ABAP Select data from SAP table CDS_AB_ITEMS_P into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM CDS_AB_ITEMS_P
*  INTO TABLE @DATA(IT_CDS_AB_ITEMS_P2).
*--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_CDS_AB_ITEMS_P INDEX 1 INTO DATA(WA_CDS_AB_ITEMS_P2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<CDS_AB_ITEMS_P>-MANDT = 1.
<CDS_AB_ITEMS_P>-WBELN = 1.
<CDS_AB_ITEMS_P>-POSNR = 1.
<CDS_AB_ITEMS_P>-MATNR = 1.
<CDS_AB_ITEMS_P>-ARKTX = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_CDS_AB_ITEMS_P-MATKL, sy-vline,
  WA_CDS_AB_ITEMS_P-WERKS, sy-vline,
  WA_CDS_AB_ITEMS_P-CHARG, sy-vline,
  WA_CDS_AB_ITEMS_P-MWSKZ, sy-vline,
  WA_CDS_AB_ITEMS_P-MWSK2, sy-vline,
  WA_CDS_AB_ITEMS_P-TXJCD, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_CDS_AB_ITEMS_P 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_CDS_AB_ITEMS_P 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_CDS_AB_ITEMS_P INTO WA_CDS_AB_ITEMS_P.


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

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

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

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

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

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

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

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

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

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

*Conversion exit CUNIT, internal->external for field MEINS
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_CDS_AB_ITEMS_P-MEINS
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_CDS_AB_ITEMS_P-MEINS.
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_CDS_AB_ITEMS_P_STR, 
MANDT TYPE STRING,
WBELN TYPE STRING,
POSNR TYPE STRING,
MATNR TYPE STRING,
ARKTX TYPE STRING,
MATKL TYPE STRING,
WERKS TYPE STRING,
CHARG TYPE STRING,
MWSKZ TYPE STRING,
MWSK2 TYPE STRING,
TXJCD TYPE STRING,
LFGRU TYPE STRING,
CUSTOMER TYPE STRING,
ITEMCAT TYPE STRING,
IDNLF TYPE STRING,
LTSNR TYPE STRING,
AKTNR TYPE STRING,
EKKOL TYPE STRING,
KOLIF TYPE STRING,
KOSTL TYPE STRING,
KOSTLD TYPE STRING,
PRCTR TYPE STRING,
PRCTRD TYPE STRING,
FTYPV_V TYPE STRING,
WBELN_V TYPE STRING,
POSNR_V TYPE STRING,
INCOV_P TYPE STRING,
INCO1_P TYPE STRING,
INCO2_P TYPE STRING,
INCO2_L_P TYPE STRING,
INCO3_L_P TYPE STRING,
UMREZ TYPE STRING,
UMREN TYPE STRING,
WFKME TYPE STRING,
MEINS TYPE STRING,
MENGE TYPE STRING,
NETWR TYPE STRING,
NETWRD TYPE STRING,END OF T_EKKO_STR.
DATA: WA_CDS_AB_ITEMS_P_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_CDS_AB_ITEMS_P_STR-MANDT sy-vline 
WA_CDS_AB_ITEMS_P_STR-WBELN sy-vline 
WA_CDS_AB_ITEMS_P_STR-POSNR sy-vline 
WA_CDS_AB_ITEMS_P_STR-MATNR sy-vline 
WA_CDS_AB_ITEMS_P_STR-ARKTX sy-vline 
WA_CDS_AB_ITEMS_P_STR-MATKL sy-vline 
WA_CDS_AB_ITEMS_P_STR-WERKS sy-vline 
WA_CDS_AB_ITEMS_P_STR-CHARG sy-vline 
WA_CDS_AB_ITEMS_P_STR-MWSKZ sy-vline 
WA_CDS_AB_ITEMS_P_STR-MWSK2 sy-vline 
WA_CDS_AB_ITEMS_P_STR-TXJCD sy-vline 
WA_CDS_AB_ITEMS_P_STR-LFGRU sy-vline 
WA_CDS_AB_ITEMS_P_STR-CUSTOMER sy-vline 
WA_CDS_AB_ITEMS_P_STR-ITEMCAT sy-vline 
WA_CDS_AB_ITEMS_P_STR-IDNLF sy-vline 
WA_CDS_AB_ITEMS_P_STR-LTSNR sy-vline 
WA_CDS_AB_ITEMS_P_STR-AKTNR sy-vline 
WA_CDS_AB_ITEMS_P_STR-EKKOL sy-vline 
WA_CDS_AB_ITEMS_P_STR-KOLIF sy-vline 
WA_CDS_AB_ITEMS_P_STR-KOSTL sy-vline 
WA_CDS_AB_ITEMS_P_STR-KOSTLD sy-vline 
WA_CDS_AB_ITEMS_P_STR-PRCTR sy-vline 
WA_CDS_AB_ITEMS_P_STR-PRCTRD sy-vline 
WA_CDS_AB_ITEMS_P_STR-FTYPV_V sy-vline 
WA_CDS_AB_ITEMS_P_STR-WBELN_V sy-vline 
WA_CDS_AB_ITEMS_P_STR-POSNR_V sy-vline 
WA_CDS_AB_ITEMS_P_STR-INCOV_P sy-vline 
WA_CDS_AB_ITEMS_P_STR-INCO1_P sy-vline 
WA_CDS_AB_ITEMS_P_STR-INCO2_P sy-vline 
WA_CDS_AB_ITEMS_P_STR-INCO2_L_P sy-vline 
WA_CDS_AB_ITEMS_P_STR-INCO3_L_P sy-vline 
WA_CDS_AB_ITEMS_P_STR-UMREZ sy-vline 
WA_CDS_AB_ITEMS_P_STR-UMREN sy-vline 
WA_CDS_AB_ITEMS_P_STR-WFKME sy-vline 
WA_CDS_AB_ITEMS_P_STR-MEINS sy-vline 
WA_CDS_AB_ITEMS_P_STR-MENGE sy-vline 
WA_CDS_AB_ITEMS_P_STR-NETWR sy-vline 
WA_CDS_AB_ITEMS_P_STR-NETWRD sy-vline      INTO ld_text SEPARATED BY SPACE.

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