ABAP Select data from SAP table PC2CH01 into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP PC2CH01 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 PC2CH01. 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 PC2CH01 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_PC2CH01 TYPE STANDARD TABLE OF PC2CH01,
      WA_PC2CH01 TYPE PC2CH01,
      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: <PC2CH01> TYPE PC2CH01.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_PC2CH01.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM PC2CH01
  INTO TABLE IT_PC2CH01.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM PC2CH01
*  INTO TABLE @DATA(IT_PC2CH012).
*--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_PC2CH01 INDEX 1 INTO DATA(WA_PC2CH012).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_PC2CH01 ASSIGNING <PC2CH01>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<PC2CH01>-LGART = 1.
<PC2CH01>-CNTR3 = 1.
<PC2CH01>-SUBTY = 1.
<PC2CH01>-SWNRE = 1.
<PC2CH01>-ETRNR = 1.

ENDLOOP.

LOOP AT IT_PC2CH01 INTO WA_PC2CH01.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_PC2CH01-ETRNZ, sy-vline,
  WA_PC2CH01-ETBEG, sy-vline,
  WA_PC2CH01-ETEND, sy-vline,
  WA_PC2CH01-ITBEG, sy-vline,
  WA_PC2CH01-ITEND, sy-vline,
  WA_PC2CH01-KDBSL, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_PC2CH01 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_PC2CH01 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_PC2CH01 INTO WA_PC2CH01.


*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_PC2CH01_STR, 
LGART TYPE STRING,
CNTR3 TYPE STRING,
SUBTY TYPE STRING,
SWNRE TYPE STRING,
ETRNR TYPE STRING,
ETRNZ TYPE STRING,
ETBEG TYPE STRING,
ETEND TYPE STRING,
ITBEG TYPE STRING,
ITEND TYPE STRING,
KDBSL TYPE STRING,
INTKY TYPE STRING,
LCOUN TYPE STRING,END OF T_EKKO_STR.
DATA: WA_PC2CH01_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_PC2CH01_STR-LGART sy-vline 
WA_PC2CH01_STR-CNTR3 sy-vline 
WA_PC2CH01_STR-SUBTY sy-vline 
WA_PC2CH01_STR-SWNRE sy-vline 
WA_PC2CH01_STR-ETRNR sy-vline 
WA_PC2CH01_STR-ETRNZ sy-vline 
WA_PC2CH01_STR-ETBEG sy-vline 
WA_PC2CH01_STR-ETEND sy-vline 
WA_PC2CH01_STR-ITBEG sy-vline 
WA_PC2CH01_STR-ITEND sy-vline 
WA_PC2CH01_STR-KDBSL sy-vline 
WA_PC2CH01_STR-INTKY sy-vline 
WA_PC2CH01_STR-LCOUN sy-vline      INTO ld_text SEPARATED BY SPACE.

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