ABAP Select data from SAP table API_PNRL_DOWN_STRUC into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM API_PNRL_DOWN_STRUC
*  INTO TABLE @DATA(IT_API_PNRL_DOWN_STRUC2).
*--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_API_PNRL_DOWN_STRUC INDEX 1 INTO DATA(WA_API_PNRL_DOWN_STRUC2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<API_PNRL_DOWN_STRUC>-MARK = 1.
<API_PNRL_DOWN_STRUC>-ALTNUM1 = 1.
<API_PNRL_DOWN_STRUC>-CLINT1 = 1.
<API_PNRL_DOWN_STRUC>-PNAME1 = 1.
<API_PNRL_DOWN_STRUC>-CLASS1 = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_API_PNRL_DOWN_STRUC-KLART1, sy-vline,
  WA_API_PNRL_DOWN_STRUC-PNTYPE1, sy-vline,
  WA_API_PNRL_DOWN_STRUC-ALTNUM2, sy-vline,
  WA_API_PNRL_DOWN_STRUC-CLINT2, sy-vline,
  WA_API_PNRL_DOWN_STRUC-PNAME2, sy-vline,
  WA_API_PNRL_DOWN_STRUC-CLASS2, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_API_PNRL_DOWN_STRUC 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_API_PNRL_DOWN_STRUC 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_API_PNRL_DOWN_STRUC INTO WA_API_PNRL_DOWN_STRUC.


*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 ALTNUM1
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_API_PNRL_DOWN_STRUC-ALTNUM1
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_API_PNRL_DOWN_STRUC-ALTNUM1.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field ALTNUM2
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_API_PNRL_DOWN_STRUC-ALTNUM2
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_API_PNRL_DOWN_STRUC-ALTNUM2.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field LOGSYS
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_API_PNRL_DOWN_STRUC-LOGSYS
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_API_PNRL_DOWN_STRUC-LOGSYS.
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_API_PNRL_DOWN_STRUC_STR, 
MARK TYPE STRING,
ALTNUM1 TYPE STRING,
CLINT1 TYPE STRING,
PNAME1 TYPE STRING,
CLASS1 TYPE STRING,
KLART1 TYPE STRING,
PNTYPE1 TYPE STRING,
ALTNUM2 TYPE STRING,
CLINT2 TYPE STRING,
PNAME2 TYPE STRING,
CLASS2 TYPE STRING,
KLART2 TYPE STRING,
PNTYPE2 TYPE STRING,
PLEVEL TYPE STRING,
DIRECT TYPE STRING,
PRGUID TYPE STRING,
PRTYPE TYPE STRING,
APPLREL_TYPE TYPE STRING,
OTYPE1 TYPE STRING,
PNGUID1 TYPE STRING,
PVGUID1 TYPE STRING,
PAGUID1 TYPE STRING,
GUID1 TYPE STRING,
OTYPE2 TYPE STRING,
PNGUID2 TYPE STRING,
PVGUID2 TYPE STRING,
PAGUID2 TYPE STRING,
GUID2 TYPE STRING,
PREL_TYPE TYPE STRING,
CREADAT TYPE STRING,
CREABY TYPE STRING,
CHNGDAT TYPE STRING,
CHNGBY TYPE STRING,
LOGSYS TYPE STRING,
UPDKZ TYPE STRING,END OF T_EKKO_STR.
DATA: WA_API_PNRL_DOWN_STRUC_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_API_PNRL_DOWN_STRUC_STR-MARK sy-vline 
WA_API_PNRL_DOWN_STRUC_STR-ALTNUM1 sy-vline 
WA_API_PNRL_DOWN_STRUC_STR-CLINT1 sy-vline 
WA_API_PNRL_DOWN_STRUC_STR-PNAME1 sy-vline 
WA_API_PNRL_DOWN_STRUC_STR-CLASS1 sy-vline 
WA_API_PNRL_DOWN_STRUC_STR-KLART1 sy-vline 
WA_API_PNRL_DOWN_STRUC_STR-PNTYPE1 sy-vline 
WA_API_PNRL_DOWN_STRUC_STR-ALTNUM2 sy-vline 
WA_API_PNRL_DOWN_STRUC_STR-CLINT2 sy-vline 
WA_API_PNRL_DOWN_STRUC_STR-PNAME2 sy-vline 
WA_API_PNRL_DOWN_STRUC_STR-CLASS2 sy-vline 
WA_API_PNRL_DOWN_STRUC_STR-KLART2 sy-vline 
WA_API_PNRL_DOWN_STRUC_STR-PNTYPE2 sy-vline 
WA_API_PNRL_DOWN_STRUC_STR-PLEVEL sy-vline 
WA_API_PNRL_DOWN_STRUC_STR-DIRECT sy-vline 
WA_API_PNRL_DOWN_STRUC_STR-PRGUID sy-vline 
WA_API_PNRL_DOWN_STRUC_STR-PRTYPE sy-vline 
WA_API_PNRL_DOWN_STRUC_STR-APPLREL_TYPE sy-vline 
WA_API_PNRL_DOWN_STRUC_STR-OTYPE1 sy-vline 
WA_API_PNRL_DOWN_STRUC_STR-PNGUID1 sy-vline 
WA_API_PNRL_DOWN_STRUC_STR-PVGUID1 sy-vline 
WA_API_PNRL_DOWN_STRUC_STR-PAGUID1 sy-vline 
WA_API_PNRL_DOWN_STRUC_STR-GUID1 sy-vline 
WA_API_PNRL_DOWN_STRUC_STR-OTYPE2 sy-vline 
WA_API_PNRL_DOWN_STRUC_STR-PNGUID2 sy-vline 
WA_API_PNRL_DOWN_STRUC_STR-PVGUID2 sy-vline 
WA_API_PNRL_DOWN_STRUC_STR-PAGUID2 sy-vline 
WA_API_PNRL_DOWN_STRUC_STR-GUID2 sy-vline 
WA_API_PNRL_DOWN_STRUC_STR-PREL_TYPE sy-vline 
WA_API_PNRL_DOWN_STRUC_STR-CREADAT sy-vline 
WA_API_PNRL_DOWN_STRUC_STR-CREABY sy-vline 
WA_API_PNRL_DOWN_STRUC_STR-CHNGDAT sy-vline 
WA_API_PNRL_DOWN_STRUC_STR-CHNGBY sy-vline 
WA_API_PNRL_DOWN_STRUC_STR-LOGSYS sy-vline 
WA_API_PNRL_DOWN_STRUC_STR-UPDKZ sy-vline      INTO ld_text SEPARATED BY SPACE.

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