ABAP Select data from SAP table PIQ_STUDENT_LIST into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP PIQ_STUDENT_LIST 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_STUDENT_LIST. 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_STUDENT_LIST 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_STUDENT_LIST TYPE STANDARD TABLE OF PIQ_STUDENT_LIST,
      WA_PIQ_STUDENT_LIST TYPE PIQ_STUDENT_LIST,
      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_STUDENT_LIST> TYPE PIQ_STUDENT_LIST.

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM PIQ_STUDENT_LIST
*  INTO TABLE @DATA(IT_PIQ_STUDENT_LIST2).
*--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_STUDENT_LIST INDEX 1 INTO DATA(WA_PIQ_STUDENT_LIST2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<PIQ_STUDENT_LIST>-STUDENT_NUMBER = 1.
<PIQ_STUDENT_LIST>-STUDENT_OBJID = 1.
<PIQ_STUDENT_LIST>-STUDENT_IDEN_NUM = 1.
<PIQ_STUDENT_LIST>-STUDENT_NAME = 1.
<PIQ_STUDENT_LIST>-PROGRAM_OF_STUDY = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_PIQ_STUDENT_LIST-STATUS, sy-vline,
  WA_PIQ_STUDENT_LIST-STATUS1, sy-vline,
  WA_PIQ_STUDENT_LIST-STATUS1_TXT, sy-vline,
  WA_PIQ_STUDENT_LIST-STATUS2, sy-vline,
  WA_PIQ_STUDENT_LIST-STATUS2_TXT, sy-vline,
  WA_PIQ_STUDENT_LIST-STAGE_NO, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_PIQ_STUDENT_LIST 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_STUDENT_LIST 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_STUDENT_LIST INTO WA_PIQ_STUDENT_LIST.


*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 STUDENT_NUMBER
CALL FUNCTION 'CONVERSION_EXIT_PIQST_OUTPUT'
  EXPORTING
    input =                      WA_PIQ_STUDENT_LIST-STUDENT_NUMBER
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_PIQ_STUDENT_LIST-STUDENT_NUMBER.
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_STUDENT_LIST_STR, 
STUDENT_NUMBER TYPE STRING,
STUDENT_OBJID TYPE STRING,
STUDENT_IDEN_NUM TYPE STRING,
STUDENT_NAME TYPE STRING,
PROGRAM_OF_STUDY TYPE STRING,
STATUS TYPE STRING,
STATUS1 TYPE STRING,
STATUS1_TXT TYPE STRING,
STATUS2 TYPE STRING,
STATUS2_TXT TYPE STRING,
STAGE_NO TYPE STRING,
STAGE_TXT TYPE STRING,
REG_STATUS TYPE STRING,
ACADEMIC_YEAR TYPE STRING,
ACADEMIC_SESS TYPE STRING,
SEARCH_TEXT TYPE STRING,
PROGRAM_OF_STUDY_TEXT TYPE STRING,
RETURN_MESSAGE TYPE STRING,END OF T_EKKO_STR.
DATA: WA_PIQ_STUDENT_LIST_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_STUDENT_LIST_STR-STUDENT_NUMBER sy-vline 
WA_PIQ_STUDENT_LIST_STR-STUDENT_OBJID sy-vline 
WA_PIQ_STUDENT_LIST_STR-STUDENT_IDEN_NUM sy-vline 
WA_PIQ_STUDENT_LIST_STR-STUDENT_NAME sy-vline 
WA_PIQ_STUDENT_LIST_STR-PROGRAM_OF_STUDY sy-vline 
WA_PIQ_STUDENT_LIST_STR-STATUS sy-vline 
WA_PIQ_STUDENT_LIST_STR-STATUS1 sy-vline 
WA_PIQ_STUDENT_LIST_STR-STATUS1_TXT sy-vline 
WA_PIQ_STUDENT_LIST_STR-STATUS2 sy-vline 
WA_PIQ_STUDENT_LIST_STR-STATUS2_TXT sy-vline 
WA_PIQ_STUDENT_LIST_STR-STAGE_NO sy-vline 
WA_PIQ_STUDENT_LIST_STR-STAGE_TXT sy-vline 
WA_PIQ_STUDENT_LIST_STR-REG_STATUS sy-vline 
WA_PIQ_STUDENT_LIST_STR-ACADEMIC_YEAR sy-vline 
WA_PIQ_STUDENT_LIST_STR-ACADEMIC_SESS sy-vline 
WA_PIQ_STUDENT_LIST_STR-SEARCH_TEXT sy-vline 
WA_PIQ_STUDENT_LIST_STR-PROGRAM_OF_STUDY_TEXT sy-vline 
WA_PIQ_STUDENT_LIST_STR-RETURN_MESSAGE sy-vline      INTO ld_text SEPARATED BY SPACE.

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