ABAP Select data from SAP table PIQ_NL_STUDIELINKMESSAGE39 into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP PIQ_NL_STUDIELINKMESSAGE39 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_NL_STUDIELINKMESSAGE39. 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_NL_STUDIELINKMESSAGE39 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_NL_STUDIELINKMESSAGE39 TYPE STANDARD TABLE OF PIQ_NL_STUDIELINKMESSAGE39,
      WA_PIQ_NL_STUDIELINKMESSAGE39 TYPE PIQ_NL_STUDIELINKMESSAGE39,
      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_NL_STUDIELINKMESSAGE39> TYPE PIQ_NL_STUDIELINKMESSAGE39.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_PIQ_NL_STUDIELINKMESSAGE39.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM PIQ_NL_STUDIELINKMESSAGE39
  INTO TABLE IT_PIQ_NL_STUDIELINKMESSAGE39.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM PIQ_NL_STUDIELINKMESSAGE39
*  INTO TABLE @DATA(IT_PIQ_NL_STUDIELINKMESSAGE392).
*--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_NL_STUDIELINKMESSAGE39 INDEX 1 INTO DATA(WA_PIQ_NL_STUDIELINKMESSAGE392).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_PIQ_NL_STUDIELINKMESSAGE39 ASSIGNING <PIQ_NL_STUDIELINKMESSAGE39>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<PIQ_NL_STUDIELINKMESSAGE39>-CONTROLLER = 1.
<PIQ_NL_STUDIELINKMESSAGE39>-SL_HEADER = 1.
<PIQ_NL_STUDIELINKMESSAGE39>-CONTROLLER = 1.
<PIQ_NL_STUDIELINKMESSAGE39>-SOURCE = 1.
<PIQ_NL_STUDIELINKMESSAGE39>-MSGID = 1.

ENDLOOP.

LOOP AT IT_PIQ_NL_STUDIELINKMESSAGE39 INTO WA_PIQ_NL_STUDIELINKMESSAGE39.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_PIQ_NL_STUDIELINKMESSAGE39-SENDER, sy-vline,
  WA_PIQ_NL_STUDIELINKMESSAGE39-SL_RECEIVER, sy-vline,
  WA_PIQ_NL_STUDIELINKMESSAGE39-PROCESSID, sy-vline,
  WA_PIQ_NL_STUDIELINKMESSAGE39-FILTERCODE, sy-vline,
  WA_PIQ_NL_STUDIELINKMESSAGE39-VERSION, sy-vline,
  WA_PIQ_NL_STUDIELINKMESSAGE39-COMPOSITENAME, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_PIQ_NL_STUDIELINKMESSAGE39 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_NL_STUDIELINKMESSAGE39 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_NL_STUDIELINKMESSAGE39 INTO WA_PIQ_NL_STUDIELINKMESSAGE39.


*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_PIQ_NL_STUDIELINKMESSAGE39_STR, 
CONTROLLER TYPE STRING,
SL_HEADER TYPE STRING,
CONTROLLER TYPE STRING,
SOURCE TYPE STRING,
MSGID TYPE STRING,
SENDER TYPE STRING,
SL_RECEIVER TYPE STRING,
PROCESSID TYPE STRING,
FILTERCODE TYPE STRING,
VERSION TYPE STRING,
COMPOSITENAME TYPE STRING,
SL_IDENTIFYNUMBERS TYPE STRING,
CONTROLLER TYPE STRING,
O_NUMBER TYPE STRING,
STUDIELINK_NO TYPE STRING,
OCW_NUMBER TYPE STRING,
SSN_NUMBER TYPE STRING,
DECISIONDATE TYPE STRING,
SL_EDUCATION TYPE STRING,
CONTROLLER TYPE STRING,
PROGCODE TYPE STRING,
ALTPROGCODE TYPE STRING,
BRINNUMBER TYPE STRING,
BRINSEQUENCE TYPE STRING,
FORMOFEDUCATION TYPE STRING,
LOCATIONEDU TYPE STRING,
EDUPHASECODE TYPE STRING,
ENROLLFORMCODE TYPE STRING,
YEAROFSTUDY TYPE STRING,
STARTMONTH TYPE STRING,
ENROLLMENTCODE TYPE STRING,
REG_NUM TYPE STRING,
UPD_REG_NUM TYPE STRING,
PROOFPLACEISSUEDATE TYPE STRING,
LOTTERYRESULT TYPE STRING,
REASONFORRESEVE TYPE STRING,
IBGSTATUS TYPE STRING,
REASONFORREJECT TYPE STRING,
DEFICIENCYSTATUS TYPE STRING,
ACTIVITIESSTATUS TYPE STRING,
LANGTEST TYPE STRING,END OF T_EKKO_STR.
DATA: WA_PIQ_NL_STUDIELINKMESSAGE39_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_NL_STUDIELINKMESSAGE39_STR-CONTROLLER sy-vline 
WA_PIQ_NL_STUDIELINKMESSAGE39_STR-SL_HEADER sy-vline 
WA_PIQ_NL_STUDIELINKMESSAGE39_STR-CONTROLLER sy-vline 
WA_PIQ_NL_STUDIELINKMESSAGE39_STR-SOURCE sy-vline 
WA_PIQ_NL_STUDIELINKMESSAGE39_STR-MSGID sy-vline 
WA_PIQ_NL_STUDIELINKMESSAGE39_STR-SENDER sy-vline 
WA_PIQ_NL_STUDIELINKMESSAGE39_STR-SL_RECEIVER sy-vline 
WA_PIQ_NL_STUDIELINKMESSAGE39_STR-PROCESSID sy-vline 
WA_PIQ_NL_STUDIELINKMESSAGE39_STR-FILTERCODE sy-vline 
WA_PIQ_NL_STUDIELINKMESSAGE39_STR-VERSION sy-vline 
WA_PIQ_NL_STUDIELINKMESSAGE39_STR-COMPOSITENAME sy-vline 
WA_PIQ_NL_STUDIELINKMESSAGE39_STR-SL_IDENTIFYNUMBERS sy-vline 
WA_PIQ_NL_STUDIELINKMESSAGE39_STR-CONTROLLER sy-vline 
WA_PIQ_NL_STUDIELINKMESSAGE39_STR-O_NUMBER sy-vline 
WA_PIQ_NL_STUDIELINKMESSAGE39_STR-STUDIELINK_NO sy-vline 
WA_PIQ_NL_STUDIELINKMESSAGE39_STR-OCW_NUMBER sy-vline 
WA_PIQ_NL_STUDIELINKMESSAGE39_STR-SSN_NUMBER sy-vline 
WA_PIQ_NL_STUDIELINKMESSAGE39_STR-DECISIONDATE sy-vline 
WA_PIQ_NL_STUDIELINKMESSAGE39_STR-SL_EDUCATION sy-vline 
WA_PIQ_NL_STUDIELINKMESSAGE39_STR-CONTROLLER sy-vline 
WA_PIQ_NL_STUDIELINKMESSAGE39_STR-PROGCODE sy-vline 
WA_PIQ_NL_STUDIELINKMESSAGE39_STR-ALTPROGCODE sy-vline 
WA_PIQ_NL_STUDIELINKMESSAGE39_STR-BRINNUMBER sy-vline 
WA_PIQ_NL_STUDIELINKMESSAGE39_STR-BRINSEQUENCE sy-vline 
WA_PIQ_NL_STUDIELINKMESSAGE39_STR-FORMOFEDUCATION sy-vline 
WA_PIQ_NL_STUDIELINKMESSAGE39_STR-LOCATIONEDU sy-vline 
WA_PIQ_NL_STUDIELINKMESSAGE39_STR-EDUPHASECODE sy-vline 
WA_PIQ_NL_STUDIELINKMESSAGE39_STR-ENROLLFORMCODE sy-vline 
WA_PIQ_NL_STUDIELINKMESSAGE39_STR-YEAROFSTUDY sy-vline 
WA_PIQ_NL_STUDIELINKMESSAGE39_STR-STARTMONTH sy-vline 
WA_PIQ_NL_STUDIELINKMESSAGE39_STR-ENROLLMENTCODE sy-vline 
WA_PIQ_NL_STUDIELINKMESSAGE39_STR-REG_NUM sy-vline 
WA_PIQ_NL_STUDIELINKMESSAGE39_STR-UPD_REG_NUM sy-vline 
WA_PIQ_NL_STUDIELINKMESSAGE39_STR-PROOFPLACEISSUEDATE sy-vline 
WA_PIQ_NL_STUDIELINKMESSAGE39_STR-LOTTERYRESULT sy-vline 
WA_PIQ_NL_STUDIELINKMESSAGE39_STR-REASONFORRESEVE sy-vline 
WA_PIQ_NL_STUDIELINKMESSAGE39_STR-IBGSTATUS sy-vline 
WA_PIQ_NL_STUDIELINKMESSAGE39_STR-REASONFORREJECT sy-vline 
WA_PIQ_NL_STUDIELINKMESSAGE39_STR-DEFICIENCYSTATUS sy-vline 
WA_PIQ_NL_STUDIELINKMESSAGE39_STR-ACTIVITIESSTATUS sy-vline 
WA_PIQ_NL_STUDIELINKMESSAGE39_STR-LANGTEST sy-vline      INTO ld_text SEPARATED BY SPACE.

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