ABAP Select data from SAP table CPEC_PERIODDET into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM CPEC_PERIODDET
*  INTO TABLE @DATA(IT_CPEC_PERIODDET2).
*--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_CPEC_PERIODDET INDEX 1 INTO DATA(WA_CPEC_PERIODDET2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<CPEC_PERIODDET>-CLIENT = 1.
<CPEC_PERIODDET>-LOGSYS = 1.
<CPEC_PERIODDET>-PERIODDETRULE = 1.
<CPEC_PERIODDET>-VALIDTO = 1.
<CPEC_PERIODDET>-PERIODDETROUT = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_CPEC_PERIODDET-SOURCEROUT, sy-vline,
  WA_CPEC_PERIODDET-REFDATEROUT, sy-vline,
  WA_CPEC_PERIODDET-DATEOFFSETROUT, sy-vline,
  WA_CPEC_PERIODDET-OFFSETUNITS, sy-vline,
  WA_CPEC_PERIODDET-TIMEUOMROUT, sy-vline,
  WA_CPEC_PERIODDET-TIMEUNITSBEF, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_CPEC_PERIODDET 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_CPEC_PERIODDET 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_CPEC_PERIODDET INTO WA_CPEC_PERIODDET.


*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_CPEC_PERIODDET-LOGSYS
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_CPEC_PERIODDET-LOGSYS.
WRITE:/ 'New Value:', ld_input.

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

*Conversion exit TSTPS, internal->external for field VALIDTO
CALL FUNCTION 'CONVERSION_EXIT_TSTPS_OUTPUT'
  EXPORTING
    input =                      WA_CPEC_PERIODDET-VALIDTO
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_CPEC_PERIODDET-VALIDTO.
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_CPEC_PERIODDET_STR, 
CLIENT TYPE STRING,
LOGSYS TYPE STRING,
PERIODDETRULE TYPE STRING,
VALIDTO TYPE STRING,
PERIODDETROUT TYPE STRING,
SOURCEROUT TYPE STRING,
REFDATEROUT TYPE STRING,
DATEOFFSETROUT TYPE STRING,
OFFSETUNITS TYPE STRING,
TIMEUOMROUT TYPE STRING,
TIMEUNITSBEF TYPE STRING,
TIMEUNITSAFT TYPE STRING,
EXCL_BASEDATE TYPE STRING,
DATEFROM TYPE STRING,
TIMEFROM TYPE STRING,
DATETO TYPE STRING,
TIMETO TYPE STRING,
DATELISTROUT TYPE STRING,
PERDETCALID TYPE STRING,
MISSENTRYROUT TYPE STRING,
CLOSEDDAYSROUT TYPE STRING,
MAXWEIGHTING TYPE STRING,END OF T_EKKO_STR.
DATA: WA_CPEC_PERIODDET_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_CPEC_PERIODDET_STR-CLIENT sy-vline 
WA_CPEC_PERIODDET_STR-LOGSYS sy-vline 
WA_CPEC_PERIODDET_STR-PERIODDETRULE sy-vline 
WA_CPEC_PERIODDET_STR-VALIDTO sy-vline 
WA_CPEC_PERIODDET_STR-PERIODDETROUT sy-vline 
WA_CPEC_PERIODDET_STR-SOURCEROUT sy-vline 
WA_CPEC_PERIODDET_STR-REFDATEROUT sy-vline 
WA_CPEC_PERIODDET_STR-DATEOFFSETROUT sy-vline 
WA_CPEC_PERIODDET_STR-OFFSETUNITS sy-vline 
WA_CPEC_PERIODDET_STR-TIMEUOMROUT sy-vline 
WA_CPEC_PERIODDET_STR-TIMEUNITSBEF sy-vline 
WA_CPEC_PERIODDET_STR-TIMEUNITSAFT sy-vline 
WA_CPEC_PERIODDET_STR-EXCL_BASEDATE sy-vline 
WA_CPEC_PERIODDET_STR-DATEFROM sy-vline 
WA_CPEC_PERIODDET_STR-TIMEFROM sy-vline 
WA_CPEC_PERIODDET_STR-DATETO sy-vline 
WA_CPEC_PERIODDET_STR-TIMETO sy-vline 
WA_CPEC_PERIODDET_STR-DATELISTROUT sy-vline 
WA_CPEC_PERIODDET_STR-PERDETCALID sy-vline 
WA_CPEC_PERIODDET_STR-MISSENTRYROUT sy-vline 
WA_CPEC_PERIODDET_STR-CLOSEDDAYSROUT sy-vline 
WA_CPEC_PERIODDET_STR-MAXWEIGHTING sy-vline      INTO ld_text SEPARATED BY SPACE.

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