ABAP Select data from SAP table PRESERVITM into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM PRESERVITM
*  INTO TABLE @DATA(IT_PRESERVITM2).
*--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_PRESERVITM INDEX 1 INTO DATA(WA_PRESERVITM2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<PRESERVITM>-MANDT = 1.
<PRESERVITM>-RESERVATION = 1.
<PRESERVITM>-RESERVATIONITEM = 1.
<PRESERVITM>-RECORDTYPE = 1.
<PRESERVITM>-MATERIAL = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_PRESERVITM-MRPAREA, sy-vline,
  WA_PRESERVITM-REQUIREMENTTYPE, sy-vline,
  WA_PRESERVITM-MATLCOMPREQUIREMENTDATE, sy-vline,
  WA_PRESERVITM-PLANT, sy-vline,
  WA_PRESERVITM-MANUFACTURINGORDEROPERATION, sy-vline,
  WA_PRESERVITM-GOODSMOVEMENTISALLOWED, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_PRESERVITM 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_PRESERVITM 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_PRESERVITM INTO WA_PRESERVITM.


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

*Conversion exit NUMCV, internal->external for field MANUFACTURINGORDEROPERATION
CALL FUNCTION 'CONVERSION_EXIT_NUMCV_OUTPUT'
  EXPORTING
    input =                      WA_PRESERVITM-MANUFACTURINGORDEROPERATION
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_PRESERVITM-MANUFACTURINGORDEROPERATION.
WRITE:/ 'New Value:', ld_input.

*Conversion exit CUNIT, internal->external for field BASEUNIT
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_PRESERVITM-BASEUNIT
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_PRESERVITM-BASEUNIT.
WRITE:/ 'New Value:', ld_input.

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

*Conversion exit CUNIT, internal->external for field ENTRYUNIT
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_PRESERVITM-ENTRYUNIT
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_PRESERVITM-ENTRYUNIT.
WRITE:/ 'New Value:', ld_input.

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

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

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

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

*Conversion exit ALPHA, internal->external for field PLANNEDORDER
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_PRESERVITM-PLANNEDORDER
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_PRESERVITM-PLANNEDORDER.
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_PRESERVITM_STR, 
MANDT TYPE STRING,
RESERVATION TYPE STRING,
RESERVATIONITEM TYPE STRING,
RECORDTYPE TYPE STRING,
MATERIAL TYPE STRING,
MRPAREA TYPE STRING,
REQUIREMENTTYPE TYPE STRING,
MATLCOMPREQUIREMENTDATE TYPE STRING,
PLANT TYPE STRING,
MANUFACTURINGORDEROPERATION TYPE STRING,
GOODSMOVEMENTISALLOWED TYPE STRING,
STORAGELOCATION TYPE STRING,
BATCH TYPE STRING,
DEBITCREDITCODE TYPE STRING,
BASEUNIT TYPE STRING,
GLACCOUNT TYPE STRING,
GOODSMOVEMENTTYPE TYPE STRING,
ENTRYUNIT TYPE STRING,
QUANTITYISFIXED TYPE STRING,
COMPANYCODECURRENCY TYPE STRING,
ISSUINGORRECEIVINGPLANT TYPE STRING,
ISSUINGORRECEIVINGSTORAGELOC TYPE STRING,
PURCHASINGDOCUMENT TYPE STRING,
PURCHASINGDOCUMENTITEM TYPE STRING,
RESVNITMREQUIREDQTYINBASEUNIT TYPE STRING,
RESERVATIONITEMISFINALLYISSUED TYPE STRING,
RESERVATIONITMISMARKEDFORDELTN TYPE STRING,
RESVNITMREQUIREDQTYINENTRYUNIT TYPE STRING,
RESVNITMWITHDRAWNQTYINBASEUNIT TYPE STRING,
RESVNITMWITHDRAWNAMTINCCCRCY TYPE STRING,
SUPPLIER TYPE STRING,
INVENTORYSPECIALSTOCKTYPE TYPE STRING,
MATERIALCOMPONENTISPHANTOMITEM TYPE STRING,
ISBULKMATERIALCOMPONENT TYPE STRING,
MATLCOMPISTEXTITEM TYPE STRING,
PURCHASEREQUISITION TYPE STRING,
PURCHASEREQUISITIONITEM TYPE STRING,
REFERENCEORDER TYPE STRING,
MATERIALGROUP TYPE STRING,
RESERVATIONQUANTITYRQMTTIME TYPE STRING,
MATERIALCOMPONENTISMISSING TYPE STRING,
PLANNEDORDER TYPE STRING,
SCHEDULELINE TYPE STRING,
PRODUCTIONSUPPLYAREA TYPE STRING,
ISCOMPONENTQUANTITYFIXED TYPE STRING,
ISMATERIALPROVISION TYPE STRING,
PRICEUNIT TYPE STRING,
GOODSRECIPIENTNAME TYPE STRING,
UNLOADINGPOINTNAME TYPE STRING,
RESERVATIONITEMTEXT TYPE STRING,
MATERIALCOMPISPROCUREDDIRECTLY TYPE STRING,
ISSGORRCVGSPCLSTOCKIND TYPE STRING,END OF T_EKKO_STR.
DATA: WA_PRESERVITM_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_PRESERVITM_STR-MANDT sy-vline 
WA_PRESERVITM_STR-RESERVATION sy-vline 
WA_PRESERVITM_STR-RESERVATIONITEM sy-vline 
WA_PRESERVITM_STR-RECORDTYPE sy-vline 
WA_PRESERVITM_STR-MATERIAL sy-vline 
WA_PRESERVITM_STR-MRPAREA sy-vline 
WA_PRESERVITM_STR-REQUIREMENTTYPE sy-vline 
WA_PRESERVITM_STR-MATLCOMPREQUIREMENTDATE sy-vline 
WA_PRESERVITM_STR-PLANT sy-vline 
WA_PRESERVITM_STR-MANUFACTURINGORDEROPERATION sy-vline 
WA_PRESERVITM_STR-GOODSMOVEMENTISALLOWED sy-vline 
WA_PRESERVITM_STR-STORAGELOCATION sy-vline 
WA_PRESERVITM_STR-BATCH sy-vline 
WA_PRESERVITM_STR-DEBITCREDITCODE sy-vline 
WA_PRESERVITM_STR-BASEUNIT sy-vline 
WA_PRESERVITM_STR-GLACCOUNT sy-vline 
WA_PRESERVITM_STR-GOODSMOVEMENTTYPE sy-vline 
WA_PRESERVITM_STR-ENTRYUNIT sy-vline 
WA_PRESERVITM_STR-QUANTITYISFIXED sy-vline 
WA_PRESERVITM_STR-COMPANYCODECURRENCY sy-vline 
WA_PRESERVITM_STR-ISSUINGORRECEIVINGPLANT sy-vline 
WA_PRESERVITM_STR-ISSUINGORRECEIVINGSTORAGELOC sy-vline 
WA_PRESERVITM_STR-PURCHASINGDOCUMENT sy-vline 
WA_PRESERVITM_STR-PURCHASINGDOCUMENTITEM sy-vline 
WA_PRESERVITM_STR-RESVNITMREQUIREDQTYINBASEUNIT sy-vline 
WA_PRESERVITM_STR-RESERVATIONITEMISFINALLYISSUED sy-vline 
WA_PRESERVITM_STR-RESERVATIONITMISMARKEDFORDELTN sy-vline 
WA_PRESERVITM_STR-RESVNITMREQUIREDQTYINENTRYUNIT sy-vline 
WA_PRESERVITM_STR-RESVNITMWITHDRAWNQTYINBASEUNIT sy-vline 
WA_PRESERVITM_STR-RESVNITMWITHDRAWNAMTINCCCRCY sy-vline 
WA_PRESERVITM_STR-SUPPLIER sy-vline 
WA_PRESERVITM_STR-INVENTORYSPECIALSTOCKTYPE sy-vline 
WA_PRESERVITM_STR-MATERIALCOMPONENTISPHANTOMITEM sy-vline 
WA_PRESERVITM_STR-ISBULKMATERIALCOMPONENT sy-vline 
WA_PRESERVITM_STR-MATLCOMPISTEXTITEM sy-vline 
WA_PRESERVITM_STR-PURCHASEREQUISITION sy-vline 
WA_PRESERVITM_STR-PURCHASEREQUISITIONITEM sy-vline 
WA_PRESERVITM_STR-REFERENCEORDER sy-vline 
WA_PRESERVITM_STR-MATERIALGROUP sy-vline 
WA_PRESERVITM_STR-RESERVATIONQUANTITYRQMTTIME sy-vline 
WA_PRESERVITM_STR-MATERIALCOMPONENTISMISSING sy-vline 
WA_PRESERVITM_STR-PLANNEDORDER sy-vline 
WA_PRESERVITM_STR-SCHEDULELINE sy-vline 
WA_PRESERVITM_STR-PRODUCTIONSUPPLYAREA sy-vline 
WA_PRESERVITM_STR-ISCOMPONENTQUANTITYFIXED sy-vline 
WA_PRESERVITM_STR-ISMATERIALPROVISION sy-vline 
WA_PRESERVITM_STR-PRICEUNIT sy-vline 
WA_PRESERVITM_STR-GOODSRECIPIENTNAME sy-vline 
WA_PRESERVITM_STR-UNLOADINGPOINTNAME sy-vline 
WA_PRESERVITM_STR-RESERVATIONITEMTEXT sy-vline 
WA_PRESERVITM_STR-MATERIALCOMPISPROCUREDDIRECTLY sy-vline 
WA_PRESERVITM_STR-ISSGORRCVGSPCLSTOCKIND sy-vline      INTO ld_text SEPARATED BY SPACE.

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