ABAP Select data from SAP table PIQDB_NL_TKG into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM PIQDB_NL_TKG
*  INTO TABLE @DATA(IT_PIQDB_NL_TKG2).
*--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_PIQDB_NL_TKG INDEX 1 INTO DATA(WA_PIQDB_NL_TKG2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<PIQDB_NL_TKG>-MANDT = 1.
<PIQDB_NL_TKG>-STNUM = 1.
<PIQDB_NL_TKG>-ECODE = 1.
<PIQDB_NL_TKG>-EPHASCOD = 1.
<PIQDB_NL_TKG>-ADM_AYEAR = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_PIQDB_NL_TKG-SEQNR, sy-vline,
  WA_PIQDB_NL_TKG-REF_DATE, sy-vline,
  WA_PIQDB_NL_TKG-GUID, sy-vline,
  WA_PIQDB_NL_TKG-RCD_TYPE, sy-vline,
  WA_PIQDB_NL_TKG-BRINNO, sy-vline,
  WA_PIQDB_NL_TKG-BSNNO, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_PIQDB_NL_TKG 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_PIQDB_NL_TKG 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_PIQDB_NL_TKG INTO WA_PIQDB_NL_TKG.


*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 STNUM
CALL FUNCTION 'CONVERSION_EXIT_PIQST_OUTPUT'
  EXPORTING
    input =                      WA_PIQDB_NL_TKG-STNUM
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_PIQDB_NL_TKG-STNUM.
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_PIQDB_NL_TKG_STR, 
MANDT TYPE STRING,
STNUM TYPE STRING,
ECODE TYPE STRING,
EPHASCOD TYPE STRING,
ADM_AYEAR TYPE STRING,
SEQNR TYPE STRING,
REF_DATE TYPE STRING,
GUID TYPE STRING,
RCD_TYPE TYPE STRING,
BRINNO TYPE STRING,
BSNNO TYPE STRING,
OCWNO TYPE STRING,
STLNKNO TYPE STRING,
MONTH_FRM TYPE STRING,
TUIFEEIND TYPE STRING,
HGRADIND TYPE STRING,
HEDUIND TYPE STRING,
MGRADIND TYPE STRING,
MEDUIND TYPE STRING,
FUNCIND TYPE STRING,
HYEAR TYPE STRING,
HEDUYEAR TYPE STRING,
MYEAR TYPE STRING,
MEDUYEAR TYPE STRING,
RESIND TYPE STRING,
NATREQIND TYPE STRING,
TOTTUIFEEIND TYPE STRING,END OF T_EKKO_STR.
DATA: WA_PIQDB_NL_TKG_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_PIQDB_NL_TKG_STR-MANDT sy-vline 
WA_PIQDB_NL_TKG_STR-STNUM sy-vline 
WA_PIQDB_NL_TKG_STR-ECODE sy-vline 
WA_PIQDB_NL_TKG_STR-EPHASCOD sy-vline 
WA_PIQDB_NL_TKG_STR-ADM_AYEAR sy-vline 
WA_PIQDB_NL_TKG_STR-SEQNR sy-vline 
WA_PIQDB_NL_TKG_STR-REF_DATE sy-vline 
WA_PIQDB_NL_TKG_STR-GUID sy-vline 
WA_PIQDB_NL_TKG_STR-RCD_TYPE sy-vline 
WA_PIQDB_NL_TKG_STR-BRINNO sy-vline 
WA_PIQDB_NL_TKG_STR-BSNNO sy-vline 
WA_PIQDB_NL_TKG_STR-OCWNO sy-vline 
WA_PIQDB_NL_TKG_STR-STLNKNO sy-vline 
WA_PIQDB_NL_TKG_STR-MONTH_FRM sy-vline 
WA_PIQDB_NL_TKG_STR-TUIFEEIND sy-vline 
WA_PIQDB_NL_TKG_STR-HGRADIND sy-vline 
WA_PIQDB_NL_TKG_STR-HEDUIND sy-vline 
WA_PIQDB_NL_TKG_STR-MGRADIND sy-vline 
WA_PIQDB_NL_TKG_STR-MEDUIND sy-vline 
WA_PIQDB_NL_TKG_STR-FUNCIND sy-vline 
WA_PIQDB_NL_TKG_STR-HYEAR sy-vline 
WA_PIQDB_NL_TKG_STR-HEDUYEAR sy-vline 
WA_PIQDB_NL_TKG_STR-MYEAR sy-vline 
WA_PIQDB_NL_TKG_STR-MEDUYEAR sy-vline 
WA_PIQDB_NL_TKG_STR-RESIND sy-vline 
WA_PIQDB_NL_TKG_STR-NATREQIND sy-vline 
WA_PIQDB_NL_TKG_STR-TOTTUIFEEIND sy-vline      INTO ld_text SEPARATED BY SPACE.

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