ABAP Select data from SAP table PIQ_NL_MESSAGE19 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_MESSAGE19 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_MESSAGE19. 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_MESSAGE19 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_MESSAGE19 TYPE STANDARD TABLE OF PIQ_NL_MESSAGE19,
      WA_PIQ_NL_MESSAGE19 TYPE PIQ_NL_MESSAGE19,
      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_MESSAGE19> TYPE PIQ_NL_MESSAGE19.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_PIQ_NL_MESSAGE19.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM PIQ_NL_MESSAGE19
  INTO TABLE IT_PIQ_NL_MESSAGE19.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM PIQ_NL_MESSAGE19
*  INTO TABLE @DATA(IT_PIQ_NL_MESSAGE192).
*--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_MESSAGE19 INDEX 1 INTO DATA(WA_PIQ_NL_MESSAGE192).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_PIQ_NL_MESSAGE19 ASSIGNING <PIQ_NL_MESSAGE19>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<PIQ_NL_MESSAGE19>-SOURCE = 1.
<PIQ_NL_MESSAGE19>-MSGID = 1.
<PIQ_NL_MESSAGE19>-SENDER = 1.
<PIQ_NL_MESSAGE19>-RECEIVER = 1.
<PIQ_NL_MESSAGE19>-PROCESSID = 1.

ENDLOOP.

LOOP AT IT_PIQ_NL_MESSAGE19 INTO WA_PIQ_NL_MESSAGE19.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_PIQ_NL_MESSAGE19-FILTERCODE, sy-vline,
  WA_PIQ_NL_MESSAGE19-COMPOSITENAME, sy-vline,
  WA_PIQ_NL_MESSAGE19-O_NUMBER, sy-vline,
  WA_PIQ_NL_MESSAGE19-STUDIELINK_NO, sy-vline,
  WA_PIQ_NL_MESSAGE19-OCW_NUMBER, sy-vline,
  WA_PIQ_NL_MESSAGE19-SSN_NUMBER, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_PIQ_NL_MESSAGE19 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_MESSAGE19 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_MESSAGE19 INTO WA_PIQ_NL_MESSAGE19.


*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_MESSAGE19_STR, 
SOURCE TYPE STRING,
MSGID TYPE STRING,
SENDER TYPE STRING,
RECEIVER TYPE STRING,
PROCESSID TYPE STRING,
FILTERCODE TYPE STRING,
COMPOSITENAME TYPE STRING,
O_NUMBER TYPE STRING,
STUDIELINK_NO TYPE STRING,
OCW_NUMBER TYPE STRING,
SSN_NUMBER 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,
REGNUM TYPE STRING,
UPDATED_REGNUM TYPE STRING,
PAIDATBRIN TYPE STRING,
PAIDATINSTITUTE TYPE STRING,
PAID TYPE STRING,
AMOUNTFEE TYPE STRING,END OF T_EKKO_STR.
DATA: WA_PIQ_NL_MESSAGE19_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_MESSAGE19_STR-SOURCE sy-vline 
WA_PIQ_NL_MESSAGE19_STR-MSGID sy-vline 
WA_PIQ_NL_MESSAGE19_STR-SENDER sy-vline 
WA_PIQ_NL_MESSAGE19_STR-RECEIVER sy-vline 
WA_PIQ_NL_MESSAGE19_STR-PROCESSID sy-vline 
WA_PIQ_NL_MESSAGE19_STR-FILTERCODE sy-vline 
WA_PIQ_NL_MESSAGE19_STR-COMPOSITENAME sy-vline 
WA_PIQ_NL_MESSAGE19_STR-O_NUMBER sy-vline 
WA_PIQ_NL_MESSAGE19_STR-STUDIELINK_NO sy-vline 
WA_PIQ_NL_MESSAGE19_STR-OCW_NUMBER sy-vline 
WA_PIQ_NL_MESSAGE19_STR-SSN_NUMBER sy-vline 
WA_PIQ_NL_MESSAGE19_STR-PROGCODE sy-vline 
WA_PIQ_NL_MESSAGE19_STR-ALTPROGCODE sy-vline 
WA_PIQ_NL_MESSAGE19_STR-BRINNUMBER sy-vline 
WA_PIQ_NL_MESSAGE19_STR-BRINSEQUENCE sy-vline 
WA_PIQ_NL_MESSAGE19_STR-FORMOFEDUCATION sy-vline 
WA_PIQ_NL_MESSAGE19_STR-LOCATIONEDU sy-vline 
WA_PIQ_NL_MESSAGE19_STR-EDUPHASECODE sy-vline 
WA_PIQ_NL_MESSAGE19_STR-ENROLLFORMCODE sy-vline 
WA_PIQ_NL_MESSAGE19_STR-YEAROFSTUDY sy-vline 
WA_PIQ_NL_MESSAGE19_STR-STARTMONTH sy-vline 
WA_PIQ_NL_MESSAGE19_STR-ENROLLMENTCODE sy-vline 
WA_PIQ_NL_MESSAGE19_STR-REGNUM sy-vline 
WA_PIQ_NL_MESSAGE19_STR-UPDATED_REGNUM sy-vline 
WA_PIQ_NL_MESSAGE19_STR-PAIDATBRIN sy-vline 
WA_PIQ_NL_MESSAGE19_STR-PAIDATINSTITUTE sy-vline 
WA_PIQ_NL_MESSAGE19_STR-PAID sy-vline 
WA_PIQ_NL_MESSAGE19_STR-AMOUNTFEE sy-vline      INTO ld_text SEPARATED BY SPACE.

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