ABAP Select data from SAP table HNZLVPAY into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM HNZLVPAY
*  INTO TABLE @DATA(IT_HNZLVPAY2).
*--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_HNZLVPAY INDEX 1 INTO DATA(WA_HNZLVPAY2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<HNZLVPAY>-MANDT = 1.
<HNZLVPAY>-PERNR = 1.
<HNZLVPAY>-FPPER = 1.
<HNZLVPAY>-INPER = 1.
<HNZLVPAY>-SEQNR = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_HNZLVPAY-RECNO, sy-vline,
  WA_HNZLVPAY-KTART, sy-vline,
  WA_HNZLVPAY-ANNDA, sy-vline,
  WA_HNZLVPAY-QUONR, sy-vline,
  WA_HNZLVPAY-QUODE, sy-vline,
  WA_HNZLVPAY-QUOUN, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_HNZLVPAY 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_HNZLVPAY 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_HNZLVPAY INTO WA_HNZLVPAY.


*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_HNZLVPAY_STR, 
MANDT TYPE STRING,
PERNR TYPE STRING,
FPPER TYPE STRING,
INPER TYPE STRING,
SEQNR TYPE STRING,
RECNO TYPE STRING,
KTART TYPE STRING,
ANNDA TYPE STRING,
QUONR TYPE STRING,
QUODE TYPE STRING,
QUOUN TYPE STRING,
PDAMT TYPE STRING,
ABBEG TYPE STRING,
ABEND TYPE STRING,
AWART TYPE STRING,
BEGDA TYPE STRING,
ENDDA TYPE STRING,
PAYCD TYPE STRING,
BEGUZ TYPE STRING,
CURCE TYPE STRING,END OF T_EKKO_STR.
DATA: WA_HNZLVPAY_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_HNZLVPAY_STR-MANDT sy-vline 
WA_HNZLVPAY_STR-PERNR sy-vline 
WA_HNZLVPAY_STR-FPPER sy-vline 
WA_HNZLVPAY_STR-INPER sy-vline 
WA_HNZLVPAY_STR-SEQNR sy-vline 
WA_HNZLVPAY_STR-RECNO sy-vline 
WA_HNZLVPAY_STR-KTART sy-vline 
WA_HNZLVPAY_STR-ANNDA sy-vline 
WA_HNZLVPAY_STR-QUONR sy-vline 
WA_HNZLVPAY_STR-QUODE sy-vline 
WA_HNZLVPAY_STR-QUOUN sy-vline 
WA_HNZLVPAY_STR-PDAMT sy-vline 
WA_HNZLVPAY_STR-ABBEG sy-vline 
WA_HNZLVPAY_STR-ABEND sy-vline 
WA_HNZLVPAY_STR-AWART sy-vline 
WA_HNZLVPAY_STR-BEGDA sy-vline 
WA_HNZLVPAY_STR-ENDDA sy-vline 
WA_HNZLVPAY_STR-PAYCD sy-vline 
WA_HNZLVPAY_STR-BEGUZ sy-vline 
WA_HNZLVPAY_STR-CURCE sy-vline      INTO ld_text SEPARATED BY SPACE.

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