ABAP Select data from SAP table P3542 into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP P3542 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 P3542. 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 P3542 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_P3542 TYPE STANDARD TABLE OF P3542,
      WA_P3542 TYPE P3542,
      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: <P3542> TYPE P3542.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_P3542.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM P3542
  INTO TABLE IT_P3542.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM P3542
*  INTO TABLE @DATA(IT_P35422).
*--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_P3542 INDEX 1 INTO DATA(WA_P35422).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_P3542 ASSIGNING <P3542>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<P3542>-PERNR = 1.
<P3542>-INFTY = 1.
<P3542>-SUBTY = 1.
<P3542>-OBJPS = 1.
<P3542>-SPRPS = 1.

ENDLOOP.

LOOP AT IT_P3542 INTO WA_P3542.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_P3542-ENDDA, sy-vline,
  WA_P3542-BEGDA, sy-vline,
  WA_P3542-SEQNR, sy-vline,
  WA_P3542-AEDTM, sy-vline,
  WA_P3542-UNAME, sy-vline,
  WA_P3542-HISTO, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_P3542 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_P3542 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_P3542 INTO WA_P3542.


*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_P3542_STR, 
PERNR TYPE STRING,
INFTY TYPE STRING,
SUBTY TYPE STRING,
OBJPS TYPE STRING,
SPRPS TYPE STRING,
ENDDA TYPE STRING,
BEGDA TYPE STRING,
SEQNR TYPE STRING,
AEDTM TYPE STRING,
UNAME TYPE STRING,
HISTO TYPE STRING,
ITXEX TYPE STRING,
REFEX TYPE STRING,
ORDEX TYPE STRING,
ITBLD TYPE STRING,
PREAS TYPE STRING,
FLAG1 TYPE STRING,
FLAG2 TYPE STRING,
FLAG3 TYPE STRING,
FLAG4 TYPE STRING,
RESE1 TYPE STRING,
RESE2 TYPE STRING,
GRPVL TYPE STRING,
BIZNO TYPE STRING,
COMNM TYPE STRING,
TXPAS TYPE STRING,
PABEG TYPE STRING,
PAEND TYPE STRING,
EXBEG TYPE STRING,
EXEND TYPE STRING,
LGA01 TYPE STRING,
BET01 TYPE STRING,
LGA02 TYPE STRING,
BET02 TYPE STRING,
LGA03 TYPE STRING,
BET03 TYPE STRING,
LGA04 TYPE STRING,
BET04 TYPE STRING,
LGA05 TYPE STRING,
BET05 TYPE STRING,
LGA06 TYPE STRING,
BET06 TYPE STRING,
LGA07 TYPE STRING,
BET07 TYPE STRING,
LGA08 TYPE STRING,
BET08 TYPE STRING,
LGA09 TYPE STRING,
BET09 TYPE STRING,
LGA10 TYPE STRING,
BET10 TYPE STRING,
LGA11 TYPE STRING,
BET11 TYPE STRING,
LGA12 TYPE STRING,
BET12 TYPE STRING,
LGA13 TYPE STRING,
BET13 TYPE STRING,
LGA14 TYPE STRING,
BET14 TYPE STRING,
LGA15 TYPE STRING,
BET15 TYPE STRING,
LGA16 TYPE STRING,
BET16 TYPE STRING,
LGA17 TYPE STRING,
BET17 TYPE STRING,
LGA18 TYPE STRING,
BET18 TYPE STRING,
LGA19 TYPE STRING,
BET19 TYPE STRING,
LGA20 TYPE STRING,
BET20 TYPE STRING,
LGA21 TYPE STRING,
BET21 TYPE STRING,
LGA22 TYPE STRING,
BET22 TYPE STRING,
LGA23 TYPE STRING,
BET23 TYPE STRING,
LGA24 TYPE STRING,
BET24 TYPE STRING,
LGA25 TYPE STRING,
BET25 TYPE STRING,
LGA26 TYPE STRING,
BET26 TYPE STRING,
LGA27 TYPE STRING,
BET27 TYPE STRING,
LGA28 TYPE STRING,
BET28 TYPE STRING,
LGA29 TYPE STRING,
BET29 TYPE STRING,
LGA30 TYPE STRING,
BET30 TYPE STRING,
LGA31 TYPE STRING,
BET31 TYPE STRING,
LGA32 TYPE STRING,
BET32 TYPE STRING,
LGA33 TYPE STRING,
BET33 TYPE STRING,
LGA34 TYPE STRING,
BET34 TYPE STRING,
LGA35 TYPE STRING,
BET35 TYPE STRING,
LGA36 TYPE STRING,
BET36 TYPE STRING,
LGA37 TYPE STRING,
BET37 TYPE STRING,
LGA38 TYPE STRING,
BET38 TYPE STRING,
LGA39 TYPE STRING,
BET39 TYPE STRING,
LGA40 TYPE STRING,
BET40 TYPE STRING,
LGA41 TYPE STRING,
BET41 TYPE STRING,
LGA42 TYPE STRING,
BET42 TYPE STRING,
LGA43 TYPE STRING,
BET43 TYPE STRING,
LGA44 TYPE STRING,
BET44 TYPE STRING,
LGA45 TYPE STRING,
BET45 TYPE STRING,
OPTYP TYPE STRING,
RPTYP TYPE STRING,
EXTAX TYPE STRING,END OF T_EKKO_STR.
DATA: WA_P3542_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_P3542_STR-PERNR sy-vline 
WA_P3542_STR-INFTY sy-vline 
WA_P3542_STR-SUBTY sy-vline 
WA_P3542_STR-OBJPS sy-vline 
WA_P3542_STR-SPRPS sy-vline 
WA_P3542_STR-ENDDA sy-vline 
WA_P3542_STR-BEGDA sy-vline 
WA_P3542_STR-SEQNR sy-vline 
WA_P3542_STR-AEDTM sy-vline 
WA_P3542_STR-UNAME sy-vline 
WA_P3542_STR-HISTO sy-vline 
WA_P3542_STR-ITXEX sy-vline 
WA_P3542_STR-REFEX sy-vline 
WA_P3542_STR-ORDEX sy-vline 
WA_P3542_STR-ITBLD sy-vline 
WA_P3542_STR-PREAS sy-vline 
WA_P3542_STR-FLAG1 sy-vline 
WA_P3542_STR-FLAG2 sy-vline 
WA_P3542_STR-FLAG3 sy-vline 
WA_P3542_STR-FLAG4 sy-vline 
WA_P3542_STR-RESE1 sy-vline 
WA_P3542_STR-RESE2 sy-vline 
WA_P3542_STR-GRPVL sy-vline 
WA_P3542_STR-BIZNO sy-vline 
WA_P3542_STR-COMNM sy-vline 
WA_P3542_STR-TXPAS sy-vline 
WA_P3542_STR-PABEG sy-vline 
WA_P3542_STR-PAEND sy-vline 
WA_P3542_STR-EXBEG sy-vline 
WA_P3542_STR-EXEND sy-vline 
WA_P3542_STR-LGA01 sy-vline 
WA_P3542_STR-BET01 sy-vline 
WA_P3542_STR-LGA02 sy-vline 
WA_P3542_STR-BET02 sy-vline 
WA_P3542_STR-LGA03 sy-vline 
WA_P3542_STR-BET03 sy-vline 
WA_P3542_STR-LGA04 sy-vline 
WA_P3542_STR-BET04 sy-vline 
WA_P3542_STR-LGA05 sy-vline 
WA_P3542_STR-BET05 sy-vline 
WA_P3542_STR-LGA06 sy-vline 
WA_P3542_STR-BET06 sy-vline 
WA_P3542_STR-LGA07 sy-vline 
WA_P3542_STR-BET07 sy-vline 
WA_P3542_STR-LGA08 sy-vline 
WA_P3542_STR-BET08 sy-vline 
WA_P3542_STR-LGA09 sy-vline 
WA_P3542_STR-BET09 sy-vline 
WA_P3542_STR-LGA10 sy-vline 
WA_P3542_STR-BET10 sy-vline 
WA_P3542_STR-LGA11 sy-vline 
WA_P3542_STR-BET11 sy-vline 
WA_P3542_STR-LGA12 sy-vline 
WA_P3542_STR-BET12 sy-vline 
WA_P3542_STR-LGA13 sy-vline 
WA_P3542_STR-BET13 sy-vline 
WA_P3542_STR-LGA14 sy-vline 
WA_P3542_STR-BET14 sy-vline 
WA_P3542_STR-LGA15 sy-vline 
WA_P3542_STR-BET15 sy-vline 
WA_P3542_STR-LGA16 sy-vline 
WA_P3542_STR-BET16 sy-vline 
WA_P3542_STR-LGA17 sy-vline 
WA_P3542_STR-BET17 sy-vline 
WA_P3542_STR-LGA18 sy-vline 
WA_P3542_STR-BET18 sy-vline 
WA_P3542_STR-LGA19 sy-vline 
WA_P3542_STR-BET19 sy-vline 
WA_P3542_STR-LGA20 sy-vline 
WA_P3542_STR-BET20 sy-vline 
WA_P3542_STR-LGA21 sy-vline 
WA_P3542_STR-BET21 sy-vline 
WA_P3542_STR-LGA22 sy-vline 
WA_P3542_STR-BET22 sy-vline 
WA_P3542_STR-LGA23 sy-vline 
WA_P3542_STR-BET23 sy-vline 
WA_P3542_STR-LGA24 sy-vline 
WA_P3542_STR-BET24 sy-vline 
WA_P3542_STR-LGA25 sy-vline 
WA_P3542_STR-BET25 sy-vline 
WA_P3542_STR-LGA26 sy-vline 
WA_P3542_STR-BET26 sy-vline 
WA_P3542_STR-LGA27 sy-vline 
WA_P3542_STR-BET27 sy-vline 
WA_P3542_STR-LGA28 sy-vline 
WA_P3542_STR-BET28 sy-vline 
WA_P3542_STR-LGA29 sy-vline 
WA_P3542_STR-BET29 sy-vline 
WA_P3542_STR-LGA30 sy-vline 
WA_P3542_STR-BET30 sy-vline 
WA_P3542_STR-LGA31 sy-vline 
WA_P3542_STR-BET31 sy-vline 
WA_P3542_STR-LGA32 sy-vline 
WA_P3542_STR-BET32 sy-vline 
WA_P3542_STR-LGA33 sy-vline 
WA_P3542_STR-BET33 sy-vline 
WA_P3542_STR-LGA34 sy-vline 
WA_P3542_STR-BET34 sy-vline 
WA_P3542_STR-LGA35 sy-vline 
WA_P3542_STR-BET35 sy-vline 
WA_P3542_STR-LGA36 sy-vline 
WA_P3542_STR-BET36 sy-vline 
WA_P3542_STR-LGA37 sy-vline 
WA_P3542_STR-BET37 sy-vline 
WA_P3542_STR-LGA38 sy-vline 
WA_P3542_STR-BET38 sy-vline 
WA_P3542_STR-LGA39 sy-vline 
WA_P3542_STR-BET39 sy-vline 
WA_P3542_STR-LGA40 sy-vline 
WA_P3542_STR-BET40 sy-vline 
WA_P3542_STR-LGA41 sy-vline 
WA_P3542_STR-BET41 sy-vline 
WA_P3542_STR-LGA42 sy-vline 
WA_P3542_STR-BET42 sy-vline 
WA_P3542_STR-LGA43 sy-vline 
WA_P3542_STR-BET43 sy-vline 
WA_P3542_STR-LGA44 sy-vline 
WA_P3542_STR-BET44 sy-vline 
WA_P3542_STR-LGA45 sy-vline 
WA_P3542_STR-BET45 sy-vline 
WA_P3542_STR-OPTYP sy-vline 
WA_P3542_STR-RPTYP sy-vline 
WA_P3542_STR-EXTAX sy-vline      INTO ld_text SEPARATED BY SPACE.

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