ABAP Select data from SAP table PC20H into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP PC20H 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 PC20H. 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 PC20H 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_PC20H TYPE STANDARD TABLE OF PC20H,
      WA_PC20H TYPE PC20H,
      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: <PC20H> TYPE PC20H.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_PC20H.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM PC20H
  INTO TABLE IT_PC20H.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM PC20H
*  INTO TABLE @DATA(IT_PC20H2).
*--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_PC20H INDEX 1 INTO DATA(WA_PC20H2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_PC20H ASSIGNING <PC20H>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<PC20H>-DATUM = 1.
<PC20H>-BEGUZ = 1.
<PC20H>-ENDUZ = 1.
<PC20H>-ALZNR = 1.
<PC20H>-C1ZNR = 1.

ENDLOOP.

LOOP AT IT_PC20H INTO WA_PC20H.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_PC20H-V0TYP, sy-vline,
  WA_PC20H-V0ZNR, sy-vline,
  WA_PC20H-VTKEN, sy-vline,
  WA_PC20H-LGART, sy-vline,
  WA_PC20H-KENN1, sy-vline,
  WA_PC20H-ZEINH, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_PC20H 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_PC20H 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_PC20H INTO WA_PC20H.


*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_PC20H_STR, 
DATUM TYPE STRING,
BEGUZ TYPE STRING,
ENDUZ TYPE STRING,
ALZNR TYPE STRING,
C1ZNR TYPE STRING,
V0TYP TYPE STRING,
V0ZNR TYPE STRING,
VTKEN TYPE STRING,
LGART TYPE STRING,
KENN1 TYPE STRING,
ZEINH TYPE STRING,
ANZHL TYPE STRING,
BETPE TYPE STRING,
BETRG TYPE STRING,END OF T_EKKO_STR.
DATA: WA_PC20H_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_PC20H_STR-DATUM sy-vline 
WA_PC20H_STR-BEGUZ sy-vline 
WA_PC20H_STR-ENDUZ sy-vline 
WA_PC20H_STR-ALZNR sy-vline 
WA_PC20H_STR-C1ZNR sy-vline 
WA_PC20H_STR-V0TYP sy-vline 
WA_PC20H_STR-V0ZNR sy-vline 
WA_PC20H_STR-VTKEN sy-vline 
WA_PC20H_STR-LGART sy-vline 
WA_PC20H_STR-KENN1 sy-vline 
WA_PC20H_STR-ZEINH sy-vline 
WA_PC20H_STR-ANZHL sy-vline 
WA_PC20H_STR-BETPE sy-vline 
WA_PC20H_STR-BETRG sy-vline      INTO ld_text SEPARATED BY SPACE.

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