ABAP Select data from SAP table PIQSTDEREG into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM PIQSTDEREG
*  INTO TABLE @DATA(IT_PIQSTDEREG2).
*--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_PIQSTDEREG INDEX 1 INTO DATA(WA_PIQSTDEREG2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<PIQSTDEREG>-ST_OBJID = 1.
<PIQSTDEREG>-CS_OBJID = 1.
<PIQSTDEREG>-SC_OBJID = 1.
<PIQSTDEREG>-ENDDA = 1.
<PIQSTDEREG>-DERAPPTYPE = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_PIQSTDEREG-DERREASON, sy-vline,
  WA_PIQSTDEREG-DERDATE, sy-vline,
  WA_PIQSTDEREG-LAST_ATTEND, sy-vline,
  WA_PIQSTDEREG-STUDENT12, sy-vline,
  WA_PIQSTDEREG-ST_STEXT, sy-vline,
  WA_PIQSTDEREG-SC_SHORT, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_PIQSTDEREG 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_PIQSTDEREG 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_PIQSTDEREG INTO WA_PIQSTDEREG.


*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 PIQST, internal->external for field STUDENT12
CALL FUNCTION 'CONVERSION_EXIT_PIQST_OUTPUT'
  EXPORTING
    input =                      WA_PIQSTDEREG-STUDENT12
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_PIQSTDEREG-STUDENT12.
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_PIQSTDEREG_STR, 
ST_OBJID TYPE STRING,
CS_OBJID TYPE STRING,
SC_OBJID TYPE STRING,
ENDDA TYPE STRING,
DERAPPTYPE TYPE STRING,
DERREASON TYPE STRING,
DERDATE TYPE STRING,
LAST_ATTEND TYPE STRING,
STUDENT12 TYPE STRING,
ST_STEXT TYPE STRING,
SC_SHORT TYPE STRING,
SC_STEXT TYPE STRING,
O_SHORT TYPE STRING,
O_STEXT TYPE STRING,
REASONT TYPE STRING,
END_PROCESST TYPE STRING,
ALUMNUSRELAT TYPE STRING,
CANCELMODULES TYPE STRING,
CANCELSEGM TYPE STRING,END OF T_EKKO_STR.
DATA: WA_PIQSTDEREG_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_PIQSTDEREG_STR-ST_OBJID sy-vline 
WA_PIQSTDEREG_STR-CS_OBJID sy-vline 
WA_PIQSTDEREG_STR-SC_OBJID sy-vline 
WA_PIQSTDEREG_STR-ENDDA sy-vline 
WA_PIQSTDEREG_STR-DERAPPTYPE sy-vline 
WA_PIQSTDEREG_STR-DERREASON sy-vline 
WA_PIQSTDEREG_STR-DERDATE sy-vline 
WA_PIQSTDEREG_STR-LAST_ATTEND sy-vline 
WA_PIQSTDEREG_STR-STUDENT12 sy-vline 
WA_PIQSTDEREG_STR-ST_STEXT sy-vline 
WA_PIQSTDEREG_STR-SC_SHORT sy-vline 
WA_PIQSTDEREG_STR-SC_STEXT sy-vline 
WA_PIQSTDEREG_STR-O_SHORT sy-vline 
WA_PIQSTDEREG_STR-O_STEXT sy-vline 
WA_PIQSTDEREG_STR-REASONT sy-vline 
WA_PIQSTDEREG_STR-END_PROCESST sy-vline 
WA_PIQSTDEREG_STR-ALUMNUSRELAT sy-vline 
WA_PIQSTDEREG_STR-CANCELMODULES sy-vline 
WA_PIQSTDEREG_STR-CANCELSEGM sy-vline      INTO ld_text SEPARATED BY SPACE.

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