ABAP Select data from SAP table PIQ_F4STUDENT_SEL into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP PIQ_F4STUDENT_SEL 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 PIQ_F4STUDENT_SEL. 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 PIQ_F4STUDENT_SEL 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_PIQ_F4STUDENT_SEL TYPE STANDARD TABLE OF PIQ_F4STUDENT_SEL,
      WA_PIQ_F4STUDENT_SEL TYPE PIQ_F4STUDENT_SEL,
      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: <PIQ_F4STUDENT_SEL> TYPE PIQ_F4STUDENT_SEL.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_PIQ_F4STUDENT_SEL.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM PIQ_F4STUDENT_SEL
  INTO TABLE IT_PIQ_F4STUDENT_SEL.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM PIQ_F4STUDENT_SEL
*  INTO TABLE @DATA(IT_PIQ_F4STUDENT_SEL2).
*--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_PIQ_F4STUDENT_SEL INDEX 1 INTO DATA(WA_PIQ_F4STUDENT_SEL2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_PIQ_F4STUDENT_SEL ASSIGNING <PIQ_F4STUDENT_SEL>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<PIQ_F4STUDENT_SEL>-MATNR = 1.
<PIQ_F4STUDENT_SEL>-NACHN = 1.
<PIQ_F4STUDENT_SEL>-VORNA = 1.
<PIQ_F4STUDENT_SEL>-MIDNM = 1.
<PIQ_F4STUDENT_SEL>-BIRTHNAME = 1.

ENDLOOP.

LOOP AT IT_PIQ_F4STUDENT_SEL INTO WA_PIQ_F4STUDENT_SEL.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_PIQ_F4STUDENT_SEL-GBDAT, sy-vline,
  WA_PIQ_F4STUDENT_SEL-GBLND, sy-vline,
  WA_PIQ_F4STUDENT_SEL-PRDNI, sy-vline,
  WA_PIQ_F4STUDENT_SEL-KEY_DATE, sy-vline,
  WA_PIQ_F4STUDENT_SEL-MATRIKEL, sy-vline,
  WA_PIQ_F4STUDENT_SEL-STATUS, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_PIQ_F4STUDENT_SEL 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_PIQ_F4STUDENT_SEL 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_PIQ_F4STUDENT_SEL INTO WA_PIQ_F4STUDENT_SEL.


*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 MATNR
CALL FUNCTION 'CONVERSION_EXIT_PIQST_OUTPUT'
  EXPORTING
    input =                      WA_PIQ_F4STUDENT_SEL-MATNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_PIQ_F4STUDENT_SEL-MATNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit PDATE, internal->external for field GBDAT
CALL FUNCTION 'CONVERSION_EXIT_PDATE_OUTPUT'
  EXPORTING
    input =                      WA_PIQ_F4STUDENT_SEL-GBDAT
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_PIQ_F4STUDENT_SEL-GBDAT.
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_PIQ_F4STUDENT_SEL_STR, 
MATNR TYPE STRING,
NACHN TYPE STRING,
VORNA TYPE STRING,
MIDNM TYPE STRING,
BIRTHNAME TYPE STRING,
GBDAT TYPE STRING,
GBLND TYPE STRING,
PRDNI TYPE STRING,
KEY_DATE TYPE STRING,
MATRIKEL TYPE STRING,
STATUS TYPE STRING,
BEGDA TYPE STRING,
ENDDA TYPE STRING,
AYEAR TYPE STRING,
PERID TYPE STRING,
MAXRECORDS TYPE STRING,
LANDX TYPE STRING,
RESTRICT TYPE STRING,
STATUST TYPE STRING,
INCLUDE_ARCHIVE TYPE STRING,END OF T_EKKO_STR.
DATA: WA_PIQ_F4STUDENT_SEL_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_PIQ_F4STUDENT_SEL_STR-MATNR sy-vline 
WA_PIQ_F4STUDENT_SEL_STR-NACHN sy-vline 
WA_PIQ_F4STUDENT_SEL_STR-VORNA sy-vline 
WA_PIQ_F4STUDENT_SEL_STR-MIDNM sy-vline 
WA_PIQ_F4STUDENT_SEL_STR-BIRTHNAME sy-vline 
WA_PIQ_F4STUDENT_SEL_STR-GBDAT sy-vline 
WA_PIQ_F4STUDENT_SEL_STR-GBLND sy-vline 
WA_PIQ_F4STUDENT_SEL_STR-PRDNI sy-vline 
WA_PIQ_F4STUDENT_SEL_STR-KEY_DATE sy-vline 
WA_PIQ_F4STUDENT_SEL_STR-MATRIKEL sy-vline 
WA_PIQ_F4STUDENT_SEL_STR-STATUS sy-vline 
WA_PIQ_F4STUDENT_SEL_STR-BEGDA sy-vline 
WA_PIQ_F4STUDENT_SEL_STR-ENDDA sy-vline 
WA_PIQ_F4STUDENT_SEL_STR-AYEAR sy-vline 
WA_PIQ_F4STUDENT_SEL_STR-PERID sy-vline 
WA_PIQ_F4STUDENT_SEL_STR-MAXRECORDS sy-vline 
WA_PIQ_F4STUDENT_SEL_STR-LANDX sy-vline 
WA_PIQ_F4STUDENT_SEL_STR-RESTRICT sy-vline 
WA_PIQ_F4STUDENT_SEL_STR-STATUST sy-vline 
WA_PIQ_F4STUDENT_SEL_STR-INCLUDE_ARCHIVE sy-vline      INTO ld_text SEPARATED BY SPACE.

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