ABAP Select data from SAP table P1654 into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP P1654 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 P1654. 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 P1654 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_P1654 TYPE STANDARD TABLE OF P1654,
      WA_P1654 TYPE P1654,
      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: <P1654> TYPE P1654.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_P1654.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM P1654
  INTO TABLE IT_P1654.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM P1654
*  INTO TABLE @DATA(IT_P16542).
*--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_P1654 INDEX 1 INTO DATA(WA_P16542).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_P1654 ASSIGNING <P1654>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<P1654>-MANDT = 1.
<P1654>-PLVAR = 1.
<P1654>-OTYPE = 1.
<P1654>-OBJID = 1.
<P1654>-INFTY = 1.

ENDLOOP.

LOOP AT IT_P1654 INTO WA_P1654.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_P1654-SUBTY, sy-vline,
  WA_P1654-ISTAT, sy-vline,
  WA_P1654-PRIOX, sy-vline,
  WA_P1654-BEGDA, sy-vline,
  WA_P1654-ENDDA, sy-vline,
  WA_P1654-VARYF, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_P1654 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_P1654 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_P1654 INTO WA_P1654.


*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_P1654_STR, 
MANDT TYPE STRING,
PLVAR TYPE STRING,
OTYPE TYPE STRING,
OBJID TYPE STRING,
INFTY TYPE STRING,
SUBTY TYPE STRING,
ISTAT TYPE STRING,
PRIOX TYPE STRING,
BEGDA TYPE STRING,
ENDDA TYPE STRING,
VARYF TYPE STRING,
SEQNR TYPE STRING,
AEDTM TYPE STRING,
UNAME TYPE STRING,
REASN TYPE STRING,
HISTO TYPE STRING,
ITXNR TYPE STRING,
IDNUM TYPE STRING,
STATU TYPE STRING,
NATUR TYPE STRING,
TYPE TYPE STRING,
DECRE TYPE STRING,
DEMIS TYPE STRING,
DDIFF TYPE STRING,
DDEMA TYPE STRING,
DDECI TYPE STRING,
DGEST TYPE STRING,
ARCID TYPE STRING,
DVI01 TYPE STRING,
AVI01 TYPE STRING,
SVI01 TYPE STRING,
DVI02 TYPE STRING,
AVI02 TYPE STRING,
SVI02 TYPE STRING,
DVI03 TYPE STRING,
AVI03 TYPE STRING,
SVI03 TYPE STRING,
DVI04 TYPE STRING,
AVI04 TYPE STRING,
SVI04 TYPE STRING,
DVI05 TYPE STRING,
AVI05 TYPE STRING,
SVI05 TYPE STRING,
DVI06 TYPE STRING,
AVI06 TYPE STRING,
SVI06 TYPE STRING,
DVI07 TYPE STRING,
AVI07 TYPE STRING,
SVI07 TYPE STRING,
DVI08 TYPE STRING,
AVI08 TYPE STRING,
SVI08 TYPE STRING,
DVI09 TYPE STRING,
AVI09 TYPE STRING,
SVI09 TYPE STRING,
DVI10 TYPE STRING,
AVI10 TYPE STRING,
SVI10 TYPE STRING,
TABNR TYPE STRING,END OF T_EKKO_STR.
DATA: WA_P1654_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_P1654_STR-MANDT sy-vline 
WA_P1654_STR-PLVAR sy-vline 
WA_P1654_STR-OTYPE sy-vline 
WA_P1654_STR-OBJID sy-vline 
WA_P1654_STR-INFTY sy-vline 
WA_P1654_STR-SUBTY sy-vline 
WA_P1654_STR-ISTAT sy-vline 
WA_P1654_STR-PRIOX sy-vline 
WA_P1654_STR-BEGDA sy-vline 
WA_P1654_STR-ENDDA sy-vline 
WA_P1654_STR-VARYF sy-vline 
WA_P1654_STR-SEQNR sy-vline 
WA_P1654_STR-AEDTM sy-vline 
WA_P1654_STR-UNAME sy-vline 
WA_P1654_STR-REASN sy-vline 
WA_P1654_STR-HISTO sy-vline 
WA_P1654_STR-ITXNR sy-vline 
WA_P1654_STR-IDNUM sy-vline 
WA_P1654_STR-STATU sy-vline 
WA_P1654_STR-NATUR sy-vline 
WA_P1654_STR-TYPE sy-vline 
WA_P1654_STR-DECRE sy-vline 
WA_P1654_STR-DEMIS sy-vline 
WA_P1654_STR-DDIFF sy-vline 
WA_P1654_STR-DDEMA sy-vline 
WA_P1654_STR-DDECI sy-vline 
WA_P1654_STR-DGEST sy-vline 
WA_P1654_STR-ARCID sy-vline 
WA_P1654_STR-DVI01 sy-vline 
WA_P1654_STR-AVI01 sy-vline 
WA_P1654_STR-SVI01 sy-vline 
WA_P1654_STR-DVI02 sy-vline 
WA_P1654_STR-AVI02 sy-vline 
WA_P1654_STR-SVI02 sy-vline 
WA_P1654_STR-DVI03 sy-vline 
WA_P1654_STR-AVI03 sy-vline 
WA_P1654_STR-SVI03 sy-vline 
WA_P1654_STR-DVI04 sy-vline 
WA_P1654_STR-AVI04 sy-vline 
WA_P1654_STR-SVI04 sy-vline 
WA_P1654_STR-DVI05 sy-vline 
WA_P1654_STR-AVI05 sy-vline 
WA_P1654_STR-SVI05 sy-vline 
WA_P1654_STR-DVI06 sy-vline 
WA_P1654_STR-AVI06 sy-vline 
WA_P1654_STR-SVI06 sy-vline 
WA_P1654_STR-DVI07 sy-vline 
WA_P1654_STR-AVI07 sy-vline 
WA_P1654_STR-SVI07 sy-vline 
WA_P1654_STR-DVI08 sy-vline 
WA_P1654_STR-AVI08 sy-vline 
WA_P1654_STR-SVI08 sy-vline 
WA_P1654_STR-DVI09 sy-vline 
WA_P1654_STR-AVI09 sy-vline 
WA_P1654_STR-SVI09 sy-vline 
WA_P1654_STR-DVI10 sy-vline 
WA_P1654_STR-AVI10 sy-vline 
WA_P1654_STR-SVI10 sy-vline 
WA_P1654_STR-TABNR sy-vline      INTO ld_text SEPARATED BY SPACE.

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