ABAP Select data from SAP table PC20B into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP PC20B 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 PC20B. 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 PC20B 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_PC20B TYPE STANDARD TABLE OF PC20B,
      WA_PC20B TYPE PC20B,
      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: <PC20B> TYPE PC20B.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_PC20B.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM PC20B
  INTO TABLE IT_PC20B.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM PC20B
*  INTO TABLE @DATA(IT_PC20B2).
*--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_PC20B INDEX 1 INTO DATA(WA_PC20B2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_PC20B ASSIGNING <PC20B>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<PC20B>-C1ZNR = 1.
<PC20B>-EBUKR = 1.
<PC20B>-EWERK = 1.
<PC20B>-EGSBR = 1.
<PC20B>-EKKRS = 1.

ENDLOOP.

LOOP AT IT_PC20B INTO WA_PC20B.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_PC20B-EKOST, sy-vline,
  WA_PC20B-PROJN, sy-vline,
  WA_PC20B-AUFNR, sy-vline,
  WA_PC20B-LSTAR, sy-vline,
  WA_PC20B-SBUKR, sy-vline,
  WA_PC20B-SWERK, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_PC20B 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_PC20B 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_PC20B INTO WA_PC20B.


*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 EKOST
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_PC20B-EKOST
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_PC20B-EKOST.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field AUFNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_PC20B-AUFNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_PC20B-AUFNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field SKOST
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_PC20B-SKOST
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_PC20B-SKOST.
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_PC20B_STR, 
C1ZNR TYPE STRING,
EBUKR TYPE STRING,
EWERK TYPE STRING,
EGSBR TYPE STRING,
EKKRS TYPE STRING,
EKOST TYPE STRING,
PROJN TYPE STRING,
AUFNR TYPE STRING,
LSTAR TYPE STRING,
SBUKR TYPE STRING,
SWERK TYPE STRING,
SGSBR TYPE STRING,
SKKRS TYPE STRING,
SKOST TYPE STRING,
EXBEL TYPE STRING,
MWSLD TYPE STRING,
MWSKZ TYPE STRING,
EXUPD TYPE STRING,END OF T_EKKO_STR.
DATA: WA_PC20B_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_PC20B_STR-C1ZNR sy-vline 
WA_PC20B_STR-EBUKR sy-vline 
WA_PC20B_STR-EWERK sy-vline 
WA_PC20B_STR-EGSBR sy-vline 
WA_PC20B_STR-EKKRS sy-vline 
WA_PC20B_STR-EKOST sy-vline 
WA_PC20B_STR-PROJN sy-vline 
WA_PC20B_STR-AUFNR sy-vline 
WA_PC20B_STR-LSTAR sy-vline 
WA_PC20B_STR-SBUKR sy-vline 
WA_PC20B_STR-SWERK sy-vline 
WA_PC20B_STR-SGSBR sy-vline 
WA_PC20B_STR-SKKRS sy-vline 
WA_PC20B_STR-SKOST sy-vline 
WA_PC20B_STR-EXBEL sy-vline 
WA_PC20B_STR-MWSLD sy-vline 
WA_PC20B_STR-MWSKZ sy-vline 
WA_PC20B_STR-EXUPD sy-vline      INTO ld_text SEPARATED BY SPACE.

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