ABAP Select data from SAP table PMMPOIDSTACK into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM PMMPOIDSTACK
*  INTO TABLE @DATA(IT_PMMPOIDSTACK2).
*--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_PMMPOIDSTACK INDEX 1 INTO DATA(WA_PMMPOIDSTACK2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<PMMPOIDSTACK>-MANDT = 1.
<PMMPOIDSTACK>-PURCHASEORDER = 1.
<PMMPOIDSTACK>-PURCHASEORDERITEM = 1.
<PMMPOIDSTACK>-PURCHASEREQUISITION = 1.
<PMMPOIDSTACK>-PURCHASEREQUISITIONITEM = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_PMMPOIDSTACK-SUPPLIER, sy-vline,
  WA_PMMPOIDSTACK-PURCHASINGORGANIZATION, sy-vline,
  WA_PMMPOIDSTACK-PURCHASINGGROUP, sy-vline,
  WA_PMMPOIDSTACK-COMPANYCODE, sy-vline,
  WA_PMMPOIDSTACK-PURCHASEORDERTYPE, sy-vline,
  WA_PMMPOIDSTACK-PURCHASEORDERDATE, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_PMMPOIDSTACK 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_PMMPOIDSTACK 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_PMMPOIDSTACK INTO WA_PMMPOIDSTACK.


*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 PURCHASEORDER
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_PMMPOIDSTACK-PURCHASEORDER
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_PMMPOIDSTACK-PURCHASEORDER.
WRITE:/ 'New Value:', ld_input.

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

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

*Conversion exit MATN1, internal->external for field MATERIAL
CALL FUNCTION 'CONVERSION_EXIT_MATN1_OUTPUT'
  EXPORTING
    input =                      WA_PMMPOIDSTACK-MATERIAL
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_PMMPOIDSTACK-MATERIAL.
WRITE:/ 'New Value:', ld_input.

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

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

*Conversion exit CUNIT, internal->external for field PURCHASEORDERQUANTITYUNIT
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_PMMPOIDSTACK-PURCHASEORDERQUANTITYUNIT
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_PMMPOIDSTACK-PURCHASEORDERQUANTITYUNIT.
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_PMMPOIDSTACK_STR, 
MANDT TYPE STRING,
PURCHASEORDER TYPE STRING,
PURCHASEORDERITEM TYPE STRING,
PURCHASEREQUISITION TYPE STRING,
PURCHASEREQUISITIONITEM TYPE STRING,
SUPPLIER TYPE STRING,
PURCHASINGORGANIZATION TYPE STRING,
PURCHASINGGROUP TYPE STRING,
COMPANYCODE TYPE STRING,
PURCHASEORDERTYPE TYPE STRING,
PURCHASEORDERDATE TYPE STRING,
CREATEDBYUSER TYPE STRING,
CURRENCY TYPE STRING,
MATERIALGROUP TYPE STRING,
MATERIAL TYPE STRING,
PLANT TYPE STRING,
PURCHASEORDERITEMCATEGORY TYPE STRING,
PURCHASEORDERCATEGORY TYPE STRING,
PURCHASECONTRACT TYPE STRING,
PURCHASECONTRACTITEM TYPE STRING,
PRODUCTTYPE TYPE STRING,
SERVICEPERFORMER TYPE STRING,
MULTIPLEACCTASSGMTDISTRIBUTION TYPE STRING,
ACCOUNTASSIGNMENTCATEGORY TYPE STRING,
PURCHASEORDERQUANTITYUNIT TYPE STRING,
DOCUMENTCURRENCY TYPE STRING,
NETAMOUNT TYPE STRING,
NETAMOUNTINREPORTINGCURRENCY TYPE STRING,
NETAMOUNTINREPORTINGCURRENCY2 TYPE STRING,
NETAMOUNTINCOCODECURRENCY TYPE STRING,
NETPRICEAMOUNT TYPE STRING,
NETPRICEINREPORTINGCURRENCY TYPE STRING,
NETPRICEINREPORTINGCURRENCY2 TYPE STRING,
NETPRICEINCOMPANYCODECRCY TYPE STRING,
ISRETURNSITEM TYPE STRING,
PURCHASINGDOCUMENTDELETIONCODE TYPE STRING,
RELEASEISNOTCOMPLETED TYPE STRING,
PURCHASINGCOMPLETENESSSTATUS TYPE STRING,
ORDERQUANTITY TYPE STRING,
ANALYTICALREPORTINGCURRENCY TYPE STRING,
ANALYTICALREPORTINGCURRENCY2 TYPE STRING,END OF T_EKKO_STR.
DATA: WA_PMMPOIDSTACK_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_PMMPOIDSTACK_STR-MANDT sy-vline 
WA_PMMPOIDSTACK_STR-PURCHASEORDER sy-vline 
WA_PMMPOIDSTACK_STR-PURCHASEORDERITEM sy-vline 
WA_PMMPOIDSTACK_STR-PURCHASEREQUISITION sy-vline 
WA_PMMPOIDSTACK_STR-PURCHASEREQUISITIONITEM sy-vline 
WA_PMMPOIDSTACK_STR-SUPPLIER sy-vline 
WA_PMMPOIDSTACK_STR-PURCHASINGORGANIZATION sy-vline 
WA_PMMPOIDSTACK_STR-PURCHASINGGROUP sy-vline 
WA_PMMPOIDSTACK_STR-COMPANYCODE sy-vline 
WA_PMMPOIDSTACK_STR-PURCHASEORDERTYPE sy-vline 
WA_PMMPOIDSTACK_STR-PURCHASEORDERDATE sy-vline 
WA_PMMPOIDSTACK_STR-CREATEDBYUSER sy-vline 
WA_PMMPOIDSTACK_STR-CURRENCY sy-vline 
WA_PMMPOIDSTACK_STR-MATERIALGROUP sy-vline 
WA_PMMPOIDSTACK_STR-MATERIAL sy-vline 
WA_PMMPOIDSTACK_STR-PLANT sy-vline 
WA_PMMPOIDSTACK_STR-PURCHASEORDERITEMCATEGORY sy-vline 
WA_PMMPOIDSTACK_STR-PURCHASEORDERCATEGORY sy-vline 
WA_PMMPOIDSTACK_STR-PURCHASECONTRACT sy-vline 
WA_PMMPOIDSTACK_STR-PURCHASECONTRACTITEM sy-vline 
WA_PMMPOIDSTACK_STR-PRODUCTTYPE sy-vline 
WA_PMMPOIDSTACK_STR-SERVICEPERFORMER sy-vline 
WA_PMMPOIDSTACK_STR-MULTIPLEACCTASSGMTDISTRIBUTION sy-vline 
WA_PMMPOIDSTACK_STR-ACCOUNTASSIGNMENTCATEGORY sy-vline 
WA_PMMPOIDSTACK_STR-PURCHASEORDERQUANTITYUNIT sy-vline 
WA_PMMPOIDSTACK_STR-DOCUMENTCURRENCY sy-vline 
WA_PMMPOIDSTACK_STR-NETAMOUNT sy-vline 
WA_PMMPOIDSTACK_STR-NETAMOUNTINREPORTINGCURRENCY sy-vline 
WA_PMMPOIDSTACK_STR-NETAMOUNTINREPORTINGCURRENCY2 sy-vline 
WA_PMMPOIDSTACK_STR-NETAMOUNTINCOCODECURRENCY sy-vline 
WA_PMMPOIDSTACK_STR-NETPRICEAMOUNT sy-vline 
WA_PMMPOIDSTACK_STR-NETPRICEINREPORTINGCURRENCY sy-vline 
WA_PMMPOIDSTACK_STR-NETPRICEINREPORTINGCURRENCY2 sy-vline 
WA_PMMPOIDSTACK_STR-NETPRICEINCOMPANYCODECRCY sy-vline 
WA_PMMPOIDSTACK_STR-ISRETURNSITEM sy-vline 
WA_PMMPOIDSTACK_STR-PURCHASINGDOCUMENTDELETIONCODE sy-vline 
WA_PMMPOIDSTACK_STR-RELEASEISNOTCOMPLETED sy-vline 
WA_PMMPOIDSTACK_STR-PURCHASINGCOMPLETENESSSTATUS sy-vline 
WA_PMMPOIDSTACK_STR-ORDERQUANTITY sy-vline 
WA_PMMPOIDSTACK_STR-ANALYTICALREPORTINGCURRENCY sy-vline 
WA_PMMPOIDSTACK_STR-ANALYTICALREPORTINGCURRENCY2 sy-vline      INTO ld_text SEPARATED BY SPACE.

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