ABAP Select data from SAP table P2RE_GARNT into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP P2RE_GARNT 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 P2RE_GARNT. 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 P2RE_GARNT 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_P2RE_GARNT TYPE STANDARD TABLE OF P2RE_GARNT,
      WA_P2RE_GARNT TYPE P2RE_GARNT,
      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: <P2RE_GARNT> TYPE P2RE_GARNT.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_P2RE_GARNT.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM P2RE_GARNT
  INTO TABLE IT_P2RE_GARNT.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM P2RE_GARNT
*  INTO TABLE @DATA(IT_P2RE_GARNT2).
*--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_P2RE_GARNT INDEX 1 INTO DATA(WA_P2RE_GARNT2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_P2RE_GARNT ASSIGNING <P2RE_GARNT>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<P2RE_GARNT>-MANDT = 1.
<P2RE_GARNT>-DCT_PERNR = 1.
<P2RE_GARNT>-DCT_SEQNR = 1.
<P2RE_GARNT>-DCT_ROWID = 1.
<P2RE_GARNT>-GMZNR = 1.

ENDLOOP.

LOOP AT IT_P2RE_GARNT INTO WA_P2RE_GARNT.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_P2RE_GARNT-BEGDA, sy-vline,
  WA_P2RE_GARNT-ENDDA, sy-vline,
  WA_P2RE_GARNT-GMTYP, sy-vline,
  WA_P2RE_GARNT-GMCID, sy-vline,
  WA_P2RE_GARNT-GMPNO, sy-vline,
  WA_P2RE_GARNT-WAERS, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_P2RE_GARNT 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_P2RE_GARNT 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_P2RE_GARNT INTO WA_P2RE_GARNT.


*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_P2RE_GARNT_STR, 
MANDT TYPE STRING,
DCT_PERNR TYPE STRING,
DCT_SEQNR TYPE STRING,
DCT_ROWID TYPE STRING,
GMZNR TYPE STRING,
BEGDA TYPE STRING,
ENDDA TYPE STRING,
GMTYP TYPE STRING,
GMCID TYPE STRING,
GMPNO TYPE STRING,
WAERS TYPE STRING,
GMAMT TYPE STRING,
GMTOT TYPE STRING,
GMNYD TYPE STRING,
GMNBT TYPE STRING,
GMIPR TYPE STRING,
BTZNR TYPE STRING,
INERB TYPE STRING,END OF T_EKKO_STR.
DATA: WA_P2RE_GARNT_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_P2RE_GARNT_STR-MANDT sy-vline 
WA_P2RE_GARNT_STR-DCT_PERNR sy-vline 
WA_P2RE_GARNT_STR-DCT_SEQNR sy-vline 
WA_P2RE_GARNT_STR-DCT_ROWID sy-vline 
WA_P2RE_GARNT_STR-GMZNR sy-vline 
WA_P2RE_GARNT_STR-BEGDA sy-vline 
WA_P2RE_GARNT_STR-ENDDA sy-vline 
WA_P2RE_GARNT_STR-GMTYP sy-vline 
WA_P2RE_GARNT_STR-GMCID sy-vline 
WA_P2RE_GARNT_STR-GMPNO sy-vline 
WA_P2RE_GARNT_STR-WAERS sy-vline 
WA_P2RE_GARNT_STR-GMAMT sy-vline 
WA_P2RE_GARNT_STR-GMTOT sy-vline 
WA_P2RE_GARNT_STR-GMNYD sy-vline 
WA_P2RE_GARNT_STR-GMNBT sy-vline 
WA_P2RE_GARNT_STR-GMIPR sy-vline 
WA_P2RE_GARNT_STR-BTZNR sy-vline 
WA_P2RE_GARNT_STR-INERB sy-vline      INTO ld_text SEPARATED BY SPACE.

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