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

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM /SAPAPO/HOWTOCHK
*  INTO TABLE @DATA(IT_/SAPAPO/HOWTOCHK2).
*--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/HOWTOCHK INDEX 1 INTO DATA(WA_/SAPAPO/HOWTOCHK2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
</SAPAPO/HOWTOCHK>-CHMOD = 1.
</SAPAPO/HOWTOCHK>-PRREG = 1.
</SAPAPO/HOWTOCHK>-ATPIDX = 1.
</SAPAPO/HOWTOCHK>-ATPRN = 1.
</SAPAPO/HOWTOCHK>-ALLIDX = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_/SAPAPO/HOWTOCHK-ALLRN, sy-vline,
  WA_/SAPAPO/HOWTOCHK-PLNIDX, sy-vline,
  WA_/SAPAPO/HOWTOCHK-PLNRN, sy-vline,
  WA_/SAPAPO/HOWTOCHK-CBMIDX, sy-vline,
  WA_/SAPAPO/HOWTOCHK-CBMRN, sy-vline,
  WA_/SAPAPO/HOWTOCHK-RULAC, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_/SAPAPO/HOWTOCHK 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/HOWTOCHK 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/HOWTOCHK INTO WA_/SAPAPO/HOWTOCHK.


*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_/SAPAPO/HOWTOCHK_STR, 
CHMOD TYPE STRING,
PRREG TYPE STRING,
ATPIDX TYPE STRING,
ATPRN TYPE STRING,
ALLIDX TYPE STRING,
ALLRN TYPE STRING,
PLNIDX TYPE STRING,
PLNRN TYPE STRING,
CBMIDX TYPE STRING,
CBMRN TYPE STRING,
RULAC TYPE STRING,
RULSC TYPE STRING,
ATPALERT TYPE STRING,
BOMEX TYPE STRING,
BOMLVL TYPE STRING,
REMREQ TYPE STRING,
CMP_PRREG TYPE STRING,
RCRRCP TYPE STRING,
DMALL TYPE STRING,
PRODTYP TYPE STRING,
PPMID TYPE STRING,
TTYPE_3OP TYPE STRING,
TTYPE_TRF TYPE STRING,
CMP_REMREQ TYPE STRING,
CMP_CONVMOD TYPE STRING,
RBA_SUBITMCREA TYPE STRING,
RBA_CPROCEVAL TYPE STRING,
RBA_INCMDON TYPE STRING,
RBA_VALIDITY_MOD TYPE STRING,
RBA_SEGMENT_COPY TYPE STRING,
SOS_EXECUTE TYPE STRING,
SOS_EXECUTE_METH TYPE STRING,
RNDPROC TYPE STRING,
RNDPROCFLAG TYPE STRING,
PRESELECT TYPE STRING,
PACTYPE TYPE STRING,
ROC_ACTIVE TYPE STRING,END OF T_EKKO_STR.
DATA: WA_/SAPAPO/HOWTOCHK_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/HOWTOCHK_STR-CHMOD sy-vline 
WA_/SAPAPO/HOWTOCHK_STR-PRREG sy-vline 
WA_/SAPAPO/HOWTOCHK_STR-ATPIDX sy-vline 
WA_/SAPAPO/HOWTOCHK_STR-ATPRN sy-vline 
WA_/SAPAPO/HOWTOCHK_STR-ALLIDX sy-vline 
WA_/SAPAPO/HOWTOCHK_STR-ALLRN sy-vline 
WA_/SAPAPO/HOWTOCHK_STR-PLNIDX sy-vline 
WA_/SAPAPO/HOWTOCHK_STR-PLNRN sy-vline 
WA_/SAPAPO/HOWTOCHK_STR-CBMIDX sy-vline 
WA_/SAPAPO/HOWTOCHK_STR-CBMRN sy-vline 
WA_/SAPAPO/HOWTOCHK_STR-RULAC sy-vline 
WA_/SAPAPO/HOWTOCHK_STR-RULSC sy-vline 
WA_/SAPAPO/HOWTOCHK_STR-ATPALERT sy-vline 
WA_/SAPAPO/HOWTOCHK_STR-BOMEX sy-vline 
WA_/SAPAPO/HOWTOCHK_STR-BOMLVL sy-vline 
WA_/SAPAPO/HOWTOCHK_STR-REMREQ sy-vline 
WA_/SAPAPO/HOWTOCHK_STR-CMP_PRREG sy-vline 
WA_/SAPAPO/HOWTOCHK_STR-RCRRCP sy-vline 
WA_/SAPAPO/HOWTOCHK_STR-DMALL sy-vline 
WA_/SAPAPO/HOWTOCHK_STR-PRODTYP sy-vline 
WA_/SAPAPO/HOWTOCHK_STR-PPMID sy-vline 
WA_/SAPAPO/HOWTOCHK_STR-TTYPE_3OP sy-vline 
WA_/SAPAPO/HOWTOCHK_STR-TTYPE_TRF sy-vline 
WA_/SAPAPO/HOWTOCHK_STR-CMP_REMREQ sy-vline 
WA_/SAPAPO/HOWTOCHK_STR-CMP_CONVMOD sy-vline 
WA_/SAPAPO/HOWTOCHK_STR-RBA_SUBITMCREA sy-vline 
WA_/SAPAPO/HOWTOCHK_STR-RBA_CPROCEVAL sy-vline 
WA_/SAPAPO/HOWTOCHK_STR-RBA_INCMDON sy-vline 
WA_/SAPAPO/HOWTOCHK_STR-RBA_VALIDITY_MOD sy-vline 
WA_/SAPAPO/HOWTOCHK_STR-RBA_SEGMENT_COPY sy-vline 
WA_/SAPAPO/HOWTOCHK_STR-SOS_EXECUTE sy-vline 
WA_/SAPAPO/HOWTOCHK_STR-SOS_EXECUTE_METH sy-vline 
WA_/SAPAPO/HOWTOCHK_STR-RNDPROC sy-vline 
WA_/SAPAPO/HOWTOCHK_STR-RNDPROCFLAG sy-vline 
WA_/SAPAPO/HOWTOCHK_STR-PRESELECT sy-vline 
WA_/SAPAPO/HOWTOCHK_STR-PACTYPE sy-vline 
WA_/SAPAPO/HOWTOCHK_STR-ROC_ACTIVE sy-vline      INTO ld_text SEPARATED BY SPACE.

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