ABAP Select data from SAP table PNWTYH_ALV into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM PNWTYH_ALV
*  INTO TABLE @DATA(IT_PNWTYH_ALV2).
*--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_PNWTYH_ALV INDEX 1 INTO DATA(WA_PNWTYH_ALV2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<PNWTYH_ALV>-CLMNO = 1.
<PNWTYH_ALV>-CLMTY = 1.
<PNWTYH_ALV>-REFDT = 1.
<PNWTYH_ALV>-REFNO = 1.
<PNWTYH_ALV>-OLDCN = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_PNWTYH_ALV-AUTNO, sy-vline,
  WA_PNWTYH_ALV-AUTNA, sy-vline,
  WA_PNWTYH_ALV-CLERK, sy-vline,
  WA_PNWTYH_ALV-RELTY, sy-vline,
  WA_PNWTYH_ALV-RELOB_EXT, sy-vline,
  WA_PNWTYH_ALV-RELOB, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_PNWTYH_ALV 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_PNWTYH_ALV 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_PNWTYH_ALV INTO WA_PNWTYH_ALV.


*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 ALPHA, internal->external for field CLMNO
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_PNWTYH_ALV-CLMNO
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_PNWTYH_ALV-CLMNO.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field OLDCN
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_PNWTYH_ALV-OLDCN
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_PNWTYH_ALV-OLDCN.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field PARNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_PNWTYH_ALV-PARNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_PNWTYH_ALV-PARNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit PARVW, internal->external for field PARVW
CALL FUNCTION 'CONVERSION_EXIT_PARVW_OUTPUT'
  EXPORTING
    input =                      WA_PNWTYH_ALV-PARVW
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_PNWTYH_ALV-PARVW.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field QMNUM
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_PNWTYH_ALV-QMNUM
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_PNWTYH_ALV-QMNUM.
WRITE:/ 'New Value:', ld_input.

*Conversion exit GERNR, internal->external for field SERNO
CALL FUNCTION 'CONVERSION_EXIT_GERNR_OUTPUT'
  EXPORTING
    input =                      WA_PNWTYH_ALV-SERNO
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_PNWTYH_ALV-SERNO.
WRITE:/ 'New Value:', ld_input.

*Conversion exit GERNR, internal->external for field SERNO2
CALL FUNCTION 'CONVERSION_EXIT_GERNR_OUTPUT'
  EXPORTING
    input =                      WA_PNWTYH_ALV-SERNO2
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_PNWTYH_ALV-SERNO2.
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_PNWTYH_ALV_STR, 
CLMNO TYPE STRING,
CLMTY TYPE STRING,
REFDT TYPE STRING,
REFNO TYPE STRING,
OLDCN TYPE STRING,
AUTNO TYPE STRING,
AUTNA TYPE STRING,
CLERK TYPE STRING,
RELTY TYPE STRING,
RELOB_EXT TYPE STRING,
RELOB TYPE STRING,
RELOT TYPE STRING,
RELDT TYPE STRING,
PARNR TYPE STRING,
PARVW TYPE STRING,
OBJNR TYPE STRING,
ASTATE TYPE STRING,
WERKS TYPE STRING,
QMNUM TYPE STRING,
LOG_HANDLE TYPE STRING,
LOG_MESSAGE TYPE STRING,
CLMGRP TYPE STRING,
RESULT_OUT_MWTY TYPE STRING,
RESULT_IN_MWTY TYPE STRING,
RELTY2 TYPE STRING,
RELOB_EXT2 TYPE STRING,
RELOB2 TYPE STRING,
SERNO TYPE STRING,
SERNO2 TYPE STRING,
CBACTIONDT TYPE STRING,
OR_DUMMY TYPE STRING,
CLOSE_DATE TYPE STRING,
ARCHIV_FLAG TYPE STRING,
CREADAT TYPE STRING,
CREABY TYPE STRING,
CHNGDAT TYPE STRING,
CHNGBY TYPE STRING,END OF T_EKKO_STR.
DATA: WA_PNWTYH_ALV_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_PNWTYH_ALV_STR-CLMNO sy-vline 
WA_PNWTYH_ALV_STR-CLMTY sy-vline 
WA_PNWTYH_ALV_STR-REFDT sy-vline 
WA_PNWTYH_ALV_STR-REFNO sy-vline 
WA_PNWTYH_ALV_STR-OLDCN sy-vline 
WA_PNWTYH_ALV_STR-AUTNO sy-vline 
WA_PNWTYH_ALV_STR-AUTNA sy-vline 
WA_PNWTYH_ALV_STR-CLERK sy-vline 
WA_PNWTYH_ALV_STR-RELTY sy-vline 
WA_PNWTYH_ALV_STR-RELOB_EXT sy-vline 
WA_PNWTYH_ALV_STR-RELOB sy-vline 
WA_PNWTYH_ALV_STR-RELOT sy-vline 
WA_PNWTYH_ALV_STR-RELDT sy-vline 
WA_PNWTYH_ALV_STR-PARNR sy-vline 
WA_PNWTYH_ALV_STR-PARVW sy-vline 
WA_PNWTYH_ALV_STR-OBJNR sy-vline 
WA_PNWTYH_ALV_STR-ASTATE sy-vline 
WA_PNWTYH_ALV_STR-WERKS sy-vline 
WA_PNWTYH_ALV_STR-QMNUM sy-vline 
WA_PNWTYH_ALV_STR-LOG_HANDLE sy-vline 
WA_PNWTYH_ALV_STR-LOG_MESSAGE sy-vline 
WA_PNWTYH_ALV_STR-CLMGRP sy-vline 
WA_PNWTYH_ALV_STR-RESULT_OUT_MWTY sy-vline 
WA_PNWTYH_ALV_STR-RESULT_IN_MWTY sy-vline 
WA_PNWTYH_ALV_STR-RELTY2 sy-vline 
WA_PNWTYH_ALV_STR-RELOB_EXT2 sy-vline 
WA_PNWTYH_ALV_STR-RELOB2 sy-vline 
WA_PNWTYH_ALV_STR-SERNO sy-vline 
WA_PNWTYH_ALV_STR-SERNO2 sy-vline 
WA_PNWTYH_ALV_STR-CBACTIONDT sy-vline 
WA_PNWTYH_ALV_STR-OR_DUMMY sy-vline 
WA_PNWTYH_ALV_STR-CLOSE_DATE sy-vline 
WA_PNWTYH_ALV_STR-ARCHIV_FLAG sy-vline 
WA_PNWTYH_ALV_STR-CREADAT sy-vline 
WA_PNWTYH_ALV_STR-CREABY sy-vline 
WA_PNWTYH_ALV_STR-CHNGDAT sy-vline 
WA_PNWTYH_ALV_STR-CHNGBY sy-vline      INTO ld_text SEPARATED BY SPACE.

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