ABAP Select data from SAP table PPMGAG_S_ASSGN_LINK into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM PPMGAG_S_ASSGN_LINK
*  INTO TABLE @DATA(IT_PPMGAG_S_ASSGN_LINK2).
*--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_PPMGAG_S_ASSGN_LINK INDEX 1 INTO DATA(WA_PPMGAG_S_ASSGN_LINK2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<PPMGAG_S_ASSGN_LINK>-DOCNUMBER = 1.
<PPMGAG_S_ASSGN_LINK>-PREPAYMENTAGRMTLINKTYPE = 1.
<PPMGAG_S_ASSGN_LINK>-PREPAYMENTAGRMTREFBUSOBJECT = 1.
<PPMGAG_S_ASSGN_LINK>-PREPAYMENTAGRMTREFDOCUMENT = 1.
<PPMGAG_S_ASSGN_LINK>-PREPAYMENTAGRMTREFDOCITEM = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_PPMGAG_S_ASSGN_LINK-PREPAYMENTAGRMTLINKAMOUNT, sy-vline,
  WA_PPMGAG_S_ASSGN_LINK-PREPAYMENTAGREEMENTCURRENCY, sy-vline,
  WA_PPMGAG_S_ASSGN_LINK-PRECEDINGDOCTYPE, sy-vline,
  WA_PPMGAG_S_ASSGN_LINK-PRECEDINGDOCUMENT, sy-vline,
  WA_PPMGAG_S_ASSGN_LINK-PRECEDINGDOCITEM, sy-vline,
  WA_PPMGAG_S_ASSGN_LINK-PREPAYAGRMTVALIDFROMDATETIME, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_PPMGAG_S_ASSGN_LINK 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_PPMGAG_S_ASSGN_LINK 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_PPMGAG_S_ASSGN_LINK INTO WA_PPMGAG_S_ASSGN_LINK.


*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.

*Conversion exit ALPHA, internal->external for field DOCNUMBER
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_PPMGAG_S_ASSGN_LINK-DOCNUMBER
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_PPMGAG_S_ASSGN_LINK-DOCNUMBER.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field PREPAYMENTAGRMTREFDOCUMENT
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_PPMGAG_S_ASSGN_LINK-PREPAYMENTAGRMTREFDOCUMENT
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_PPMGAG_S_ASSGN_LINK-PREPAYMENTAGRMTREFDOCUMENT.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field PRECEDINGDOCUMENT
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_PPMGAG_S_ASSGN_LINK-PRECEDINGDOCUMENT
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_PPMGAG_S_ASSGN_LINK-PRECEDINGDOCUMENT.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field PRECEDINGDOCUMENT_EV
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_PPMGAG_S_ASSGN_LINK-PRECEDINGDOCUMENT_EV
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_PPMGAG_S_ASSGN_LINK-PRECEDINGDOCUMENT_EV.
WRITE:/ 'New Value:', ld_input.
ENDFORM. 

*&---------------------------------------------------------------------*
*& Form process_as_string_field_values
*&---------------------------------------------------------------------*
FORM process_as_string_field_values CHANGING p_EKKO LIKE wa_EKKO.

TYPES: BEGIN OF T_PPMGAG_S_ASSGN_LINK_STR, 
DOCNUMBER TYPE STRING,
PREPAYMENTAGRMTLINKTYPE TYPE STRING,
PREPAYMENTAGRMTREFBUSOBJECT TYPE STRING,
PREPAYMENTAGRMTREFDOCUMENT TYPE STRING,
PREPAYMENTAGRMTREFDOCITEM TYPE STRING,
PREPAYMENTAGRMTLINKAMOUNT TYPE STRING,
PREPAYMENTAGREEMENTCURRENCY TYPE STRING,
PRECEDINGDOCTYPE TYPE STRING,
PRECEDINGDOCUMENT TYPE STRING,
PRECEDINGDOCITEM TYPE STRING,
PREPAYAGRMTVALIDFROMDATETIME TYPE STRING,
PRECEDINGDOCTYPE_EV TYPE STRING,
PRECEDINGDOCUMENT_EV TYPE STRING,
PRECEDINGDOCITEM_EV TYPE STRING,END OF T_EKKO_STR.
DATA: WA_PPMGAG_S_ASSGN_LINK_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_PPMGAG_S_ASSGN_LINK_STR-DOCNUMBER sy-vline 
WA_PPMGAG_S_ASSGN_LINK_STR-PREPAYMENTAGRMTLINKTYPE sy-vline 
WA_PPMGAG_S_ASSGN_LINK_STR-PREPAYMENTAGRMTREFBUSOBJECT sy-vline 
WA_PPMGAG_S_ASSGN_LINK_STR-PREPAYMENTAGRMTREFDOCUMENT sy-vline 
WA_PPMGAG_S_ASSGN_LINK_STR-PREPAYMENTAGRMTREFDOCITEM sy-vline 
WA_PPMGAG_S_ASSGN_LINK_STR-PREPAYMENTAGRMTLINKAMOUNT sy-vline 
WA_PPMGAG_S_ASSGN_LINK_STR-PREPAYMENTAGREEMENTCURRENCY sy-vline 
WA_PPMGAG_S_ASSGN_LINK_STR-PRECEDINGDOCTYPE sy-vline 
WA_PPMGAG_S_ASSGN_LINK_STR-PRECEDINGDOCUMENT sy-vline 
WA_PPMGAG_S_ASSGN_LINK_STR-PRECEDINGDOCITEM sy-vline 
WA_PPMGAG_S_ASSGN_LINK_STR-PREPAYAGRMTVALIDFROMDATETIME sy-vline 
WA_PPMGAG_S_ASSGN_LINK_STR-PRECEDINGDOCTYPE_EV sy-vline 
WA_PPMGAG_S_ASSGN_LINK_STR-PRECEDINGDOCUMENT_EV sy-vline 
WA_PPMGAG_S_ASSGN_LINK_STR-PRECEDINGDOCITEM_EV sy-vline      INTO ld_text SEPARATED BY SPACE.

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