ABAP Select data from SAP table PIQROOM_OCCUPIERS into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM PIQROOM_OCCUPIERS
*  INTO TABLE @DATA(IT_PIQROOM_OCCUPIERS2).
*--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_PIQROOM_OCCUPIERS INDEX 1 INTO DATA(WA_PIQROOM_OCCUPIERS2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<PIQROOM_OCCUPIERS>-EVDAT = 1.
<PIQROOM_OCCUPIERS>-DAY_NR = 1.
<PIQROOM_OCCUPIERS>-DAY_NAME = 1.
<PIQROOM_OCCUPIERS>-BEGUZ = 1.
<PIQROOM_OCCUPIERS>-ENDUZ = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_PIQROOM_OCCUPIERS-E_OBJID, sy-vline,
  WA_PIQROOM_OCCUPIERS-E_OTYPE, sy-vline,
  WA_PIQROOM_OCCUPIERS-E_SHORT, sy-vline,
  WA_PIQROOM_OCCUPIERS-E_STEXT, sy-vline,
  WA_PIQROOM_OCCUPIERS-E_CAP_MIN, sy-vline,
  WA_PIQROOM_OCCUPIERS-E_CAP_OPT, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_PIQROOM_OCCUPIERS 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_PIQROOM_OCCUPIERS 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_PIQROOM_OCCUPIERS INTO WA_PIQROOM_OCCUPIERS.


*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_PIQROOM_OCCUPIERS_STR, 
EVDAT TYPE STRING,
DAY_NR TYPE STRING,
DAY_NAME TYPE STRING,
BEGUZ TYPE STRING,
ENDUZ TYPE STRING,
E_OBJID TYPE STRING,
E_OTYPE TYPE STRING,
E_SHORT TYPE STRING,
E_STEXT TYPE STRING,
E_CAP_MIN TYPE STRING,
E_CAP_OPT TYPE STRING,
E_CAP_MAX TYPE STRING,
EVPROCSTAT TYPE STRING,
EVPROCSTATTXT TYPE STRING,
AVAIL_PLACES TYPE STRING,
TOTAL_BOOKINGS TYPE STRING,
NORMAL_BOOKINGS TYPE STRING,
WAITLIST TYPE STRING,
D_OBJID TYPE STRING,
D_SHORT TYPE STRING,
D_STEXT TYPE STRING,
D_CATEGORY TYPE STRING,
D_CATEGORYTXT TYPE STRING,
SM_OBJID TYPE STRING,
SM_SHORT TYPE STRING,
SM_STEXT TYPE STRING,
SE_OBJID TYPE STRING,
SE_SHORT TYPE STRING,
SE_STEXT TYPE STRING,
SM_CATEGORY TYPE STRING,
ACADEMIC_EVENT TYPE STRING,
CONTACT TYPE STRING,
ROOM_ID TYPE STRING,END OF T_EKKO_STR.
DATA: WA_PIQROOM_OCCUPIERS_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_PIQROOM_OCCUPIERS_STR-EVDAT sy-vline 
WA_PIQROOM_OCCUPIERS_STR-DAY_NR sy-vline 
WA_PIQROOM_OCCUPIERS_STR-DAY_NAME sy-vline 
WA_PIQROOM_OCCUPIERS_STR-BEGUZ sy-vline 
WA_PIQROOM_OCCUPIERS_STR-ENDUZ sy-vline 
WA_PIQROOM_OCCUPIERS_STR-E_OBJID sy-vline 
WA_PIQROOM_OCCUPIERS_STR-E_OTYPE sy-vline 
WA_PIQROOM_OCCUPIERS_STR-E_SHORT sy-vline 
WA_PIQROOM_OCCUPIERS_STR-E_STEXT sy-vline 
WA_PIQROOM_OCCUPIERS_STR-E_CAP_MIN sy-vline 
WA_PIQROOM_OCCUPIERS_STR-E_CAP_OPT sy-vline 
WA_PIQROOM_OCCUPIERS_STR-E_CAP_MAX sy-vline 
WA_PIQROOM_OCCUPIERS_STR-EVPROCSTAT sy-vline 
WA_PIQROOM_OCCUPIERS_STR-EVPROCSTATTXT sy-vline 
WA_PIQROOM_OCCUPIERS_STR-AVAIL_PLACES sy-vline 
WA_PIQROOM_OCCUPIERS_STR-TOTAL_BOOKINGS sy-vline 
WA_PIQROOM_OCCUPIERS_STR-NORMAL_BOOKINGS sy-vline 
WA_PIQROOM_OCCUPIERS_STR-WAITLIST sy-vline 
WA_PIQROOM_OCCUPIERS_STR-D_OBJID sy-vline 
WA_PIQROOM_OCCUPIERS_STR-D_SHORT sy-vline 
WA_PIQROOM_OCCUPIERS_STR-D_STEXT sy-vline 
WA_PIQROOM_OCCUPIERS_STR-D_CATEGORY sy-vline 
WA_PIQROOM_OCCUPIERS_STR-D_CATEGORYTXT sy-vline 
WA_PIQROOM_OCCUPIERS_STR-SM_OBJID sy-vline 
WA_PIQROOM_OCCUPIERS_STR-SM_SHORT sy-vline 
WA_PIQROOM_OCCUPIERS_STR-SM_STEXT sy-vline 
WA_PIQROOM_OCCUPIERS_STR-SE_OBJID sy-vline 
WA_PIQROOM_OCCUPIERS_STR-SE_SHORT sy-vline 
WA_PIQROOM_OCCUPIERS_STR-SE_STEXT sy-vline 
WA_PIQROOM_OCCUPIERS_STR-SM_CATEGORY sy-vline 
WA_PIQROOM_OCCUPIERS_STR-ACADEMIC_EVENT sy-vline 
WA_PIQROOM_OCCUPIERS_STR-CONTACT sy-vline 
WA_PIQROOM_OCCUPIERS_STR-ROOM_ID sy-vline      INTO ld_text SEPARATED BY SPACE.

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