ABAP Select data from SAP table PIQ_GET_STUDENT_DATA into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP PIQ_GET_STUDENT_DATA 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_GET_STUDENT_DATA. 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_GET_STUDENT_DATA 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_GET_STUDENT_DATA TYPE STANDARD TABLE OF PIQ_GET_STUDENT_DATA,
      WA_PIQ_GET_STUDENT_DATA TYPE PIQ_GET_STUDENT_DATA,
      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_GET_STUDENT_DATA> TYPE PIQ_GET_STUDENT_DATA.

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM PIQ_GET_STUDENT_DATA
*  INTO TABLE @DATA(IT_PIQ_GET_STUDENT_DATA2).
*--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_GET_STUDENT_DATA INDEX 1 INTO DATA(WA_PIQ_GET_STUDENT_DATA2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<PIQ_GET_STUDENT_DATA>-PLVAR = 1.
<PIQ_GET_STUDENT_DATA>-OTYPE = 1.
<PIQ_GET_STUDENT_DATA>-OBJID = 1.
<PIQ_GET_STUDENT_DATA>-CONT_PROGRAM = 1.
<PIQ_GET_STUDENT_DATA>-CONT_PROGRAMTYPE = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_PIQ_GET_STUDENT_DATA-CONT_PERYR, sy-vline,
  WA_PIQ_GET_STUDENT_DATA-CONT_PERID, sy-vline,
  WA_PIQ_GET_STUDENT_DATA-MANDATORY, sy-vline,
  WA_PIQ_GET_STUDENT_DATA-TIMEP0001, sy-vline,
  WA_PIQ_GET_STUDENT_DATA-TIMEP0002, sy-vline,
  WA_PIQ_GET_STUDENT_DATA-TIMEP0003, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_PIQ_GET_STUDENT_DATA 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_GET_STUDENT_DATA 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_GET_STUDENT_DATA INTO WA_PIQ_GET_STUDENT_DATA.


*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 CUNIT, internal->external for field CPUNIT
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_PIQ_GET_STUDENT_DATA-CPUNIT
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_PIQ_GET_STUDENT_DATA-CPUNIT.
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_GET_STUDENT_DATA_STR, 
PLVAR TYPE STRING,
OTYPE TYPE STRING,
OBJID TYPE STRING,
CONT_PROGRAM TYPE STRING,
CONT_PROGRAMTYPE TYPE STRING,
CONT_PERYR TYPE STRING,
CONT_PERID TYPE STRING,
MANDATORY TYPE STRING,
TIMEP0001 TYPE STRING,
TIMEP0002 TYPE STRING,
TIMEP0003 TYPE STRING,
STORREASON TYPE STRING,
STORDATE TYPE STRING,
CPATTEMP TYPE STRING,
CPGAINED TYPE STRING,
CPUNIT TYPE STRING,
BOOKREASON TYPE STRING,
BOOKDATE TYPE STRING,
SMRATING TYPE STRING,
CHARGEFREE TYPE STRING,END OF T_EKKO_STR.
DATA: WA_PIQ_GET_STUDENT_DATA_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_GET_STUDENT_DATA_STR-PLVAR sy-vline 
WA_PIQ_GET_STUDENT_DATA_STR-OTYPE sy-vline 
WA_PIQ_GET_STUDENT_DATA_STR-OBJID sy-vline 
WA_PIQ_GET_STUDENT_DATA_STR-CONT_PROGRAM sy-vline 
WA_PIQ_GET_STUDENT_DATA_STR-CONT_PROGRAMTYPE sy-vline 
WA_PIQ_GET_STUDENT_DATA_STR-CONT_PERYR sy-vline 
WA_PIQ_GET_STUDENT_DATA_STR-CONT_PERID sy-vline 
WA_PIQ_GET_STUDENT_DATA_STR-MANDATORY sy-vline 
WA_PIQ_GET_STUDENT_DATA_STR-TIMEP0001 sy-vline 
WA_PIQ_GET_STUDENT_DATA_STR-TIMEP0002 sy-vline 
WA_PIQ_GET_STUDENT_DATA_STR-TIMEP0003 sy-vline 
WA_PIQ_GET_STUDENT_DATA_STR-STORREASON sy-vline 
WA_PIQ_GET_STUDENT_DATA_STR-STORDATE sy-vline 
WA_PIQ_GET_STUDENT_DATA_STR-CPATTEMP sy-vline 
WA_PIQ_GET_STUDENT_DATA_STR-CPGAINED sy-vline 
WA_PIQ_GET_STUDENT_DATA_STR-CPUNIT sy-vline 
WA_PIQ_GET_STUDENT_DATA_STR-BOOKREASON sy-vline 
WA_PIQ_GET_STUDENT_DATA_STR-BOOKDATE sy-vline 
WA_PIQ_GET_STUDENT_DATA_STR-SMRATING sy-vline 
WA_PIQ_GET_STUDENT_DATA_STR-CHARGEFREE sy-vline      INTO ld_text SEPARATED BY SPACE.

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