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

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM /SAPAPO/RPT_PER_GEN
*  INTO TABLE @DATA(IT_/SAPAPO/RPT_PER_GEN2).
*--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/RPT_PER_GEN INDEX 1 INTO DATA(WA_/SAPAPO/RPT_PER_GEN2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
</SAPAPO/RPT_PER_GEN>-ROWEXT = 1.
</SAPAPO/RPT_PER_GEN>-QUATYP = 1.
</SAPAPO/RPT_PER_GEN>-TEXT1 = 1.
</SAPAPO/RPT_PER_GEN>-MEINS = 1.
</SAPAPO/RPT_PER_GEN>-RTOTAL01 = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_/SAPAPO/RPT_PER_GEN-RTOTAL02, sy-vline,
  WA_/SAPAPO/RPT_PER_GEN-RTOTAL03, sy-vline,
  WA_/SAPAPO/RPT_PER_GEN-RTOTAL04, sy-vline,
  WA_/SAPAPO/RPT_PER_GEN-RTOTAL05, sy-vline,
  WA_/SAPAPO/RPT_PER_GEN-RTOTAL06, sy-vline,
  WA_/SAPAPO/RPT_PER_GEN-RTOTAL07, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_/SAPAPO/RPT_PER_GEN 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/RPT_PER_GEN 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/RPT_PER_GEN INTO WA_/SAPAPO/RPT_PER_GEN.


*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 MEINS
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_/SAPAPO/RPT_PER_GEN-MEINS
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_/SAPAPO/RPT_PER_GEN-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_/SAPAPO/RPT_PER_GEN_STR, 
ROWEXT TYPE STRING,
QUATYP TYPE STRING,
TEXT1 TYPE STRING,
MEINS TYPE STRING,
RTOTAL01 TYPE STRING,
RTOTAL02 TYPE STRING,
RTOTAL03 TYPE STRING,
RTOTAL04 TYPE STRING,
RTOTAL05 TYPE STRING,
RTOTAL06 TYPE STRING,
RTOTAL07 TYPE STRING,
RTOTAL08 TYPE STRING,
RTOTAL09 TYPE STRING,
COLORS TYPE STRING,
DDTAB TYPE STRING,
STYLE TYPE STRING,
LINECOLOR TYPE STRING,END OF T_EKKO_STR.
DATA: WA_/SAPAPO/RPT_PER_GEN_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/RPT_PER_GEN_STR-ROWEXT sy-vline 
WA_/SAPAPO/RPT_PER_GEN_STR-QUATYP sy-vline 
WA_/SAPAPO/RPT_PER_GEN_STR-TEXT1 sy-vline 
WA_/SAPAPO/RPT_PER_GEN_STR-MEINS sy-vline 
WA_/SAPAPO/RPT_PER_GEN_STR-RTOTAL01 sy-vline 
WA_/SAPAPO/RPT_PER_GEN_STR-RTOTAL02 sy-vline 
WA_/SAPAPO/RPT_PER_GEN_STR-RTOTAL03 sy-vline 
WA_/SAPAPO/RPT_PER_GEN_STR-RTOTAL04 sy-vline 
WA_/SAPAPO/RPT_PER_GEN_STR-RTOTAL05 sy-vline 
WA_/SAPAPO/RPT_PER_GEN_STR-RTOTAL06 sy-vline 
WA_/SAPAPO/RPT_PER_GEN_STR-RTOTAL07 sy-vline 
WA_/SAPAPO/RPT_PER_GEN_STR-RTOTAL08 sy-vline 
WA_/SAPAPO/RPT_PER_GEN_STR-RTOTAL09 sy-vline 
WA_/SAPAPO/RPT_PER_GEN_STR-COLORS sy-vline 
WA_/SAPAPO/RPT_PER_GEN_STR-DDTAB sy-vline 
WA_/SAPAPO/RPT_PER_GEN_STR-STYLE sy-vline 
WA_/SAPAPO/RPT_PER_GEN_STR-LINECOLOR sy-vline      INTO ld_text SEPARATED BY SPACE.

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