURREQNSSPAUTHOR TYPE STRING,
PURCHASEREQUISITIONTYPE TYPE STRING,
CREATIONDATE TYPE STRING,
LASTCHANGEDATETIME TYPE STRING,
ISONBEHALFCART TYPE STRING,
BUSINESSUSER TYPE STRING,
ISPURREQNOVRLREL TYPE STRING,
PURREQNISCREATEDINEXPERTMODE TYPE STRING,
PURREQNDESCRIPTION TYPE STRING,
EMPLOYEEFULLNAME TYPE STRING,
PURREQNORIGIN TYPE STRING,
ISSRCHENABLED TYPE STRING,
PURREQNLIFECYCLESTATUS TYPE STRING,
PURREQNLIFECYCLESTATUSNAME TYPE STRING,
NUMBEROFITEMS TYPE STRING,
TOTALNETAMOUNT TYPE STRING,
CURRENCY TYPE STRING,
ISEXTPURGSCENARIO TYPE STRING,
PURREQNISCOPYDRAFT TYPE STRING,
PURREQNSOURCEAPPLICATION TYPE STRING,
PURREQNREJECTIONISCANCELLED TYPE STRING,
PURREQNREWORKCOMMENTTEXT TYPE STRING,
HASACTIVEENTITY TYPE STRING,
DRAFTENTITYCREATIONDATETIME TYPE STRING,
DRAFTENTITYLASTCHANGEDATETIME TYPE STRING,
DRAFTADMINISTRATIVEDATAUUID TYPE STRING,
DRAFTENTITYCONSISTENCYSTATUS TYPE STRING,
DRAFTENTITYOPERATIONCODE TYPE STRING,
ISACTIVEENTITY TYPE STRING,END OF T_EKKO_STR.
DATA: WA_ISPURCHASEREQUISITION_WD_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_ISPURCHASEREQUISITION_WD_STR-KEY sy-vline 
WA_ISPURCHASEREQUISITION_WD_STR-PARENT_KEY sy-vline 
WA_ISPURCHASEREQUISITION_WD_STR-ROOT_KEY sy-vline 
WA_ISPURCHASEREQUISITION_WD_STR-PURCHASEREQUISITION sy-vline 
WA_ISPURCHASEREQUISITION_WD_STR-PURREQNSSPREQUESTOR sy-vline 
WA_ISPURCHASEREQUISITION_WD_STR-PURREQNEMPLBYCOOFAUTHOR sy-vline 
WA_ISPURCHASEREQUISITION_WD_STR-PURREQNEMPLBYREQNGRPOFAUTHOR sy-vline 
WA_ISPURCHASEREQUISITION_WD_STR-PURREQNSSPAUTHOR sy-vline 
WA_ISPURCHASEREQUISITION_WD_STR-PURCHASEREQUISITIONTYPE sy-vline 
WA_ISPURCHASEREQUISITION_WD_STR-CREATIONDATE sy-vline 
WA_ISPURCHASEREQUISITION_WD_STR-LASTCHANGEDATETIME sy-vline 
WA_ISPURCHASEREQUISITION_WD_STR-ISONBEHALFCART sy-vline 
WA_ISPURCHASEREQUISITION_WD_STR-BUSINESSUSER sy-vline 
WA_ISPURCHASEREQUISITION_WD_STR-ISPURREQNOVRLREL sy-vline 
WA_ISPURCHASEREQUISITION_WD_STR-PURREQNISCREATEDINEXPERTMODE sy-vline 
WA_ISPURCHASEREQUISITION_WD_STR-PURREQNDESCRIPTION sy-vline 
WA_ISPURCHASEREQUISITION_WD_STR-EMPLOYEEFULLNAME sy-vline 
WA_ISPURCHASEREQUISITION_WD_STR-PURREQNORIGIN sy-vline 
WA_ISPURCHASEREQUISITION_WD_STR-ISSRCHENABLED sy-vline 
WA_ISPURCHASEREQUISITION_WD_STR-PURREQNLIFECYCLESTATUS sy-vline 
WA_ISPURCHASEREQUISITION_WD_STR-PURREQNLIFECYCLESTATUSNAME sy-vline 
WA_ISPURCHASEREQUISITION_WD_STR-NUMBEROFITEMS sy-vline 
WA_ISPURCHASEREQUISITION_WD_STR-TOTALNETAMOUNT sy-vline 
WA_ISPURCHASEREQUISITION_WD_STR-CURRENCY sy-vline 
WA_ISPURCHASEREQUISITION_WD_STR-ISEXTPURGSCENARIO sy-vline 
WA_ISPURCHASEREQUISITION_WD_STR-PURREQNISCOPYDRAFT sy-vline 
WA_ISPURCHASEREQUISITION_WD_STR-PURREQNSOURCEAPPLICATION sy-vline 
WA_ISPURCHASEREQUISITION_WD_STR-PURREQNREJECTIONISCANCELLED sy-vline 
WA_ISPURCHASEREQUISITION_WD_STR-PURREQNREWORKCOMMENTTEXT sy-vline 
WA_ISPURCHASEREQUISITION_WD_STR-HASACTIVEENTITY sy-vline 
WA_ISPURCHASEREQUISITION_WD_STR-DRAFTENTITYCREATIONDATETIME sy-vline 
WA_ISPURCHASEREQUISITION_WD_STR-DRAFTENTITYLASTCHANGEDATETIME sy-vline 
WA_ISPURCHASEREQUISITION_WD_STR-DRAFTADMINISTRATIVEDATAUUID sy-vline 
WA_ISPURCHASEREQUISITION_WD_STR-DRAFTENTITYCONSISTENCYSTATUS sy-vline 
WA_ISPURCHASEREQUISITION_WD_STR-DRAFTENTITYOPERATIONCODE sy-vline 
WA_ISPURCHASEREQUISITION_WD_STR-ISACTIVEENTITY sy-vline      INTO ld_text SEPARATED BY SPACE.

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