ABAP Select data from SAP table ALPFDB_SEL_DATA_LIST into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM ALPFDB_SEL_DATA_LIST
*  INTO TABLE @DATA(IT_ALPFDB_SEL_DATA_LIST2).
*--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_ALPFDB_SEL_DATA_LIST INDEX 1 INTO DATA(WA_ALPFDB_SEL_DATA_LIST2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<ALPFDB_SEL_DATA_LIST>-MTSYSID = 1.
<ALPFDB_SEL_DATA_LIST>-MTMCNAME = 1.
<ALPFDB_SEL_DATA_LIST>-MTNUMRANGE = 1.
<ALPFDB_SEL_DATA_LIST>-MTUID = 1.
<ALPFDB_SEL_DATA_LIST>-MTCLASS = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_ALPFDB_SEL_DATA_LIST-OBJNAME, sy-vline,
  WA_ALPFDB_SEL_DATA_LIST-ATTRNAME, sy-vline,
  WA_ALPFDB_SEL_DATA_LIST-MTECLASS, sy-vline,
  WA_ALPFDB_SEL_DATA_LIST-VALUNIT, sy-vline,
  WA_ALPFDB_SEL_DATA_LIST-DECIMALS, sy-vline,
  WA_ALPFDB_SEL_DATA_LIST-FIRSTDAY, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_ALPFDB_SEL_DATA_LIST 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_ALPFDB_SEL_DATA_LIST 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_ALPFDB_SEL_DATA_LIST INTO WA_ALPFDB_SEL_DATA_LIST.


*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.
ENDFORM. 

*&---------------------------------------------------------------------*
*& Form process_as_string_field_values
*&---------------------------------------------------------------------*
FORM process_as_string_field_values CHANGING p_EKKO LIKE wa_EKKO.

TYPES: BEGIN OF T_ALPFDB_SEL_DATA_LIST_STR, 
MTSYSID TYPE STRING,
MTMCNAME TYPE STRING,
MTNUMRANGE TYPE STRING,
MTUID TYPE STRING,
MTCLASS TYPE STRING,
OBJNAME TYPE STRING,
ATTRNAME TYPE STRING,
MTECLASS TYPE STRING,
VALUNIT TYPE STRING,
DECIMALS TYPE STRING,
FIRSTDAY TYPE STRING,
LASTDAY TYPE STRING,
RECTYPE TYPE STRING,
OUT_TIMEZONE TYPE STRING,
SFTNAME TYPE STRING,
CALNAME TYPE STRING,
X_DAY_X TYPE STRING,
VALUE_TYPE TYPE STRING,
DIMENSION TYPE STRING,
READ_METHOD TYPE STRING,END OF T_EKKO_STR.
DATA: WA_ALPFDB_SEL_DATA_LIST_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_ALPFDB_SEL_DATA_LIST_STR-MTSYSID sy-vline 
WA_ALPFDB_SEL_DATA_LIST_STR-MTMCNAME sy-vline 
WA_ALPFDB_SEL_DATA_LIST_STR-MTNUMRANGE sy-vline 
WA_ALPFDB_SEL_DATA_LIST_STR-MTUID sy-vline 
WA_ALPFDB_SEL_DATA_LIST_STR-MTCLASS sy-vline 
WA_ALPFDB_SEL_DATA_LIST_STR-OBJNAME sy-vline 
WA_ALPFDB_SEL_DATA_LIST_STR-ATTRNAME sy-vline 
WA_ALPFDB_SEL_DATA_LIST_STR-MTECLASS sy-vline 
WA_ALPFDB_SEL_DATA_LIST_STR-VALUNIT sy-vline 
WA_ALPFDB_SEL_DATA_LIST_STR-DECIMALS sy-vline 
WA_ALPFDB_SEL_DATA_LIST_STR-FIRSTDAY sy-vline 
WA_ALPFDB_SEL_DATA_LIST_STR-LASTDAY sy-vline 
WA_ALPFDB_SEL_DATA_LIST_STR-RECTYPE sy-vline 
WA_ALPFDB_SEL_DATA_LIST_STR-OUT_TIMEZONE sy-vline 
WA_ALPFDB_SEL_DATA_LIST_STR-SFTNAME sy-vline 
WA_ALPFDB_SEL_DATA_LIST_STR-CALNAME sy-vline 
WA_ALPFDB_SEL_DATA_LIST_STR-X_DAY_X sy-vline 
WA_ALPFDB_SEL_DATA_LIST_STR-VALUE_TYPE sy-vline 
WA_ALPFDB_SEL_DATA_LIST_STR-DIMENSION sy-vline 
WA_ALPFDB_SEL_DATA_LIST_STR-READ_METHOD sy-vline      INTO ld_text SEPARATED BY SPACE.

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