ABAP Select data from SAP table /SAPAPO/COMPALT_N into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP /SAPAPO/COMPALT_N 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 /SAPAPO/COMPALT_N. 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 /SAPAPO/COMPALT_N 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_/SAPAPO/COMPALT_N TYPE STANDARD TABLE OF /SAPAPO/COMPALT_N,
      WA_/SAPAPO/COMPALT_N TYPE /SAPAPO/COMPALT_N,
      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: </SAPAPO/COMPALT_N> TYPE /SAPAPO/COMPALT_N.

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

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM /SAPAPO/COMPALT_N
  INTO TABLE IT_/SAPAPO/COMPALT_N.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM /SAPAPO/COMPALT_N
*  INTO TABLE @DATA(IT_/SAPAPO/COMPALT_N2).
*--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_/SAPAPO/COMPALT_N INDEX 1 INTO DATA(WA_/SAPAPO/COMPALT_N2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_/SAPAPO/COMPALT_N ASSIGNING </SAPAPO/COMPALT_N>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
</SAPAPO/COMPALT_N>-MANDT = 1.
</SAPAPO/COMPALT_N>-AMATID = 1.
</SAPAPO/COMPALT_N>-MATID = 1.
</SAPAPO/COMPALT_N>-DATET = 1.
</SAPAPO/COMPALT_N>-ACTID = 1.

ENDLOOP.

LOOP AT IT_/SAPAPO/COMPALT_N INTO WA_/SAPAPO/COMPALT_N.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_/SAPAPO/COMPALT_N-DATEF, sy-vline,
  WA_/SAPAPO/COMPALT_N-PAR1, sy-vline,
  WA_/SAPAPO/COMPALT_N-PAR2, sy-vline,
  WA_/SAPAPO/COMPALT_N-PENAL, sy-vline,
  WA_/SAPAPO/COMPALT_N-ALPST, sy-vline,
  WA_/SAPAPO/COMPALT_N-ALPRF, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_/SAPAPO/COMPALT_N 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_/SAPAPO/COMPALT_N 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_/SAPAPO/COMPALT_N INTO WA_/SAPAPO/COMPALT_N.


*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 CUNIT, internal->external for field UNIT
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_/SAPAPO/COMPALT_N-UNIT
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_/SAPAPO/COMPALT_N-UNIT.
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_/SAPAPO/COMPALT_N_STR, 
MANDT TYPE STRING,
AMATID TYPE STRING,
MATID TYPE STRING,
DATET TYPE STRING,
ACTID TYPE STRING,
DATEF TYPE STRING,
PAR1 TYPE STRING,
PAR2 TYPE STRING,
PENAL TYPE STRING,
ALPST TYPE STRING,
ALPRF TYPE STRING,
UPROB TYPE STRING,
SUBLOC TYPE STRING,
TIPP TYPE STRING,
AEXPL TYPE STRING,
UNIT TYPE STRING,
BOMID TYPE STRING,
MET_LRCH TYPE STRING,
MAX_FERTL TYPE STRING,
FIX_AS_J TYPE STRING,
FIX_AS_E TYPE STRING,
FIX_AS_L TYPE STRING,
ABL_ZAHL TYPE STRING,
RUNDFAKT TYPE STRING,
UTC_KONV TYPE STRING,
AMATID_N TYPE STRING,END OF T_EKKO_STR.
DATA: WA_/SAPAPO/COMPALT_N_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_/SAPAPO/COMPALT_N_STR-MANDT sy-vline 
WA_/SAPAPO/COMPALT_N_STR-AMATID sy-vline 
WA_/SAPAPO/COMPALT_N_STR-MATID sy-vline 
WA_/SAPAPO/COMPALT_N_STR-DATET sy-vline 
WA_/SAPAPO/COMPALT_N_STR-ACTID sy-vline 
WA_/SAPAPO/COMPALT_N_STR-DATEF sy-vline 
WA_/SAPAPO/COMPALT_N_STR-PAR1 sy-vline 
WA_/SAPAPO/COMPALT_N_STR-PAR2 sy-vline 
WA_/SAPAPO/COMPALT_N_STR-PENAL sy-vline 
WA_/SAPAPO/COMPALT_N_STR-ALPST sy-vline 
WA_/SAPAPO/COMPALT_N_STR-ALPRF sy-vline 
WA_/SAPAPO/COMPALT_N_STR-UPROB sy-vline 
WA_/SAPAPO/COMPALT_N_STR-SUBLOC sy-vline 
WA_/SAPAPO/COMPALT_N_STR-TIPP sy-vline 
WA_/SAPAPO/COMPALT_N_STR-AEXPL sy-vline 
WA_/SAPAPO/COMPALT_N_STR-UNIT sy-vline 
WA_/SAPAPO/COMPALT_N_STR-BOMID sy-vline 
WA_/SAPAPO/COMPALT_N_STR-MET_LRCH sy-vline 
WA_/SAPAPO/COMPALT_N_STR-MAX_FERTL sy-vline 
WA_/SAPAPO/COMPALT_N_STR-FIX_AS_J sy-vline 
WA_/SAPAPO/COMPALT_N_STR-FIX_AS_E sy-vline 
WA_/SAPAPO/COMPALT_N_STR-FIX_AS_L sy-vline 
WA_/SAPAPO/COMPALT_N_STR-ABL_ZAHL sy-vline 
WA_/SAPAPO/COMPALT_N_STR-RUNDFAKT sy-vline 
WA_/SAPAPO/COMPALT_N_STR-UTC_KONV sy-vline 
WA_/SAPAPO/COMPALT_N_STR-AMATID_N sy-vline      INTO ld_text SEPARATED BY SPACE.

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