ABAP Select data from SAP table P2NZ_LVAWE into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP P2NZ_LVAWE 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 P2NZ_LVAWE. 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 P2NZ_LVAWE 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_P2NZ_LVAWE TYPE STANDARD TABLE OF P2NZ_LVAWE,
      WA_P2NZ_LVAWE TYPE P2NZ_LVAWE,
      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: <P2NZ_LVAWE> TYPE P2NZ_LVAWE.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_P2NZ_LVAWE.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM P2NZ_LVAWE
  INTO TABLE IT_P2NZ_LVAWE.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM P2NZ_LVAWE
*  INTO TABLE @DATA(IT_P2NZ_LVAWE2).
*--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_P2NZ_LVAWE INDEX 1 INTO DATA(WA_P2NZ_LVAWE2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_P2NZ_LVAWE ASSIGNING <P2NZ_LVAWE>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<P2NZ_LVAWE>-MANDT = 1.
<P2NZ_LVAWE>-DCT_PERNR = 1.
<P2NZ_LVAWE>-DCT_SEQNR = 1.
<P2NZ_LVAWE>-DCT_ROWID = 1.
<P2NZ_LVAWE>-KTART = 1.

ENDLOOP.

LOOP AT IT_P2NZ_LVAWE INTO WA_P2NZ_LVAWE.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_P2NZ_LVAWE-BEGDA, sy-vline,
  WA_P2NZ_LVAWE-ENDDA, sy-vline,
  WA_P2NZ_LVAWE-ANNDA, sy-vline,
  WA_P2NZ_LVAWE-INTNR, sy-vline,
  WA_P2NZ_LVAWE-QUONR, sy-vline,
  WA_P2NZ_LVAWE-GRSAM, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_P2NZ_LVAWE 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_P2NZ_LVAWE 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_P2NZ_LVAWE INTO WA_P2NZ_LVAWE.


*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_P2NZ_LVAWE_STR, 
MANDT TYPE STRING,
DCT_PERNR TYPE STRING,
DCT_SEQNR TYPE STRING,
DCT_ROWID TYPE STRING,
KTART TYPE STRING,
BEGDA TYPE STRING,
ENDDA TYPE STRING,
ANNDA TYPE STRING,
INTNR TYPE STRING,
QUONR TYPE STRING,
GRSAM TYPE STRING,
GRWKS TYPE STRING,
CWKAV TYPE STRING,
CWKAW TYPE STRING,
WKHRS TYPE STRING,
AWERT TYPE STRING,
STATUS TYPE STRING,
ACTION TYPE STRING,END OF T_EKKO_STR.
DATA: WA_P2NZ_LVAWE_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_P2NZ_LVAWE_STR-MANDT sy-vline 
WA_P2NZ_LVAWE_STR-DCT_PERNR sy-vline 
WA_P2NZ_LVAWE_STR-DCT_SEQNR sy-vline 
WA_P2NZ_LVAWE_STR-DCT_ROWID sy-vline 
WA_P2NZ_LVAWE_STR-KTART sy-vline 
WA_P2NZ_LVAWE_STR-BEGDA sy-vline 
WA_P2NZ_LVAWE_STR-ENDDA sy-vline 
WA_P2NZ_LVAWE_STR-ANNDA sy-vline 
WA_P2NZ_LVAWE_STR-INTNR sy-vline 
WA_P2NZ_LVAWE_STR-QUONR sy-vline 
WA_P2NZ_LVAWE_STR-GRSAM sy-vline 
WA_P2NZ_LVAWE_STR-GRWKS sy-vline 
WA_P2NZ_LVAWE_STR-CWKAV sy-vline 
WA_P2NZ_LVAWE_STR-CWKAW sy-vline 
WA_P2NZ_LVAWE_STR-WKHRS sy-vline 
WA_P2NZ_LVAWE_STR-AWERT sy-vline 
WA_P2NZ_LVAWE_STR-STATUS sy-vline 
WA_P2NZ_LVAWE_STR-ACTION sy-vline      INTO ld_text SEPARATED BY SPACE.

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