ABAP Select data from SAP table CPEV_CALCRULE into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM CPEV_CALCRULE
*  INTO TABLE @DATA(IT_CPEV_CALCRULE2).
*--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_CPEV_CALCRULE INDEX 1 INTO DATA(WA_CPEV_CALCRULE2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<CPEV_CALCRULE>-CLIENT = 1.
<CPEV_CALCRULE>-LOGSYS = 1.
<CPEV_CALCRULE>-CALCRULE = 1.
<CPEV_CALCRULE>-VALIDTO = 1.
<CPEV_CALCRULE>-RULETEXT = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_CPEV_CALCRULE-CALCROUT, sy-vline,
  WA_CPEV_CALCRULE-CALCMIN, sy-vline,
  WA_CPEV_CALCRULE-CALCMAX, sy-vline,
  WA_CPEV_CALCRULE-CALCMMCURR, sy-vline,
  WA_CPEV_CALCRULE-CALCMMPRUN, sy-vline,
  WA_CPEV_CALCRULE-CALCMMUOM, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_CPEV_CALCRULE 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_CPEV_CALCRULE 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_CPEV_CALCRULE INTO WA_CPEV_CALCRULE.


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

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

*Conversion exit TSTPS, internal->external for field VALIDTO
CALL FUNCTION 'CONVERSION_EXIT_TSTPS_OUTPUT'
  EXPORTING
    input =                      WA_CPEV_CALCRULE-VALIDTO
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_CPEV_CALCRULE-VALIDTO.
WRITE:/ 'New Value:', ld_input.

*Conversion exit CUNIT, internal->external for field CALCMMUOM
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_CPEV_CALCRULE-CALCMMUOM
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_CPEV_CALCRULE-CALCMMUOM.
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_CPEV_CALCRULE_STR, 
CLIENT TYPE STRING,
LOGSYS TYPE STRING,
CALCRULE TYPE STRING,
VALIDTO TYPE STRING,
RULETEXT TYPE STRING,
CALCROUT TYPE STRING,
CALCMIN TYPE STRING,
CALCMAX TYPE STRING,
CALCMMCURR TYPE STRING,
CALCMMPRUN TYPE STRING,
CALCMMUOM TYPE STRING,END OF T_EKKO_STR.
DATA: WA_CPEV_CALCRULE_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_CPEV_CALCRULE_STR-CLIENT sy-vline 
WA_CPEV_CALCRULE_STR-LOGSYS sy-vline 
WA_CPEV_CALCRULE_STR-CALCRULE sy-vline 
WA_CPEV_CALCRULE_STR-VALIDTO sy-vline 
WA_CPEV_CALCRULE_STR-RULETEXT sy-vline 
WA_CPEV_CALCRULE_STR-CALCROUT sy-vline 
WA_CPEV_CALCRULE_STR-CALCMIN sy-vline 
WA_CPEV_CALCRULE_STR-CALCMAX sy-vline 
WA_CPEV_CALCRULE_STR-CALCMMCURR sy-vline 
WA_CPEV_CALCRULE_STR-CALCMMPRUN sy-vline 
WA_CPEV_CALCRULE_STR-CALCMMUOM sy-vline      INTO ld_text SEPARATED BY SPACE.

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