ABAP Select data from SAP table PMX20 into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP PMX20 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 PMX20. 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 PMX20 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_PMX20 TYPE STANDARD TABLE OF PMX20,
      WA_PMX20 TYPE PMX20,
      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: <PMX20> TYPE PMX20.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_PMX20.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM PMX20
  INTO TABLE IT_PMX20.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM PMX20
*  INTO TABLE @DATA(IT_PMX202).
*--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_PMX20 INDEX 1 INTO DATA(WA_PMX202).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_PMX20 ASSIGNING <PMX20>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<PMX20>-REPAT = 1.
<PMX20>-PERNR = 1.
<PMX20>-BEGDA = 1.
<PMX20>-FCAMB = 1.
<PMX20>-FEREP = 1.

ENDLOOP.

LOOP AT IT_PMX20 INTO WA_PMX20.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_PMX20-FERP1, sy-vline,
  WA_PMX20-FERP2, sy-vline,
  WA_PMX20-SEQNR, sy-vline,
  WA_PMX20-FEORI, sy-vline,
  WA_PMX20-AEDTM, sy-vline,
  WA_PMX20-UNAME, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_PMX20 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_PMX20 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_PMX20 INTO WA_PMX20.


*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 PDATE, internal->external for field FEC_NAC
CALL FUNCTION 'CONVERSION_EXIT_PDATE_OUTPUT'
  EXPORTING
    input =                      WA_PMX20-FEC_NAC
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_PMX20-FEC_NAC.
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_PMX20_STR, 
REPAT TYPE STRING,
PERNR TYPE STRING,
BEGDA TYPE STRING,
FCAMB TYPE STRING,
FEREP TYPE STRING,
FERP1 TYPE STRING,
FERP2 TYPE STRING,
SEQNR TYPE STRING,
FEORI TYPE STRING,
AEDTM TYPE STRING,
UNAME TYPE STRING,
INREP TYPE STRING,
SDIA TYPE STRING,
SDIFJ TYPE STRING,
SDIVR TYPE STRING,
SDIMX TYPE STRING,
WAERS TYPE STRING,
NUGUI TYPE STRING,
ENAME TYPE STRING,
NACHN TYPE STRING,
NACH2 TYPE STRING,
VORNA TYPE STRING,
GESCH TYPE STRING,
RFC TYPE STRING,
CURP TYPE STRING,
NIMSS TYPE STRING,
TIPCONT TYPE STRING,
SDIANT TYPE STRING,
SDI TYPE STRING,
TIPOSAL TYPE STRING,
NOMBRE_PADRE TYPE STRING,
NOMBRE_MADRE TYPE STRING,
LUG_NAC TYPE STRING,
FEC_NAC TYPE STRING,
DOM_TRAB1 TYPE STRING,
DOM_TRAB2 TYPE STRING,
JORSEMRED TYPE STRING,
TJRED TYPE STRING,
IJRED TYPE STRING,
JORED TYPE STRING,
PLSTX TYPE STRING,
REPLE TYPE STRING,
UNMED TYPE STRING,
REENTRY TYPE STRING,
REENTRY_GEN TYPE STRING,
MASSN TYPE STRING,
MASSG TYPE STRING,
NUCRI TYPE STRING,
FCRED TYPE STRING,
TDINF TYPE STRING,
VDESC TYPE STRING,END OF T_EKKO_STR.
DATA: WA_PMX20_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_PMX20_STR-REPAT sy-vline 
WA_PMX20_STR-PERNR sy-vline 
WA_PMX20_STR-BEGDA sy-vline 
WA_PMX20_STR-FCAMB sy-vline 
WA_PMX20_STR-FEREP sy-vline 
WA_PMX20_STR-FERP1 sy-vline 
WA_PMX20_STR-FERP2 sy-vline 
WA_PMX20_STR-SEQNR sy-vline 
WA_PMX20_STR-FEORI sy-vline 
WA_PMX20_STR-AEDTM sy-vline 
WA_PMX20_STR-UNAME sy-vline 
WA_PMX20_STR-INREP sy-vline 
WA_PMX20_STR-SDIA sy-vline 
WA_PMX20_STR-SDIFJ sy-vline 
WA_PMX20_STR-SDIVR sy-vline 
WA_PMX20_STR-SDIMX sy-vline 
WA_PMX20_STR-WAERS sy-vline 
WA_PMX20_STR-NUGUI sy-vline 
WA_PMX20_STR-ENAME sy-vline 
WA_PMX20_STR-NACHN sy-vline 
WA_PMX20_STR-NACH2 sy-vline 
WA_PMX20_STR-VORNA sy-vline 
WA_PMX20_STR-GESCH sy-vline 
WA_PMX20_STR-RFC sy-vline 
WA_PMX20_STR-CURP sy-vline 
WA_PMX20_STR-NIMSS sy-vline 
WA_PMX20_STR-TIPCONT sy-vline 
WA_PMX20_STR-SDIANT sy-vline 
WA_PMX20_STR-SDI sy-vline 
WA_PMX20_STR-TIPOSAL sy-vline 
WA_PMX20_STR-NOMBRE_PADRE sy-vline 
WA_PMX20_STR-NOMBRE_MADRE sy-vline 
WA_PMX20_STR-LUG_NAC sy-vline 
WA_PMX20_STR-FEC_NAC sy-vline 
WA_PMX20_STR-DOM_TRAB1 sy-vline 
WA_PMX20_STR-DOM_TRAB2 sy-vline 
WA_PMX20_STR-JORSEMRED sy-vline 
WA_PMX20_STR-TJRED sy-vline 
WA_PMX20_STR-IJRED sy-vline 
WA_PMX20_STR-JORED sy-vline 
WA_PMX20_STR-PLSTX sy-vline 
WA_PMX20_STR-REPLE sy-vline 
WA_PMX20_STR-UNMED sy-vline 
WA_PMX20_STR-REENTRY sy-vline 
WA_PMX20_STR-REENTRY_GEN sy-vline 
WA_PMX20_STR-MASSN sy-vline 
WA_PMX20_STR-MASSG sy-vline 
WA_PMX20_STR-NUCRI sy-vline 
WA_PMX20_STR-FCRED sy-vline 
WA_PMX20_STR-TDINF sy-vline 
WA_PMX20_STR-VDESC sy-vline      INTO ld_text SEPARATED BY SPACE.

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