ABAP Select data from SAP table PIQDB_NL_ISG 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_ISG 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_ISG. 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_ISG 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_ISG TYPE STANDARD TABLE OF PIQDB_NL_ISG,
      WA_PIQDB_NL_ISG TYPE PIQDB_NL_ISG,
      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_ISG> TYPE PIQDB_NL_ISG.

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM PIQDB_NL_ISG
*  INTO TABLE @DATA(IT_PIQDB_NL_ISG2).
*--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_ISG INDEX 1 INTO DATA(WA_PIQDB_NL_ISG2).


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

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

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_PIQDB_NL_ISG-REGADM_YEAR, sy-vline,
  WA_PIQDB_NL_ISG-REGMONTH_FRM, sy-vline,
  WA_PIQDB_NL_ISG-REG_EPHASCOD, sy-vline,
  WA_PIQDB_NL_ISG-SEQNR, sy-vline,
  WA_PIQDB_NL_ISG-REF_DATE, sy-vline,
  WA_PIQDB_NL_ISG-GUID, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_PIQDB_NL_ISG 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_ISG 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_ISG INTO WA_PIQDB_NL_ISG.


*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_ISG-STNUM
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_PIQDB_NL_ISG-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_ISG_STR, 
MANDT TYPE STRING,
STNUM TYPE STRING,
ECODE TYPE STRING,
ADM_AYEAR TYPE STRING,
EPHASCOD TYPE STRING,
REGADM_YEAR TYPE STRING,
REGMONTH_FRM TYPE STRING,
REG_EPHASCOD 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,
REG_BRINNO TYPE STRING,
REG_ECODE TYPE STRING,
FORMOFEDUCATION TYPE STRING,
ENROLLFORMCODE TYPE STRING,
MONTH_UNTL TYPE STRING,
GZOIND TYPE STRING,
BAMAIND TYPE STRING,END OF T_EKKO_STR.
DATA: WA_PIQDB_NL_ISG_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_ISG_STR-MANDT sy-vline 
WA_PIQDB_NL_ISG_STR-STNUM sy-vline 
WA_PIQDB_NL_ISG_STR-ECODE sy-vline 
WA_PIQDB_NL_ISG_STR-ADM_AYEAR sy-vline 
WA_PIQDB_NL_ISG_STR-EPHASCOD sy-vline 
WA_PIQDB_NL_ISG_STR-REGADM_YEAR sy-vline 
WA_PIQDB_NL_ISG_STR-REGMONTH_FRM sy-vline 
WA_PIQDB_NL_ISG_STR-REG_EPHASCOD sy-vline 
WA_PIQDB_NL_ISG_STR-SEQNR sy-vline 
WA_PIQDB_NL_ISG_STR-REF_DATE sy-vline 
WA_PIQDB_NL_ISG_STR-GUID sy-vline 
WA_PIQDB_NL_ISG_STR-RCD_TYPE sy-vline 
WA_PIQDB_NL_ISG_STR-BRINNO sy-vline 
WA_PIQDB_NL_ISG_STR-BSNNO sy-vline 
WA_PIQDB_NL_ISG_STR-OCWNO sy-vline 
WA_PIQDB_NL_ISG_STR-STLNKNO sy-vline 
WA_PIQDB_NL_ISG_STR-MONTH_FRM sy-vline 
WA_PIQDB_NL_ISG_STR-REG_BRINNO sy-vline 
WA_PIQDB_NL_ISG_STR-REG_ECODE sy-vline 
WA_PIQDB_NL_ISG_STR-FORMOFEDUCATION sy-vline 
WA_PIQDB_NL_ISG_STR-ENROLLFORMCODE sy-vline 
WA_PIQDB_NL_ISG_STR-MONTH_UNTL sy-vline 
WA_PIQDB_NL_ISG_STR-GZOIND sy-vline 
WA_PIQDB_NL_ISG_STR-BAMAIND sy-vline      INTO ld_text SEPARATED BY SPACE.

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