ABAP Select data from SAP table PC29G into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP PC29G 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 PC29G. 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 PC29G 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_PC29G TYPE STANDARD TABLE OF PC29G,
      WA_PC29G TYPE PC29G,
      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: <PC29G> TYPE PC29G.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_PC29G.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM PC29G
  INTO TABLE IT_PC29G.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM PC29G
*  INTO TABLE @DATA(IT_PC29G2).
*--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_PC29G INDEX 1 INTO DATA(WA_PC29G2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_PC29G ASSIGNING <PC29G>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<PC29G>-IONUM = 1.
<PC29G>-OBJPS = 1.
<PC29G>-LGART = 1.
<PC29G>-RCAMT = 1.
<PC29G>-RCCAT = 1.

ENDLOOP.

LOOP AT IT_PC29G INTO WA_PC29G.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_PC29G-DBCOD, sy-vline,
  WA_PC29G-RCDAT, sy-vline,
  WA_PC29G-RCDRL, sy-vline,
  WA_PC29G-ADJNO, sy-vline,
  WA_PC29G-ABPAY, sy-vline,
  WA_PC29G-ACPRP, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_PC29G 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_PC29G 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_PC29G INTO WA_PC29G.


*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_PC29G_STR, 
IONUM TYPE STRING,
OBJPS TYPE STRING,
LGART TYPE STRING,
RCAMT TYPE STRING,
RCCAT TYPE STRING,
DBCOD TYPE STRING,
RCDAT TYPE STRING,
RCDRL TYPE STRING,
ADJNO TYPE STRING,
ABPAY TYPE STRING,
ACPRP TYPE STRING,
AMTOD TYPE STRING,
AYTOD TYPE STRING,
ATTOD TYPE STRING,
DMTDL TYPE STRING,
HISTORIC TYPE STRING,END OF T_EKKO_STR.
DATA: WA_PC29G_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_PC29G_STR-IONUM sy-vline 
WA_PC29G_STR-OBJPS sy-vline 
WA_PC29G_STR-LGART sy-vline 
WA_PC29G_STR-RCAMT sy-vline 
WA_PC29G_STR-RCCAT sy-vline 
WA_PC29G_STR-DBCOD sy-vline 
WA_PC29G_STR-RCDAT sy-vline 
WA_PC29G_STR-RCDRL sy-vline 
WA_PC29G_STR-ADJNO sy-vline 
WA_PC29G_STR-ABPAY sy-vline 
WA_PC29G_STR-ACPRP sy-vline 
WA_PC29G_STR-AMTOD sy-vline 
WA_PC29G_STR-AYTOD sy-vline 
WA_PC29G_STR-ATTOD sy-vline 
WA_PC29G_STR-DMTDL sy-vline 
WA_PC29G_STR-HISTORIC sy-vline      INTO ld_text SEPARATED BY SPACE.

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